Source apportionment of wet sulfate deposition in eastern North America
Name
EL_TR_1985_001.pdf
Size
1.4 MB
Format
Adobe PDF
Checksum (MD5)
7eeee5dea7c18ccdb65e99c7c4685289
Author(s)
Fay, James A.
Golomb, D.
Kumar, Subramanyam
Alternative Title
Wet sulfate deposition in eastern North America, Source apportionment of.
Date Issued
1985
Publisher
[Cambridge, Mass.] : Massachusetts Institute of Technology, Energy Laboratory, 1985
Series/Report no.
Energy Laboratory report (Massachusetts Institute of Technology. Energy Laboratory) no. MIT-EL 85-001.
Abstract
An analytical model of long distance transport of air pollutants (Fay and Rosenzweig, 1980) has been adapted for the estimation of long term (e.g. annual) wet sulfate deposition in eastern N. America. The model parameters have been optimized for best agreement with 1980- 1982 measurements at 109 monitoring sites in this region. The mean residual of the model and measurement comparison is 4 kg ha[superscript -l]y[superscript -1] (17% of the mean measured value). Transfer coefficients were found to decrease exponentially with source-receptor distance, having length scales between 1100 and 400 km depending upon whether the source is upwind or downwind of the receptor. Source apportionment calculated for four sites from this model shows that about half of the deposition is due to 7-8 of the largest source contributors to each site (aggregated to the state and sub-province level). A 17-year record of precipitation sulfate measured at Hubbard Brook, New Hampshire, compares favorably with the model calculation. Calculated U.S.-Canada transboundary fluxes agree with previous estimates. Isopleths of 1980-82 yearly depositions were determined, and the deposition effects of a typical U.S. emissions reduction proposal were evaluated.
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