JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (7): 1187-1195.doi: 10.11849/zrzyxb.2013.07.011

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Diagnostic Analysis of the Relationships between the Summer Precipitation in the Sichuan-Chongqing Region and SST in the Equatorial Indian Ocean

ZHOU Qiang1,2, LI Guo-ping1, MAO Wen-shu1   

  1. 1. College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;
    2. Shandong Provincial Meteorological Service Center, Jinan 250031, China
  • Received:2011-04-11 Revised:2012-12-16 Online:2013-07-20 Published:2013-07-20

Abstract:

Based on the precipitation data from 34 stations in Sichuan-Chongqing area and the monthly sea surface temperature (SST) reanalysis data of the NOAA/ESRL from 1960 to 2006, the relationship between the summer precipitation in the Sichuan-Chongqing region and SST of the Indian Ocean are studied by the methods of the empirical orthogonal function, point correlation, synthesis analysis and singular value decomposition analysis. The results of EOF for the summer standardized anomaly precipitation field shows that the first three modalities are steady and the first mode accounted for 27.8% of the total variance. The spatial distribution of precipitation presents the same type of the whole area. The analysis of point correlation shows that summer precipitation in the Sichuan-Chongqing region and the equatorial Indian Ocean region (10°N-16°S, 57-77°E) (hereinafter referred to as a key area) were significantly correlated. Synthetic analysis shows that when the SST of equatorial Indian Ocean anomalies was warmer (colder) than the normal, summer precipitation of the Sichuan-Chongqing region increased (decreased). SVD decomposition results show that summer precipitation in the Sichuan-Chongqing region and SST of the Indian Ocean was significantly correlated to the specific performance that SST of the Indian Ocean was in the same phase change with summer precipitation in eastern basin and western plateau of Sichuan Province, and the central basin was anti-phase change.

Key words: summer precipitation, SST of Indian Ocean, EOF, SVD, Sichuan-Chongqing region

CLC Number: 

  • P467