Instrument calibration and aerosol optical depth validation of the China Aerosol Remote Sensing Network
Instrument calibration and aerosol optical depth validation of the China Aerosol Remote Sensing Network
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DOI：
10.1029/2008jd011030
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发表时间：
2009-02-14
影响因子：
4.4
通讯作者：
Zhou, Tianming
中科院分区：
文献类型：
--
作者：
Che, Huizheng;Zhang, Xiaoye;Zhou, Tianming
本文介绍了中国气溶胶遥感网（CARSNET）CE-318太阳光度计的定标，以及利用ASTPWin软件的气溶胶光学厚度（AOD）模块与AERONET/Photometrie pour le Traitement Operationnel de Normalization Satellaire（PHOTONS）和PREDE天空辐射计同步测量数据的对比验证。结果表明，CARSNET AOD测量与AERONET/PHOTONS具有相同的精度。在CARSNET和AERONET之间的比较的基础上，CARSNET在1020、870、670和440 nm处的AOD分别比AERONET大约0.03、0.01、0.01和0.01。利用AERONET/PHOTONS站点和CARSNET站点的CE-318太阳光度计对北京地区气溶胶光学特性进行了4年的观测分析。上店子站（农村站）的气溶胶光学厚度明显低于两个城市站（北京市大气物理研究所站（北部城市站）和北京市气象台站（南部城市站））。在1020、870、670和440 nm波长处，BJO的气溶胶光学厚度分别比IAP大0.05、0.04、0.05和0.06，表明北京南部局地污染较严重。夏季气溶胶光学厚度最高，是由于大气边界层的停滞和北京以南大污染中心的污染物输送。夏季高温高湿有利于气溶胶前体物的生成和局部颗粒物的吸湿生长，从而导致气溶胶光学厚度的升高。而北京两个城市站点和一个农村站点的气溶胶光学厚度最低值出现在冬季，因为频繁的冷空气团有助于污染物的扩散。
This paper introduced the calibration of the CE-318 sunphotometer of the China Aerosol Remote Sensing Network (CARSNET) and the validation of aerosol optical depth (AOD) by AOD module of ASTPWin software compared with the simultaneous measurements of the Aerosol Robotic Network (AERONET)/Photometrie pour le Traitement Operationnel de Normalization Satellitaire (PHOTONS) and PREDE skyradiometer. The results show that the CARSNET AOD measurements have the same accuracy as the AERONET/PHOTONS. On the basis of a comparison between CARSNET and AERONET, the AODs from CARSNET at 1020, 870, 670, and 440 nm are about 0.03, 0.01, 0.01, and 0.01 larger than those from AERONET, respectively. The aerosol optical properties over Beijing acquired through the CE-318 sunphotometers of one AERONET/PHOTONS site and two CARSNET sites were analyzed on the basis of 4-year measurements. It was obvious that the AOD of the Shangdianzi site (rural site) was lower than that of the two urban sites (the Institute of Atmospheric Physics (IAP) site (north urban site) and the Beijing Meteorological Observatory (BJO) site (south urban site)). The AOD of BJO was about 0.05, 0.04, 0.05, and 0.06 larger than that of IAP at 1020, 870, 670, and 440 nm, respectively, indicating that there is more local pollution in the south part of Beijing. The highest AOD was found in summer because of the stagnation planetary boundary layer and transport of pollutants from large pollution centers south of Beijing. The high temperature and relative humidity in summer also favor the production of aerosol precursor and the hygroscopic growth of the existing particles locally, which results in high AOD. In contrast, the lowest AOD at the two urban sites and one rural site in Beijing occurred in winter as the frequent cold air masses help pollutants diffuse easily.