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    • Trends of Thermal, Wetness, and Vegetative Change in the Circumpolar Arctic

    Metadata Updated: March 28, 2024

    This dataset provides estimates of trends in temperature, moisture, and vegetation changes over the circumpolar Arctic. Time series trends were measured by the Theil-Sen slope and associated p-values for a variety of variables including 2-meter air temperature, precipitation, soil moisture, non-frozen season days, permafrost active layer thickness, snow cover, vapor pressure deficit, land surface water fraction, normalized difference vegetation index (NDVI), and vegetation optical depth. Trends were measured annually and over specific seasons of spring (March to May), summer (June to August), autumn (September to November) and winter (December to February), and for the 1980-2020 and 1997-2020 time periods, depending on the variable and original data availability. Emerging hotspots of change were identified for the same variables and seasons, but only over the 1997-2020 period. In addition, a multivariate ranking was used to create combined hotspot layers to show areas of substantial changes in the thermal environment, moisture, and vegetation; these themes reflect landscape changes considered to be detrimental (e.g., a threat) to ecosystems and human populations. Ancillary files provide the boundaries of study regions, Brown permafrost regions, and a land cover product. The data are provided in cloud optimized GeoTIFF (COG) and shapefile formats.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date March 28, 2024
    Metadata Updated Date March 28, 2024

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Multivariate change hotspot maps for the 1997 to 2020 period, according to select directional changes in thermal, moisture, and vegetation indicators. Thermal indicator includes: average increase in annual air temperature (AT, degrees C); increase in annual non-frozen season (NFS, days); and increase in annual active layer thickness (ALT, m). Moisture indicator includes: decrease in annual precipitation (PPT, mm); increase in annual vapor pressure deficit (VPD, kPa); and a decrease in annual non-frozen season soil moisture (SM, cm3 cm-3). Panels (a) and (b) show identified change based on pixel-level analyses; (d) and (e) show indicator change across individual ecoregions.

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date March 28, 2024
    Metadata Updated Date March 28, 2024
    Publisher ORNL_DAAC
    Maintainer
    Identifier C2883645605-ORNL_CLOUD
    Data First Published 2024-02-29
    Language en-US
    Data Last Modified 2024-03-02
    Category ABoVE, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation Watts, J.D., S. Potter, B.M. Rogers, A-M. Virkkala, G. Fiske, K. Arndt, A. Burrell, S. Natali, K. Butler, B. Gerlt, J. Grayson, T.A. Shestakova, J. Du, and Y. Kim. 2023. Trends of Thermal, Wetness, and Vegetative Change in the Circumpolar Arctic. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2322
    Graphic Preview Description Multivariate change hotspot maps for the 1997 to 2020 period, according to select directional changes in thermal, moisture, and vegetation indicators. Thermal indicator includes: average increase in annual air temperature (AT, degrees C); increase in annual non-frozen season (NFS, days); and increase in annual active layer thickness (ALT, m). Moisture indicator includes: decrease in annual precipitation (PPT, mm); increase in annual vapor pressure deficit (VPD, kPa); and a decrease in annual non-frozen season soil moisture (SM, cm3 cm-3). Panels (a) and (b) show identified change based on pixel-level analyses; (d) and (e) show indicator change across individual ecoregions.
    Graphic Preview File https://daac.ornl.gov/ABOVE/guides/CircumArctic_Trends_Hotspots_Fig1.jpg
    Harvest Object Id 7ab46a8d-ef06-43a7-80d1-5f58710185af
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.3334/ORNLDAAC/2322
    Metadata Type geospatial
    Old Spatial -180.0 30.0 180.0 90.0
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash d9e3d21db5a1ae840c4530eea702d7199088e8eaecb6d29f5e74367ec72af70d
    Source Schema Version 1.1
    Spatial
    Temporal 1980-01-01T00:00:01Z/2020-12-31T23:59:59Z

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