Data Sets

Study area

CLPX Study Area Map. See high-resolution map. Map courtesy of NSIDC.

The CLPX Data Set Table below lists both unrestricted and restricted CLPX data sets. If you have problems accessing data or have questions, please contact NSIDC User Services.

For more information regarding the Cold Land Process Field Experiment (CLPX), please see the CLPX Overview page.

CLPX Data Sets

Title Spatial Coverage Temporal Coverage Spatial Resolution Temporal Resolution Parameter(s)

CLPX Airborne Gamma Snow and Soil Moisture Surveys, Version 1

Dataset Summary

Airborne gamma surveys were conducted over each of the three Cold Land Processes Field Experiment (CLPX) Meso-cell Study Areas (MSAs) in northern Colorado, USA, during September 2001 and 2002, and during the three Intensive Observation Periods (IOPs) in February 2002 (IOP1), February 2003 (IOP3) and March 2003 (IOP4). Data collected in September 2001 and 2002 provided background gamma radiation measurements necessary to calculate measurements of snow water equivalent (SWE) and soil moisture during subsequent winters. Airborne gamma radiation measurements of SWE and soil moisture are based on the attenuation of natural terrestrial gamma radiation by the mass of water contained in the soil and snow. Measurements were collected at 500 feet AGL along flight lines of variable length and 300 m width. Measurements are integrated along the entire length of a flight line. Flight lines in the North Park MSA were each 9 km in length, with a series of three lines (27 km total length) flown in a regular N-S parallel pattern spaced 1 km apart. Flight lines in the Fraser and Rabbit Ears MSAs are of variable length and direction.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 41, S: 39.5, E: -105, W: -107.5

2001/09/20 to 2001/09/22, 2002/02/19 to 2002/02/23, 2002/09/17, 2003/02/19 to 2003/02/21, 2003/03/25 to 2003/03/31 Snow Cover, Snow Water Equivalent, Soil Moisture/Water Content

CLPX Airborne: Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) Data, Version 1

Dataset Summary

This data set consists of apparent surface reflectance, subpixel snow-covered area and grain size inferred from data acquired by the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS). The AVIRIS has a spectral range of 400-2500 nm, a spectral resolution of 10 nm, instantaneous field of view of 1 mrad, and a scan angle of 15 degrees. Sampling is scene based (~ 815 samples, 512 lines).

The AVIRIS provides spectral resolution into hundreds of spectral bands versus the seven multispectral bands flown on traditional Landsat imaging missions. Through this large number of spectral bands, complex land ecosystems can be imaged and accurately classified.

This data set is part of the NASA Cold Land Processes Field Experiment (CLPX). The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread. Data are available via FTP. Users are requested to register with NSIDC User Services to obtain access to the data.

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N: 41, S: 39.7, E: -105.5, W: -107

2002/02/19 to 2002/02/20, 2002/03/25 to 2002/04/01, 2002/04/04 to 2002/04/08 Snow Cover, Reflectance

CLPX NCAR Data Analysis and Numerical Modeling, Version 1

Dataset Summary

The purpose of this project was to generate a research-quality, scientifically-sound, best-as-reasonably possible, three-dimensional meteorological analysis for the entire cold season 2002-2003 for the three CLPX Meteorological Study Areas (MSAs) in northern Colorado (North Park, Fraser
and Rabbit Ears) using high-resolution (500 m horizontal grid spacing). This
complex terrain meteorological dataset is to be used to complete publishable
research from CLPX across the disciplines of atmospheric science, snow
science, ecology and forestry. All simulations were completed through the
provision of supercomputer time at the National Center for Atmospheric
Research. Data are available via FTP.

The NASA Cold Land Processes Field Experiment (CLPX) is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1 ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 42, S: 38.5, E: -104, W: -108.5

2001/10/01 to 2003/06/30 Air Temperature, Surface Winds

CLPX NOAA FSL Rapid Update Cycle 20 km (RUC-20) Dataset, Version 1

Dataset Summary

The Rapid Update Cycle analysis/model system at a 20-km horizontal resolution (RUC20) provides short-range numerical weather guidance for general forecasting, as well as for the special short-term needs of aviation and severe-weather forecasting. This data set consists of 60 meteorological and soil parameters at 50 computational levels. Data are available from 1 October 2002 to 1 October 2003. RUC20 is a further development on the RUC40 model that produced output at a 40 km horizontal resolution.

The NASA Cold Land Processes Experiment (CLPX) is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 54, S: 24, E: 66, W: -126

2002/09/30 to 2003/09/30 Air Temperature, Albedo, Geopotential Height, Longwave Radiation, Incoming Solar Radiation, Heat Flux, Outgoing Longwave Radiation, Shortwave Radiation, Precipitation Amount, Runoff, Sea Level Pressure, Snow, Snow Melt, Land Heat Capacity, Soil Moisture/Water Content, Soil Temperature, Humidity, Surface Air Temperature, Surface Winds, Upper Level Winds

