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### 现行POLDER陆地气溶胶偏振反演算法对粒子尺度的敏感性分析

1. 阜阳师范学院物理系,阜阳 236037
• 收稿日期:2013-08-09 修回日期:2014-01-21 出版日期:2014-09-10 发布日期:2014-09-04
• 作者简介:

作者简介：王家成(1968-),男,博士,副教授,主要从事光学遥感与应用方面的研究。E-mail：shanqiangw@fync.edu.cn

• 基金资助:
国家自然科学基金项目“耀变体多波段光变特征研究”(11273008);安徽省自然科学基金“气溶胶微物理性质参量反演研究”(1408085MD70)

### The Sensitivity of the Current POLDER Land Aerosol Polarized Retrieval Algorithm to Particle Size

WANG Jiacheng*()

1. Physics department, Fuyang Teachers College, FuYang 236037, China
• Received:2013-08-09 Revised:2014-01-21 Online:2014-09-10 Published:2014-09-04
• Contact: WANG Jiacheng E-mail:shanqiangw@fync.edu.cn
• About author:

*The author: WANG Jiacheng, E-mail：shanqiangw@fync.edu.cn

Abstract:

One of the polarized remote sensing advantages is its insensitivity to the land surface reflection, and now it has been widely used for aerosol properties retrieval from satellite and ground-based remote sensing. As to aerosols, the polarized remote sensing is only sensitive to small particles; however, there are different understandings of the small particle size to which extend the polarized remote sensing is sensitive. For example, some studies take fine mode aerosols as small particles, but the maximum radius of fine mode aerosol varies between 0.4~1.0$μm$. What’s the upper threshold of the particle size to which the polarized remote sensing is sensitive? In order to determine the sensitivity of the polarized remote sensing to aerosol particle size, three steps are conducted as follows: firstly, the POLDER (Polarization and Directionality of the Earth’s Reflectances, which is equipped on Polarization and Anisotropy of Reflectances for Atmospheric Science coupled with Observations from a Lidar) and AERONET (Aerosol Robotic Network) data in Hefei between 2007 and 2008 are collected and processed, i.e. the AERONET data within a 1-hour range window (±30min) around the POLDER during zenith pass and the POLDER data in a 3×3 pixel box centered on the Hefei site are averaged in time and space respectively. Secondly, the aerosol optical depths in different particle size range are calculated using the refractive index and size distribution data from Hefei site according to Mie theory. Finally, the particle size to which the polarized remote sensing is sensitive is determined by finding the best fit between the POLDER aerosol optical depth and the AERONET aerosol optical depth calculated above. The results show that the polarized remote sensing is not sensitive to all the fine mode particles, but sensitive to particles with radius approximately less than 0.3μm at 865nm band. The results will not only help us to understand and utilize the aerosol products obtained from the polarized remote sensing, but also help us in polarized remote sensing application.