A Simple Empirical Equation to Calculate Cloud Optical Thickness Using Shortwave Broadband Measurements
- 1 July 2004
- journal article
- Published by American Meteorological Society in Journal of Applied Meteorology and Climatology
- Vol. 43 (7), 1057-1066
- https://doi.org/10.1175/1520-0450(2004)043<1057:aseetc>2.0.co;2
Abstract
In this paper, an empirical equation is presented that can be used to estimate shortwave cloud optical thickness from measurements and analysis of shortwave broadband irradiances. When applied to a time series of broadband observations, this method can predict cloud optical thickness distributions that are very similar to those obtained using the algorithm of Min and Harrison (henceforth the Min algorithm). For a given site, medians of the Min algorithm–derived and empirically derived distributions differ by less than 10%. This level of agreement holds over a wide geographical range of sites. The equation is designed for fully overcast skies, surface albedos less than 0.3, and a cosine of the solar zenith angle greater than 0.15.Keywords
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