基于WRF模式的南海海温梯度对强对流作用的数值试验  

Numerical simulation of the effects of sea surface temperature gradients on severe convective weather over the South China Sea based on WRF model

作　　者：杨薇[1] 李勋[1] 石娟[1] YANG Wei;LI Xun;SHI Juan(Hainan Meteorological Services/Hainan Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation,Haikou,Hainam 570203,China)

机构地区：[1]海南省气象台/海南省南海气象防灾减灾重点实验室,海口570203

出　　处：《热带生物学报》2023年第5期560-568,共9页Journal of Tropical Biology

基　　金：国家自然科学基金联合基金项目(U21A6001);海南省自然科学基金青年基金项目(423QN318);海南省重点研发项目(ZDYF2023SHFZ125)。

摘　　要：为了研究海洋中海温梯度与强对流的关系,利用WRF模式模拟了2010年8月14日发生在南海东北部的一次强对流天气过程,通过一组控制试验与敏感性试验,对比分析了强对流天气发生发展过程中水汽输送、风场变化和地表热通量的变化。结果表明,海洋中的高海温梯度区可通过改变局地热力条件而影响中低层风场,引起辐合辐散,并增强该区水汽输送,使得大量潜热释放,为强对流的发展提供能量。降水区域与高海温中心以及强海温梯度区对应,高(低)海温梯度区可引起感热通量和潜热通量发生变化从而加强(抑制)降水。To investigate the impact of sea surface temperature gradients on severe convection,Weather Research and Forecasting(WRF)model is used to simulate a severe convection event occurred in the northeast of the South China Sea on 14 August 2010.The characteristics of water vapor transport,wind field and ground surface heat flux were analyzed during the development of severe convection by comparing a control run(CNTL)with a sensitivity experiment(EXP).Results show that ocean warm eddy and high SST gradient can stimulate convergence or divergence and enhance moisture transport by changing local thermal conditions,which cause release of latent heat providing energies for the evolution of severe convection.The precipitation regions correspond to the high SST center and the strong SST gradient area.The high(low)SST gradients can cause changes in sensible heat flux and latent heat flux,thus strengthening(inhibiting)precipitation.

关 键 词：海温梯度 数值模拟 WRF 强对流 

分 类 号：P461.2[天文地球—大气科学及气象学] P435