亚洲季风与ENSO对新加坡降雨影响的初步研究
THE EFFECTS OF ASIAN MONSOON AND ENSO ON SINGAPORE RAINFALL-A PRELIMINARY STUDY
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摘要: 根据1800-1989年(110年)的资料,分析研究了新加坡地区月平均和年平均降雨量的一些特征。主要结论是:新加坡年平均降雨量存在准2-6年和18年的周期振荡;亚洲季风以及ENSO对新加坡降雨量有明显的影响。新加坡年雨量的谷值出现在西南季风期而峰值在东北季风期。在El Nino年,新加坡降雨量多为负距平;而在反El Nino年,新加坡降雨量多为正距平。Abstract: Geographically, Singapore lies between islands of Kalimantan and Sumatra. This happens to be the common passageway for the Southwest monsoon wind in summer(northern) and the Northeast monsoon wind in winter(northern). Thus, to a large degree, rainfall in Singapore is controlled by these wind systems. In addition, as our preliminary study indicates, rainfall in Singapore is also significantly affected by the El Nino events.In this study, monthly mean rainfall data in Singapore from year 1880 through year 1989(110 years) together with published information on El Nino events were used. The time series and statistical analyses on these data have revealed some interesting rainfall characteristics pertaining to Southwest monsoon(June to September) and Northeast monsoon(December to March) seasons. The relationship between rainfall and El Nino events are also discussed in this paper. Statistical significance testing have been used to ensure validity of the discussion on rainfall variation.
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Key words:
- Southwest monsoon /
- Northeast monsoon /
- ENSO /
- Rainfall in Singapore
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