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中文摘要: 文章分析了1950年以来赤道南美沿岸海表温度变化特点，发现1999年以来，Nino1+2区海表
温度的年变化振幅呈增大趋势，使得赤道东太平洋东北地区每年出现周期性降温，这主要是
由秋季月平均ＳＳＴ最低值偏低造成，这种长时间持续偏低是1950年以来首次出现。进一步
的分析表明，近年来南美沿岸海表温度在秋季的周期性下降可能对ＥＮＳＯ暖事件发生产生
了影响，使得2002/2003ＥＮＳＯ暖事件成为20世纪50年代以来由冷事件向暖事件转换历时
最长的一次。
Abstract:Firstly, characteristics in the evolvement of SST in offshore of South
America since 1950 were studied. It was found that the trends of annual undulati
on amplitude of monthly mean SST in Nino 1+2 kept increasing since 1999, which c
aused seasonal drops of SST in northeastern tropical East Pacific. The minimums
of monthly mean SST obviously being lower than normal in autumn are the major ca
use, and such a situation kept for so long time that it does not come forth befo
re year 1950s. Further study reveals that seasonal drops of SST in offshore of S
o
uth America in autumn weakened the possibility of ENSO warm event, and made the
2002/2003 El Nino be an ENSO event which got through the longest time to transfo
rm from La Nina episode into El Nino episode since the 1950s.
keywords: the tropical Eastern Pacific SST ENSO Nino1+2region
文章编号： 中图分类号： 文献标志码：
基金项目:
| Author Name | Affiliation |
| Li Wei | Physics School, Peking University, Beijing 100871 National Climate Center |
| Zhai Panmao | National Climate Center |
引用文本：
李威,翟盘茂,2007.近年秋季南美沿岸海表温度周期性下降对ＥＮＳＯ事件的可能影响[J].气象,33(2):29-33.
Li Wei,Zhai Panmao,2007.The Impact of Seasonal Drops of SST in offshore along South America on ENSO Event in Autumn of Recent Years [J].Meteor Mon,33(2):29-33.
李威,翟盘茂,2007.近年秋季南美沿岸海表温度周期性下降对ＥＮＳＯ事件的可能影响[J].气象,33(2):29-33.
Li Wei,Zhai Panmao,2007.The Impact of Seasonal Drops of SST in offshore along South America on ENSO Event in Autumn of Recent Years [J].Meteor Mon,33(2):29-33.