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Tropical-extratropical climate interaction as revealed in idealized coupled climate model experiments

机译：理想耦合气候模型实验揭示的热带-热带气候相互作用

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摘要

Tropical-extratropical climate interactions are studied by idealized experiments with a prescribed 2℃ SST anomaly at different latitude bands in a coupled climate model. Instead of focusing on intrinsic climate variability, this work investigates the mean climate adjustment to remote external forcing. The extratropical impact on tropical climate can be as strong as the tropical impact on extratropical climate, with the remote sea surface temperature (SST) response being about half the magnitude of the imposed SST change in the forcing region. The equatorward impact of extratropical climate is accomplished by both the atmospheric bridge and the oceanic tunnel. About two-thirds of the tropical SST change comes from the atmospheric bridge, while the remaining one-third comes from the oceanic tunnel. The equatorial SST increase is first driven by the reduced latent heat flux and the weakened poleward surface Ekman transport, and then enhanced by the decrease in subtropical cells' strength and the equatorward sub-duction of warm anomalies. In contrast, the poleward impact of tropical climate is accomplished mainly by the atmospheric bridge, which is responsible for extratropical temperature changes in both the surface and subsurface. Sensitivity experiments also show the dominant role of the Southern Hemisphere oceans in the tropical climate change.
机译：通过理想化实验，在耦合气候模型中，以不同纬度带上规定的2℃SST异常为条件，对热带-热带气候相互作用进行了研究。这项工作没有关注固有的气候变异性，而是研究了平均气候调整以适应偏远的外部强迫。热带对热带气候的影响可能与热带对热带气候的影响一样强，偏远海面温度（SST）响应大约是强迫区域强加的SST变化幅度的一半。温带气候对赤道的影响是通过大气桥和海洋隧道来完成的。热带海表温度变化的大约三分之二来自大气桥，其余三分之一来自海洋隧道。赤道SST的增加首先是由潜热通量的减小和极向表面埃克曼输运的减弱所致，然后由亚热带单元强度的减小和暖异常的赤道向亚消减而增强。相反，热带气候对极地的影响主要是由大气桥来完成的，大气桥负责地表和地下的温带温度变化。敏感性实验还显示了南半球海洋在热带气候变化中的主导作用。

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  • 来源
    《Climate dynamics》 |2005年第8期|p.863-879|共17页
  • 作者

    Haijun Yang; Zhengyu Liu;

  • 作者单位

    Department of Atmospheric Science and Laboratory for Severe Storm and Flood Disasters, School of Physics, Peking University, 209 Chengfu Road, Beijing, China 100871;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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