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El Ni?o事件可根据其建立时间分为春季型(SPEN)和夏季型(SUEN)。本文使用NCEP的位势高度、纬向风数据和Hadley中心的海温数据,分析了SPEN和SUEN对南亚高压(SAH)季节变化的影响。结果表明SAH对SPEN和SUEN的响应有显著差异。与SUEN相比,SPEN的影响下的SAH在6月份北移的速度较慢,而在10月份SPEN影响下的SAH向东南运动的速度更快。即SPEN的影响下的SAH生命周期较SUEN影响下的SAH更短。另外,与SUEN相比,SPEN影响下的SAH在7月和9月更倾向于青藏高原模态。
El Niño events can be divided into spring type (SPEN) and summer type (SUEN) according to their establishment time. In this paper, we use the NCEP geopotential height and zonal wind data and the Hadley center sea temperature data to analyze the effects of SPEN and SUEN on the seasonal variations of SAH. The results showed that the response of SAH to SPEN and SUEN was significantly different. Compared with SUEN, SAH under the influence of SPEN moved north more slowly in June, while SAH moved to the southeast faster under the influence of SPEN in October. That is, the life span of SAH under the influence of SPEN is shorter than the SAH under the influence of SUEN. In addition, compared with SUEN, SAH under the influence of SPEN in Qinghai-Tibet Plateau in July and September are more inclined to the mode.