1999年广东汛期降水的季节内振荡  

AN OBSERVATIONAL STUDY OF INTERASEASONAL VARIATIONS OVER GUANGDONG PROVINCE CHINA DURING THE RAINY SEASON OF 1999

作　　者：唐天毅[1] 吴池胜[2] 王安宇[2] 侯尔滨[1] 罗会邦[2] 

机构地区：[1]澳门地球物理暨气象局 [2]中山大学大气科学系,广东广州510275

出　　处：《热带气象学报》2007年第6期683-689,共7页Journal of Tropical Meteorology

摘　　要：根据广东6个代表站和澳门大潭山的降水资料以及NCEP的再分析资料，利用波谱分析法和Marakami的带通滤波技术，分析了1999年4-9月广东降水的季节内振荡（ISO）特征及其与大气环流的ISO之间的联系。结果表明：广东汛期降水的季节内变化的主模是10～20天振荡；850hPa层上影响广东地区的周期为10—20天的低频环流系统有两类传播模型，一类是由中纬度传到广东地区；另一类是来自热带地区，广东降水的10～20天振荡与它们的活动密切相关。In the present study, intraseasonal variations of precipitation in Guangdong Province of China during the rainy season of 1999 and the accompanying variations of the tropospheric circulation are analyzed with the use of rain data collected by the National Climate Center of China and the NCEP-NCAR reanalysis data. The harmonics analysis reveals that the main component of the intraseasonal variations of the 1999 precipitation is the 10-20-day oscillation. With the 10-20-day filtered 850-hPa wind data over the area of the South China Sea monsoon, it is found that the transient ridges and troughs associated with the 10-20-day oscillation over the Guangdong Province may come from the mid-latitudes or from the tropics and it is considerably responsible for the 10-20-day variations of the 1999 precipitation.

关 键 词：季节内变化 降水 广东 

分 类 号：P426.6[天文地球—大气科学及气象学]