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Advances in Atmospheric Sciences

, Volume 36, Issue 3, pp 261–270 | Cite as

Seesaw Pattern of Rainfall Anomalies between the Tropical Western North Pacific and Central Southern China during Late Summer

  • Xinyu Li
  • Riyu LuEmail author
Original Paper

Abstract

It is well known that suppressed convection in the tropical western North Pacific (WNP) induces an anticyclonic anomaly, and this anticyclonic anomaly results in more rainfall along the East Asian rain band through more water vapor transport during summer, as well as early and middle summer. However, the present results indicate that during late summer (from mid-August to the beginning of September), the anomalous anticyclone leads to more rainfall over central southern China (CSC), a region quite different from preceding periods. The uniqueness of late summer is found to be related to the dramatic change in climatological monsoon flows: southerlies over southern China during early and middle summer but easterlies during late summer. Therefore, the anomalous anticyclone, which shows a southerly anomaly over southern China, enhances monsoonal southerlies and induces more rainfall along the rain band during early and middle summer. During late summer, however, the anomalous anticyclone reflects a complicated change in monsoon flows: it changes the path, rather than the intensity, of monsoon flows. Specifically, during late summers of suppressed convection in the tropical WNP, southerlies dominate from the South China Sea to southern China, and during late summers of enhanced convection, northeasterlies dominate from the East China Sea to southern China, causing more and less rainfall in CSC, respectively.

Key words

tropical western North Pacific monsoon flows precipitation late summer 

摘要

夏季热带西北太平洋弱对流异常激发西北太平洋反气旋异常,通过增加向东亚地区的水汽输送,使得东亚雨带降水增多,这种现象在夏季季节平均以及前夏和中夏都是成立的.但是,本文的研究表明,在后夏(8月中旬到9月初),反气旋异常所造成的降水异常主要位于我国中南部,降水异常的位置与前夏和中夏有显著的不同.后夏的这种特殊性与季风环流剧烈的次季节变化有关:前夏和中夏我国南部为南风,但在后夏转为东风.因此,与反气旋相联系的南风异常在前夏和中夏可以使得季风环流的南风加强,从而使东亚雨带降水增多.但在后夏,反气旋异常改变的是季风环流的路径,而非强度.具体来说,后夏热带西北太平洋对流偏弱时,南海和我国南部为南风控制,使得我国中南部降水增多.而热带西北太平洋对流偏强时,东海到我国南部区域为东北风控制,导致我国中南部降水减少.

关键词

热带西北太平洋 季风环流 降水 后夏 

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Notes

Acknowledgements

We thank the two anonymous reviewers for their comments, which were helpful in improving the presentation. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41721004 and 41320104007).

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.College of Earth and Planetary SciencesUniversity of the Chinese Academy of SciencesBeijingChina
  3. 3.College of OceanographyHohai UniversityNanjingChina

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