THE SOLAR ULTRAVIOLET RADIATION ENVIRONMENT IN THE WASHINGTON-BALTIMORE METROPOLITAN AREA

摘要

The urban Baltimore UVB irradiance was very similar to that of a nearby urban measurement location at Beltsville, MD. A positive correlation between UVB and surface 7-h mean [O_3], was observed for both urban and suburban locations; likely due to the influence of clouds on overall UVB irradiance. The urban Baltimore UVB irradiance was significantly different from that of the more rural Queenstown location with daily exposures 4% lower in Baltimore. Differences were greatest during the afternoon-again possibly due to cloud cover. The ability to relate differences in the rural and urban environments to differences in UVB irradiance was limited by the high frequency of nearby frontal systems during the study period. Supplementary air quality measurements greatly enhance the value of the UVB monitoring in urban areas.