The 30–60-day Intraseasonal Oscillations over the Subtropical Western North Pacific during the Summer of 1998  

作　　者：LU Riyu DONG Huilin SU Qin Hui DING 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences [2]University of the Chinese Academy of Sciences [3]Helmholtz Centre for Ocean Research Kiel and Kiel University

出　　处：《Advances in Atmospheric Sciences》2014年第1期1-7,共7页大气科学进展（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No2010CB950403);by the National Natural Science Foundation of China(Grant No.U0933603)

摘　　要：The features of 30-60-day convection oscillations over the subtropical western North Pacific （WNP） were investigated, along with the degree of tropical-subtropical linkage between the oscillations over the WNP during summer 1998. It was found that 30-60-day oscillations were extremely strong in that summer over both the subtropical and tro]~ical WNP, providing a unique opportunity to study the behavior of subtropical oscillations and their relationship to tropical oscillations. Further analyses indicated that 30-60-day oscillations propagate westwards over the subtropical WNP and reach eastern China. In addition, 30-60-day oscillations in the subtropics are affected by those over the South China Sea （SCS） and tropical WNP through two mechanisms： （1） direct propagation from the tropics into the subtropics; and （2） a seesaw pattern between the tropics and subtropics, with the latter being predominant.The features of 30-60-day convection oscillations over the subtropical western North Pacific （WNP） were investigated, along with the degree of tropical-subtropical linkage between the oscillations over the WNP during summer 1998. It was found that 30-60-day oscillations were extremely strong in that summer over both the subtropical and tro]~ical WNP, providing a unique opportunity to study the behavior of subtropical oscillations and their relationship to tropical oscillations. Further analyses indicated that 30-60-day oscillations propagate westwards over the subtropical WNP and reach eastern China. In addition, 30-60-day oscillations in the subtropics are affected by those over the South China Sea （SCS） and tropical WNP through two mechanisms： （1） direct propagation from the tropics into the subtropics; and （2） a seesaw pattern between the tropics and subtropics, with the latter being predominant.

关 键 词：intraseasonal oscillation CONVECTION western North Pacific tropical-extratropical interaction 

分 类 号：P432[天文地球—大气科学及气象学]