Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow DepthEntry ID: NSIDC-0024
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.
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Data Set Citation
Dataset Originator/Creator: Chang, A. T.C.
Dataset Title: Nimbus-7 SMMR Derived Monthly Global Snow Cover and Snow Depth
Dataset Release Date: 2003-06-11
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data CenterOnline Resource: http://nsidc.org/data/nsidc-0024.html
Start Date: 1978-11-01Stop Date: 1987-08-31
Data Set Progress
Distribution Media: FTP
Distribution Format: IMG
Distribution Media: FTP
Distribution Format: Binary
Phone: (301) 614-5766
Fax: (301) 614-5808
Email: achang at rainfall.gsfc.nasa.gov
Laboratory for Hydrospheric Processes Code 974.0 NASA Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
National Snow and Ice Data Center CIRES, 449 UCB University of Colorado
Province or State: CO
Postal Code: 80309-0449
Chang, A.T.C., J. L. Foster, and D.K. Hall. 1987. Nimbus-7 SMMR derived global snow cover parameters. Annals of Glaciology. 9:39-44.
Foster, J.L., D.K. Hall, and A.T.C. Chang. 1987. Remote sensing of snow. Eos, Transactions of the AGU. 68(32):681-684.
Hall, D.K. 1988. Assessment of polar climate change using satellite technology. Reviews of Geophysics, 26(1):26-39.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-06-11
Last DIF Revision Date: 2013-08-14