Probabilistic Freeze-Thaw Record for the Northern Hemisphere, 2016-2020

Description

This dataset provides a probabilistic freeze/thaw (FT) data record from 2016 to 2020 for the Northern Hemisphere derived using a deep learning model (U-Net). The model was informed by satellite multi-frequency microwave brightness temperature retrievals from the NASA SMAP (Soil Moisture Active Passive) and JAXA AMSR2 (Advanced Microwave Scanning Radiometer 2) radiometers, and trained using daily soil temperature observations from Northern Hemisphere weather stations and global reanalysis data (ERA-5). Unlike other available FT data records that provide only a binary classification of frozen or non-frozen conditions, this product includes both binary FT and continuous variable estimates of the probability of thawed conditions. This product is designed to complement other established binary FT data records, including the NASA FT Earth System Data Record and SMAP Level 3 FT operational products, by providing a probabilistic FT variable with enhanced accuracy and sensitivity to near-surface (<=5 cm depth) soil FT condition. The data are provided in cloud optimized GeoTIFF (COG) format.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F2323
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/daacdata/above/Freeze_Thaw_NorthernHemisphere/
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/ABOVE/guides/Freeze_Thaw_NorthernHemisphere.html
21 ABoVE project site https://above.nasa.gov
33 Probabilistic Freeze-Thaw Record for the Northern Hemisphere, 2016-2020: Freeze_Thaw_NorthernHemisphere.pdf https://data.ornldaac.earthdata.nasa.gov/public/above/Freeze_Thaw_NorthernHemisphere/comp/Freeze_Thaw_NorthernHemisphere.pdf
22 Probability of thawed conditions for four selected days over the 2016 seasonal cycle. The probability of thawed conditions ranges from low (0) to high (1) and is lower at higher latitudes and upper elevations during early spring (March) and late fall (October) in the Northern Hemisphere. In contrast, the probability of thawed conditions is much greater during summer (August). https://daac.ornl.gov/ABOVE/guides/Freeze_Thaw_NorthernHemisphere_Fig1.jpg
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/2323

Tags

  • land-surface
  • cryosphere
  • frozen-ground
  • earth-science

Topics

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