CLPX-Airborne: Airborne Synthetic Aperture Radar (AIRSAR) Imagery, Version 1

Dataset Summary

Airborne Synthetic Aperture Radar (AIRSAR) is a side-looking imaging radar that is able to collect data irrespective of daylight or cloud cover. The AIRSAR instrument was operated in two modes over each Cold Land Processes Field Experiment (CLPX) Meso-cell Study Area (MSA). In the first mode (POLSAR), polarimetric radar data were collected at P-, L-, and C-bands. In the second mode (TOPSAR), cross-track interferometry data were collected at C-band and L-band. The CLPX AIRSAR mission flew on a DC-8 aircraft at 8 km altitude over the three MSAs at Rabbit Ears, North Park, and Fraser. 171 flight lines (87 TOPSAR and 84 POLSAR) were flown in February, March, and September of 2002 and in March 2003.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 40.7, S: 39.9, E: -105.9, W: -106.7

2002/02/19 to 2002/02/24, 2002/03/25, 2002/09/17, 2003/03/25 to 2003/03/30 Radar Imagery

CLPX-Airborne: Infrared Orthophotography and Lidar Topographic Mapping, Version 1

Dataset Summary

This data set was collected to test the concept of measuring snow depth using aerial lidar. The data set consists of color infrared orthophotography (TerrainVision® - High resolution Topographic Mapping & Aerial Photography, with 6-inch pixel resolution), lidar elevation returns (raw/combined, filtered to bare ground/snow, and filtered to top of vegetation), elevation contours (0.5 meter) and snow depth contours (0.1 meter). Data were collected within the Small Regional Study Area (SRSA) as part of the Cold Land Processes Field Experiment (CLPX) in Northern Colorado. Observations were made in each Intensive Study Area (ISA), the Local Scale Observation Site (LSOS) and at a site adjacent to the NCAR (National Center for Atmospheric Research) flux tower (close to the southeast corner of Potter Creek ISA). Data were collected on 8-9 April and 18-19 September 2003. Data are available for all sites except for snow depth contours at the site adjacent to the NCAR flux tower. Elevation data were acquired at approximately 4200 ft via Airborne lidar, normalized to ground controls and processed to remove noise and redundancies.

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N: 41, S: 39.5, E: -105, W: -107.5

2003/09/18 to 2003/09/19, 2003/04/08 to 2003/04/09 Landforms, Contours, Terrain Elevation

CLPX-Airborne: Micrometeorological Measurements Over Snow, Airborne, Version 1

Dataset Summary

This data set presents micrometeorological data from the Flux over Snow Surfaces (FLOSS) project carried out during the Cold Land Processes Field Experiment (CLPX) at North Park, Colorado, USA. The project measured air temperature, air pressure, relative humidity, water vapor, cloud particles, carbon dioxide, longwave and shortwave radiation, and precipitation. Measurements were collected between November 2002 and March 2003. Sensors were installed on a Raytheon King Air 200T, which flew at low atlitude over the study area.

Details

2002/11/01 to 2003/03/31 Air Temperature, Atmospheric Pressure Measurements, Carbon and Hydrocarbon Compounds, Humidity, Longwave Radiation, Net Radiation, Outgoing Longwave Radiation, Precipitation Amount, Shortwave Radiation, Water Vapor Profiles

CLPX-Airborne: Multiband Polarimetric Scanning Radiometer (PSR) Imagery, Version 1

Dataset Summary

This data set provides multiband polarimetric brightness temperature images over three 25 x 25 km Meso-cell Study Areas (MSAs) in Northern Colorado. The purpose of collecting these data within the overall aims of the NASA Cold Land Processes Field Experiment (CLPX) is to 1) provide multiband polarimetric dry snow microwave images using AMSR-E bands at a spatial resolution representative of the topography and vegetation cover, and 2) provide a simulated AMSR-E microwave data set coincident with the CLPX AIRSAR imagery for joint snow algorithm retrieval studies. Data were collected using the NOAA Environmental Technology Laboratory (ETL) Polarimetric Scanning Radiometer (PSR), an airborne multiband, conical-scanning, imaging radiometer system. PSR/A data were collected from a series of flight lines flown over the MSAs in February and March 2002 and 2003. PSR/A data are available via FTP as binary files (*.bin) and MATLAB files (*.mat).

NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations were collected. Data collection focused on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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2003/03/25 to 2003/03/31, 2003/02/22 to 2003/02/25, 2002/02/19 to 2002/02/21 Brightness Temperature, Microwave Imagery, Snow Cover

CLPX-Airborne: Polarimetric Ku-Band Scatterometer (POLSCAT) Data, Version 1

Dataset Summary

This data set contains Ku-band polarimetric scatterometer (POLSCAT) data collected as part of the Cold Land Processes Field Experiment (CLPX) to enable the development of a retrieval algorithm for snow water equivalent (SWE). POLSCAT is a Ku-band polarimetric scatterometer operating at 13.95 GHz. Flights were flown on 19, 21, and 23 February 2002 (during IOP1), 25 March 2002 (IOP2), and 25, 28 and 30 March 2003 (IOP 4). 205 flight lines of data were collected over Fraser, North Park and Rabbit Ears MSAs.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 40.56667, S: 40.34167, E: -106.54167, W: -106.81694

2002/02/21, 2002/02/23, 2002/03/25, 2003/03/25, 2003/03/28, 2003/03/30 Radar Backscatter

