Relationships between aerosol optical depth and surface-layer extinction in the central part of the Upper Silesia industrial region over the period of 1983-1994

摘要

The subject of analysis is the aerosol optical depth (AOD) in the visible part of the solar spectrum (tau(vis),) (wavelength = 0.295 - 0.695 pm). Calculation of tau(vis)-values was based on pyrheliometric observation data performed from 1983 to 1994 at IEIA's station (Katowice-Zaleze).This paper examines the dependence of tau(vis) and its relation to surface-layer extinction coefficient sigma (Koschmider quotient of 3.912 and visibility V) on meteorological and anthropological factors during the observation period. Knowledge of the relationship between columnar aerosol turbidity (which can be expressed by tau(vis)) and sigma allows a more precise and accurate estimation of the aerosol effect on the radiative composition of climate. This work offers some contributions to solving this problem. Therefore, the relations have been described in the form of mathematical/ statistical models of AOD (based on "momentary" and mean seasonal values), in which meteorological (and astronomical) parameters as well as the amount of industry dust emission were used as independent variables to improve exactness and credibility in the models. (c) 2004 Elsevier Ltd. All rights reserved.