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Global Daily Snow and Sea Ice Surface Temperature
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This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over the Northern Hemisphere from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. 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. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a grey cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in landcover.
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This animation shows the daily advance and retreat of snow cover, and sea ice surface temperature over the Northern Hemisphere during the winter of 2002-2003. Snow cover over the tip of South America is also shown during the summer of 2000.
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MPEG-1
31 MB
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MPEG-2
515 MB
720 x 400
MPEG-1
121 MB
Download the frames here.
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This color bar shows the colors used to represent the sea ice surface temperature. The coldest water is shown in light blue. The warmest sea ice is shown in shades of pink. As the sea ice surface temperatures cool
below -15 degrees Celsius, the color is shown in shades of purple. The sea ice
surface below -28 degrees Celsius is shown in shades of blue/grey.
View the image:
640 x 480
TIFF
1 MB
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This image shows the snow cover and sea ice surface temperature on March 15, 2003.
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2560 x1920
TIFF
6 MB
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Studio: SVS
Date Completed: September 10, 2004
Duration: 6812 frames,
227.06 seconds
Scientist: Dorothy Hall (NASA/GSFC)
Instrument: Terra/MODIS, Aqua/MODIS, SeaStar/SeaWiFS
Datasets: MOD10C1 - Daily Snow Cover Extent, MYD29E1D - MODIS Sea Ice Surface Temperature,SeaWiFS Monthly Land Reflectance
Keywords: Snow Cover, Sea Ice Surface Temperature, HDTV
DLESESubject: Cryology
Data Collected: 2002/07/01 - 2003/05/31, 2000/05/01 - 2000/10/31
Animation Series: Modis Daily Snow and Sea Ice Temperature 2002-2003
Please give credit for this visualization to NASA/Goddard Space Flight Center
Scientific Visualization Studio
Additional Credit is given to George Riggs (NASA/SSAI)
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