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

Temporal updates for 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 are now available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The temporal coverage for both the image mosaics and 6 and 12 day velocity mosaics data now spans from 01 January 2015 to 24 January 2023.

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 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 31 December 2022. 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 Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 1 data set, will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 30 April 2023. Upon retirement, data will no longer be accessible. All related documentation will remain available on the data set web page for future reference.

Images of Antarctic Ice Shelves, Version 2 (NSIDC-0102), accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include MODIS imagery through February 2023. This data set was created to monitor major ice streams and outlet glaciers along the Antarctic coast, with a focus on the ice shelves most susceptible to rapid change due to climatic warming and those that occasionally calve major icebergs.

The MEaSUREs Greenland Quarterly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 4 and MEaSUREs Greenland Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 4 data sets will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on April 24, 2023.

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 31 December 2022. 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.

Users of MODIS Terra and Aqua data from the NASA National Snow and Ice Data DAAC should be aware that a Science Mission Directorate (SMD) Request for Information (RFI) was released on March 1, 2023 by the NASA Solicitation and Proposal Integrated Review and Evaluation System (NSPIRES). This RFI seeks input from the science community that will be considered in the development and implementation of a Terra, Aqua, and Aura (T/A/A) data continuity workshop planned for May 23-25, 2023.
 

The LVIS Facility L1B Geolocated Return Energy Waveforms, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include data over Greenland for April and July 2022. This data set contains Level-1B geolocated return energy waveforms collected by the NASA Land, Vegetation, and Ice Sensor (LVIS) Facility, an airborne lidar scanning laser altimeter.

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 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 2022. 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 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 datasets are now available. These datasets can be accessed through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The quarterly and monthly datasets have been recalibrated using an improved balance velocity estimate and excluding 2000-m GPS points from the 1990s.

The SMAP-derived 1-km downscaled surface soil moisture product, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data product contains global daily 1-km resolution surface soil moisture obtained from the SMAP L-band radiometer and is available in GeoTIFF format.

The SnowEx20-21 QSI Lidar DEM 3m UTM Grid (SNEX20_QS1_DEM), Version 1, SnowEx20-21 QSI Lidar Snow Depth 3m UTM Grid (SNEX20_QS1_SD), Version 1 and SnowEx20-21 QSI Lidar Vegetation Height 3m UTM Grid (SNEX20_QS1_VH), Version 1 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

As of 25 February 2023, C6 Forward processing of Terra and Aqua MODIS Land data products has been discontinued. The Collection 6.1 (C61) corrects these calibration issues and has a number of product specific improvements and enhancements that are listed in the C61 change document here.  Data for C6.0 will remain available for six months, but the NSIDC encourages users to switch to the newer Collection 6.1 data. 

The MEaSUREs Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), experienced a processing error from December 2021 to present. Forward processing of the data is paused until reprocessing is complete. An additional user notice will be sent when the reprocessed data become available and forward processing resumes.

The MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from InSAR, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. This update extended the temporal coverage through 28 January 2023, with new data files for the period spanning 5 August through 20 October 2022.

The Arctic and Antarctic Regional Masks for Sea Ice and Related Data 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 product is a set of polar ocean region masks. The masks have been developed primarily to support sea ice products, but they are potentially useful for other applications.

The Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 4 data set will be retired from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) on 28 February 2023. Access to the data will no longer be available, but the data set documentation will remain available for future reference.