Editorial Type:
Article
Article Type:
Research Article

Interannual Variation of the South Asian High and Its Relation with Indian and East Asian Summer Monsoon Rainfall

Wei Wei State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, and University of Chinese Academy of Sciences, Beijing, China

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Renhe Zhang State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China, and National Institute of Meteorological Research, Korean Meteorological Administration, Jeju-do, South Korea

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Min Wen State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China

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Baek-Jo Kim National Institute of Meteorological Research, Korean Meteorological Administration, Jeju-do, South Korea

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Jae-Cheol Nam National Institute of Meteorological Research, Korean Meteorological Administration, Jeju-do, South Korea

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Print Publication:
01 Apr 2015
DOI:
https://doi.org/10.1175/JCLI-D-14-00454.1
Page(s):
2623–2634
Restricted access

Abstract

A diagnostic analysis reveals that on the interannual time scale the southeast–northwest movement is a dominant feature of the South Asian high (SAH), and it is closely related to the Indian and East Asian summer monsoon rainfall. The southeastward (northwestward) shift of the SAH is closely related to less (more) Indian summer monsoon rainfall and more (less) rainfall in the Yangtze River valley (YRV) over the East Asian summer monsoon region. An anomalous AGCM is utilized to examine the effect of latent heat anomalies associated with the Asian summer monsoon rainfall on the SAH. The negative latent heat anomalies over the northern Indian Subcontinent associated with a weak Indian summer monsoon stimulates an anomalous cyclone to its northwest and an anticyclone to its northeast over the eastern Tibetan Plateau and eastern China in the upper troposphere, which is responsible for the east–west shift of the SAH and more rainfall in the YRV. The positive latent heat release associated with rainfall anomalies in the YRV excites a southward-located anticyclone over eastern China, exerting a feedback effect on the SAH and leading to a southeast–northwest shift of the SAH.

Corresponding author address: Dr. Renhe Zhang, Chinese Academy of Meteorological Sciences, No. 46, Zhong-Guan-Cun South Ave., Haidian District, Beijing 100081, China. E-mail: renhe@cams.cma.gov.cn

Abstract

A diagnostic analysis reveals that on the interannual time scale the southeast–northwest movement is a dominant feature of the South Asian high (SAH), and it is closely related to the Indian and East Asian summer monsoon rainfall. The southeastward (northwestward) shift of the SAH is closely related to less (more) Indian summer monsoon rainfall and more (less) rainfall in the Yangtze River valley (YRV) over the East Asian summer monsoon region. An anomalous AGCM is utilized to examine the effect of latent heat anomalies associated with the Asian summer monsoon rainfall on the SAH. The negative latent heat anomalies over the northern Indian Subcontinent associated with a weak Indian summer monsoon stimulates an anomalous cyclone to its northwest and an anticyclone to its northeast over the eastern Tibetan Plateau and eastern China in the upper troposphere, which is responsible for the east–west shift of the SAH and more rainfall in the YRV. The positive latent heat release associated with rainfall anomalies in the YRV excites a southward-located anticyclone over eastern China, exerting a feedback effect on the SAH and leading to a southeast–northwest shift of the SAH.

Corresponding author address: Dr. Renhe Zhang, Chinese Academy of Meteorological Sciences, No. 46, Zhong-Guan-Cun South Ave., Haidian District, Beijing 100081, China. E-mail: renhe@cams.cma.gov.cn
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