An Observational Study of Intraseasonal Variations over Southeast Asia during the 1998 Rainy Season
An Observational Study of Intraseasonal Variations over Southeast Asia during the 1998 Rainy Season
复制标题
DOI：
10.1175/mwr2967.1
复制
发表时间：
2005-07
影响因子：
3.2
通讯作者：
S. Yokoi;T. Satomura
中科院分区：
文献类型：
--
作者：
S. Yokoi;T. Satomura
摘要本文主要利用雨量计资料和全球能量和水循环试验（GEWEX）亚洲季风试验（GAME）再分析1.5版，分析了1998年泰国降水的季节内变化及其伴随的对流层环流变化。小波分析表明，1998年TDR的季节内变化的振幅呈现出两个峰值。一个峰值被归类为30-60天的变化，出现在雨季的前半部分，而另一个峰值被归类为10-20天的变化，出现在雨季的后半部分。分析了与TDR后峰有关的大气环流变化。当TDR的10-20天变化处于最活跃位相时，孟加拉湾上空850 hPa流函数为负异常，而孟加拉湾以南的南半球为正异常。
Abstract In the present study, intraseasonal variations of precipitation over Thailand [Thailand daily rainfall (TDR)] during 1998 and the accompanying variations of the tropospheric circulation are analyzed, mainly with the use of rain gauge data and the Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment (GAME) reanalysis version 1.5. Wavelet analysis reveals that the amplitudes of the intraseasonal variations of the 1998 TDR exhibit two peaks. One peak is categorized as a 30–60-day variation that appeared in the early half of the rainy season, while the other peak is categorized as a 10–20-day variation that appears in the later half of the rainy season. The variation of atmospheric circulation associated with the latter peak of the TDR is analyzed. When the 10–20-day variation of the TDR is in the most active phase, a negative streamfunction anomaly at the 850-hPa level exists over the Bay of Bengal, and a positive anomaly is found in the Southern Hemisphere to the south of the n...