论文标题
夜间使用卫星遥感光污染源的气雾剂表征
Aerosol characterization using satellite remote sensing of light pollution sources at night
论文作者
论文摘要
大气研究中的一个挑战是使用被动技术对气溶胶的夜间表征，也就是说，通过从观察者尚未发出的散射光中提取信息。人工夜间灯的卫星观测已被用来检索一些基本的积分参数，例如气溶胶光学深度。但是，对散射过程的彻底分析使人们可以获得有关气溶胶特性的更详细的信息。在这封信中，我们证明了一种可行的方法，可以根据从低地球轨道记录的夜间城市和城镇的夜间灯光发出的散射光的角度辐射分布来确定空气柱中的气溶胶粒度数量分布函数。该方法是自校准的，不需要绝对城市排放的知识。输入辐射数据很容易从多个Spaceborne平台获得，例如Suomi-NPP卫星的Viirs-DNB辐射计。
A demanding challenge in atmospheric research is the night-time characterization of aerosols using passive techniques, that is, by extracting information from scattered light that has not been emitted by the observer. Satellite observations of artificial night-time lights have been used to retrieve some basic integral parameters, like the aerosol optical depth. However, a thorough analysis of the scattering processes allows one to obtain substantially more detailed information on aerosol properties. In this Letter we demonstrate a practicable approach for determining the aerosol particle size number distribution function in the air column, based on the measurement of the angular radiance distribution of the scattered light emitted by night-time lights of cities and towns, recorded from low Earth orbit. The method is self-calibrating and does not require the knowledge of the absolute city emissions. The input radiance data are readily available from several spaceborne platforms, like the VIIRS-DNB radiometer onboard the Suomi-NPP satellite.
