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Extreme Cold and Snow in Central Asia
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Published January 23, 2008
Afghanistan was one of many countries in southern and central Asia suffering through extreme cold and snow in January 2008. Most of the country was covered with snow when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this photo-like image on January 20.
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La Nina Rainfall Patterns
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La Niña, the counterpart to El Niño, alters rainfall patterns over the Pacific and Indian Ocean basins. La Niña develops when stronger-than-average trade winds push the warm surface waters of the equatorial Pacific west. Since cold water rises to replace the warm water, La Niña leaves the eastern and central Pacific Ocean much cooler than normal, while the western Pacific is much warmer than normal. These anomalies in sea surface temperature are mirrored in rainfall patterns, with warmer-than-normal temperatures resulting in enhanced rainfall. In general, La Niña brings unusually heavy rain to the West Pacific, Indonesia, parts of Southeast Asia, and northern Australia.
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Floods in Australia
Published January 22, 2008
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Dust Storm off Western Sahara
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Agricultural Fires in West Africa
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Fires in Southeast Asia
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MESSENGER Views Mercury, Sends Earth a Postcard
The spacecraft captured images of parts of Mercury’s surface that planetary scientists had never seen.
Great Sand Dunes National Park and Preserve, Colorado
Published January 21, 2008
The Sangre de Cristo Mountains of south-central Colorado stretch dramatically from top left to lower right of this astronaut photograph. The mountains are outlined by dark green forests at lower elevations and white, snow-capped peaks at the highest elevations. Dun-colored dunes are banked up on the west side of the mountains. These dunes make up the Great Sand Dunes National Park and Preserve.
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Kyushu, Japan
Published January 20, 2008
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Small Tropical Cyclones Contribute More to Annual Rainfall
Published January 19, 2008
Though relatively infrequent, tropical cyclones make a significant contribution to the seasonal accumulation of rainfall in the southeastern United States. In a recent study, Dr. Marshall Shepherd and collaborators at the University of Georgia found that tropical storm systems contribute an average of 13 percent of the total rainfall during the hurricane season.
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Dust Plumes over the Red Sea
Published January 18, 2008
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Ramsar Convention and Wetlands in Vietnam