【作者】 郑彬； 林爱兰； 李春晖； 谷德军；

【Author】 Zheng Bin Lin Ailan Li Chunhui Gu Dejun (Guangzhou Institute of Tropical Marine and Meteorology / Key Open Laboratory for Tropical Monsoon, China Meteorological Administration, Guangzhou 510080)

【机构】 中国气象局广州热带海洋气象研究所/热带季风重点开放实验室；

【摘要】 利用2007年全球降水气候计划GPCP(the Global Precipitation Climatology Project)卫星红外窗口导出的全球降水指数GPI(the Global Precipitation Index)的日降水资料及频率-波数分析方法,分析2007年南海夏季风季节内振荡(Intraseasonal Oscillation,ISO)的传播特征,并使用美国国家环境预报中心NCEP(the National Centers for Environmental Prediction)/美国大气研究中心NCAR(National Center for Atmospheric Research)再分析的逐日资料探讨影响其传播的主要因子。结果表明,南海夏季风ISO有明显的北传趋势,并且明显比南传分量占优。影响南海夏季风ISO北传的主要因子是平均纬向风垂直切变和平均经向风对异常水汽的输送。之所以异常经向风对平均水汽的输送及海-气相互作用的影响在南海地区不重要,而在印度季风区有一定的贡献,是因为平均水汽和纬向风分布在两个地区的差异。更多还原

【Abstract】 The Global Precipitation Climatology Project (GPCP) Satellite-Derived (IR) GPI Daily Rainfall and frequency-wavenumber method are used to analyze the propagating features of the intraseasonal oscillation (ISO) associated with South China Sea summer monsoon (SCSSM) in 2007. Then, the NCEP (National Centers for Environmental Prediction)/ NCAR (National Centerfor Atmospheric Research) daily reanalysis are employed to explore what drive the ISO propagate northwards. The results indicate that the ISO of SCSSM tends to move northwards greatly and the northward propagation has much more portions than the southward one. Climatological mean zonal wind vertical shear and anomalous water vapor transported by mean meridional flow. However, because of differences of mean zonal flow and water vapor between SCSSM and Indian summer monsoon region, mean water vapor transported by anomalous meridional wind and air-sea interaction play a negligible role in northward propagation of ISO over the SCSSM region, though both of them contribute to that in Indian summer monsoon region to some extent.更多还原