Data Announcements

The SMAP Project performs annual reprocessing of all its science data products based on improvements in the algorithms and supporting information. As part of this routine reprocessing, the SMAP Science Data System (SDS) has now released new versions of the following four Level-2 and -3 data products, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC): SMAP L2 Radiometer Half-Orbit 36km EASE-Grid Soil Moisture, Version 8 

SnowEx20 Grand Mesa Reference GIS Data Sets, Version 1 are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This product contains geolocation information for the scientific infrastructure for the SnowEx20 Intensive Observation Period (IOP) and Time Series (TS) campaigns over the time period 21 September 2019 to 14 February 2020.

The MEaSUREs Annual Greenland Outlet Glacier Terminus Positions from SAR Mosaics, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is now available. New data have been added so the data set now spans winter seasons from 2000 to 2021. Gaps in the mosaic coverage throughout the data record have been filled in using Landsat-7 and -8 imagery, so every winter season now contains terminus locations for every glacier.

The Terra flight operations team conducted Terra’s last inclination adjust maneuver to maintain Terra’s orbit in February 2020. The inclination adjust maneuvers were used to control the platform’s 10:30 AM mean local time (MLT) equator crossing. Terra will continue to drift and is expected to reach a 10:15 AM MLT in October 2022.

The following data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated with new data for the following time ranges: MEaSUREs Greenland Quarterly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 3 01 December 2020 to 31 May 2021 MEaSUREs Greenland Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 3 01 December 2020 to 31 May 2021

NSIDC is pleased to announce the release of a new data set, Inventory of Arctic Rain on Snow Events: Meteorological and Surface Conditions, Version 1.

The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 6 data, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated with corrected data for 2021. A data processing error was discovered that caused the sporadic exclusion of F17 data, F18 data, or both from files starting on 1 January 2021 through 5 June 2021. These corrected files are now available for download. We apologize for any inconvenience caused by this error.

The High Mountain Asia Annual 90m Glacier Surface Melt/Freeze Phenology from SAR 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 annual surface melt onset and freeze onset dates across all glaciers in the Hindu Kush Himalayas (HKH) retrieved from time series synthetic aperture radar (SAR) imagery.

NOAA@NSIDC is pleased to announce the release of the Rutgers Northern Hemisphere 24 km Weekly Snow Cover Extent, September 1980 Onward data set. This data set provides weekly snow cover extent at a 24 km resolution for the Northern Hemisphere from September 1980 in NetCDF format. The time series currently goes to September 2021 but will be updated on an annual basis every September.

NOAA@NSIDC is pleased to announce that the 2021 ice season data is now available from the Daily Great Lakes Ice Concentration, 1973 Onward data set. The new data span 22 November 2020 through 29 April 2021. This data set consists of daily gridded lake ice concentration for the Laurentian Great Lakes from the NOAA Great Lakes Environmental Research Laboratory (GLERL). The data are provided as gridded ASCII text files along with corresponding browse image files in .jpg format.

The SnowEx20 Grand Mesa Autumn 2019 Snow Pits, 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 measurements obtained during the SnowEx 2020 campaign at the Grand Mesa, Colorado, USA site in Autumn 2019. Twenty-one snow pit locations were visited during the period 04 November 2019 – 06 November 2019. Some snow pit measurements are incomplete due to shallow or discontinuous snow cover.

It was discovered that data from the MODIS/[Terra/Aqua] CGF Snow Cover Daily L3 Global 500m SIN Grid, Version 61 products, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), for the month of January 2019 were produced without the necessary spin-up phase that ensures the stability of the algorithm. The files from 01 January 2019 through 31 January 2019 will be replaced once reprocessed, and in the meantime data for this period will be missing.

The IceBridge MCoRDS L1B Geolocated Radar Echo Strength Profiles, Version 2 and IceBridge MCoRDS L2 Ice Thickness, Version 1 data sets at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) have been updated to include data from the Spring 2018 Arctic campaign.  These data were acquired using the University of Kansas Center for Remote Sensing of Ice Sheets (CReSIS) Multichannel Coherent Radar Depth Sounder (MCoRDS).

The SnowEx20 Grand Mesa Autumn 2019 Snow Depth, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).  Snow depth was measured in autumn 2019 (04-07 November) as part of the NASA SnowEx 2020 campaign at Grand Mesa, CO. Measurements were taken in the vicinity of snow pit locations and between pit locations using a Magnaprobe or manual depth probes.

The SMAPVEX16 Manitoba In Situ Vegetation Data, Version 1 data set available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. The CSV file containing crop biomass data has been updated to include additional data from all sites. A geodatabase in compressed ZIP format, has also been added, containing tables and ancillary data, such as flight lines and the shapefiles for the study area.

The temporal coverage for the ICESat-2 L4 Monthly Gridded Sea Ice Thickness, Version 1 (IS2SITMOGR4) data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been extended to include data for September 2019 (supplementing the existing data for the 2019-2020 winter season), as well as September 2020 through April 2021.  This data set reports monthly, gridded winter sea ice thickness across the Arctic Ocean.

The CALFIN Subseasonal Greenland Glacial Terminus Positions, 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 polyline and polygon shapefiles of glacial terminus positions in Greenland from 1972 to 2019. The temporal resolution is sub seasonal and the spatial resolution is approximately 30m. Shapefiles are available for individual glaciers and there are also shapefiles that contain all of the glaciers that were studied.

The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 6 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been released through 5 June 2021.

The Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent (NISE) data set, available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), now includes data derived from all available Special Sensor Microwave Imager/Sounder (SSMIS) sensors. Version 5 of the NISE data set contains data from the F18 SSMIS sensor. The newly released data from the F16 and F17 will be provided in Version 3 and Version 4, respectively. Data from F16, F17, and F18 will all be updated in near-real-time as new data are processed.

The SMAP Radiometer Twice-Daily rSIR-Enhanced EASE-Grid 2.0 Brightness Temperatures, Version 2 data set accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), is now available. The data set has been reprocessed using SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 5 as input. This input is different enough from version 1 that users should not mix gridded version 1 and 2 data.