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第 28 回 大気海洋物理系 B 棟コロキウムのお知らせ

日　時：1998年 1月 29日(金) 午後 4:30 〜 6:30
場　所：地球環境科学研究科 管理棟 2F 講堂

発表者：T. G. Prasad (気候モデリング講座 研究生)
題　目：Annual and Seasonal mean buoyancy fluxes for the tropical Indian Ocean

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Annual and Seasonal mean buoyancy fluxes for the tropical Indian Ocean (T. G. Prasad) 発表要旨 :

 INSAT-derived montly mean precipitation, combined with estimates of 
 evaporation from COADS, are used to prepare the annual mean and seasonal 
 distributions of evaporation-precipitation (E-P) and buoyancy fluxes for 
 the tropical Indian Ocean. The fluxes of heat and freshwater across the 
 air-sea interface, and hence the surface buoyancy flux, show strong spatial 
 and temporal variability. The Bay of Bengal and eastern equatorial Indian 
 Ocean are characterized by a net freshwater gain due to heavy 
 precipitation, while the northern Arabian Sea and the ocean south of 10^oS 
 experience a net loss of freshwater due to excessive evaporation. The 
 regions of high and low salt flux broadly correspond to those of high and 
 low E-P and the seasonal fluctuations of E-P appear to contribute to the 
 seasonal cycle of salt flux. The buoyancy flux is dominated by strong 
 density loss by the ocean in the northern Indian Ocean and modest density 
 gain in the southern Indian Ocean. Though heat flux is the dominant 
 contributor to the buoyancy flux over most of the region, salt flux 
 dominates during winter in the northern Arabian Sea and during summer and 
 fall in the Bay of Bengal and the eastern equatorial Indian Ocean. 
  
 Keywords/Free Terms: Buoyancy flux, Indian Ocean, E-P 

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