关中盆地不同来源黑碳气溶胶混合状态特征及其对光学性质的影响

项目名称： 关中盆地不同来源黑碳气溶胶混合状态特征及其对光学性质的影响

项目编号： No.41503118

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 王启元

作者单位： 中国科学院地球环境研究所

项目金额： 21万元

中文摘要： 黑碳气溶胶是大气环境中最主要的颗粒态吸光物质，对灰霾形成具有重要贡献。同时，黑碳气溶胶是继二氧化碳之后，引起全球增温的第二个重要因子。然而，黑碳气溶胶对空气质量和气候变化的影响仍存在很大的不确定性，其中黑碳气溶胶混合状态对其吸光性的不确定性尤为突出。本研究拟针对黑碳气溶胶来源、混合状态及其光学特性开展研究工作。通过采用不同实时、在线气溶胶分析手段在污染严重的关中地区（西安和华山）进行为期一年的同步观测，获得不同季节不同排放源对黑碳气溶胶的贡献；进一步探讨黑碳气溶胶混合状态与有机气溶胶及二次无机气溶胶的关联性，揭示黑碳气溶胶混合状态演变规律；并通过分析气溶胶混合状态对黑碳气溶胶光学性质的影响，定量认识黑碳对气溶胶光学性质和辐射强迫的作用，为气溶胶污染减排和减小气候模型的不确定性提供数据支持。

中文关键词： 黑碳气溶胶；混合状态；光学性质

英文摘要： Black carbon (BC) aerosol is the main light-absorbing material in the atmospheric environment, and it plays an important role in haze formation. It has also been considered as the second largest contributor to anthropogenic radiative forcing after carbon dioxide. However, there are still large uncertainties about the influence of BC on air quality and climate change, partly due to the complexity of BC mixing state. In this project, we will take one year (four seasons) aerosol measurements at the heavily polluted Guanzhong region (Xi’an and Mt. Hua) using a set of high time resolution instruments. The contributions of BC aerosol from different sources during the four seasons will be quantified. The correlation of BC with organic aerosol and secondary inorganic aerosol will be studied to get new insights into the BC mixing state mechanism in highly polluted air. Further, the influence of BC mixing state on its optical properties will be investigated to better understand the impact of BC on aerosol optical properties and direct radiative forcing. The results obtained will provide useful dataset for reducing particle air pollution and improving model uncertainties of the climate effects of BC aerosol.

英文关键词： Black Carbon Aerosol;Mixing State;Optical Properties