Data Announcements

The MEaSUREs Polar EASE-Grid 2.0 Daily 6 km Land Freeze/Thaw Status from AMSR-E and AMSR2, Version 2 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The temporal coverage for this data set now spans 2 June 2002 to 31 December 2023.

Version 4 of MEaSUREs BedMachine Antarctica is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains a bed topography and bathymetry map of Antarctica deduced by subtracting the ice thickness from the surface elevation taken from the Reference Elevation Model of Antarctica (REMA). This version of the dataset includes new bathymetry data and ice thickness estimate inputs. Additionally, a new glacier mask has been added.

The SnowEx23 Apr23 Snow Surface Reflectance and Albedo, Version 1 (SNEX23_Albedo) and SnowEx23 Oct22 IOP Snow Pits and Substrate Conditions at Freeze Up, Version 1 (SNEX23_Oct22_SP) data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The SNEX23_Albedo data set contains a comprehensive set of field-based measurements of snow surface reflectance and broadband snow albedo collected during the NA

The SMAPVEX19-22 Massachusetts Field Measured Forest Tree Inventory, Biophysical Data, Leaf Area Index, and Estimated Biomass, Version 1, and SMAPVEX19-22 Millbrook Field Measured Forest Tree Inventory, Biophysical Data, Leaf Area Index, and Estimated Biomass, Version 1, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

ATLAS/ICESat-2 ATL02 Linear Impulse Response, Version 1 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This ancillary ICESat-2 data set contains the linear impulse response in units of time-of-flight, which was measured over the Salar de Uyuni using ATL02 photon data.

Access to the Glacial and Fast Ice Distributions in Southeast Greenland Fjords, Version 1 data set (NSIDC-0796) in the legacy, on-premises archive at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been retired. The NASA Earthdata Cloud is now the primary data archive for ICESat-2 data.

Access to ICESat-2 Derived Canopy Height Model, Version 1 data set (IS2CHM) in the legacy, on-premises archive at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been retired. The NASA Earthdata Cloud is now the primary data archive for ICESat-2 data.

Version 6 of ATLAS/ICESat-2 L2A Normalized Relative Backscatter Profiles (ATL04), ATLAS/ICESat-2 L3A Land Ice Height (ATL06), ATLAS/ICESat-2 L3A Land and Vegetation Height (ATL08), ATLAS/ICESat-2 L3A Calibrated Backscatter Profiles and Atmospheric Layer Characteristics

The National Snow and Ice Data Center (NSIDC) has released Version 6 of the NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration data set and Version 4 of the Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration data set. These new versions provide daily and monthly sea ice concentration data for the north and south polar regions from 25 October 1978 to the present, on a 25 km × 25 km polar stereographic grid.The main changes in these new versions include the following:

The Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 105, and the Near Real-time SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 107, data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), in the NASA

The Quicklook Arctic Weekly EASE-Grid Sea Ice Age, Version 1, and Quicklook Arctic Weekly EASE-Grid Sea Ice Motion Vectors, Version 1 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated with data from 1 January 2025 through 2 December 2025.

The Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vector Version 4 and EASE-Grid Sea Ice Age Version 4 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated through 2024. The Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vector data set contains daily and weekly sea ice motion vectors, as well as browse images representing the weekly data.

The Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 5 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include data through 2025. Data files are now available in yearly NetCDF files, replacing the single multi-year NetCDF data file.

The ATLAS/ICESat-2 L3B Monthly Gridded Dynamic Ocean Topography, Version 4, and ATLAS/ICESat-2 L3B Monthly 3-Month Gridded Dynamic Ocean Topography, Version 2 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), require reprocessing.

High Mountain Asia Daily Reach-Scale River Discharge using Data Assimilation, 2004-2019, Version 1 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set reports daily, reach-scale river discharge for 114,147 river reaches in the High Mountain Asia region from 1 January 2004 through 31 December 2019.

ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height, Version 5 (ATL14), and ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height Change, Version 5 (ATL15) are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

Access to the Glacial and Fast Ice Distributions in Southeast Greenland Fjords, Version 1 data set (NSIDC-0796) in the legacy, on-premises archive at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) will be retired on 15 January 2026. The NASA Earthdata Cloud is now the primary data archive for this data.

Access to ICESat-2 Derived Canopy Height Model, Version 1 data set (IS2CHM) in the legacy, on-premises archive at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) will be retired on 15 January 2026. The NASA Earthdata Cloud is now the primary data archive for this data.

Version 6 of both ATLAS/ICESat-2 L1B Converted Telemetry Data and ATLAS/ICESat-2 L2A Global Geolocated Photon Data will be retired from the NSIDC DAAC on 2 February 2026. Upon retirement, data will no longer be accessible, but all related documentation will remain available on the data set web page for future reference.

NOAA@NSIDC will retire the following sea ice concentration (SIC) CDR data sets on 15 January 2026: