The Relationship of Land-Ocean Thermal Anomaly Difference  with Mei-yu and South China Sea Summer Monsoon

WANG Zhifu; QIAN Yongfu

doi:10.1007/s00376-009-0169-y

Impact Factor: 5.8

Volume 26 Issue 1

Jan. 2009

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2009 > 26(1): 169-179

The Relationship of Land-Ocean Thermal Anomaly Difference with Mei-yu and South China Sea Summer Monsoon

1.
Department of Atmospheric Sciences, Nanjing University, Nanjing 210093; Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science $\&$ Technology, Nanjing 210044;Department of Atmospheric Sciences, Nanjing University, Nanjing 210093

doi: 10.1007/s00376-009-0169-y

Abstract
References
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Abstract:
Based on the NCEP/NCAR reanalysis data for the period of 1948--2004 and the monthly rainfall data at 160 stations in China from 1951 to 2004, the relationships among the land-ocean temperature anomaly difference in the mid-lower troposphere in spring (April--May), the mei-yu rainfall in the Yangtze River-Huaihe River basin, and the activities of the South China Sea summer monsoon (SCSSM) are analyzed by using correlation and composite analyses. Results show that a significant positive correlation exists between mei-yu rainfall and air temperature in the middle latitudes above the western Pacific, while a significant negative correlation is located to the southwest of the Baikal Lake. When the land-ocean thermal anomaly difference is stronger in spring, the western Pacific subtropical high (WPSH) will be weaker and retreat eastward in summer (June--July), and the SCSSM will be stronger and advance further north, resulting in deficient moisture along the mei-yu front and below-normal precipitation in the mid and lower reaches of the Yangtze River, and vice versa for the weaker difference case. The effects and relative importance of the land and ocean anomalous heating on monsoon variability is also compared. It is found that the land and ocean thermal anomalies are both closely related to the summer circulation and mei-yu rainfall and SCSSM intensity, whereas the land heating anomaly is more important than ocean heating in changing the land-ocean thermal contrast and hence the summer monsoon intensity.
- land-ocean thermal anomaly difference,
- South China Sea summer monsoon,
- Yangtze River-Huaihe River mei-yu rainfall,
- correlation analysis,
- composite analysis
References

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Manuscript History

Manuscript received: 10 January 2009

Manuscript revised: 10 January 2009

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

The Relationship of Land-Ocean Thermal Anomaly Difference with Mei-yu and South China Sea Summer Monsoon

1. Department of Atmospheric Sciences, Nanjing University, Nanjing 210093; Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science $\&$ Technology, Nanjing 210044;Department of Atmospheric Sciences, Nanjing University, Nanjing 210093

Manuscript received: 2009-01-10
Manuscript revised: 2009-01-10

Abstract: Based on the NCEP/NCAR reanalysis data for the period of 1948--2004 and the monthly rainfall data at 160 stations in China from 1951 to 2004, the relationships among the land-ocean temperature anomaly difference in the mid-lower troposphere in spring (April--May), the mei-yu rainfall in the Yangtze River-Huaihe River basin, and the activities of the South China Sea summer monsoon (SCSSM) are analyzed by using correlation and composite analyses. Results show that a significant positive correlation exists between mei-yu rainfall and air temperature in the middle latitudes above the western Pacific, while a significant negative correlation is located to the southwest of the Baikal Lake. When the land-ocean thermal anomaly difference is stronger in spring, the western Pacific subtropical high (WPSH) will be weaker and retreat eastward in summer (June--July), and the SCSSM will be stronger and advance further north, resulting in deficient moisture along the mei-yu front and below-normal precipitation in the mid and lower reaches of the Yangtze River, and vice versa for the weaker difference case. The effects and relative importance of the land and ocean anomalous heating on monsoon variability is also compared. It is found that the land and ocean thermal anomalies are both closely related to the summer circulation and mei-yu rainfall and SCSSM intensity, whereas the land heating anomaly is more important than ocean heating in changing the land-ocean thermal contrast and hence the summer monsoon intensity.

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