CLPX-Ground: Ground Based Passive Microwave Radiometer (GBMR-7) Data, Version 1

Dataset Summary

This data set contains brightness temperature observations of the snow cover at the Local Scale Observation Site (LSOS) of the Cold Land Processes Field Experiment (CLPX) in Fraser, Colorado, USA. Measurements were taken at 18.7, 23.8, 36.5, and 89 GHz (vertical/horizontal polarization) using a ground-based passive microwave radiometer (GBMR-7). Three different measurement techniques were used: 1) scans of undisturbed total snow cover, 2) angular scans with varying incidence angles (30 to 70 degrees), and 3) scans of bare soil and new snow accumulation. In addition to observed snow brightness temperatures, the data set includes snow pit characteristics (density, snow temperature, stratigraphy, snow crystal size, soil moisture) and meteorological forcing data observations (wind speed, wind direction, air temperature, relative humidity, downward long-wave radiation, downward short-wave radiation and precipitation). Snow cover brightness measurements were made 19-21 January 2002, 10-13 December 2002, 18-26 February 2003 and 25 March 2003. Snow pit and meteorological measurements were made between 1 October 2002 and 29 March 2003.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.95, S: 39.95, E: -105.9, W: -105.9

2003/03/25, 2003/02/18 to 2003/02/26, 2002/12/10 to 2002/12/13, 2002/10/01 to 2003/03/29, 2002/01/19 to 2002/01/21 Air Temperature, Brightness Temperature, Humidity, Incoming Solar Radiation, Longwave Radiation, Precipitation Amount, Shortwave Radiation, Snow, Snow Cover, Snow Density, Snow Depth, Snow/Ice Temperature, Snow Melt, Snow Stratigraphy, Snow Water Equivalent, Soil Moisture/Water Content, Surface Winds

CLPX-Ground: Ground-Based Frequency Modulated Continuous Wave (FMCW) Radar, Version 1

Dataset Summary

This data set is comprised of FMCW radar measurements, which are sensitive to electromagnetic discontinuities in the snowpack, made during the 2002 and 2003 Cold Land Processes Field Experiment (CLPX). The microwave interaction with a snow pack was measured using broadband frequency modulated continuous wave (FMCW) radar operating at between 2 and 18 GHz, incorporating the following frequencies: C-Band (2-6 GHz), X-Band (8-12 GHz), and Ku-Band (14-18 GHz). Measurements were made at the Local Scale Observation Site (LSOS) near Fraser, Colorado, during Intensive Observation Periods (IOP) 1 and 2 (February and March, 2002), and at four different sites covering each of the three Mesocell Study Areas (MSAs) during IOP 3 and 4 (February and March, 2003). Active microwave radar signals are reflected and scattered by electromagnetic discontinuities that affect radar backscatter signatures. The location and magnitude of these discontinuities in a snow pack must be identified as a function of microwave frequency in order to accurately invert snow cover properties from active and passive microwave remote sensing systems. Consequently, in conjunction with the radar measurements, detailed snow pit measurements were taken at a nearby site in order to correlate the radar profile with the snow pit records.

This investigation found that radar operating at 14-18 GHz contains the most information about the internal features of a dry snow pack. However, the high-frequency radar is of limited use in wet snow due to the high absorption loss in water. For a wet snowpack, radar operating at lower frequencies (2-6 GHz) was necessary for penetrating to the snow-ground interface. These findings suggest that a dual-frequency approach for radar remote sensing may be necessary to retrieve snow pack parameters such as density, depth, and wetness.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 40.6449, S: 39.828, E: -105.7681, W: -106.6788

2003/02/19 to 2003/03/29, 2002/02/19 to 2002/03/26 Radar Reflectivity, Snow Cover, Snow Depth

CLPX-Ground: Ground-Based Infrared Images of the LSOS Site, Version 1

Dataset Summary

This data set presents more than 400 sub-canopy digital thermograms collected at the Fraser Experimental Forest (Fraser, Colorado, USA) using an Infrared Solutions IR SnapShot™ thermoelectric thermal infrared (IR) imaging radiometer that was cold-weather modified. To view the data it is necessary to have the Infrared Solutions SnapView™ software, which is available from Infrared Solutions.

The NASA Cold Land Processes Field Experiment (CLPX) is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1 ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.9066, S: 39.9066, E: -105.8829, W: -105.8829

2003/03/26 to 2003/03/30, 2002/03/28 to 2002/03/30, 2002/02/18 to 2002/02/22 Albedo, Canopy Characteristics, Infrared Imagery, Infrared Radiance, Longwave Radiation, Net Radiation, Outgoing Longwave Radiation, Shortwave Radiation, Thermal Infrared

CLPX-Ground: Ground-based L and Ku band polarimetric scatterometry, Version 1

Dataset Summary

This data set includes ground-based radar observations carried out at the Fraser Experimental Forest Headquarters, Colorado, USA (39.95 N, 105.9 W), between 17-26 February and 26-30 March 2003. Truck-mounted L- and Ku-band scatterometers were used to collect fully polarimetric backscattering coefficients of snow. The calibrated radar systems measured the amplitude and phase of backscattered signal over a relatively wide bandwidth at L-band (1.1-1.4 GHz) and Ku-band (15.25-15.75 GHz). Backscatter measurements of an open snow pack were collected at three different incidence angles (20, 35, and 50 degrees) several times a day. This data set is part of the NASA Cold Land Processes Field Experiment (CLPX).

