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Proceedings Paper

Features of the large-scale circulation of the extremely heavy rain with severe floods over South China in June 2005 and its possible cause
Author(s): Lijuan Wang; Zhaoyong Guan; Chunhua Shi; Jiang Tao; Lianji Jin
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Paper Abstract

Based on NCAR/NCEP daily reanalysis, a study is performed of the circulation background for the South-China torrential rains leading to flash floods in June 2005 with the possible causes explored. Results show that a weak El Nino episode in 2004-2005 is the climate background of the flooding. Compared to the situation of the summer 2005, the apparent heat source (Q1) and the apparent vapor sink (Q2) are anomalously intense in the rainy period June 17~26 over the study region, with their high-value belts resembling the rainfall distribution and their centers roughly coincident with the rainfall cores. The anomalous heating source from the eastern coast of the Arabian Sea to the Bay of Bengal excites a high-level abnormal anticyclone to the northwest, making the south-Asian high intensified and westward of normal, during which China mainland is under the effect of an anomalous cyclonic circulation that keeps the south-Asian high from northward displacement, allowing it to stay in the south of the Tibetan plateau - South China, a situation that South China is situated in the rising area on the south side of upper-air westerly jets, making for the occurrence and maintenance of the intense rains, resulting in extensive flooding.

Paper Details

Date Published: 30 August 2008
PDF: 9 pages
Proc. SPIE 7083, Remote Sensing and Modeling of Ecosystems for Sustainability V, 70830S (30 August 2008); doi: 10.1117/12.791771
Show Author Affiliations
Lijuan Wang, Nanjing Univ. of Information Science & Technology (China)
Zhaoyong Guan, Nanjing Univ. of Information Science & Technology (China)
Chunhua Shi, Nanjing Univ. of Information Science & Technology (China)
Jiang Tao, Yangzhou Meteorological Bureau (China)
Lianji Jin, Nanjing Univ. of Information Science & Technology (China)

Published in SPIE Proceedings Vol. 7083:
Remote Sensing and Modeling of Ecosystems for Sustainability V
Wei Gao; Hao Wang, Editor(s)

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