PIA00824: TOPEX/El Niņo Watch - El Niņo Moisture in the Atmosphere, January and February, 1998
 Target Name:  Earth
 Is a satellite of:  Sol (our sun)
 Mission:  Terra
 Spacecraft:  Upper Atmosphere Research Satellite (UARS)
 Instrument:  MLS
 Product Size:  2550 x 3300 pixels (w x h)
 Produced By:  JPL
 Producer ID:  P49651B
 Addition Date:  1998-03-26
 Full-Res TIFF:  PIA00824.tif (3.821 MB)
 Full-Res JPEG:  PIA00824.jpg (655.2 kB)

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This series of six images shows the evolution of atmospheric water vapor over the Pacific Ocean during the 1998 El Niņo condition. Higher than normal ocean water temperatures increase the rate of evaporation, and the resulting warm moist air rises into the atmosphere, altering global weather patterns. Data obtained by the Microwave Limb Sounder (MLS) on NASA's Upper Atmosphere Research Satellite (UARS) during January and February 1998 show a decrease in the extent of high levels of water vapor (red) over the eastern equatorial Pacific and an increase in water vapor (yellow to red) over the northwestern Pacific off the coast of Japan. This area is a breeding ground for winter storms that move eastward toward North America. During this El Niņo condition, the southern tropical jet stream has shifted northward, bringing additional moisture from the tropics. When these two sources of moisture converge near California, they produce storms with higher-than-normal rainfall.

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