亚洲季风区感热凝结潜热对副高带季节演变的影响

EFFECTS OF SENSIBLE HEATING FLUX AND LATENT HEATING ON SEASONAL EVOLUTION OF THE SUBTROPICAL HIGH BELT OVER ASIA MONSOON REGION

利用1958～1998年NCEP/NCAR的逐日再分析资料,探讨了亚洲夏季风建立期间感热、凝结潜热和副高带季节演变的气候特征,并重点分析它们相互耦合的特征。结果表明:亚洲季风区的地表感热、凝结潜热影响印缅槽生成和阿拉伯副高西移的机制是相似的,5月初,印度半岛较强的感热通量和中南半岛较强的凝结潜热共同影响副高带的断裂及印缅槽的生成,5月底～6月上旬阿拉伯半岛较大的感热通量和印度半岛西侧较强的凝结潜热有利于阿拉伯副高的西移。

Multi-year NCEP/NCAR reanalysis data were used to analyze the effects of the sensible heating flux and the latent heating on the seasonal evolution of the subtropical high belt during the onset-period of the Asia summer monsoon. The results show that the effects of the sensible heating flux and the latent heating on the establishment of India-Burma trough and the westward retreat of Arabia subtropical high are quite similar. The intensive sensible heating flux of the Indian peninsula and latent heating over the Indo-China peninsula is favorable to the establishment of India-Burma trough at the beginning of May, and the intensive sensible heating of Arabia and latent heating over the Indian peninsula is favorable to the westward retreat of Arabia subtropical high from the end of May to early June.