Abstract
Abstract The results of an analysis of simultaneous measurements of incident solar radiation from six locations in metropolitan St. Louis, Missouri are described. The measurements were taken continuously from September 1975 through March 1977 with pyranometers with all-wave and 395 and 695 nm cutoff filters. This report documents typical urban-rural variations of incident solar radiation. Atmospheric pollutants over the center of metropolitan St. Louis reduced incident all-wave solar irradiation by ∼3%. Under cloudless conditions, differences between urban and rural irradiation were ∼4.5% during winter and 2% in summer. At two suburban sites, the irradiation depletion averaged 1 and 2% for summer and winter seasons, respectively. Under all conditions, the ratios between stations for the complete experiment were similar to those for cloud-free conditions. Although the comparisons were stratified by wind direction and speed, visibility, time of day and day of the week, only wind direction had a significant ...
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