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A comparison of urban and suburban precipitation chemistry
Institution:1. School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, PR China;2. School of Computer Science and Technology, Hubei University of Science and Technology, Xianning 437100, PR China;3. Laboratory of Optoelectronic Information and Intelligent Control, Hubei University of Science and Technology, Xianning 437100, PR China
Abstract:Precipitation samples at an urban Chicago site and a nearby suburban site were compared in order to examine the influence of emissions within a large urban area on local precipitation chemistry. Precipitation samples were collected from June 1981 to May 1982, initially for events and subsequently weekly, and precipitation-weighted concentrations (PWCs) of the major chemical constituents were calculated from concurrent urban-suburban pairs of samples, stratified according to the estimated mixed-layer wind quadrant. Overall, PWCs at the urban site were higher than those at the suburban site for Ca2+, Mg2+, NH4+, NO3 and Cl; approximately equal for Na+ and SO42−; and lower for H+. For precipitation in southwesterly flow, in which the suburban site was upwind of the urban site and most urban emissions, PWCs of all species except Na+ were higher at the urban site. For the few precipitation cases in northeasterly flow, however, differences between sites did not have a pattern consistent with a reversal in the upwind-downwind relationship.
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