副热带高压和对流潜热加热与南海台风的耗散及维持

SUBTROPICAL HIGH AND CUMULUS CONVECTION LATENT HEATING IN RELATION TO DISSIPATION AND MAITENANCE OF TYPHOONS IN SOUTH CHINA SEA

利用自适应网格模式对９５０５号及９６１８号南海台风进行了数值模拟及试验，试验结果表明：南海台风的耗散主要与副热带高压加强有关，地形的影响较小。副高的活动对台风的加强与减弱十分敏感，当副高减弱时台风加强，副高加强时台风减弱。潜热释放是台风维持的主要因子。副高强度与潜热加热的大小成反比。分析发现，台风登陆后若与西风槽接近，则有利于台风维持。

In this paper, using the continuous dymantic grid adapation technique,Typhoon Helen(1995) and Willie (1996) in South China Sea are modeled. It is found that the dissipations of typhoons are related to the increase of the intensity of subtropical high.The orographic effect isn′t important.The actions of the high is very sensitive to intensities of the typhoons.When the high′s intensity decreases, the typhoon increases and when the high′s increases, the typhoon decreases. The cumulus convection latent heating is an important factor for maintance of typhoons.The intensity of high is inverse proportion to the heating. If a landing typhoon comes close to the westerlies trough,it is helpful for the maintance of typhoon.