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Theoretical and Applied Climatology

, Volume 137, Issue 3–4, pp 2335–2349 | Cite as

The relationship between heavy precipitation in the eastern region of China and atmospheric heating anomalies over the Tibetan Plateau and its surrounding areas

  • Xiaohui ShiEmail author
  • Jinqiu Chen
  • Min Wen
Original Paper
  • 111 Downloads

Abstract

The relationships among heavy precipitation in the eastern region of China, the atmospheric heat source over the Tibetan Plateau and its surrounding areas, and atmospheric circulation in East Asia were investigated using the multi-variate empirical orthogonal function (MV-EOF) method and synthetic analysis on daily meteorological data from May through August 2010, which were compared with data from 2013. The MV-EOF decomposition results revealed that the atmospheric heating over the eastern region of the Tibetan Plateau and the Bay of Bengal exhibited opposite trends when heavy precipitation events occurred in South China, West China, and the middle and lower reaches of the Yangtze River. These results indicated that the land–sea thermal contrast between the eastern region of the Tibetan Plateau and the Bay of Bengal was likely one of the key factors leading to the occurrence of heavy precipitation events in the eastern region of China. The results of the synthetic analysis revealed a possible physical mechanism: When the atmospheric heating was weak over the Tibetan Plateau and strong over the Bay of Bengal, there was a strong ascending motion over the Bay of Bengal and its surrounding areas, which was conducive to maintaining the South Asian high and the western Pacific subtropical high (WPSH) in southerly positions. This also resulted in weak water vapor transport in the southwest, thus forming continuous heavy precipitation in South China. After the increase in atmospheric heating over the Tibetan Plateau, the convergence and ascending motion of the lower atmosphere were strengthened, and the South Asian high moved northward to the plateau, with a strengthened eastward extension. The WPSH then lifted northward, and the airflow around it conveyed more water vapor to West China and the middle and lower reaches of the Yangtze River, resulting in heavy precipitation in these regions.

Notes

Acknowledgments

We thank the National Meteorological Information Center of the China Meteorological Administration for providing the surface precipitation data (download address: http://data.cma.cn/data/cdcdetail/dataCode/SURF_CLI_CHN_PRE_DAY_GRID_0.5.html) from mainland China used in this study, the European Centre for Medium-Range Weather Forecasts for providing the ERA-Interim data downloaded from http://apps.ecmwf.int/datasets/, the National Natural Science Foundation of China (No. 41275050), and the Science and Technology Development Fund of the China Academy of Meteorological Sciences (No. 2018KJ032) for supporting this work. We would also like to thank the anonymous reviewers whose critical reviews and valuable suggestions were important to the improvement of the manuscript.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Chinese Academy of Meteorological SciencesBeijingChina

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