Title: Analysis on Atmospheric Circulation Anomaly of Floods /Drought Summer in Shaanxi Province
Abstract: Based on NCEP /NCAR reanalysis data and monthly precipitation data in Shaanxi Province from 1961 to 2008,the spatial and temporal distribution characteristics of summer precipitation and the abnormal signal of early climate system characteristics were analyzed by using EOF and composite analysis methods. Results show that when the Ural Mountain and the Okhotsk Sea high were stronger,the Baikal trough was deeper,and the west Pacific subtropical high strengthened and extended westward in summer,there would be flooding in summer of Shaanxi. Whereas,when Shaanxi was controlled by the northwest flow in front of the Central-Asian ridge, the west Pacific subtropical high was weaker and extended eastward,it would be drought in summer of Shaanxi. When the Central-Asian ridge was stronger and extended westward,the west Pacific subtropical high strengthened,the India-Burma trough was weaker, and there were abnormal strong north wind in the eastern region of Northwest to the North China at the level of 700 hPa,SST in the middle east equatorial Pacific was higher and in west wind drift area was lower,SST in India ocean was higher in the preceding winter, there would be flooding in summer of Shaanxi. Whereas when the Northwestern Europe trough was stronger,the CentralAsian ridge was weaker,the west Pacific subtropical high was weaker,the India-Burma trough was stronger,there were abnormal strong south wind in the eastern region of Northwest to North China at the level of 700 hPa,SST in the middle east equatorial Pacific was lower and higher in west wind drift area,and SST in India ocean was lower in the preceding winter,there would be drought in summer of Shaanxi.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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