<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Heisler, G. M.</style></author><author><style face="normal" font="default" size="100%">Grant, R. H.</style></author><author><style face="normal" font="default" size="100%">Gao, W.</style></author><author><style face="normal" font="default" size="100%">Slusser, J. R.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Solar ultraviolet-B radiation in urban environments: the case of Baltimore, Maryland</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">BES</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><edition><style face="normal" font="default" size="100%">30 April 2007</style></edition><volume><style face="normal" font="default" size="100%">80</style></volume><pages><style face="normal" font="default" size="100%">422-428</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Ultraviolet-B radiation (UV-B, 280–320 nm) has important effects in urban areas, including those on human health. Broadband UV-B radiation is monitored in Baltimore, MD, as part of the Baltimore Ecosystem Study, a long-term ecological research program. We compare broadband UV-B irradiance in Baltimore with UV-B at two nearby locations: a more rural station 64 km southeast and a suburban station 42 km southwest. The monitoring station in Baltimore is on the roof of a 33-m-tall building; there are no significant obstructions to sky view. The U.S. Department of Agriculture UV-B Monitoring and Research Program provided all sensors, which were calibrated at the National Oceanic and Atmospheric Administration Central UV Calibration Facility. UV-B irradiances at the three sites generally were similar. Over all conditions, Baltimore and the suburban site measured 3.4% less irradiance than the rural site. This difference is within the anticipated ±3% calibration uncertainty of the pyranometers. On 59 days with cloud-free conditions at all three sites, average differences in measured UV-B among the three sites were even smaller; Baltimore measured 1.2% less irradiance than the rural site. High aerosol optical thickness strongly reduced daily UV-B dose, whereas [SO2] had no influence. Surface O3 increased with increasing UV-B dose when [NO2] exceeded 10 ppb.</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue><accession-num><style face="normal" font="default" size="100%">LTER.2004-85169</style></accession-num></record></records></xml>