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

The ATLAS/ICESat-2 L3B Weekly Gridded Atmosphere (ATL16) and ATLAS/ICESat-2 L3B Monthly Gridded Atmosphere (ATL17) data sets from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission have been updated to Version 4 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The MEaSUREs Global Record of Daily Landscape Freeze/Thaw Status, Version 5 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), is now available. This data set now includes data through the end of 2020. The ERA5 surface air temperature record was used to calibrate the MSTA and a constant threshold was applied to determine the F/T state when the correlation between ERA5 SAT and Tb is low (r<0.5) over permanent snow/ice regions.

The SMAP/In Situ Core Validation Site Land Surface Parameters Match-Up Data, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated.

The SnowEx20 Grand Mesa Time-Lapse Imagery (SNEX20_TLI), 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 sub-daily time-lapse images collected by cameras placed around Grand Mesa, CO at 29 sites coincident with other SnowEx 2020 measurements. This data set spans from 21 September 2019 to 18 August 2020.

Data set DOI: https://doi.org/10.5067/P3D1QRH7O8X5

The ATLAS/ICESat-2 L3B Mean Inland Surface Water Data (ATL22), Version 2 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The LVIS Classic L2 Geolocated Surface Elevation and Canopy Height Product, 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 GEDI calibration and validation flights over the eastern US and French Guiana in July and August 2021. This data set contains Level-2 geolocated surface elevation and canopy height measurements collected by the NASA Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter.

The LVIS Classic L1B Geolocated Return Energy Waveforms, 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 GEDI calibration and validation flights over the eastern US and French Guiana in July and August 2021. This data set contains Level-1B geolocated return energy waveforms collected by the NASA Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter.

The MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from InSAR, Version 4 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. New data covering the time period between 07 June 2021 to 01 October 2021 have been added. 

The SMAP/In Situ Core Validation Site Land Surface Parameters Match-Up Data, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. Additional supporting core site files for 15 sites for the SPL2SMP_E data set have been added that cover time periods between 04 January 2015 and 31 March 2020.

The MODIS Collection 6.1 Snow Cover and Sea Ice data sets, accessible through 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 February 2000 for MODIS/Terra data sets and July 2002 for MODIS/Aqua data sets to present, is available.

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 September 2021. This data set provides daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection.

The SnowEx17 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 time-lapse images from 34 sites around Grand Mesa, CO and one site at Senator Beck Basin, CO.

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 May 2021.

The snowmelt and sublimation files have been temporarily removed from the High Mountain Asia UCLA Daily Snow Reanalysis, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).  A significant bias has been discovered in the snowmelt and sublimation data that is not easily correctable in the current files.  These data will be reprocessed and made available again as soon as possible.  We do not recommend using the previously released snowmelt a

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 May 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 MEaSUREs Greenland Image Mosaics from Sentinel-1A and -1B, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated with mosaics through 31 October 2021. This data set, part of the Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program, consists of 6 and 12-day 50 m resolution image mosaics of the Greenland coastline and ice sheet periphery beginning in January 2015.

The IceBridge Accumulation Radar L1B Geolocated Radar Echo Strength Profiles, Version 2 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include data for the Spring 2018 Greenland campaign. This data set contains radar echograms taken over Greenland and Antarctica using the Center for Remote Sensing of Ice Sheets (CReSIS) Accumulation Radar instrument.

The AMSR-E/AMSR2 Unified L2B Global Swath Ocean Products, 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 global water vapor over ocean, cloud liquid water content over ocean, and sea surface wind speed between 89°24' N to 89°24' S latitudes at a spatial resolution of 10 km along track and 5 km along scan. 

New versions of multiple Level-3A and Level-3B data sets from the Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) mission are available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC):  ATLAS/ICESat-2 L3A Along Track Inland Surface Water Data (ATL13), Version 5; ATLAS/ICESat-2 L3B Daily and Monthly Gridded Sea Ice Freeboard (ATL20), Version 3 and ATLAS/ICESat-2 L3B Daily and Month

The ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height, Version 1 (ATL14) and ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height Change, Version 1 (ATL15) data sets from the Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) mission are available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).