南昌地区黑碳气溶胶的降水清除系数、效率与作用机制

项目名称： 南昌地区黑碳气溶胶的降水清除系数、效率与作用机制

项目编号： No.41265009

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 黄虹

作者单位： 南昌大学

项目金额： 53万元

中文摘要： 黑碳气溶胶对气候、环境等具有重要影响，降水作为重要的汇，直接影响其污染状况，间接影响其气候、环境效应。然而目前黑碳气溶胶的降水清除研究少见，清除作用定量化研究鲜见，作用机制尚不明确，因此黑碳气溶胶的降水清除效果和作用机制有待系统深入研究。本研究拟在南昌开展大气和降水中黑碳的同步观测，用SP2仪监测降水过程黑碳气溶胶的粒径和浓度，计算其降水清除系数，讨论控制因素；用TOR法测定降水中黑碳，结合降水时黑碳气溶胶浓度，计算其降水清除效率，明晰控制因素；基于气溶胶湿清除理论，利用所得降水清除系数、黑碳粒子粒径分布和雨滴谱分布，计算雨滴与黑碳的碰撞系数，模拟、探讨其降水清除机制。本项目旨在建立气溶胶湿清除研究新方法，掌握南昌大气、降水中黑碳分布规律，获得黑碳气溶胶的降水清除系数和效率，并揭示清除机制；为黑碳气溶胶污染预测、气候/环境效应评估、碳汇准确定量提供科学依据，丰富和完善气溶胶湿清除机制理论。

中文关键词： 黑碳气溶胶；气溶胶；降雨；湿清除；机制

英文摘要： Black carbon aerosols have a great impact on the climate and environment. As an important sinks of black carbon aerosols, precipitation not only affects black carbon pollution situation directly, but also affects its climate and environmental effects indirectly. However，there is a lack of researches on black carbon aerosol scavenging by precipitation, few related scavenging coefficient and efficiency of black carbon aerosols by precipitation has been found, and understanding about scavenging mechanism is also not enough. In this study, observation of the black carbon aerosols in the atmosphere and precipitation will be carried out simultaneously in Nanchang. In order to calculate scavenging coefficient, single Particle Soot Photometer (SP2) will be used to monitor particle size and concentration distributions of black carbon aerosols in the process of precipitation. Then influencing factors of scavenging coefficient will be discussed. Black carbon in precipitation is determined by using DRI-2001 Carbon Analysis Instrument (TOR method, IMPROVE protocol) to calculate its scavenging efficiency. Also influencing factors of scavenging efficiency will be discussed. Basing on Wet Scavening Theory of Aerosol, collision coefficient between raindrops and black carbon particles is calculated by combining obtained scavengin

英文关键词： Black carbon aerosol；Aerosol；Precipitation；Wet Scanvenging；Mechanism