Seasonal Heating Processes over the Indochina Peninsula and the Bay of Bengal Prior to the Monsoon Onset in 1998

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概要

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• Using GAME reanalysis upper-air data, we attempt to reveal the seasonal evolution of the heat source (Q_1), and moisture sink (Q_2) over and around the Indochina Peninsula (IP), from April to June 1998. Pre-monsoon rainfall occurs inland of IP prior to the large-scale monsoon onset in middle May. In this period, positive Q_1, in excess of 3K day^<-1>, appears around the middle-lower Mekong River basin (MLMRB) centered around 500-600hPa, which is accompanied by positive Q_2, slightly below the peak level of Q_1. This suggests that the pre-monsoon rainfall is associated with a cumulus-type convection. The horizontal distribution of vertically integrated Q_1 (<Q_1>) and Q_2 (<Q_2>) over MLMRB is similar, suggesting that the contribution of latent heating is nearly equivalent to sensible heat supply from the land surface. In contrast, negative <Q_1>, less than -100Wm^<-2>, is discernible over the Bay of Bengal (BoB), which is collocated with a strong downward motion. Once the large-scale monsoon commences, the value of <Q_1> in MLMRB becomes roughly the same magnitude as those in the pre-monsoon season. The vertical profile of Q_1 and Q_2 are indicative of the existence of stratiform and cumulus-type clouds. On the other hand, the whole troposphere over BoB is abruptly occupied by deep heating, associated with convective activities as implied by positive <Q_1> and <Q_2>. These atmospheric heat and moisture budget analysis indicate the presence of a large regional difference between MLMRB and BoB, especially in the pre-monsoon season. The qualitative heating difference, which may be attributable to the structure of the cumulus-type convection, is recognizable even after the monsoon onset.

• 社団法人日本気象学会の論文
• 2006-04-25

著者

• Ishizaki Noriko

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Ueda Hiroaki

  Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba

• Ueda Hiroaki

  Graduate School Of Agricultural Science Kobe University

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