10 September 2008 Circulation background of the extremely heavy rain causing severe floods in Huaihe River valley in 2003 and its relationship to the apparent heating
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Abstract
Based on NCEP/NCAR daily reanalysis data and precipitation data, the circulation background of the extremely heavy rain causing severe floods in Huaihe River valley (HHRV) in 2003 and its relationships to the apparent heating were analyzed. The results showed that the El Nino events with middling intensity during 2002~2003 was the previous background of this extremely heavy rain. The abnormal apparent heating source (Q1) and vapor sink (Q2) may be one of the important causes for subtropical high maintaining southward than usual. Compared with summer in 2003, the positive abnormal (Q1) and (Q2) were located to the HHRV during June 21~July 22. The centers of high value bands of (Q1) and (Q2) were in agreement with those of rainfall. But the negative abnormal (Q1) and (Q2) were situated in South China and most of South China Sea areas. The abnormal heating source over the Bay of Bengal forced an abnormal anticyclonic circulation over its northwest high level leading to the South Asian High enhancing and maintaining over the Tibetan Plateau, the south of Yangtze River valley and South China, so HHRV areas just located the updraft areas which was in the south of the high-level jet, making for heavy rain and severe floods.
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Lijuan Wang, Lijuan Wang, Zhaoyong Guan, Zhaoyong Guan, Chunhua Shi, Chunhua Shi, Lianji Jin, Lianji Jin, Jiaqing Ma, Jiaqing Ma, } "Circulation background of the extremely heavy rain causing severe floods in Huaihe River valley in 2003 and its relationship to the apparent heating", Proc. SPIE 7085, Atmospheric and Environmental Remote Sensing Data Processing and Utilization IV: Readiness for GEOSS II, 70851B (10 September 2008); doi: 10.1117/12.792340; https://doi.org/10.1117/12.792340
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