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.95, S: 39.95, E: -105.9, W: -105.9

2003/02/17 to 2003/02/26, 2003/03/26 to 2003/03/30 Microwave Radiance, Radar Backscatter, Return Power, Snow, Snow Cover, Snow Depth

CLPX-Ground: ISA Corner Site Meteorological Data, Version 1

Dataset Summary

This data set contains meteorological observations at 36 sites throughout the Small Regional Study Area (SRSA) of the NASA Cold Land Processes Field Experiment (CLPX) in Colorado, USA. Identical meteorological towers were located close to the four corners of nine 1 km x 1 km Intensive Study Areas (ISAs). At each site, measurements of air temperature, relative humidity, wind speed, and wind direction were made at 2 m (North Park) or 4 m (Frasier and Buffalo Pass) above ground level. Snow depth, soil moisture, and soil temperatures were also measured. Hourly meteorological observations were recorded between 20 September 2002 and 1 October 2003, although data were not necessarily continuous throughout this time period for all towers.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km^2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry; and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 41, S: 39.5, E: -105, W: -107.5

2002/09/01 to 2003/10/31 Air Temperature, Humidity, Snow Depth, Soil Moisture/Water Content, Soil Temperature, Surface Winds

CLPX-Ground: ISA Main Meteorological Data, Version 1

Dataset Summary

This data set contains meteorological observations at ten sites throughout the Small Regional Study Area (SRSA) of the Cold Land Processes Field Experiment (CLPX) in Fraser, Colorado, USA. Nine identical meteorological towers were located close to the center of each Intensive Study Area (ISA). Another meteorological tower was located close to the Local-Scale Observation Site (LSOS) within the Fraser Meso-Cell Study Area (MSA). At each site, measurements were made at 10 m above ground level (air temperature, relative humidity, radiation, leaf wetness, wind speed, and direction); approximately 1 m above maximum anticipated snow depth (air temperature, relative humidity, wind speed, wind direction and, in the North Park MSA only, precipitation); and snow depth, snow surface temperature, snow temperature profile, soil moisture, and soil temperatures. Snow pits were also dug at the meteorological sites, and snow density, temperature, and stratigraphy were recorded. Meteorological observations were recorded at a 10-minute temporal resolution between 20 September 2002 and 1 October 2003, although data were not necessarily continuous throughout this time period for all towers. Meteorological measurements were made to support investigations of spatial and temporal variations in accumulation and ablation of the seasonal snowpack within the study areas.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 41, S: 39.5, E: -105, W: -107.5

2002/09/20 to 2003/10/01 Air Temperature, Atmospheric Pressure Measurements, Boundary Layer Winds, Longwave Radiation, Net Radiation, Precipitation Amount, Humidity, Shortwave Radiation, Skin Temperature, Snow Density, Snow Depth, Snow/Ice Chemistry, Snow/Ice Temperature, Snow Stratigraphy, Snow Cover, Snow Water Equivalent, Soil Moisture/Water Content, Soil Temperature, Surface Roughness

CLPX-Ground: ISA Snow Depth Transects and Related Measurements, Version 2

Dataset Summary

This data set consists of snow depth data from nine study areas, within
three larger-scale areas in northern Colorado (Fraser, North Park, and
Rabbit Ears Meso-cell Study Areas (MSAs)). The study areas range from low-relief (flat topography)
unforested areas with shallow snow covers, to high-relief (complex topography)
densely forested areas with deep snow covers. Parameters measured include
snow depth, snow wetness, snow temperature, soil temperature, and canopy cover. Photos were taken of
surface roughness and terrain. Data were collected during February and March 2002 and 2003. This data
set is part of the NASA Cold Land Processes Field Experiment (CLPX).

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N: 42, S: 38.5, E: -104, W: -108.5

2002/02/19 to 2002/02/23 Canopy Characteristics, Snow Cover, Snow Depth, Soil Temperature, Surface Roughness

CLPX-Ground: ISA Snow Pit Measurements, Version 2

Dataset Summary

This data set consists of snow pit data from nine study areas, within three larger-scale areas in northern
Colorado (Fraser, North Park, and Rabbit
Ears Meso-cell Study Areas (MSAs)). The study areas range from low-relief (flat topography)
unforested areas with shallow snow covers, to high-relief (complex topography) densely forested areas
with deep snow covers. Parameters
measured include snow density, snow temperature, snow stratigraphy, and
snow grain size. Data were collected during February
and March 2002 and 2003. This data set is part of the NASA Cold Land Processes Field Experiment (CLPX).

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N: 42, S: 38.5, E: -104, W: -108.5

2002/02/19 to 2002/03/30 Snow Density, Snow Depth, Snow/Ice Chemistry, Snow/Ice Temperature, Snow Stratigraphy, Snow Water Equivalent, Surface Roughness

CLPX-Ground: ISA Soil Moisture Measurements, Version 1

Dataset Summary

This data set consists of in-situ point measurements of soil moisture within three 25-km by 25-km Meso-cell Study Areas (MSAs) in northern Colorado (Fraser, North Park , and Rabbit Ears). Measurements were made between September 2001 and April 2003. Spatial and temporal variations in soil moisture described by these data may be used to support remotely sensed airborne (e.g., Gamma flights) and satellite (e.g., AMSR-E) surveys of soil moisture at increasing spatial scales. Gravimetric measurements, as well as some volumetric measurements, of soil moisture were made at each measurement site.

