| 一种改进的TSI3563积分浊度误差校正方法 |
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| 引用本文： | 马楠,周秀骥,颜鹏,赵春生.一种改进的TSI3563积分浊度误差校正方法[J].应用气象学报,2015,26(1):12-21. |
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| 作者姓名： | 马楠 周秀骥 颜鹏 赵春生 |
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| 作者单位： | 1.北京大学物理学院大气与海洋科学系，北京 100871 |
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| 基金项目： | 资助项目：国家重点基础研究发展计划（2011CB403402），公益性行业（气象）科研专项（GYHY201006047，GYHY200906038），中国气象科学研究院基本科研业务专项课题（2008Z011） |
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| 摘 要： | TSI3563型积分式浊度计是一种性能出色的气溶胶散射系数观测仪器，然而由于仪器设计所固有的限制，TSI3563型浊度计观测结果包含有角度截断和非朗伯体光源两项系统性误差，会使观测结果较真值偏小10%左右。因此，需要对TSI3563型浊度计的观测结果进行校正才能得到较为精确的散射系数观测值。该研究利用2009年华北平原HaChi气溶胶外场观测数据测试了现有校正方法，结果显示，传统的校正方法在我国华北平原这样的高气溶胶污染地区并不适用。为此，提出一种改进的校正方法，利用同时观测的PM1和PM10数据，在校正方案中加入超微米粒子体积比这一参量，对于不同体积比采用不同的校正函数。利用实际观测数据检验后发现，改进方法的校正效果相对于传统方法有很大改善。
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| 关 键 词： | 气溶胶散射系数 TSI3563三波段积分浊度计 角度截断和非理想光源误差 |
| 收稿时间： | 3/2/2014 12:00:00 AM |
A Modified Method to Correct the Measurement Errorof TSI3563 Integrating Nephelometer |
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| Ma Nan,Zhou Xiuji,Yan Peng and Zhao Chunsheng.A Modified Method to Correct the Measurement Errorof TSI3563 Integrating Nephelometer[J].Quarterly Journal of Applied Meteorology,2015,26(1):12-21. |
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| Authors: | Ma Nan Zhou Xiuji Yan Peng and Zhao Chunsheng |
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| Affiliation: | 1.Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Bejing 1008712.Chinese Academy of Meteorological Sciences, Beijing 1000813.Meteorological Observation Center of CMA, Beijing 100081 |
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| Abstract: | TSI3563 integrating nephelometer is designed for high-quality in-situ aerosol scattering measurement, which is widely used all over the world. However, the scattering coefficient measured by TSI3563 nephelometer contain two systematic errors: The truncation error (i.e., the geometrical blockage of near-forward/backward-scattered light) and the non-Lambertian error (i.e., the slightly non-cosine weighted intensity distribution of illumination light provided by the opal glass diffusor). These errors need to be corrected since they can typically cause a bias of about 10% in the measured scattering coefficient. Based on the aerosol properties measured in North China Plain during Hachi (Haze in China) Project, the correction factor is calculated with a traditional method and the Mie model (taken as reference) which requires aerosol number size distribution and refractive index as input. The traditional correction method is widely used all over the world since it requires only data from nephelometer itself. However, results show the traditional method cannot provide a good estimation of the correction factor. Due to the high concentration of submicron aerosol in PM10, aerosol number size distributions measured in North China Plain are different from those assumed in the traditional method. The traditional correction method is therefore inadequate for high-aerosol pollution region like North China Plain. It is found that the correction factor is sensitive on the volume fraction of supermicron aerosol in PM10. Higher volume fractions would lead to higher correction factors. A modified correction method is proposed. The volume fraction of supermicron aerosol which can be obtained from PM1 and PM10 measurement is used in the new method. For different volume fractions, different parameters are chosen for the calculation of correction factors. Testing with aerosol properties measured in North China Plain, the modified method provided a good estimation of the correction factors. 80% of correction factors calculated with the modified method are with a bias less than 1% and 100% are with a bias less than 3%. Compared with the traditional method, a distinct improvement is found in correction results. It suggests that to estimate the correction factor for TSI3563 nephelometer measurement, the Mie model should be the first choice if a real-time measurement of aerosol number size distribution is available. Otherwise, the modified method proposed should be used if a real-time PM1 and PM10 measurement is available. Without those parallel measurements, the traditional method can be the last choice to estimate the correction factor. |
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| Keywords: | aerosol scattering coefficient TSI3563 integrating nephelometer truncation and non Lambertian error |
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