项目名称: 利用星光光谱提取大气气溶胶光学参数的方法及观测研究
项目编号: No.41475026
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 天文学、地球科学
项目作者: 段民征
作者单位: 中国科学院大气物理研究所
项目金额: 120万元
中文摘要: 气溶胶的长期连续观测对于全球变化、生态环境(包括城市居住环境)、资源探测和军事应用都具有重要作用。目前,气溶胶光学遥感无论是卫星还是地基观测大都局限于白天。由于信号较弱并易受到星光、月光和城市灯光的污染,夜间气溶胶的探测和遥感受到了很大局限,可用数据很少。2011年搭载有夜间通道的美国新一代卫星VIIRS/NPP的升空为夜间气溶胶遥感提供了数据支撑,但其数据质量还缺乏地面观测的验证。基于此,并为我国下一代夜间大气气溶胶卫星遥感探测提供验证手段和技术支撑,我们提出利用2.16米天文望远镜与卡谱仪对稳定恒星进行光谱观测,并结合地面全天空红外云像仪及其他辅助观测,实现夜间大气气溶胶光学厚度的反演,并在此基础上分析气溶胶的日(昼夜)变化特征。
中文关键词: 气溶胶;恒星;光谱;遥感
英文摘要: Long-term records of aerosol optical properties is very important in climate, eco-environment(including urban environment)、resource survey and military attack. Currently, aerosol optical properties are mostly acquired during daytime by optical sensor, night-time aerosol data are scarcely observed and used because of the weak radiance of star light and it's easier-contaminated by other star lights, moonlit and urban light. The new generation satellite sensor, VIIRS/NPP, with Day-and-Night Band, launched in Oct., 2011 and provide us the data of nocturnal aerosol optical properties, but should be used carefully before strict validation. Therefore, a new method is proposed to retrieve the aerosol optical depth from ground-based observation of the star spectrograph with the 2.16m astronaut telescope, meanwhile, the infrared whole sky imager and other facility will be used to acquire the star spectroscopy. Furthermore, the day and night variation of the aerosol optical depth will be analyzed. The fulfillment of this project will provide us the validation method for our new night-time satellite sensor.
英文关键词: Aerosol;Star;sepctroscopy;remote sensing