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

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include new data through 30 September 2023. This data set consists of daily and monthly sea ice concentrations derived from brightness temperature measurements. This data set is available for the north and south polar regions, with a temporal coverage extending back to 1 November 1978.

The ATLAS/ICESat-2 L3B Weekly Gridded Atmosphere (ATL16) and ATLAS/ICESat-2 L3B Monthly Gridded Atmosphere (ATL17), Version 4 data sets will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 4 April 2024. After this date, access to the data will no longer be available.  Data set documentation will remain accessible for future reference.

The SnowEx23 Laser Snow Microstructure Specific Surface Area Snow-off Data, 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 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, collected as part of the NASA SnowEx 2023 field campaign.  Temporal coverage spans from 17 O

The MEaSUREs Greenland Image Mosaics from Sentinel-1A and -1B, Version 4 and MEaSUREs Greenland 6 and 12 day Ice Sheet Velocity Mosaics from SAR, Version 2 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated. The temporal coverage for the image mosaics has been extended until 26 December 2023, and the 6 and 12 day velocity mosaics now spans until 14 December 2023.

High Mountain Asia Daily 5km Landslide Hazard Indicator, Version 1 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set projects the daily hazard of rainfall-triggered landslides in the High Mountain Asia region from 2015 through 2100, at 5 km resolution. Projections are provided for two Shared Socioeconomic Pathways (SSPs)—SSP2-4.5 and SSP5‑8.5—based on temperature and precipitation projections from a 30-member ensemble climate model.

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 Jan 2024. This data set provides daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection.

The ASO L4 Lidar Snow Depth 3m UTM Grid, Version 1, ASO L4 Lidar Snow Depth 50m UTM Grid, Version 1, and ASO L4 Lidar Snow Water Equivalent 50m UTM Grid, Version 1 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated. Incorrectly geolocated Quality flag (QF) files for Grand Mesa, CO from February 2017 have been

Version 2 of IceBridge LVIS L1B Geolocated Return Energy Waveforms, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include data from 14 April 2009 to 10 May 2012. This data set contains return energy waveform data measured over Greenland, Alaska, and Antarctica by the NASA Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter. Temporal coverage now spans 14 April 2009 to 20 September 2017.

The IceBridge LVIS L1A Geotagged Images, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been expanded with the addition of over 100,000 images from the 2015 southern hemisphere campaign. This data set contains geotagged images taken over Greenland and Antarctica by the NASA Digital Mapping Camera paired with the Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter.

The ATLAS/ICESat-2 L3B Monthly Gridded Dynamic Ocean Topography (ATL19) and ATLAS/ICESat-2 L3B Mean Inland Surface Water Data (ATL22), Version 2 data sets will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 12 March 2024. After this date, access to the data will no longer be available.  Data set documentation will remain accessible for future reference.

ICESat-2 Derived 30 m Along-Track Boreal Aboveground Biomass Density, Version 01 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).  This data set provides a quality-filtered set of ATLAS/ICESat-2 L3A Land and Vegetation Height (ATL08), Version 5 observations of relative canopy heights and aboveground biomass density model results for circumpolar boreal forests.  The data were collected at 30 m along-track segment lengths during the 2019–2021 high

The SnowEx23 Bonanza Creek Experimental Forest Terrestrial Lidar Scans, Version 1 and SnowEx23 Bonanza Creek Experimental Forest Terrestrial Lidar Scans Raw, Version 1 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain digital terrain models (DTMs) derived from terrestrial lidar scans (TLS) collected as part of the SnowEx 2023 campaign and the unprocessed poi

The SnowEx Colorado 3M Snow Depth Time Series and DEMs from High-Resolution Satellite Image Pairs, 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 a time series of snow depth maps and related intermediary snow-on and snow-off DEMs for Grand Mesa, Colorado derived from very-high-resolution (VHR) satellite stereo images and lidar point cloud data.

The Automated Greenland Glacier Termini Position Time Series, 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 shapefiles of termini traces from 294 Greenland glaciers, derived using a deep learning algorithm applied to satellite imagery.  Also available are supplementary data, including temporal coverage of termini traces, time series data of termini variations, and updated land, ocean, and ice masks deriv

Previous versions of multiple ATLAS/ICESat-2 along-track data sets will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 26 February 2024. After this date, access to the data will no longer be available.  Data set documentation will remain accessible for future reference. We recommend using the latest versions of these data sets, which have been available since August 2023.

The Daily Lake Ice Phenology Time Series Derived from AMSR-E and AMSR2, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. New data has been added from 01 Jan 2016 to 31 December 2022. This dataset provides 5 km ice phenology retrievals that describe the daily lake ice conditions (ice-on/ice-off) over the Northern Hemisphere.

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 2 data set, available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through  30 September 2023. 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 Quarterly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 5 and MEaSUREs Greenland Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 5 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated. New data has been added, and both datasets now span from 01 December 2014 to 31 August 2023.

The MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from InSAR, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. New data from 21 January 2022 to 20 September 2023 have been added.