Data Announcements

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 5 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; geolocated surface elevations for land ice, sea ice, land and vegetation; atmospheric layer characteristics; and sea ice freeboard estimates. The temporal coverage of each data set is included below.

The AMSR-E/Aqua L2B Global Swath Surface Precipitation GSFC Profiling Algorithm, Version 4 data set accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is now available. The data have been reprocessed using version 4 of the AMSR-E Level-2A Brightness temperatures as input data and the GPROF 2017 algorithm. Eight variables were removed and three have been added, and the names for some of the remaining variables have changed slightly.

NOAA@NSIDC is pleased to announce that the Climate Data Record of Passive Microwave Sea Ice Concentration, Version 4 data set has been updated to include the time period of 01 January 2021 through 31 May 2021.

The MEaSUREs Greenland 6 and 12 day Ice Sheet Velocity Mosaics from SAR, Version 1 data set is now available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains 6- and 12-day surface velocity estimates for the Greenland Ice Sheet and periphery derived from images acquired between 2015-2021 by the European Space Agency (ESA) Sentinel-1A and Sentinel-1B satellites.

The IceBridge ARES L1B Geolocated Radar Echo Strength Profiles, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include data for the Spring 2021 Alaska campaign from 2 May 2021 through 12 May 2021. This data set contains radar echograms acquired by the Arizona Radio-Echo Sounder (ARES) over select glaciers in Alaska. The data are provided in HDF5 formatted files, which include important metadata for interpreting the data.

The IceBridge Snow Radar L1B Geolocated Radar Echo Strength Profiles, Version 2 data set has been updated to include data for campaigns in 2017, 2018, 2019 and 2021 at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

A software issue at the SMAP Science Data System (SDS) has been impacting the latency of all SMAP products. Due to the software issue, SMAP products cannot be produced automatically; production must be started manually. The patch to fix this issue will be delivered sometime within the next month. In the meantime, the SDS team will manually run the SMAP production code. Users will be able to access all new files as NSIDC ingests them. However, new data may be delayed. Users should not expect data to be delivered at their typical frequency.

The SMAP Project performs annual reprocessing of all its science data products based on improvements in the algorithms and supporting information. As part of this routine reprocessing, the SMAP Science Data System (SDS) has now released new versions of the following four Level-2 and -3 data products, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC): SMAP L2 Radiometer Half-Orbit 36km EASE-Grid Soil Moisture, Version 8 

SnowEx20 Grand Mesa Reference GIS Data Sets, Version 1 are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This product contains geolocation information for the scientific infrastructure for the SnowEx20 Intensive Observation Period (IOP) and Time Series (TS) campaigns over the time period 21 September 2019 to 14 February 2020.

The MEaSUREs Annual Greenland Outlet Glacier Terminus Positions from SAR Mosaics, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is now available. New data have been added so the data set now spans winter seasons from 2000 to 2021. Gaps in the mosaic coverage throughout the data record have been filled in using Landsat-7 and -8 imagery, so every winter season now contains terminus locations for every glacier.

The Terra flight operations team conducted Terra’s last inclination adjust maneuver to maintain Terra’s orbit in February 2020. The inclination adjust maneuvers were used to control the platform’s 10:30 AM mean local time (MLT) equator crossing. Terra will continue to drift and is expected to reach a 10:15 AM MLT in October 2022.

The following data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated with new data for the following time ranges: MEaSUREs Greenland Quarterly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 3 01 December 2020 to 31 May 2021 MEaSUREs Greenland Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 3 01 December 2020 to 31 May 2021

NSIDC is pleased to announce the release of a new data set, Inventory of Arctic Rain on Snow Events: Meteorological and Surface Conditions, Version 1.

The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 6 data, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated with corrected data for 2021. A data processing error was discovered that caused the sporadic exclusion of F17 data, F18 data, or both from files starting on 1 January 2021 through 5 June 2021. These corrected files are now available for download. We apologize for any inconvenience caused by this error.

The High Mountain Asia Annual 90m Glacier Surface Melt/Freeze Phenology from SAR Imagery, 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 annual surface melt onset and freeze onset dates across all glaciers in the Hindu Kush Himalayas (HKH) retrieved from time series synthetic aperture radar (SAR) imagery.

NOAA@NSIDC is pleased to announce the release of the Rutgers Northern Hemisphere 24 km Weekly Snow Cover Extent, September 1980 Onward data set. This data set provides weekly snow cover extent at a 24 km resolution for the Northern Hemisphere from September 1980 in NetCDF format. The time series currently goes to September 2021 but will be updated on an annual basis every September.

NOAA@NSIDC is pleased to announce that the 2021 ice season data is now available from the Daily Great Lakes Ice Concentration, 1973 Onward data set. The new data span 22 November 2020 through 29 April 2021. This data set consists of daily gridded lake ice concentration for the Laurentian Great Lakes from the NOAA Great Lakes Environmental Research Laboratory (GLERL). The data are provided as gridded ASCII text files along with corresponding browse image files in .jpg format.

The SnowEx20 Grand Mesa Autumn 2019 Snow Pits, 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 snow pit measurements obtained during the SnowEx 2020 campaign at the Grand Mesa, Colorado, USA site in Autumn 2019. Twenty-one snow pit locations were visited during the period 04 November 2019 – 06 November 2019. Some snow pit measurements are incomplete due to shallow or discontinuous snow cover.

It was discovered that data from the MODIS/[Terra/Aqua] CGF Snow Cover Daily L3 Global 500m SIN Grid, Version 61 products, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), for the month of January 2019 were produced without the necessary spin-up phase that ensures the stability of the algorithm. The files from 01 January 2019 through 31 January 2019 will be replaced once reprocessed, and in the meantime data for this period will be missing.

The IceBridge MCoRDS L1B Geolocated Radar Echo Strength Profiles, Version 2 and IceBridge MCoRDS L2 Ice Thickness, Version 1 data sets at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) have been updated to include data from the Spring 2018 Arctic campaign.  These data were acquired using the University of Kansas Center for Remote Sensing of Ice Sheets (CReSIS) Multichannel Coherent Radar Depth Sounder (MCoRDS).