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V02227
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Ref :
V02227
Theme :
Looking at Earth - Mountains - Hills - Snow - Ice
(539 images)
Title :
AMSR-E measures sea ice extents
Caption :
This NASA's satellite, launched on May 4, is dedicated to advancing our understanding of the Earth's water cycle, and has recently been used to obtain images of the sea ice covers of both polar regions, showing their changes from the June 2-4 period to the July 21-22 period.In these images, white indicates the area of sea ice cover and gray indicates land. Because of the time period covered (late spring to summer in the Northern Hemisphere, late fall to winter in the Southern Hemisphere), the area of the ice cover in the Arctic region is decreasing while the area of ice cover in the Antarctic region is increasing, a fact captured very well in the AMSR-E images. Annually, sea ice cover in the Arctic tends to decrease from March through September, then to increase, while sea ice cover in the Antarctic tends to increase from February through September, then to decrease. The presence of sea ice in the polar regions influences the balance of global heat and radiation, as it restricts heat exchanges between the ocean and atmosphere and reflects much of the solar radiation that reaches it.
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