The NASA Cold Land Processes Field Experiment (CLPX) is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 40.6, S: 40.375, E: -106.2, W: -106.8

2001/09/01 to 2003/04/30 Soil Moisture/Water Content

CLPX-Ground: Micrometeorological Data at the Local Scale Observation Site (LSOS), Version 1

Dataset Summary

This data set includes two sets of soil temperature profiles, two sets of soil moisture profiles, two sets of soil heat flux profiles (in dense pine and open pine areas), and one set of a snow temperature profile, air temperature, and relative humidity measurements. Measurements were made at the Local Scale Observation Site (LSOS) of the Cold Land Processes Field Experiment (CLPX) in northern Colorado. The LSOS is a 100 m x 100 m study site located within the Fraser Intensive Study Area (ISA). The study area has flat topography with a uniform pine forest, a discontinuous pine forest, and a small clearing. Data were collected between
6 November 2002 and 29 May 2003. These data were primarily collected to support the University of Michigan microwave radiometric observations acquired at the same site (to be published in early 2004).

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N: 39.90661, S: 0, E: 0, W: -105.88294

2002/11/06 to 2003/05/29 Heat Flux, Humidity, Snow/Ice Temperature, Soil Heat Budget, Soil Moisture/Water Content, Soil Temperature, Surface Air Temperature

CLPX-Ground: Micrometeorological Measurements Over Snow, Ground-Based, Version 1

Dataset Summary

This data set presents micrometeorological data from the Flux over Snow Surfaces (FLOSS) project carried out during the Cold Land Processes Field Experiment (CLPX) at North Park, Colorado, USA. The project measured air temperature, air pressure, relative humidity, wind speed, water vapor flux, carbon dioxide, longwave and shortwave radiation, soil temperature, soil moisture, soil heat flux, precipitation, snow depth, and eddy correlation. Measurements were collected between 1 Dec 2001 and 27 March 2002, and between 20 November 2002 and 24 March 2003. Sensors were installed on 2-meter and 4-meter platforms.

Details

2001/12/01 to 2002/03/27, 2002/11/20 to 2003/03/24 Air Temperature, Atmospheric Pressure Measurements, Carbon and Hydrocarbon Compounds, Humidity, Longwave Radiation, Net Radiation, Outgoing Longwave Radiation, Precipitation Amount, Precipitation Rate, Shortwave Radiation, Snow Depth, Soil Heat Budget, Soil Moisture/Water Content, Soil Temperature, Surface Air Temperature, Surface Pressure, Surface Winds, Wind Profiles

CLPX-Ground: Micrometeorological Measurements Over Snow, Tower Mounted, Version 1

Dataset Summary

This data set presents micrometeorological data from the Flux over Snow Surfaces (FLOSS) project carried out during the Cold Land Processes Field Experiment (CLPX) at North Park, Colorado, USA. The project measured air temperature, air pressure, relative humidity, wind speed, water vapor flux, carbon dioxide, longwave and shortwave radiation, soil temperature, soil moisture, soil heat flux, precipitation, snow depth, and eddy correlation. Measurements were collected between 1 Dec 2001 and 27 March 2002, and between 20 November 2002 and 24 March 2003. Sensors were installed on a 24-meter tower, and on 2-meter and 4-meter platforms.

Details

N: 40.78361, S: 40.575, E: -106.14167, W: -106.41694

Air Temperature, Atmospheric Pressure Measurements, Carbon and Hydrocarbon Compounds, Humidity, Longwave Radiation, Net Radiation, Outgoing Longwave Radiation, Precipitation Amount, Precipitation Rate, Shortwave Radiation, Snow Depth, Soil Heat Budget, Soil Moisture/Water Content, Soil Temperature, Surface Air Temperature, Surface Pressure, Surface Winds, Wind Profiles

CLPX-Ground: Snow Measurements at the Local Scale Observation Site (LSOS), Version 1

Dataset Summary

This data set presents snow depth, snow water equivalence (SWE), snow wetness data, and snow pit data from two pine sites and a small clearing at the Local Scale Observation Site (LSOS) of the Cold Land Processes Field Experiment (CLPX) in northern Colorado. The LSOS is a 0.8 ha study site located within the Fraser Intensive Study Area (ISA). The study area has flat topography with a uniform pine forest, a discontinuous pine forest, and a small clearing. Data were collected during February and March 2003.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.95, S: 0, E: 0, W: -105.9

2003/03/24 to 2003/03/30, 2003/02/19 to 2003/02/20, 2002/03/25 to 2002/03/30, 2002/02/22 to 2002/02/23 Snow Cover, Snow Density, Snow Depth, Snow Water Equivalent, Snow, Surface Roughness

CLPX-Ground: Sub-Canopy Energetics at the Local Scale Observation Site (LSOS), Version 1

Dataset Summary

This data set consists of solar and longwave radiation data from beneath two pine canopies (one uniform, one discontinuous) at the Local Scale Observation Site (LSOS) of the Cold Land Processes Field Experiment (CLPX) in northern Colorado. The LSOS is a 100 x 100-m study site located within the Fraser Intensive Study Area (ISA). The study area has flat topography with both a dense pine stand and an open pine stand. Data were collected during February and March 2002 and 2003.

