Cloud screening algorithm for AERONET database

Jinhuan Qiu

doi:10.1117/12.619648

12 May 2005 Cloud screening algorithm for AERONET database

Jinhuan Qiu

Proceedings Volume 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies; (2005) https://doi.org/10.1117/12.619648
Event: Optical Technologies for Atmospheric, Ocean, and Environmental Studies, 2004, Beijing, China

Abstract

A reasonable cloud screening algorithm is very important to ensure accuracy of aerosol optical thickness determinations from AERONET database. In this paper, a new cloud screening algorithm is developed. The algorithm uses cloud fraction and a so-called scaling height of the tropospheric aerosol, derived from sunphotometer measurements and surface visibility data, to build the screening criterion. The criterion constraints the scaling height varying in some range. In the condition of no cloud day, the variation range is the monthly-mean scaling height plus 3σ (σ: the standard deviation of scaling height). The larger the cloud fraction is, the smaller the range. The new cloud screening algorithm is used to determine aerosol optical thicknesses from AERONET data measured in Beijing during 2001-2002. According to the application results, the reasonableness of the new algorithm is analyzed.

Citation Download Citation

Jinhuan Qiu "Cloud screening algorithm for AERONET database", Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); https://doi.org/10.1117/12.619648

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