NSIDC-0024_1

Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow Depth, Version 1

Version 1 eng; usa
  • Abstract
    The data set consists of monthly global snow cover and snow depth derived from Nimbus-7 SMMR data for 1978 through 1987. The SMMR data are interpolated for spatial and temporal gaps, and averaged for display in polar stereographic projection. Maps are based on six-day average brightness temperature data from the middle week of each month. Data are placed into 1/2 degree latitude by 1/2 degree longitude grid cells uniformly subdividing a polar stereographic map according to the geographic coordinates of the center of the radiometers' fields of view. Overlapping data from separate orbits in the same six-day period are averaged to give a single brightness temperature assumed to be at the cell's center. Oceans and bays are masked so that only microwave data for land areas are displayed. Comparisons of SMMR snow cover maps with previous maps produced by NOAA/NESDIS and US Air Force Global Weather Center indicate that the total snow covered area derived from SMMR is usually about ten percent less than that measured by the earlier products, because passive microwave sensors often can't detect shallow dry snow less than about 5 cm deep. Snow depths are comparable, showing SMMR results to be especially good for uniform snow covered areas such as the Canadian high plains and Russian steppes. Heavily forested and mountainous areas tend to mask the microwave snow signatures, and SMMR snow depth derivations are less reliable in those areas. Formerly distributed by NASA/GSFC/NSSDC and NASA Pilot Land Data System (PLDS), these data are now available via ftp from NSIDC.
  • Purpose
    Scientific Research

Data Identification Fields:

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    Processing Level

    Level 3

    Quality
    Collection Progress

    Complete

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Snow Cover
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Snow Cover
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Snow Depth
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Snow/Ice
    • Snow Depth

Acquisition Information Fields:

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Platforms
  • Satellite
    NIMBUS-7
    Instruments
    • SMMR

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Continent
    • Antarctica
    • Continent
    • Asia
    • Continent
    • Europe
    • Geographic Region
    • Global
    • Continent
    • North America
    • Geographic Region
    • Polar
    • Continent
    • South America

Data Centers

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  • National Snow and Ice Data Center
    ARCHIVER

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • National Snow and Ice Data Center
    DISTRIBUTOR

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Data Contacts

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  • Alfred
    Technical Contact
    Alfred Chang

    Laboratory for Hydrospheric Processes
    Code 974.0
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • 1 301 614 5766
    • 1 301 614 5808
    • Email
  • Alfred
    Technical Contact
    Alfred Chang

    Laboratory for Hydrospheric Processes
    Code 974.0
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • 1 301 614 5766
    • 1 301 614 5808
    • Email
  • NASA National Snow and Ice Data Center Distributed Active Archive Center
    User Services
    NASA National Snow and Ice Data Center Distributed Active Archive Center

    Boulder, Colorado

    This contact does not have any contact mechanisms listed.

  • NSIDC
    Data Center Contact
    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • NSIDC
    Data Center Contact
    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Collection Citations Fields:

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    Collection Citations
    • Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow Depth, Version 1
      1

      Published by: NASA National Snow and Ice Data Center Distributed Active Archive Center