This work addresses two of the overall CLPX questions: (1) How do the extent and evolution of snow and frozen landscapes affect fluxes, storage, and transformations of water, energy, and carbon? (2) At what scales does spatial variability of key state variables in the cryosphere (including snow characteristics, soil moisture, the extent of frozen soils, and the transition between frozen and thawed conditions) control fluxes and transformations of water, energy, and carbon, and can remote sensing resolve this variability at these scales?

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.9038, S: 39.9038, E: -105.883, W: -105.883

2001/11/01 to 2003/03/31 Canopy Characteristics, Longwave Radiation, Solar Radiation

CLPX-Ground: University of Michigan Ground-Based Microwave Radiometer, Version 1

Dataset Summary

This data set contains microwave radiometry data collected at the Local Scale Observation Site (LSOS) of the Cold Land Processes Field Experiment (CLPX) in Colorado, USA, during IOP4 (March-April 2003). The LSOS is a 100 x 100 m study site located within the Fraser Intensive Study Area (ISA). The LSOS has flat topography with areas of both uniform and discontinuous pine forest, and a small clearing. The majority of the data consist of brightness temperatures at a 54 degree incidence angle of the accumulated snowpack at the small clearing in the LSOS. Other observations include upwelling brightness temperatures from short and tall trees, and downwelling brightness temperatures from tall trees. Snowpack ranged from 0 to 80 cm in depth.The microwave radiometers operated at 6.7, 19, and 37 GHz.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 39.903611, S: 39.903611, E: -105.883056, W: -105.883056

2003/03/24 to 2003/04/02 Brightness Temperature

CLPX-Model: Land Data Assimilation System (LDAS) Data, Version 1

Dataset Summary

The LDAS data set contains 43 model and observation-based fields produced
by the LDAS uncoupled modeling system at the NASA Goddard Space Flight Center using the Mosaic Land Surface Model (LSM). Parameters include snow cover, snow depth, snow melt, albedo, precipitation, temperature, canopy characteristics, longwave and shortwave radiation, heat flux, soil moisture,
sublimation, snow water equivalent, and meteorolical parameters. Precipitation and solar radiation are observation-based, while other forcing variables (humidity, temperature, wind speed, pressure, longwave radiation) are derived from the National Centers for Environmental Prediction's (NCEP) Eta Data Assimilation System (EDAS). All other variables in the files are from the Mosaic LSM. Data were produced at an hourly resolution from 1 January 2001 through June 2003.

The LDAS data are delivered on an 1/8th-degree regular latitude/longitude grid covering the Large-Regional Study Area (LRSA), located between 38.5-42 N and 104-108.5 W. The resolution in the Y direction of each 1/8th degree LDAS pixel is 13899 meters over the whole domain. The resolution in the X direction ranges from 10878 meters at the southern edge of the LRSA to 10329 meters at the northern edge of the LRSA (it decreases as the distance between longitude lines decreases). Data are available via ftp on request.

The NASA Cold Land Processes Experiment (CLPX) is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 42, S: 38.5, E: -104, W: -108.5

2001/01/01 to 2003/08/01 Air Temperature, Albedo, Canopy Characteristics, Evaporation, Heat Flux, Humidity, Land Surface Temperature, Leaf Characteristics, Precipitation Amount, Runoff, Snow, Snow Cover, Snow Depth, Snow Energy Balance, Snow Melt, Snow Water Equivalent, Soil Moisture/Water Content, Soil Temperature, Solar Radiation, Surface Pressure, Surface Winds, Vegetation Index, Vertical Wind Motion

CLPX-Model: Local Analysis and Prediction System: 4-D Atmospheric Analyses, Version 1

Dataset Summary

The Local Analysis and Prediction System (LAPS), run by the NOAA's Forecast Systems Laboratory (FSL), combines numerous observed meteorological data sets into a collection of atmospheric analyses. LAPS analyses data include hourly three-dimensional and surface distributions of temperature, surface u and v winds, vertical velocity, dew-point temperature, relative humidity, specific humidity, pressure, MSL pressure, cloud type, mean cloud drop diameter, cloud base, cloud top, fractional cloud cover, cloud liquid water, cloud ice, surface precipitation type, rain concentration, snow concentration, soil moisture, snow accumulation, snow water equivalent, and snowmelt over the Cold Land Processes Experiment (CLPX) study areas in Colorado and Wyoming, USA (approximately 36.1°N through 45.8°N latitude, and 113.8°W through 97.2°W longitude). The CLPX LAPS analyses archive spans the period 1 September 2001 through 31 August 2003. Data are separated into a 2-D surface field group and a 3-D upper air group. Data are available at an hourly resolution on a 10-km horizontal grid (125 x 105), with the 3-D upper air group comprising 21 vertical levels. All data files are delivered in netCDF format.

