Based on the precipitation data at 30 stations over Sichuan-Chongqing region from June to August and NCEP/NCAR reanalysis data of 2.5°×2.5° including the monthly mean geopotential heights and wind fields during recent 50 years, the relationships between the East Asian subtropical westerly jet (EAWJ) in summer and precipitation over Sichuan-Chongqing regiond have been investigated, using the methods of canonical correlation analysis, correlation analysis, and regression analysis. The results are as follows: The latitudinal position of the EAWJ has a significant influence on precipitation of Sichuan-Chongqing region. In detail, the northward EAWJ axis could result in more precipitation in the western Sichuan basin, as well as less precipitation in both the eastern Sichuan basin and the western Sichuan plateau, and vice versa. The correlations between the EAWJ axis and precipitation over Sichuan-Chongqing region take better performance in summer, but weaker in June, July and August. Corresponding to the abnormally northward (southward) EAWJ axis, the South Asian high inclines to more westward (eastward) position, while the western Pacific subtropical high tends to more eastward (westward) position. Meanwhile, the ridge line of the western Pacific subtropical high tends to more northward (southward) position, as well as smaller (larger) area of the South Asian high and the western Pacific subtropical high. Those anomalous configuration patterns of the lower and higher circulation result in variability of precipitation over Sichuan-Chongqing region. The inter-decadal change of latitudinal position of the EAWJ is one of the main factors that cause the reverse distributions of precipitation for the periods 1965-1982 with respect to 1983-2006 over Sichuan-Chongqing region. Especially, both the eastern Sichuan basin and the western Sichuan plateau changed from less to more, and the western basin obviously decreased.
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