基于地基偏振观测研究北京城区北部大气气溶胶特性变化
Aerosol Property Change Study in North City of Beijing Based on the Ground-based Polarized Measurement
- 2008年第3期 页码:490-498
纸质出版日期: 2008
DOI: 10.11834/jrs.20080366
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纸质出版日期: 2008 ,
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[1]怀红燕,李正强,陈良富,王中挺,顾行发.基于地基偏振观测研究北京城区北部大气气溶胶特性变化[J].遥感学报,2008(03):490-498.
HUAI Hong-yan~. Aerosol Property Change Study in North City of Beijing Based on the Ground-based Polarized Measurement[J]. Journal of Remote Sensing, 2008,(3):490-498.
利用位于北京城区北部AERONET网北京站点2005—2006年地基观测数据
对比分析了AERONET观测网使用的气溶胶参数反演算法与加入偏振信息后的气溶胶参数反演算法精度。结果表明
加入865nm偏振信息后的气溶胶参数反演具有更高的精度。在此基础上
基于两种算法反演获得的北京站点2005年和2006年气溶胶光学参数和物理参数
对奥运工地建设区气溶胶特性的变化情况进行了详细的分析。结果表明:(1)2006年的光学厚度有所增大
气溶胶的粒径也同时有所增大;(2)2006年的气溶胶单次散射反照率基本比2005年低0.05左右
位于0.85左右的水平
而且夏季更低
达0.80附近
说明2006年气溶胶具有更强的吸收特性;(3)偏振相函数值与Angstrom指数值变化是一致的;(4)两年的气溶胶粒子谱形态均表现出北京北部城区气溶胶双峰型分布特点
但2006年双峰的粒子半径均比2005年的偏大一些。
Aerosol is a key element in many research fields
such as climate changes
environment study
pollution monitoring and ground object recognition all over the world.Now the space-borne sensors have widely applied to monitor the aerosol optical properties.But there are several problems within the inversion of aerosol properties.One is the aerosol model which changes with place and season.The aerosol model can be studied through a large size of ground based meas- urement.This is the motive of establishment of AERONET(Aerosol Robotic Network)
which aims to study the world wide aerosol model using solar spectrophotometer.In Beijing
there are two AERONET observation stations
one is located in the north
the another is in the south.The north one is near the Beijing Olympic Game’s site
where were lots of pro- jects constructions from 2005.The AERONET ground measurements can be used to study the local aerosol model.Dubo- vik and King had developed a method to derive aerosol optical thickness
single scattering albedo
Angstrom exponent and polarized phase function based on four band measurements.This method is used to produce the aerosol products in AERO- NET.We used a new algorithm put forward by Li Zheng-qiang based on a polarized band measurement besides the four bands to derive more aerosol properties.The properties aerosol includes the optical properties
such as aerosol optical thickness
single scattering albedo
Angstrom exponent and polarized phase function.It also includes the physical proper- ties
such as particle size and refraction index.Based on the north AERONET observation in Beijing near Beijing Olympic Game’s site in 2005 and 2006
we compared the results from the two different retrieval algorithms.The optical and physi- cal aerosol properties had been retrieved based on ground measurements of 2005 and 2006.Then the optical and physical aerosol properties had been used to analyse the aerosol property annuel change because of the Olympic Game’s architecture projects around Beijing site.The results show that(Ⅰ)the aerosol optical thickness is getting high
and the Angstrom exponent is getting low from 2005 to 2006.It means that the project construction brought more dust.(Ⅱ)The average single scattering albedo in 2006 retrieved from the measurements is round 0.85
it is about 0.05 lower than the average value in 2005.The lower single scattering albedo indicates the stronger absorbability of aerosol particle in 2006.(Ⅲ)We also got the polarized phase function from polarized band measurements
and it changes with the Angstrom exponent. (Ⅳ)The tow-year measurements both reveal the aerosol particle size in north city of Beijing is bimodal lognormal distribu- tion.The peak values of two bimodal lognormal distribution in 2006 are higher than those in 2005.It means more granules and large particles in 2006 in north Beijing had been produced by the construction.
气溶胶参数反演偏振AERONET网北京站点
aerosol parameter retrievalpolarizationBeijing site of AERONET
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