浅对流云对污染物的垂直输送机制研究

项目名称： 浅对流云对污染物的垂直输送机制研究

项目编号： No.41275144

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 薛惠文

作者单位： 北京大学

项目金额： 80万元

中文摘要： 很多研究表明，对流云对污染物的垂直输送起着非常重要的作用：深对流云能够将污染物从边界层输送到对流层上部；而浅对流云不仅可以在边界层内部对垂直混合起着重要作用，也可以在边界层顶通过云的抽吸作用（cumulus venting 或cumulus pumping effect），将污染物传输到边界层以上。本项目研究浅对流云对污染物的垂直输送,重点揭示浅对流云垂直输送污染物的物理和化学机制,具体研究浅对流云如何将近地面污染物向上传输到边界层以外，又如何将边界层以上的污染物向下传输到边界层内。本项目采用云分辨模式（大涡模拟模式与包含详细微物理过程及化学过程的云滴分档模式耦合），不仅可以分辨云的动力结构，还可以详细模拟云的微物理过程和化学过程。本项目的结果可以帮助我们进一步理解对流云对污染物的垂直传输机制，从而可以帮助我们更好地模拟及预报边界层内的污染物浓度。

中文关键词： 积云；垂直输送；气溶胶；污染物；云分辨模式

英文摘要： Previous studies indicate that convective clouds are very important in transporting pollutants vertically: Deep convective clouds can transport pollutants out of the boundary layer and to the upper troposphere; Shallow convective clouds can not only enhance the vertical mixing of pollutants in the boundary layer, but also transport pollutants to the outside of the boundary layer through the cumulus venting or cumulus pumping effect. This project investigates the vertical transport of pollutants by shallow cumulus clouds. The focus is to elucidate the physical and chemical mechanisms of the vertical transport, including the transport of pollutants from the surface upward to the heights above the boundary layer and the transport of pollutants from outside of the boundary layer downward to the inside of the boundary layer by shallow cumulus clouds. This project uses a cloud resolving model (large eddy simulation model coupled with droplet bin microphysical scheme) to study the cloud dynamical structure, the microphysical and chemical processes, the interactions between microphysics and dynamics, and the scavenging of aerosols and soluble trace gases by cloud particles. Results from this study can be used to understand the mechanisms of vertical transport of pollutants by convective clouds. This can help to model an

英文关键词： convective clouds；vertical transport；aerosol；pollutant；cloud resolving model