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第 98 回 大気海洋物理系 B 棟コロキウム のおしらせ

日　時：2000年 12月 4日(月) 午後 16:30 〜 18:30
場　所：地球環境科学研究科 管理棟 ２階講堂

発表者：Erwin Mulyana (気候モデリング講座 M2)
題　目：Indonesia Rainfall Variations in Association with ENSO

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Indonesia Rainfall Variations in Association with ENSO (Erwin Mulyana) 発表要旨 :

  
 Indonesia is a maritime continent, wich is surrounded by two 
 continents, Asia and Australia, and two oceans, Indian and Pacific 
 Ocean. Climate condition over Indonesia are affected by global 
 phenomena such as Asian and Australian monsoon, El Nino and local 
 variables which are related to local topographies. The annual cycle is  
 dominant in Java rainfall, with maximum in boreal winter and minimum 
 in boreral summer. 
  
 A normalized rainfall index for period 1961-1993 was constructed from 
 21 stations in Java. The highest correlation between Java Rainfall 
 Index (JRI) and Southern Oscillation Index (SOI) is found in 
 September-November season. During this season positive anomaly in Java 
 rainfall is associated with negative anomaly of sea surface 
 temperature in Central Equatorial Pacific. In El Nino event, when the 
 warming of sea surface temperature occures in Central Equatorial 
 Pacific, rainfall in Java is decreased. 
  
 Throuhgout the year, westerly anomaly at 850 hPa over equatorial Indian  
 Ocean and Indonesia region is associated with positive anomaly in Java  
 rainfall. During December-February, in addition to the westerly 
 anomaly as mention above, anomalous northerly over South China Sea is 
 associated with positive anomaly in Java rainfall.  
  

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