Different Relationships Between Spring SST in the Indian and Pacific Oceans and Summer Precipitation in China

• Published in: Acta meteorologica Sinica Vol. 27; no. 4; pp. 509 - 520
• Main Author: 李熠 武炳义 杨秋明 黄世成
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2013; Jiangsu Institute of Meteorological Sciences,Nanjing,210008%Chinese Academy of Meteorological Sciences,Beijing,100081
• Subjects: Atmospheric Protection/Air Quality Control/Air Pollution; Atmospheric Sciences; Earth and Environmental Science; Earth Sciences; Geophysics and Environmental Physics; Indexing in process; Meteorology; SST异常; 中国夏季降水; 印度洋海温; 太平洋海温; 春节期间; 海温异常; 西北太平洋; 长江流域; summer precipitation; Pacific Ocean; Indian Ocean; SST
• ISSN: 0894-0525; 2191-4788
• DOI: 10.1007/s13351-013-0501-4

Observational and reanalysis data are used to investigate the different relationships between boreal spring sea surface temperature （SST） in the Indian and Pacific oceans and summer precipitation in China. Partial correlation analysis reveals that the effects of spring Indian Ocean SST （IO SST） and Pacific SST （PSST） anomalies on summer precipitation in China are qualitatively opposite. When IO SST anomalies are considered independently of PSST anomalies, precipitation decreases south of the Yangtze River, in most areas of Inner Mongolia, and in some parts of Liaoning Province, and increases in the Yangtze River valley, parts of southwestern and northern China, northeastern Inner Mongolia, and Heilongjiang Province. This results in a negative-positive-negative-positive pattern of precipitation anomalies in China from south to north. When PSST anomalies （particularly those in the Nin o3.4 region） are considered independently of IO SST anomalies, the pattern of precipitation anomalies in China is positive-negative-positive-negative from south to north. The genesis of summer precipitation anomalies in China is also examined when El Nin o-Southern Oscillation （ENSO） signals are removed from the ocean and atmosphere. An anticyclonic low-level wind anomaly forms in the South China Sea-Northwest Pacific area when the IO SST anomaly （SSTA） is warm and the Northwest Pacific SSTA is cold. This anticyclonic anomaly substantially influences summer precipitation in China. Anomalous warming of tropical IO SST induces positive geopotential height anomalies in the subtropics and an east-west dipole pattern in midlatitudes over Asia. These anomalies also affect summer precipitation in China.