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

更新时间:2023-08-14

【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 tropical 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.

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