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Processes Leading to Second-Year Cooling of the 2010–12 La Ni?a Event,Diagnosed Using godas

Advances in Atmospheric Sciences 2015年第3期32卷 424-438页

作者： FENG Licheng ZHANG Rong-Hua WANG Zhanggui CHEN Xingrong National Marine Environmental Forecasting Center State Oceanic Administration Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences Earth System Science Interdisciplinary Center (ESSIC) University of MarylandCollege ParkMaryland USA 20740

Isopycnal analyses were performed on the Global Ocean Data Assimilation System （godas） to determine the oceanic processes leading to so-called second-year cooling of the La Nina *** 2010-12,a horseshoe-like pattern was seen,connecting negative temperature anomalies off and on the Equator,with a dominant influence from the South *** the 2010 La Nina event,warm waters piled up at subsurface depths in the western tropical *** in early 2011,these warm subsurface anomalies propagated along the Equator toward the eastern basin,acting to reverse the sign of sea surface temperature （SST） anomalies （SSTAs） there and initiate a warm ***,throughout early 2011,pronounced negative anomalies persisted off the Equator in the subsurface depths of the South *** isopycnal surfaces outcropped in the central equatorial Pacific,negative anomalies from the subsurface spread upward along with mean circulation pathways,naturally initializing a cold *** the summer,a cold SSTA reappeared in the central basin,which subsequently strengthened due to the off-equatorial effects mostly in the South *** SSTAs acted to initiate local coupled air-sea interactions,generating atmospheric-oceanic anomalies that developed and evolved with the second-year cooling in the fall of ***,the cooling tendency in mid-2012 did not develop into another La Nina event,since the cold anomalies in the South Pacific were not strong *** analysis of the 2007-09 La Nina event revealed similar processes to the 2010-12 La Nina event.

关键词： La Ni(n)a second-year cooling off-equatorial effects isopycnal analyses circulation pathways godas

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