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

On Monday August 8, 2022 the SMAP observatory entered a safe-mode which is designed to maintain its essential functions but stops science data acquisition. The Project team is investigating the cause of the anomaly and actively working on resuming operations and continued science data acquisition. The NSIDC DAAC archive will not have science data products during this period. However, generation of the model-based Level-4 products continues until further notice without SMAP observations.

The Sea Ice Trends and Climatologies from SMMR and SSM/I-SSMIS, Version 3 data set, available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been extended through 31 December 2021. This data set contains sea ice concentrations, ice-covered area, ice persistence, and sea ice extent for the Arctic and Antarctic.

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