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| South Asia High Anomaly Characteristic in Flood/Drought Years in Northwest China |
| Zhang Yu1, Li Yaohui1, Wang Shigong2, Liu Kang3 |
1. Key Laboratory of Arid Climate Change and Disaster Reducing of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. College of Atmospheric Sciences/Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Lanzhou University, Lanzhou 730020, China;
3. Gansu Provincial Meteorological Service Center, Lanzhou 730020, China |
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Abstract The South Asia High anomaly characteristic during different flood/drought years in Northwest China were analyzed in this study using the NCEP/NCAR reanalysis data and observation data from meteorological stations from January 1th of 1961 to December 31th of 2010. In March and April of typical severe drought years in northwest China, the South Asia High Center West was seen at about 40°. In typical drought years in Northwest China, the South Asia High centre moved to west from March to April, then retreated to east, moved to west from April to May, or South Asia High center moved to east about 40° in April. In typical flood years in Northwest China, the South Asia High oscillates between west and east. In typical rainy years in northwest China, the South Asia High center was located in the Bay of Bengal in May, the South Asia High moved to east in September, the South Asia High center moved to west about 40° in December. The most obvious characteristic of the South Asia High area anomaly was: in years of heavy drought and drought, area of the South Asia High was small, while area of the South Asia High was big in flood and rainy years. In heavy drought years, the anomaly characteristic of the South Asia High area was apparent in April. The correlation between strength/size of the South Asia High and precipitation in Northwest China was significant from February to April.
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Received: 26 March 2013
Published: 20 March 2014
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2014, Vol. 34 
