Urbanization effects on summer precipitation over the Pearl River Delta
Urbanization effects on summer precipitation over the Pearl River Delta
复制标题
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Xu Haiming
中科院分区：
文献类型：
--
作者：
Xu Haiming
利用TRMM2A25和CMORPH资料，分析了珠江三角洲地区城市化对降水的影响，发现珠江三角洲地区是一个降水偏少的降水中心，尤其是对流性降水，近10年来，中心城市降水量呈下降趋势，城市化进程可能导致近10年来降水量的减少利用WRF模式进行的数值试验表明，城市化对珠江三角洲地区的降水有显著影响，城市扩展减少了自然植被覆盖，从而有助于减少地面蒸发和局地水汽供应，增加地面感热通量，加深边界层高度，加强水汽混合，不利于降水的发生
The urbanization effects on precipitation over the Pearl River Delta area based on TRMM2A25 and CMORPH data are studied.It is found that the Pearl River Delta area is a rainfall centre where there is less precipitation than its surrounding area,especially for convective rainfall,and over the centre cities the rainfall tends to decline in the last ten years.It is suggested that the urbanization may result in the decrease in precipitation over the Pearl River Delta area.Furthermore,numerical experiments with WRF prove that the urbanization has a significant impact on the rainfall.One important interaction mechanism is also revealed,that is,the urban expansion reduces natural vegetation cover,and then it can help to decrease ground evaporation and local water vapor supply,enlarge surface sensible heat flux,deepen PBL height and enhance the mixing of water vapor.Hence it is not conducive to the occurrence of the rainfall