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Global Change Master Directory (GCMD)
Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow Depth, Version 1
Entry ID: NSIDC-0024_1


Summary
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

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Geographic Coverage
 N: 85.0 S: 0.0  E: 180.0  W: -180.0
 N: 0.0 S: -85.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Title: Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow Depth, Version 1
Dataset Publisher: NASA National Snow and Ice Data Center Distributed Active Archive Center
Version: 1


Temporal Coverage
Start Date: 1978-11-01
Stop Date: 1987-08-31


Location Keywords
CONTINENT > SOUTH AMERICA
GEOGRAPHIC REGION > POLAR
CONTINENT > NORTH AMERICA
GEOGRAPHIC REGION > GLOBAL
CONTINENT > EUROPE
CONTINENT > ASIA
CONTINENT > ANTARCTICA


Science Keywords
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW COVER    [Definition]
CRYOSPHERE >SNOW/ICE >SNOW COVER    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >SNOW DEPTH    [Definition]
CRYOSPHERE >SNOW/ICE >SNOW DEPTH    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
Nimbus-7    [Information]


Instrument
SMMR >Scanning Multichannel Microwave Radiometer    [Information]


Data Set Progress
COMPLETE


Data Center
National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NOT PROVIDED

National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NOT PROVIDED


Personnel
NASA NATIONAL SNOW AND ICE DATA CENTER DISTRIBUTED ACTIVE ARCHIVE CENTER
Role: DATA CENTER CONTACT
City: Boulder
Province or State: Colorado
Country: USA


ALFRED T.C. CHANG
Role: TECHNICAL CONTACT
Phone: 1 301 614 5766
Fax: 1 301 614 5808
Email: achang at rainfall.gsfc.nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
Code 974.0
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: 1 303 492 6199
Fax: 1 303 492 2468
Email: nsidc at nsidc.org
Contact Address:
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


ALFRED T.C. CHANG
Role: TECHNICAL CONTACT
Phone: 1 301 614 5766
Fax: 1 301 614 5808
Email: achang at rainfall.gsfc.nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
Code 974.0
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771


Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-06-11
Last DIF Revision Date: 2019-04-16



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