地形与热源强迫下的南方涛动
Southern Oscillation forced by heat source and topography
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摘要: 用El Nino和La Nina位相时的海温异常和地形作为大气下垫面的异常强迫,引入IAP的两层原始方程大气环流模式,模拟出了南方涛动的典型结构.当去掉地形后,仅仅由海温异常也能模拟出太平洋东西部的气压异常振荡,但太平洋东部振荡中心的位置并不与观测的一致.由此可见,观测到的南方涛动是在实际地形下对全球海温异常的响应.Abstract: Firstly,this paper illustrates the global structure of the sea surface temperature CSST)anomalies associated with El Nino and La Nina events and the Southern Oscillation (SO) structure associated with the sea Level pressure (SLP) anomaly.Secondly, the typical structure of the SO forced by global ocean heat source and real topography was simulated by using IAP two-level atmospheric general circulation model.The simulated location of the SLP anomaly centers over the eastern Pacific differs significantly with the observations if only the SST heat source without topography was considered.It suggests that the SO may be a response to the global SST anomaly under the real topography.
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Key words:
- Southern Oscillation /
- topography /
- SST anomaly /
- numerical simulation
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