An Objective Method for Assessment of Langley Calibrations of Sunphotometer
Received:June 28, 2018  
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KeyWord:Langley calibration method  multi-filter rotating shadowband radiometer (MFRSR)  Aerosol  SBDART radiative transfer model
Author NameAffiliationE-mail
DONG Zipeng Meteorological Institute of Shaanxi Province, Xi'an 710016
College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
YU Xing Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
LU Di Shaanxi Meteorological Service Center, Xi'an 710014  
DAI Jin Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
LI Xingmin Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
lixingmin803@163.com 
CHEN Chuang Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
PENG Yan Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
DONG Yan Meteorological Institute of Shaanxi Province, Xi'an 710016
Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710014 
 
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Abstract:
      Atmospheric aerosols play a critical role in many aspects of climate, environmental, and human health problems and have attracted increasing attention in recent years. It is of great importance to retrieve aerosol optical depths (AODs) accurately. Calibration of the direct solar radiation data obtained by sun photometers is a key step in obtaining accurate AODs. Unfortunately, there are significant errors in the AODs obtained for heavily polluted regions, such as most parts of China, by the use of incorrect solar calibration constants determined by the widely used Langley method. To overcome this problem, in this paper, we propose a method for performing an objective assessment of Langley calibrations that combines the surface shortwave radiation observed by a pyrheliometer with the SBDART atmospheric radiative transfer model. We verified the feasibility of the proposed method using two and a half years of solar radiation data obtained by the multi-filter rotating shadowband radiometer and the normal incidence pyrheliometer. The results showed that the accuracy of the AOD retrievals was improved and the solar calibration constants could be constrained to a set of stable values.