| 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 |
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| 引用本文： | 李威,翟盘茂.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,2007,33(2):29-33. |
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| 作者姓名： | 李威 翟盘茂 |
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| 作者单位： | 1. 北京大学物理学院,北京,100871;国家气候中心
2. 国家气候中心 |
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| 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ENS0暖事件发生产生了影响，使得2002／2003ENS0暖事件成为20世纪50年代以粜由玲事件向瞎事件转换历时最长的一次．
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| 关 键 词： | 赤道东太平洋 海表温度 Nino1 2区 |
| 修稿时间： | 2006-06-162006-12-29 |
The Impact of Seasonal Drops of SST in offshore along South America on ENSO Event in Autumn of Recent Years |
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| Li Wei and Zhai Panmao.The Impact of Seasonal Drops of SST in offshore along South America on ENSO Event in Autumn of Recent Years[J].Meteorological Monthly,2007,33(2):29-33. |
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| Authors: | Li Wei and Zhai Panmao |
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| Institution: | 1. Physics School, Peking University, Beijing 100871; 2. National Climate Center |
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| 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 undulation amplitude of monthly mean SST in Nino 1+2 region kept increasing since 1999, which caused seasonal drops of SST in northeastern tropical East Pacific. The minimums of monthly mean SST obviously lower than normal in autumn are the major cause, and such a situation kept for so long time that it does not come forth before year 1950. Further study reveals that seasonal drops of SST in offshore of South 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 transform from La Nina episode into El Nino episode since the 1950s. |
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| Keywords: | ENSO |
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