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N: 42, S: 38.5, E: -104, W: -108.5

2001/09/01 to 2003/08/31 Air Temperature, Atmospheric Pressure Measurements, Cloud Amount/Frequency, Cloud Base, Cloud Ceiling, Convergence/Divergence, Dew Point Temperature, Evaporation, Humidity, Infiltration, Land Surface Temperature, Potential Temperature, Precipitation Amount, Precipitation Rate, Snow, Snow Cover, Snow Melt, Soil Moisture/Water Content, Surface Pressure, Surface Winds, Thermal Infrared, Visibility, Vorticity

CLPX-Model: Rapid Update Cycle 40km (RUC-40) Model Output Reduced Data, Version 1

Dataset Summary

The Rapid Update Cycle, version 2 at 40km (RUC-2, known to the Cold Land Processes community as RUC40) model is a Mesoscale Analysis and Prediction System (MAPS) data set that uses the Model Output Reduced Data Set (MORDS) version. This data set has been subsetted for use in the Cold Land Processes Field Experiment (CLPX). The data are in a 40 km (approximate) Lambertian latitude/longitude grid covering the Large-Regional Study Area (LRSA).The data set covers the period from 1 October 2002 through 30 June 2003, with a time step of 60 seconds. RUC40 data are stored in individual ASCII data files, with one file per hour. Within each hourly file, 42 data variables are stored in row-major order. The RUC40 model uses the Arakawa-C staggered horizontal grid, with u and v horizontal wind points offset from mass points to improve numerical accuracy, and there is no vertical staggering. Positive definite advection schemes are used for the continuity equation (advection of pressure thickness between levels) and for horizontal advection of virtual potential temperature, and all vapor and hydrometer moisture variables.

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N: 42.568, S: 38.394, E: -103.971, W: -108.615

2002/10/01 to 2003/06/30 Snow, Air Temperature, Albedo, Precipitation Amount, Longwave Radiation, Shortwave Radiation, Geopotential Height, Cloud Height, Heat Flux, Sea Level Pressure, Snow Melt, Soil Moisture/Water Content, Soil Temperature, Humidity, Runoff, Surface Air Temperature, Surface Pressure, Surface Winds

CLPX-Satellite: AMSR-E Brightness Temperature Grids, Version 1

Dataset Summary

This data set includes Aqua Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) passive microwave brightness temperatures gridded to the geographic (lat-lon) and UTM grids of the Cold Land Processes Field Experiment (CLPX) Large Regional Study Area (LRSA). Data are provided for passive microwave frequencies at 6.9, 10.7, 18.7,23.8, 36.5 and 89.0 GHz, separated by ascending and descending satellite passes, and include time files. These data are interpolated from swath space using inverse distance squared resampling. Grid resolution is approximately 25 km. Temporal coverage is 1 February - 31 May, 2003. Satellite passive microwave brightness temperatures can be used to derive snow water equivalent.

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N: 42, S: 38.5, E: -104, W: -108.5

2003/02/01 to 2003/05/31 Brightness Temperature, Microwave Imagery, Microwave Radiance

CLPX-Satellite: AVHRR/HRPT Brightness Temperatures and Reflectances, Version 1

Dataset Summary

This data set includes AVHRR/HRPT (Advanced Very High Resolution Radiometer/High Resolution Picture Transmission) brightness temperatures and reflectances over the NASA Cold Land Processes Field Experiment (CLPX) Large Regional Study Area (LRSA) (NW corner: 42°N, 108.5°W, SE corner: 38.5°N 104°W). Data are gridded to the LRSA at 1.1 km (or 30 arc-second) resolution. Data were collected between November 2001 and May 2003. Reflectance files contain flat binary rasters of 2-byte unsigned integers representing albedo. The brightness temperature files contain 2-byte unsigned integers representing interpolated temperatures in tenths of degrees Kelvin.

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N: 42.05, S: 38.45, E: -103.95, W: -108.55

2001/11/09 to 2003/06/26 Infrared Imagery, Visible Imagery

CLPX-Satellite: EO-1 Hyperion Surface Reflectance, Snow-Covered Area, and Grain Size, Version 1

Dataset Summary

This data set consists of apparent surface reflectance, subpixel snow-covered area and grain size collected from the Hyperion hyperspectral imager. The Hyperion imager has a spectral range of 400-2500 nm, a spectral resolution of 10 nm, spatial resolution of 30 m, and a swath width of 7.8 km. Sampling is scene based (256 samples, 512 lines).

The Hyperion capabilities provide resolution of surface properties into hundreds of spectral bands versus the six optical multispectral bands flown on traditional Landsat imaging missions. Through these large number of spectral bands, complex land ecosystems can be imaged and accurately classified. Data are available via FTP. Users must register with NSIDC User Services to obtain access to the data.

