兰州地区黑碳和沙尘气溶胶偏振特性观测研究

项目名称： 兰州地区黑碳和沙尘气溶胶偏振特性观测研究

项目编号： No.41205112

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 大气科学学科

项目作者： 曹贤洁

作者单位： 兰州大学

项目金额： 26万元

中文摘要： 气溶胶辐射效应是气候变化研究中亟待解决的一个重要问题，而准确理解气溶胶辐射特性及其时空分布特征是其关键之一。兰州地区属于典型的干旱半干旱地区，近三十年来在气溶胶辐射效应和参数化研究方面取得了重要成果。然而观测条件所限，多数研究都基于气溶胶球形粒子假设，不可避免地导致一定误差。偏振激光雷达提供了改进此类不足的手段。本项目依托于兰州大学半干旱气候变化教育部重点实验室和半干旱气候与环境观测站，利用偏振激光雷达、太阳光度计、积分浑浊度仪和尺度谱仪等国际先进仪器，开展目标明确的气溶胶偏振特性研究，揭示兰州地区黑碳和沙尘气溶胶退偏振比、消光和散射系数垂直分布特征和光学厚度时间变化特征，利用T-矩阵方法，计算兰州地区气溶胶单次散射反照率、不对称因子、粒子有效半径等重要参数，掌握气溶胶粒子形状和大小信息，有助于更准确地计算气溶胶辐射特性，为合理确定气溶胶辐射参数化方案提供可靠的观测依据。

中文关键词： 沙尘气溶胶；黑碳；辐射效应；偏振；

英文摘要： The aerosol radiative effect is the important issue in the research of climate change and needs to be solved urgently. One of the key work is understanding the radiative properties of aerosol ant its characteristics of spatial distribution and temporal evolution. Lanzhou is located in the arid and semi-arid region of northwest China. In the recent three decades much important progress have been archieved in the research of aerosol radiative properties and its parameterization. While due to the limitation of observation measurement, most research were based on the assumption of spheric shape of aerosol particles, which inevitably will cause calculation error of aerosol radiative effects in a certain degree. And the depolarization lidar provides a powerful mean to improve such defect. This research project is relied on the Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, and the Semi-Arid Climate and Environment Observatoy of Lanzhou University and targeted to the depolarization properties of black carbon and dust aerosol over Lanzhou, China using the most advanced measurements of depolarization lidar, sunphotometer, integrating nephelometer, and aerodynamic particle sizer, which obviously will strengthen the recently started depolarization study in Lanzhou, China by revealing the characte

英文关键词： Dust aerosol；Black carbon；Radiative effect；Depolarization；