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

The Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2020. This data set contains snow cover and sea ice extent derived from SMMR and DMSP-F8, -F11, -F13, and -F17 SMM/I and SSMIS brightness temperature measurements. These data are provided on the 25 km Northern Hemisphere EASE-Grid 2.0.

The SnowEx20 Airborne SWESARR Brightness Temperature, 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 airborne microwave brightness temperature observations that were made between 10 to 12 February 2020, during the SnowEx20 campaign at Grand Mesa, Colorado.

The Nenana Ice Classic: Tanana River Ice Annual Breakup Dates, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The ice breakup date for 2021 has been added, so the data set now spans 1 April 1917 to 30 April 2021. This data set provides the date and time when the Tanana River ice, in the town of Nenana, AK, breaks up each spring.

The AMSR-E/AMSR2 Unified L3 Global Daily/5-Day/Monthly 25km EASE-Grid Snow Water Equivalent, Version 1 data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated. The data have been reprocessed to correct for the artificial, uniform boundary extending across North America for the snow water equivalent (SWE) values. The filenames for these reprocessed data contain ‘B02’ instead of ‘B01’.

The following 5 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC):

The Lagrangian Snow Distributions for Sea-Ice Applications, 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 snow depth and density for snow-on-sea-ice in the Arctic Ocean, generated using a Lagrangian snow-evolution model. It spans 01 August 1980 to 31 July 2018 and the spatial resolution is 25 km.

The High Mountain Asia Multitemporal Landslide Inventories, 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 landslide point locations along three important highways in Nepal: the Arniko, Karnali, and Pasang Lhamu highway. Data were derived from RapidEye satellite imagery and have a temporal coverage of 01 December 2009 to 31 December 2018.

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 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 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 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 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 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 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 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 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