海洋预报2016，Vol.33Issue(5)：9-22,14.DOI:10.11737/j.issn.1003-0239.2016.05.002
孟加拉湾热源与中国夏季雨带分布的关系--Rossby波的作用
The relationship between bay of Bengal heating and summer monsoon precipitation over China-the effect of Rossby wave
摘要
Abstract
Based on the theory of planetary wave propagation in the horizontal non-uniform basic flow, the propagation of Rossby wave inspired by the heating over Bay of Bengal (BOB) and its related summer precipi-tation in China has been investigated. The results show that Rossby waves of 10—20 d period commence from BOB region, pass through Indochina Peninsula, Southwest China, and arrive in the Yangtze River Basin, and then reach further to North China. The ray path is consistent with the northward propagation of the summer monsoon rainfall over China. The wave energy could disperse to the concerned rainfall regions within 7—10 days. Rossby waves of 30—60 d period propagate in two separate branches. One is consistent with the path of 10—20 d Rossby wave, and the other one propagates eastward to the South China Sea and the Philippines, and turns northward to China's eastern coastal areas and Japan, then reaches North America eventually. The latter path is in line with the stationary Rossby wave rays, known as the EAP/PJ wave train, and has a direct impact on China eastern coastal areas and Japan. Two periods of Rossby wave could explain the low frequency oscillation features of the summer monsoon rainfall over China. Moreover, the wave energy variation during propagation has been studied. Along the propagation pathway, the wave energy decreases at lower level (850 hPa), implying the energy is transferred to the base flow, while oscillates at the upper level (200 hPa), indicating the wave-current interaction there.关键词
Rossby波/波射线/降水/低频振荡Key words
Rossby wave/wave rays/precipitation/low frequency oscillation分类
天文与地球科学引用本文复制引用
亢妍妍..孟加拉湾热源与中国夏季雨带分布的关系--Rossby波的作用[J].海洋预报,2016,33(5):9-22,14.基金项目
国家自然科学面上基金（41376016）；国家自然科学重点基金 （）
