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

Version 3 of the ATLAS/ICESat-2 L3B Weekly Gridded Atmosphere (ATL16) and ATLAS/ICESat-2 L3B Monthly Gridded Atmosphere (ATL17) data sets, will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 18 August 2022. After this date, access to the data will no longer be available, but the data set documentation will remain available for future reference. Version 4 of each data set was released on 21 February 2022.

The ICESat-2 L4 Along-Track Sea Ice Thickness (IS2SITDAT4), 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 reports daily, along-track winter sea ice thickness across the Arctic Ocean. Sea ice thickness is estimated using ATLAS/ICESat-2 L3A Sea Ice Freeboard (ATL10), Version 4 data and NASA Eulerian Snow On Sea Ice Model (NESOSIM) snow loading.

The Western United States UCLA Daily Snow Reanalysis, 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 provides snow reanalysis over the Western United States derived by assimilating satellite retrieved fractional snow-covered area (fSCA) observations from the Landsat satellite platforms between Water Year (WY) 1985 and 2021. The data set contains daily estimates of posterior snow water equivalent (SWE), fSCA, and snow depth (SD).

The latest version of AMSR-E/Aqua L2B Global Swath Surface Precipitation GSFC Profiling Algorithm, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), was released in the last year and data reprocessing is now complete. The full temporal coverage, 1 June 2002 to 4 October 2011 is available.

The MEaSUREs Polar EASE-Grid 2.0 Daily 6 km Land Freeze/Thaw Status from AMSR-E and AMSR2, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to Version 2. In this version, the data set title changed from “MEaSUREs Northern Hemisphere Polar EASE-Grid 2.0 Daily 6 km Land Freeze/Thaw Status from AMSR-E and AMSR2” to reflect the addition of the Southern Hemisphere polar grid.

On 18 April 2022, the IMS Daily Northern Hemisphere Snow and Ice Analysis files were renamed. Two updates were made to the file names:

The SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture data set archived at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. The data that were missing due to last years software issue at the SMAP Science Data System (SDS) have now been backfilled. Data from 27th October 2021 to 12 February 2022 are now available to download.

Data set DOI: https://doi.org/10.5067/ASB0EQO2LYJV

The MEaSUREs Annual Antarctic Ice Velocity Maps, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), is now at Version 1.1. In this minor version update, the data set title changed from MEaSUREs Annual Antarctic Ice Velocity Maps 2005-2017 to MEaSUREs Annual Antarctic Ice Velocity Maps. This latest release also includes the addition of 2000/2001, 2017/2018, 2018/2019, and 2019/2020 annual velocity maps.

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), has been updated to include new data from 1 May 2021 to 31 December 2021. This data set contains twice-daily, enhanced-resolution brightness temperature data derived from the SMAP radiometer.

Data set DOI: https://doi.org/10.5067/YAMX52BXFL10

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include new data through 31 August 2021. 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 1 November 1978.

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 to include new data through 31 December 2021. 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 latest versions of four SMAP Level-2 and Level-3 data sets, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), were released in the last year and data reprocessing is now complete. The full temporal coverage, from 31 March 2015 to present is available. Also, customization services are now available for the polar grid variables for the SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 5 data set.

NOAA@NSIDC is pleased to announce that the Glacier Covered Area for the State of Alaska, 1985-2020, Version 1 data set is now available at the National Snow and Ice Data Center (NSIDC). This data set captures changes in glacier covered area across the state of Alaska for the period of 1985-2020. The data set includes 18 biannual shapefiles each for overall glacier covered area, supraglacial debris area, and debris-free glacier covered area.

The LVIS L1A Geotagged Images, Version 1 data set has been updated at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) to now include data from flights held on 16 July 2021 through 6 August 2021. These flights were conducted over the eastern US and French Guiana collecting calibration and validation data for the NASA Global Ecosystem Dynamics Investigation (GEDI) mission.

The SMAPVEX15 PALS Soil Moisture Data, 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 soil moisture data derived from the brightness temperatures measured by the Passive Active L-band System (PALS) microwave aircraft instrument.

The ATLAS/ICESat-2 L3B Annual Land Ice Height (ATL11) data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to Version 5. Changes to this version include: addition of cycles 12 and 13 of the ICESat-2 data, removal of some orbit specific parameters that are not needed for ATL11, and implementation of mean-tide inclusion for converting geoid heights.

All versions (1-6) of the Randolph Glacier Inventory - A Dataset of Global Glacier Outlines are now accessible through the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains a global set of glacier outlines, is intended to provide a snapshot of the world’s glaciers, and includes a single outline for each glacier. It is produced in coordination with the Global Land Ice Measurements from Space (GLIMS) initiative.

The ICESat-2 mission, at the recommendation of the Satellite Needs Working Group, has released a subset of ATLAS/ICESat-2 data sets that will be available at an expedited latency. These “quick look” data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The SnowEx20 Grand Mesa Snow Depth from Snow Pole Time-Lapse 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 snow depth measurements derived from time-lapse images collected by cameras placed around Grand Mesa, CO at 29 sites coincident with other SnowEx 2020 measurements. The images span from 29 September 2019 through 10 June 2020.