This data set is part of the NASA Cold Land Processes Field Experiment (CLPX). The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

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N: 40.3, S: 39.6, E: -105.7, W: -106

2002/03/19, 2002/02/15 Snow Cover, Reflectance

CLPX-Satellite: Landsat Thematic Mapper Imagery, Version 1

Dataset Summary

This data set consists of Lansat thematic mapper imagergy collected over
the Cold Land Processes Field Experiment (CLPX) Large Regional Study Area (LRSA), located between 104-108.5 W and
38.5-42 N. Data were collected between 10 November 2001 and 9 January 2003, using the Enhanced Thematic Mapper Plus sensor (ETM+) on Landsat 7 and the Thematic Mapper (TM) sensor on Landsat 5. Data consist of Level 1G imagery
products (radiance) that have been radiometrically and geometrically
corrected. Each band of Landsat data in the GeoTIFF format is delivered
as a greyscale, uncompressed, 8-bit string of unsigned integers. This data
set is part of the NASA CLPX

NASA CLPX is a multi-sensor, multi-scale
experiment that focuses on extending a local-scale understanding of water
fluxes, storage, and transformations to regional and global scales. Within
a framework of nested study areas in the central Rocky Mountains of the
western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses
on two seasons: mid-winter, when conditions are generally frozen and dry,
and early spring, a transitional period when both frozen and thawed, dry
and wet conditions are widespread.

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N: 41.3098, S: 39.34853, E: -104.51927, W: -107.23799

2001/11/10 to 2003/01/09 Infrared Imagery, Infrared Radiance, Reflected Infrared, Thermal Infrared, Visible Imagery, Visible Radiance

CLPX-Satellite: MODIS Radiances, Reflectances, Snow Cover and Related Grids, Version 1

Dataset Summary

This data set provides Moderate Resolution Imaging Spectroradiometer (MODIS) data from the Cold Land Processes Field Experiment (CLPX). These data are delivered in geographic (GEO) and Universal Tranverse Mercator (UTM) grids covering the Large-Regional Study Area (LRSA) in Colorado, USA. The data cover the time period Feb 15 (day 046) through May 15 (day 135), a total of 90 days, for both study years (2002-2003). Data were resampled from the original HDF-EOS product files containing either swath data or gridded data. Parameters include calibrated radiances, surface refelctance, snow cover, surface temperature/emissivity, and vegetation indices. Gridded data are provided in two formats: raw binary (including an ASCII header) and GeoTiff. Both formats are provided as output from the MODIS Reprojection Tool which is used to
regrid MODIS gridded data.

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N: 42, S: 38.5, E: -104, W: -108.5

2003/02/15 to 2003/05/15, 2002/02/15 to 2002/05/15 Emissivity, Land Surface Temperature, Reflectance, Snow Cover, Vegetation Index, Visible Imagery, Visible Radiance

CLPX-Satellite: Multi-angle Imaging Spectroradiometer (MISR) Products, Version 1

Dataset Summary

This data set includes Level-1B1radiance (all angles), Level-1B2 georectified terrain, and Level-2 land surface, and an ancillary geographic product for the Large Regional Study Area (LRSA) of the Cold Land Processes Field Experiment (CLPX) in northern Colorado and southern Wyoming. Data were collected between 15 February and 15 May 2002 and the same time period in 2003. Data are available via FTP.

The Multi-angle Imaging SpectroRadiometer (MISR) views Earth at nine widely spaced angles via radiometrically and geometrically calibrated images in four spectral bands at each of the nine angles, to provide global images with high spatial detail. Global spatial sampling is provided at 275 and 1100 meters. These images provide accurate measures of the brightness, contrast, and color of reflected sunlight.

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N: 42, S: 38.5, E: -104, W: -108.5

2002/02/15 to 2002/05/15, 2003/02/15 to 2003/05/15 Albedo, Visible Radiance

CLPX-Satellite: SSM/I Brightness Temperature Grids, Version 1

Dataset Summary

This data set includes Defense Meteorological Satellite Program (DMSP) F-13 passive microwave brightness temperatures gridded to the geographic (lat/long) and UTM grids of the Cold Land Processes Field Experiment (CLPX) Large Regional Study Area (LRSA). Data are provided for passive microwave frequencies at 19, 22, 37 and 85 GHz, separated by ascending and descending satellite passes, and include time files. Grid resolution is 25 km, which approximates the sampling resolution of the original swath data. Backus-Gilbert optimal interpolation is used to artificially increase (16 times) the density of brightness temperature measurements in the satellite swath reference frame. This process uses actual antenna patterns to create the oversampled array, and the net effect is as if the additional samples had been made by the satellite radiometer itself, i.e., the beam patterns and spatial resolutions of the interpolated data approximate those
of the original samples. This method is based on the earlier work of Galantowicz and England (1991) and Poe (1990). Please see the documentation
for the global version of this data set for complete details. Please see the documentation for the global version of this data set at http://nsidc.org/data/nsidc-0032.html for complete details.

Several things about this data set that are different:
1) Temporal coverage is limited to 1 February - 31 March 2002 and
1 February - 31 March 2003.
2) The projection/grid is not EASE-Grid, it is CLPX lrsa_geo720.0 and lrsa_utm25000. However, interpolation is Backus-Gilbert, so all the benefits of this interpolation are shared with the global data set.
3) Filenames are different. 4) CLPX grid dimensions are:
GEO720.0: 23 cols by 18 rows UTM25000: 17 cols by 17 rows
5) Grid resolution for CLPX is limited to the CLPX grids that approximate 25 km.

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N: 42, S: 38.5, E: -104, W: -108.5

2002/02/01 to 2002/05/31, 2003/02/01 to 2003/05/31 GEO720.0: 0.2 degrees Brightness Temperature, Microwave Imagery, Microwave Radiance