NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC)
Data Updates
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
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.
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).
The SnowEx20 Grand Mesa Autumn 2019 Snow Depth, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). Snow depth was measured in autumn 2019 (04-07 November) as part of the NASA SnowEx 2020 campaign at Grand Mesa, CO. Measurements were taken in the vicinity of snow pit locations and between pit locations using a Magnaprobe or manual depth probes.
The SMAPVEX16 Manitoba In Situ Vegetation Data, Version 1 data set available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. The CSV file containing crop biomass data has been updated to include additional data from all sites. A geodatabase in compressed ZIP format, has also been added, containing tables and ancillary data, such as flight lines and the shapefiles for the study area.
The temporal coverage for the ICESat-2 L4 Monthly Gridded Sea Ice Thickness, Version 1 (IS2SITMOGR4) data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been extended to include data for September 2019 (supplementing the existing data for the 2019-2020 winter season), as well as September 2020 through April 2021. This data set reports monthly, gridded winter sea ice thickness across the Arctic Ocean.
The CALFIN Subseasonal Greenland Glacial Terminus Positions, 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 polyline and polygon shapefiles of glacial terminus positions in Greenland from 1972 to 2019. The temporal resolution is sub seasonal and the spatial resolution is approximately 30m. Shapefiles are available for individual glaciers and there are also shapefiles that contain all of the glaciers that were studied.
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 released through 5 June 2021.
The Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent (NISE) data set, available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), now includes data derived from all available Special Sensor Microwave Imager/Sounder (SSMIS) sensors. Version 5 of the NISE data set contains data from the F18 SSMIS sensor. The newly released data from the F16 and F17 will be provided in Version 3 and Version 4, respectively. Data from F16, F17, and F18 will all be updated in near-real-time as new data are processed.