海洋热通量对东海气旋发展影响的数值试验

Ocean impact on the development of cyclone over the East China Sea

利用PSU/NCARMM 4对东海两个弱气旋个例的初期入海发展进行了数值模拟和敏感性试验的研究 ,并对主要结果进行了分析 .采用总体空气动力学边界层及显式水汽方案的控制试验较成功地模拟出了气旋涡度场的型式和中心强度 .在此基础上针对海洋热通量进行了敏感性试验 .结果表明 ,海洋热通量输送对东海气旋的发展有非常重要的作用 .不计初期海洋热通量输送可减少模拟气旋强度的 4 5%以上 ;初始 (入海前 )增加海 -气温差 1K可使气旋强度增加 2 % ;初始增加海洋潜热输送 (海 -气饱和水汽差 ) 1 %使气旋强度增加 50 %左右 .潜热输送的贡献约为感热的2 0倍 .海洋热输送加大了低层大气的不稳定性 。

A series of numerical simulations and sensitivity tests are performed at first with PSU/NCAR MM4 for two case cylones which experienced their early stage moving offshore into the East China Sea, the result is then analyzed. Both the pattern and central intensity of the vorticity field have been simulated successfully using the bulk aerodynamic boundary layer and apparent vapor scheme in the model. The sensitivity tests have been done for the marine heat flux (including latent and sensible heat fluxes). It i...