基于拉曼偏振雷达的城市细颗粒物光学-微物理特性研究

项目名称： 基于拉曼偏振雷达的城市细颗粒物光学-微物理特性研究

项目编号： No.41305126

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 陈臻懿

作者单位： 中国科学院合肥物质科学研究院

项目金额： 25万元

中文摘要： 城市细颗粒物引起的大气污染(如灰霾、光化学烟雾) 已对我国社会发展和人民生存环境造成严重影响和危害，是亟待解决的首要环境问题之一。城市细颗粒物的光学物理特性是分析大气城市灰霾成因和污染物传输的重要参数。目前国内在细颗粒物化学构成、来源解析及毒性机理方面开展了相关分析，但在城市细颗粒物光学-微物理特性和垂直分布特征方面缺乏综合研究。因此采用有效的探测技术对细颗粒物进行特征参数的遥测研究，具有重要科学意义和应用价值。 本课题主要开展基于激光雷达的城市细颗粒物特性参数测量方法研究，利用双波段拉曼偏振雷达进行米-拉曼信号联合算法反演，获取光学特性参数；开展激光雷达与太阳光度计的协同测量和数据融合研究，建立迭代比对模型，获取微物理特性参数；探索不同气溶胶类型模态和化学构成下，相对湿度对颗粒物的影响，进行模型修正；根据已获参数和Mie理论数值模拟散射-质量浓度转换因子，获取质量浓度时空分布特征。

中文关键词： 拉曼激光雷达；气溶胶；消光系数；质量浓度；

英文摘要： Urban fine particles,which lead to the severe air pollution (eg haze ,photochemical smog ), have endangered the social development and caused great harm to the human health.It becomes one of the most urgent environmental problems to be solved in the recent years.And the optical-physical properties of the fine particles are important parameters to analyze the cause of haze and pollution transportation.However at present,although many researches have been focused on the chenmical composition, souce appointment and toxic mechanism ,the fine particles are still lack of comprehensive inversion model for the optical-microphysical properties and its vertical distribution in our country. So to develop an effective remote sensing technology and retrieval model for the urban fine particles have important scientific significance and application value. In this study firstly the optical properties retrieval algorithm based on the Raman-Polarized lidar is improved. Then the microphysical properties retrieval model is investigated together with the data fusion from the sunphotometer . The impact of relative humidity on the soluble particles is discussed to make correction for the model under different particle modes and chemical composition. The scatter-mass concentration conversion factor is also discussed to get the mas

英文关键词： Raman lidar；aerosol；extinction coefficient；mass concentration；