Impact of the thermal contrast between the Arabian Sea and the Iranian Plateau on the interannual variability of the East Asian summer monsoon

Lin Wang, Zhihao Wang, Jie Cao, Yimin Liu, Dongxiao Wang, YT Leung
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Abstract

The land–sea thermal contrast is known to have a significant impact on the atmospheric circulation. We investigated the influence of the thermal contrast between the Arabian Sea and the Iranian Plateau on the interannual variability of the East Asian summer monsoon. When the apparent heat over the Arabian Sea (Iranian Plateau) is higher (lower) than normal, summer rainfall is abundant over the mid- and lower reaches of the Yangtze River and Japan with the adjacent maritime regions. By contrast, there is lower rainfall in North China and the coastal regions of South China. We attribute this phenomenon to the propagation of mid-latitude Rossby waves, which play a crucial role in regulating the atmospheric circulations on East Asia and the Northwest Pacific. Significant anomalies in the transport of water vapor were seen in our statistical analyses and were partly reproduced by the Linear Baroclinic Model and Weather Research and Forecasting model experiments. The anticipated outcomes of this research will help to identify another factor related to the variability of the East Asian summer monsoon, and provide a scientific basis for understanding the distribution and interaction of thermal anomalies on the plateau system and the Indian Ocean.
阿拉伯海与伊朗高原之间的热对比对东亚夏季季风年际变化的影响
众所周知,陆海热对比对大气环流有重大影响。我们研究了阿拉伯海与伊朗高原之间的热对比对东亚夏季季风年际变化的影响。当阿拉伯海(伊朗高原)上空的表观热量高于(低于)正常值时,长江中下游和日本与邻近海区的夏季降雨量丰富。相比之下,华北和华南沿海地区降雨较少。我们将这一现象归因于中纬度罗斯比波的传播,而罗斯比波对东亚和西北太平洋的大气环流起着至关重要的调节作用。我们在统计分析中发现了水汽输送的显著异常,线性巴洛克模式和天气研究与预报模式实验也部分再现了这一现象。这项研究的预期成果将有助于确定与东亚夏季季风变化有关的另一个因素,并为了解高原系统和印度洋热异常的分布和相互作用提供科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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