运用完全在线耦合气溶胶—云—降水相互作用的WRF-Chem模式研究了污染气溶胶在2012年“7.21”极端降水事件中的作用,结果表明:在耦合人为排放源的情况下,通过与多种观测资料对比发现,WRF-Chem能较好地模拟此次极端降水事件中气象要素和气溶胶的发展趋势;不同水平的污染气溶胶在此次极端降水事件有不同的作用,相对于无污染气溶胶排放的情况,低排放水平的污染气溶胶对降水有激发作用,使降水增强,高排放水平污染气溶胶使降水更加的集中到降水中心,200 mm以上的降水区域增加了7倍以上,污染气溶胶对此次极端暴雨事件的形成有着重要作用;加入人为气溶胶的排放后,凝结核的增多、更加充沛的水汽条件及额外的凝结潜热的释放,使对流增强,降水粒子的含量增加是导致大暴雨更加强烈的原因.%The aerosol-cloud-precipitation interaction was fully coupled online by using WRF-Chem model to investigate the impact of Anthropogenic Pollution(AP) on an extreme heavy rainstorm.It is suggested that WRF-Chem model could reasonably simulate the meteorology and chemistry condition of the extreme rainstorm with a fully AP through the comparison with available observation data.A decreased AP could invigorate the precipitationin contrast with that without AP,however,in the case with a fully AP,the area where precipitation.amount above 200 mm was 7 times of the case without (with a decreased) AP,and AP has a substantial influence on the extreme rainstorm.The increase of cloud condensation nuclei,sufficient moisture and extra releasing of latent heat together to invigorate convection were reasons for the heavier rainstorm when coupled AP.
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