ENSO循环过程中逐月海温异常的合成分析

COMPOSITE ANALYSES OF MONTHLY SEA SURFACE TEMPERATURE ANOMALIES ASSOCIATEDWITH THE ENSO CYCLE

文章基于ＵＫ和ＭＩＴ１９９０年整编的１２年（１９６８～１９７７年和１９８２～１９８３年）逐月５°×５°经纬网格点的海温（ＳＳＴ）距平资料，对其间发生的４次ＥＩＮｉｎｏ事件和３次ＬａＮｉｎａ事件作了逐月全球ＳＳＴ异常分布的合成分析．合成结果表明：在ＥＩＮｉｎｏ事件的形成阶段，赤道中太平洋存在明显的东传暖性低频扰动；而在ＬａＮｉｎａ事件的形成阶段，南北美沿岸有稳定增强的冷中心向西发展．

Based on 5°× 5°latitude-longitude grid SST departure data,which was edited by UK and MIT in 1990 for the years of 1968￣1977 and 1982￣1983,the monthly global SST departure composite analyses for four EI Nino events and three La Nina events during the two periods have been conducted.The results show that some warming low-frequency fluctuation centers travel obviously eastward along the equator during onset phase of EI Nino event,while some stable strengthening cold centers extend westward along the Pacific coast of South-North America during onset phase of La Nina event.