January 21, 2012
Repeating La Niña Hitting Its Peak: NASA
La NiÃ±a, "the diva of drought," is peaking, increasing the odds that the Pacific Northwest will have more stormy weather this winter and spring, while the southwestern and southern United States will be dry.
Sea surface height data from NASA's Jason-1 and -2 satellites show that the milder repeat of last year's strong La NiÃ±a has recently intensified, as seen in the latest Jason-2 image of the Pacific Ocean shown above.The image is based on the average of 10 days of data centered on Jan. 8, 2012. It depicts places where the Pacific sea surface height is higher than normal (due to warm water) as yellow and red, while places where the sea surface is lower than normal (due to cool water) are shown in blues and purples. Green indicates near-normal conditions. The height of the sea surface over a given area is an indicator of ocean temperature and other factors that influence climate.
This is the second consecutive year that the Jason altimetric satellites have measured lower-than-normal sea surface heights in the equatorial Pacific and unusually high sea surface heights in the western Pacific.
"Conditions are ripe for a stormy, wet winter in the Pacific Northwest and a dry, relatively rainless winter in Southern California, the Southwest and the southern tier of the United States," says climatologist Bill Patzert of JPL. "After more than a decade of mostly dry years on the Colorado River watershed and in the American Southwest, and only two normal rain years in the past six years in Southern California, low water supplies are lurking. This La NiÃ±a could deepen the drought in the already parched Southwest and could also worsen conditions that have fueled recent deadly wildfires."
NASA will continue to monitor this latest La NiÃ±a to see whether it has reached its expected winter peak or continues to strengthen. A repeat of La NiÃ±a ocean conditions from one year to the next is not uncommon: repeating La NiÃ±as occurred most recently in 1973-74-75, 1998-99-2000 and in 2007-08-09. Repeating La NiÃ±as most often follow an El NiÃ±o episode and are essentially the opposite of El NiÃ±o conditions. During a La NiÃ±a episode, trade winds are stronger than normal, and the cold water that normally exists along the coast of South America extends to the central equatorial Pacific.
La NiÃ±a episodes change global weather patterns and are associated with less moisture in the air over cooler ocean waters. This results in less rain along the coasts of North and South America and along the equator, and more rain in the far Western Pacific.
The comings and goings of El NiÃ±o and La NiÃ±a are part of a long-term, evolving state of global climate, for which measurements of sea surface height are a key indicator. Jason-1 is a joint effort between NASA and the French Space Agency, Centre National d'Ãtudes Spatiales (CNES). Jason-2 is a joint effort between NASA, the National Oceanic and Atmospheric Administration, CNES and the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). JPL manages the U.S. portion of both missions for NASA's Science Mission Directorate, Washington, D.C.
Image Caption: The latest image of sea surface heights in the Pacific Ocean from NASA´s Jason-2 satellite shows that the current La NiÃ±a is peaking in intensity. Yellows and reds indicate areas where sea surface height is higher than normal (due to warm water), while blues and purples depict areas where sea surface height is lower than normal (due to cool water). Green indicates near-normal conditions. Image credit: NASA/JPL Ocean Surface Topography Team
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