NDLI: Preliminary evaluation of the afwa-nasa (ansa) blended snow-cover product over the lower great lakes region

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Preliminary evaluation of the afwa-nasa (ansa) blended snow-cover product over the lower great lakes region

Content Provider	NASA Technical Reports Server (NTRS)
Author	Foster, James L. Riggs, George A. Montesano, Paul M. Hall, Dorothy K. Kelly, Richard E. J.
Copyright Year	2009
Description	The Air Force Weather Agency (AFWA) - NASA (ANSA) blended-snow product utilizes EOS standard snow products from the Moderate-Resolution Imaging Spectroradiometer (MODIS) and the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) to map daily snow cover and snow-water equivalent (SWE) globally. We have compared ANSA-derived SWE. with SWE values calculated from snow depths reported at approx.1500 National Climatic Data Center (NCDC) coop stations in the Lower Great Lakes basin. Our preliminary results show that conversion of snow depth to SWE is very sensitive to the choice of snow density (we used either 0.2 or 03 as conversion factors). We found overall better agreement between the ANSA-derived SWE and the co-op station data when we use a snow density of 0.3 to convert the snow depths to SWE. In addition, we show that the ANSA underestimates SWE in densely-forested areas, using January and February 2008 ANSA and co-op data. Furthermore, apparent large SWE changes from one day to the next may be caused by thaw-re-freeze events, and do not always represent a real change in SWE. In the near future we will continue the analysis in the 2006-07 and 2007-08 snow seasons.
File Size	1159856
Page Count	4
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110005681
Archival Resource Key	ark:/13960/t9k40s43p
Language	English
Publisher Date	2009-06-07
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Imaging Spectrometers Microwave Radiometers Water Climatology Great Lakes North America Modis Radiometry Snow Cover Freezing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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