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

The 2018 Antarctic and 2019 Greenland campaign data within the IceBridge ATM L2 Icessn Elevation, Slope, and Roughness, Version 2 data set has been replaced with reprocessed files at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The files originally delivered were discovered to have an error related to the application of the solid Earth tide correction within the timeframes of 03 November 2018 - 16 November 2018 and 03 April 2019 - 16 May 2019.

The 2018 Antarctic and 2019 Greenland campaign data within the IceBridge ATM L1B Elevation and Return Strength with Waveforms, Version 1 data set has been replaced with reprocessed files at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The files originally delivered were discovered to have an error related to the application of the solid Earth tide correction within the timeframes of 03 November 2018 - 16 November 2018 and 03 April 2019 - 16 May 2019.

The 2018 Antarctic and 2019 Greenland campaign data within the IceBridge ATM L1B Elevation and Return Strength, Version 2 data set has been replaced with reprocessed files at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The files originally delivered were discovered to have an error related to the application of the solid Earth tide correction within the timeframes of 03 November 2018 - 16 November 2018 and 03 April 2019 - 16 May 2019.

The 2018 Antarctic and 2019 Greenland campaign data within the IceBridge Narrow Swath ATM L1B Elevation and Return Strength with Waveforms, Version 1 data set has been replaced with reprocessed files at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The files originally delivered were discovered to have an error related to the application of the solid Earth tide correction within the timeframes of 10 October 2018 - 16 November 2018 and 03 April 2019 - 16 May 2019.

The 2018 Antarctic and 2019 Greenland campaign data within the IceBridge Narrow Swath ATM L1B Elevation and Return Strength, Version 2 data set has been replaced with reprocessed files at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The files originally delivered were discovered to have an error related to the application of the solid Earth tide correction within the timeframes of 10 October 2018 - 16 November 2018 and 03 April 2019 - 16 May 2019.

The IceBridge BedMachine Greenland, Version 4 data set 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/bathymetry map of Greenland based on mass conservation, multi-beam data, and other techniques. It also includes surface elevation and ice thickness data, as well as an ice/ocean/land mask. Version 4's temporal coverage spans from 1 January 1993 through 1 October 2020.

The MEaSUREs Greenland Ice Mapping Project (GIMP) Land Ice and Ocean Classification Mask, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. Land ice and ocean masks for the Greenland ice sheet for the year 2015 have been added.

The ICESat-2 L4 Monthly Gridded Sea Ice Thickness, Version 1 (IS2SITMOGR4) data set from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set reports monthly, gridded winter sea ice thickness in the Arctic. Sea ice thickness is estimated using ATLAS/ICESat-2 L3A Sea Ice Freeboard (ATL10), Version 4 freeboard data and NASA Eulerian Snow On Sea Ice Model (NESOSIM) snow depth.

The issues causing Antenna Scan Angle (ASA) errors in the most recent re-processed SMAP data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been resolved and the bad files have been replaced. The ASA errors occurred in selected Level-1 half-orbits and propagated into the associated Level-2, -3, and -4 products. ASA errors affected data files between 05 October 2019 and 23 November 2019, as well as selected dates in 2020, specifically 04-05 February, 09 April, 30 May, and 18 June.

The High Mountain Asia Global Debris Thickness Estimates and Sub-Debris Melt Factors, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been renamed for clarification. The new name is Global Debris Thickness Estimates and Sub-Debris Melt Factors, Version 1. The data files were not changed. Data set DOI: https://doi.org/10.5067/8DQKWY03KJWT

The AMSR-E/Aqua L2B Surface Soil Moisture, Ancillary Parms, & QC EASE-Grids, Version 3 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains gridded estimates of soil moisture in the top 1cm of soil. Two different algorithms are used to estimate soil moisture from the AMSR-E/Aqua L2A brightness temperature measurements: Normalized Polarization Difference algorithm (NPD) and the Single Channel Algorithm (SCA).

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 2020. 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 IceBridge KT19 IR Surface Temperature, Version 2 data set has been updated to now include data for the 2015 Arctic campaign from 19 March 2015 through 12 May 2015 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains surface temperature measurements of Arctic and Antarctic sea ice and land ice acquired by the Heitronics KT19.85 Series II Infrared Radiation Pyrometer operated by the Wallops Flight Facility (WFF) as part of the ATM instrument suite.

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 2020. 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 ATLAS/ICESat-2 L3B Annual Land Ice Height, (ATL11), 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 3 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The ATLAS/ICESat-2 L3B Daily and Monthly Gridded Sea Ice Freeboard (ATL20) data set has been updated to Version 2.

The High Mountain Asia 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 contains daily estimates of posterior snow water equivalent (SWE), fractional snow covered area (fSCA), and snow depth (SD) over High Mountain Asia.

The Canadian Meteorological Centre (CMC) Daily Snow Depth Analysis Data, Version 1 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. Data for the year 2020 have been added, so the daily and monthly snow depth and SWE files now span 1 August 1998 to 31 December 2020. This data set consists of a Northern Hemisphere subset of the CMC operational global daily snow depth analysis.

Multiple Level-1B, Level-2A, and Level-3A 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). These data sets provide: telemetry data; geolocated photon data; backscatter profiles; atmospheric layer characteristics; and geolocated surface elevations for land ice, land and vegetation, and ocean surface.

The High Mountain Asia Global Debris Thickness Estimates and Sub-Debris Melt Factors, 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 spatially distributed estimates of the debris thickness and sub-debris melt enhancement factors for every debris-covered glacier in the Randolph Glacier Inventory Version 6, excluding the ice sheets and Antarctic Periphery.

The IceBridge CAMBOT L1B Geolocated Images, Version 2 data set has been updated to include data from the 2019: Arctic, Arctic summer, and Antarctic campaigns, extending the temporal coverage from 10 October 2018 through 20 November 2019 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains high-resolution imagery taken with the Continuous Airborne Mapping By Optical Translator (CAMBOT) system over Antarctica and Greenland.