城市下垫面对华南地区前汛期暴雨的影响初探

Affection of city underlying surface on heavy rain in the former flood season of south China

通过对2010年5月9日发生在广东地区的一次前汛期暴雨过程进行了模拟试验,探讨了城市下垫面通量对降水的影响。控制试验基本能反映此次暴雨过程的环流形势,降水特征。试验结果表明:城市下垫面感热、潜热和水汽通量对降水强度和分布都有影响,不考虑城市下垫面通量的作用,降水都有所减小,对流强度减弱。但城市下垫面水汽通量对上层水汽的作用影响不大。

Based on the simulation test of the rainstorm process in the first flood season of Guangdong province on May 9th, 2010, the effect of the underlying surface flux of the city on the precipitation was discussed. The control test can basically reflect the circulation situation and precipitation characteristics of the rainstorm. The test results show that： the city underlying surface sensible heat, latent heat and water vapor flux all have effects on the precipitation intensity and distribution, without the effect of city underlying surface flux, precipitation become less and convection strength are weaker. But the water vapor flux in the city has little effect on the water vapor in the upper layers.