NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC)

The MEaSUREs Greenland Annual/Quarterly/Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 2 data sets have been updated. These annual, quarterly and monthly data sets have been reprocessed using a more rigorous culling scheme and a new DEM. The dT parameter, which can be used to assess the temporal skew in the data, is now also available for the annual and monthly data sets. New data have been added so the data sets now span 01 December 2014 - 30 November 2019. The data are available as cloud-optimized GeoTIFFs and the file naming convention has changed.

The SnowEx20 Grand Mesa IOP BSU 1 GHz Multi-polarization GPR CMP Snow Water Equivalent, Version 1 and SnowEx20 Grand Mesa IOP BSU Multi-polarization 1 GHz GPR CMP Travel-Times, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The SnowEx20 COSMOS Rover Soil Moisture, Version 1 and SnowEx20 COSMOS Stationary Soil Moisture, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The SnowEx20 Raw Near Surface Snow Temperature Profile Time Series, Version 1 and SnowEx20 Grand Mesa IOP BSU Multi-polarization 1 GHz GPR CMP Raw, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The IceBridge CAMBOT L0 Raw Imagery, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains raw images and associated aircraft position and attitude data taken over Antarctica and Greenland by the Continuous Airborne Mapping By Optical Translator (CAMBOT), part of the Airborne Topographic Mapper (ATM) instrument suite. Data are available from 10 October 2018 through 20 November 2019.

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 data set, available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 October 2020. This data set consists of daily and monthly sea ice concentrations derived from brightness temperature measurements. This data set is available for the north and south polar regions, with a temporal coverage extending back to 26 October 1978.

The SnowEx20 Grand Mesa IOP BSU 1 GHz Multi-polarization GPR, Version 1 data set, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains snow water equivalent (SWE) and snow depth estimates derived from Ground Penetrating Radar (GPR) measurements. GPR measurements were collected during the SnowEx 2020 Grand Mesa Intensive Observation Period (IOP) between 28 January and 04 February 2020.

The SnowEx20 Boise State University Terrestrial Laser Scanner (TLS) Point Cloud, Version 1 and SnowEx20 Boise State University Raw Terrestrial Laser Scanner (TLS) Point Cloud, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain processed and raw terrestrial laser scanner (TLS) point cloud data collected as part of the 2020 SnowEx campaign in Grand Mesa, Colorado.

The Multilayer Greenland Ice Surface Temperature, Surface Albedo, and Water Vapor from MODIS, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated with temporal coverage through 31 December 2019 and corrected projection metadata. This data set contains MODIS ice surface temperature, surface albedo, water vapor, and derived melt maps, for Greenland. These data are provided at a spatial resolution of 0.78 km.

The SnowEx20 CRREL Terrestrial Laser Scanner (TLS) Point Cloud, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data contains terrestrial LIDAR survey (TLS) point cloud data collected at Grand Mesa, Colorado as part of the 2020 SnowEx campaign. Data were collected in fall 2019 (September) and winter 2020 (January and February).

The SnowEx20 Grand Mesa Intensive Observation Period Snow Pit Measurements, Version 1 data set, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains snow pit observations from the SnowEx 2020 Grand Mesa Intensive Observation Period. Data were collected from 154 snow pits on Grand Mesa, Colorado between 27 January and 12 February 2020.

The ATLAS/ICESat-2 L3B Annual Land Ice Height, (ATL11) data set from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission has been updated to Version 2 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data contains surface height estimates both for crossovers and for along-track reference points between crossovers.

Multiple SMAP Validation data sets are now available at NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain soil moisture, soil temperature and precipitation measurements recorded in 2016 in Iowa, USA.

SMAPVEX16-IA Permanent Soil Moisture Network, Version 1 Data set DOI: https://doi.org/10.5067/P3ZUS77FW7JL

SMAPVEX16-IA Manual ThetaProbe Soil Moisture, Version 1 Data set DOI: https://doi.org/10.5067/QUZD7OEEVRFZ

On October 5, 2020 MODIS Terra experienced a Printed Wire Assemblies (PWA) failure. This failure caused partial to full science data loss where the data could not be played back because of recording on the faulty PWA. The Flight Operations Team have decided to change the day/night coverage ratio from current 50/50 to 44.2/55.8 to minimize the overflow of onboard buffers. Due to this change there is an observed reduction and irregularity in the overall Terra daytime coverage, particularly over high latitudes.

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 October 2020. This data set is generated from brightness temperature data and is designed to provide a consistent time series of sea ice concentrations spanning the coverage of several passive microwave instruments.

The IceBridge UAF Lidar Scanner L1B Geolocated Surface Elevation Triplets, Version 1 data set has been updated to include 2020 Alaska campaign data from 21 May 2020 through 05 June 2020 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains scanning laser altimetry data points acquired by the airborne University of Alaska Fairbanks (UAF) Glacier Lidar system.

Data Set DOI: https://doi.org/10.5067/AATE4JJ91EHC

The Daily 4 km Gridded SWE and Snow Depth from Assimilated In-Situ and Modeled Data over the Conterminous US, Version 1 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. New data have been added so the data set now spans 1 October 1981 to 30 September 2020.

The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 5 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 1 November 2020. This data set contains daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection.

The IceBridge KT19 IR Surface Temperature, Version 2 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains surface temperature measurements of Arctic and Antarctic sea ice and land ice acquired by the Heitronics KT19.85 Series II Infrared Radiation Pyrometer operated by the Wallops Flight Facility (WFF) as part of the ATM instrument suite.

Multiple High Mountain Asia Regional Climate Model Simulations data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain modeled data in the High Mountain Asia region, generated by the Coupled-Ocean-Atmosphere-Waves-Sediment Transport (COAWST) modeling system in 1-hour, 6-hour, daily, and monthly snapshots.

The NSIDC DAAC provides access to documentation and these data sets from the following locations: