Snow Cover over the Northern Hemisphere during the Winter of 2002-2003 (WMS)
- Author:
- Cindy Starr, Dorothy Hall, Eric Sokolowsky
- Subject:
- Science and Technology
- Institution Name:
- NASA
- Collection:
- NASA GSFC Scientific Visualization Studio
- Grade Level:
- Secondary, Post-secondary
- Abstract:
The amount of snow covering the land has both short and long term effects on the environment. From season to season, snow coverage and depth affect soil moisture and water availability, which directly influence agriculture, wildfire occurrences, and drought. In the long term, the part of the Earths surface covered by snow reflects up to 80 or 90 percent of the incoming solar radiation as opposed to the 10 or 20 percent that uncovered land reflects, and this has important consequences for the Earths climate. Satellites identify the snow cover precisely by looking at the difference between light reflected off snow in the visible and the infrared wavelengths. This visualization shows the snow cover in the Northern Hemisphere from September, 2002, through June, 2003, as measured by the MODIS instrument on the Terra satellite. Since this instrument cannot measure snow cover through clouds, this visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than 50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. It is possible to see topographic features in the snow cover such as the Rocky Mountains and the Himalayas, and large snow coverage paths from storms that cross the plains of the United States and Russia can also be seen.
- Course Type:
- Learning Module
- Languages:
- English
- Material Type:
- Other
- Media Format:
- Graphics/Photos, Text/HTML, Video
- Technical Requirements:
- Real player
- Conditions of Use:
-
Public Domain
Please give credit to NASA GSFC Scientific Visualization Studio
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