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

On July 26, 2023, at approximately 01:56 UTC, the SNPP spacecraft and all onboard instruments (including VIIRS) entered safe mode, pausing data collection. The SNPP VIIRS instrument was returned to operational mode at approximately 16:50 UTC on July 27, 2023. There will be a gap in temporal coverage during the period the instrument was in safe mode, between approximately 01:56 UTC Jul 26, 2023 through 16:50 UTC July 27, 2023. The products generated during the period after recovery from spacecraft anomaly may be reprocessed using the new LUT if it is deemed necessary.

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 updated through 5 July 2023. This data set provides daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection.

The MEaSUREs Greenland 6 and 12 day Ice Sheet Velocity Mosaics from SAR, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The velocity mosaics data now cover the period from 1 January 2015 to 24 May 2023.

The MEaSUREs Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has completed all reprocessing of Version 1 data between December 2021 and May 2023.

Data set DOI: https://doi.org/10.5067/MEASURES/CRYOSPHERE/NSIDC-0630.001

The SnowEx23 Laser Snow Microstructure Specific Surface Area Data, Version 1 (SNEX23_SSA) data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains vertical profiles of snow reflectance and specific surface area (SSA) from the Fairbanks region of central Alaska and the North Slope region of the northern Alaska coastal plain. Temporal coverage spans from 6 March 2023 to 16 March 2023.

On July 26, 2023, at approximately 01:56 UTC, the SNPP spacecraft and all onboard instruments (including VIIRS) entered safe mode, pausing collection. All instruments are currently in a non-nominal state and all data lost while the instruments are in safe mode will not be recoverable.  Data will not be released to the DAACs or the public until the calibration and validation team has approved its science quality. All data sets will experience a gap in temporal coverage.

Please note that all MODIS and VIIRS processing is currently on hold, due to a system wide backend issue that has affected all operations, beginning on Friday, July 21, 2023. An estimated timeline to resume all standard forward processing for MODIS and VIIRS data products is not currently available, and a delay in forward processing is expected.  Once processing has been fully restored, this announcement will be updated. 

The MEaSUREs Greenland Image Mosaics from Sentinel-1A and -1B, Version 4 dataset, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The temporal coverage of this dataset now spans from 01 January 2015 to 24 May 2023.

The Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2022. This data set provides daily and weekly sea ice motion vectors including browse images of the weekly data. The source data used to generate the daily and weekly ice motion estimates are derived from AVHRR, AMSRE, SMMR, SSMI, and SSMI/S sensors; IABP buoys; and NCEP/NCAR Reanalysis forecasts.

The EASE-Grid Sea Ice Age, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2022. This data set provides weekly estimates of sea ice age for the Arctic derived from remotely sensed sea ice motion and sea ice extent.

Data set DOI: https://doi.org/10.5067/UTAV7490FEPB

The AMSR-E/AMSR2 Unified L2B Global Swath Ocean Products, Version 1, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), is currently being updated to include the AMSR-E portion of the dataset from 2002 to 2011, as well as select AMSR2 data from 2017 to 2021. These files are being delivered to us in batches and will be made available as we receive them.

The MEaSUREs Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has resumed forward processing. Reprocessing of incomplete files is complete for data from 2023. Reprocessing from December 2021 to December 2022 is ongoing. Corrected files will be added as they become available.

The SMAPVEX19-22 Massachusetts Lidar Derived Digital Surface Model, Version 1 and SMAPVEX19-22 Millbrook Lidar Derived Digital Surface Model, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data consist of ground surface elevations derived from source lidar measurements collected in August 2022 in the vicinity of Millbrook, NY, and Petersham, MA during the SMAPVEX19-22 campaign.

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 2022. This data set contains sea ice concentrations, ice-covered areas, ice persistence, and sea ice extent for the Arctic and Antarctic.

The Daily Global Land Parameters Derived from AMSR-E and AMSR2, Version 3 dataset, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The dataset now covers the time period from 19 June 2002 to 31 December 2021. The 2016 data record has also been reprocessed to correct an issue caused by an incomplete reading of the 2016 brightness temperature record, which affected the DOY 204 to 366 data files.

The MODIS Version 6 (Collection 6) Snow Cover and Sea Ice data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) will be retired in August of 2023. After this date, access to the data will no longer be available, but documentation will remain available for future reference.  NSIDC encourages users to switch to the newer MODIS Version 6.1 (Collection 6.1) data.

The Visible Infrared Imaging Radiometer Suite (VIIRS) Collection 2 (Version 2)  data sets are now available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).  Collection 2 includes new and improved VIIRS S-NPP snow, sea ice, and ice surface temperature data sets, as well as the first public release of VIIRS data sets from the JPSS-1 (NOAA-20) satellite, which was launched on November 18, 2017.