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    • ABoVE: Passive Microwave-derived Annual Snowpack Main Melt Onset Date Maps, 1988-2018

    Metadata Updated: May 6, 2024

    This dataset provides the annual date of snowpack seasonal beginning melt (i.e., main melt onset date, MMOD) across northwest Canada; Alaska, U.S.; and parts of far eastern Russia at 6.25 km resolution for the period 1988-2018. MMOD was derived from the daily 19V (K-band) and 37V (Ka-band) GHz bands from the Making Earth Science Data Records for Use in Research Environments (MEaSUREs) Calibrated Enhanced-Resolution Passive Microwave (PMW) EASE-Grid Brightness Temperature (Tb) Earth System Data Record (ESDR). The PMW MMOD dataset was validated using the transition date from Freeze Degree Days (FDD) to Thaw Degree Days (TDD) from in situ air temperature observations from 31 SNOw TELemetry network (SNOTEL) observations, and compared to the established Freeze-Thaw ESDR (FT-ESDR) spring onset date. The resulting MMOD data record is suitable for documenting the spatial-temporal impacts of MMOD variability in ecosystem services, wildlife movements, and hydrologic processes across the ABoVE domain. The data from 1988-2016 included a coastal mask removing coastal pixels due to potential water contamination from coarse brightness temperature observations (Dersken et al., 2012). There is not a coastal mask for the 2017-2018 data. The full data are included, and data users should be aware that coastal values can be adversely affected by adjacent water bodies.

    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 December 1, 2022
    Metadata Updated Date May 6, 2024

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Spatial extent of snowpack main melt onset dataset (MMOD) extending from the Russian Far East across Alaska into Canada's Northwest Territories and British Columbia. The map also includes the GRDC river gauging locations (blue diamonds) used at Eagle, Stevens Village, and Pilot basins (black outlines). Locations of river ice breakup observations (white circles), the World Meteorological Organization (WMO) stations (orange triangles), and SNOw TELemetry network (SNOTEL) stations (purple triangles) are shown. Source: Pan et al. (2021)

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date May 6, 2024
    Publisher ORNL_DAAC
    Maintainer
    Identifier C2143401742-ORNL_CLOUD
    Data First Published 2024-05-01
    Language en-US
    Data Last Modified 2024-05-02
    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 Pan, C.G., P.B. Kirchner, J.S. Kimball, and J. Du. 2021. ABoVE: Passive Microwave-derived Annual Snowpack Main Melt Onset Date Maps, 1988-2018. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1841
    Graphic Preview Description Spatial extent of snowpack main melt onset dataset (MMOD) extending from the Russian Far East across Alaska into Canadas Northwest Territories and British Columbia. The map also includes the GRDC river gauging locations (blue diamonds) used at Eagle, Stevens Village, and Pilot basins (black outlines). Locations of river ice breakup observations (white circles), the World Meteorological Organization (WMO) stations (orange triangles), and SNOw TELemetry network (SNOTEL) stations (purple triangles) are shown. Source: Pan et al. (2021)
    Graphic Preview File https://daac.ornl.gov/ABOVE/guides/Main_Melt_Onset_Dates_Fig1.jpg
    Harvest Object Id 89838b87-dd68-42e6-bb46-8b0c21e4c52b
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.3334/ORNLDAAC/1841
    Metadata Type geospatial
    Old Spatial -180.0 51.61 -107.83 72.41
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash e66be142e373056c8cdba86de153ce32a958643806b5706a47157f493743e055
    Source Schema Version 1.1
    Spatial
    Temporal 1988-02-09T00:00:00Z/2018-02-10T23:59:59Z

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