| 西风爆发、次表层暖水东移与厄尔尼诺现象 |
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| 引用本文： | 陈幸荣,王彰贵.西风爆发、次表层暖水东移与厄尔尼诺现象[J].海洋学报,2003,25(1):19-27. |
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| 作者姓名： | 陈幸荣 王彰贵 |
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| 作者单位： | 国家海洋环境预报中心, 北京, 100081 |
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| 基金项目： | 国家重点基础研究开发资助项目(G199043809). |
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| 摘 要： | 利用最近20 a的大气海洋资料,分析了厄尔尼诺事件与赤道太平洋西风异常以及赤道太平洋次表层海温之间的关系.结果表明,赤道西太平洋(5°S～5°N,120°～160°E)和赤道中东太平洋(5°S～5°N,160°E～160°W)西风异常都存在着与厄尔尼诺周期一致的年际变化,但前者还包含有显著的2～3个月季节内振荡.赤道西太平洋次表层冷暖水东移也呈现年和年际时间尺度的振荡周期.在厄尔尼诺发生前,赤道西太平洋次表层海水出现持续性增暖,赤道西太平洋西风异常频率加快,强度增强.随后赤道中太平洋(160°E～160°W)出现持续性(3个月以上)强西风异常(即西风爆发),并进一步向东扩展,同时次表层暖水沿着赤道波导东移到赤道东太平洋混合层,导致赤道东太平洋海表大面积异常增暖,形成一次厄尔尼诺现象.最后,模式模拟了1980～1984年赤道太平洋海温的变化,进一步证实了赤道纬向西风异常对暖水东移起着重要的作用.
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| 关 键 词： | 西风爆发 海洋次表层 暖水东移 厄尔尼诺 |
| 文章编号： | 0253-4193(2003)01-0019-09 |
| 收稿时间： | 2001/12/13 0:00:00 |
| 修稿时间： | 2001年12月13 |
Westerly anomaly, eastward propagation of the subsurface temperature anomaly and El Niño event |
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| CHEN Xing-rong and WANG Zhang-gui.Westerly anomaly, eastward propagation of the subsurface temperature anomaly and El Niño event[J].Acta Oceanologica Sinica (in Chinese),2003,25(1):19-27. |
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| Authors: | CHEN Xing-rong and WANG Zhang-gui |
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| Institution: | National Marine Environment Forecasting Center, Beijing 100081, China |
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| Abstract: | Atmosphere and ocean data in tropical Pacific Ocean from 1980 to 2002 and a numerical model are used to analyze the relationship among the evolution of El Niño, westerly anomaly in equatorial Pacific Ocean and subsurface temperature anomaly in equatorial Pacific Ocean.The results show both the westerly anomaly in western equatorial Pacific Ocean(5°S~5°N,120°~160°E)and in central equatorial Pacific Ocean(5°S~5°N, 160°E~160°W)have the same annual variation as El Niño period, but the former has obvious intraseasonal oscillation of 2~3 months.The subsurface temperature anomaly in the western equatorial Pacific Ocean also has the oscillation period of annual scale and interannual scale.Before El Niño events onset, the subsurface water in western equatorial Pacific Ocean continues to be warmer, and strength of westerly anomaly are enhanced and its frequency increases.When the continual(≥3 months)strong westerly anomaly(zonalwind stress anomaly≥0.1×10-5N/cm2)appear in the central Pacific Ocean (5°S~5°N, 160°E~160°W) and then propagate eastwardly, and at the same time the positive subsurface temperature anomaly propagate to the eastern equatorial Pacific Ocean by Kelvin wave along the thermocline, the massive surface become anomaly warmer than normal SST, then an El Niño event is formed.Finally, the response of subsurface temperature anomaly in the equatorial Pacific Ocean to the westerly anomaly in 1982/1983 El Niño event is well simulated by a Pacific Ocean model. |
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| Keywords: | westerly anomaly thermocline subsurface temperature anomaly El Nino event |
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