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Published December 1993 | public
Journal Article

Mathematical modeling and control of the dry deposition flux of nitrogen-containing air pollutants

Abstract

An Eulerian grid-based air quality model has been modified to include a resistance-based dry deposition code. The magnitude and spatial distribution of the dry deposition flux of nitrogen-containing pollutants to the surface of the Los Angeles area was calculated as a function of land use. For August 1982 base case conditions, the dry deposition flux was 247 t of N per day (5 from NO, 49 from NO_2, 7 from PAN, 101 from HNO_3, 59 from NH_3, and 26 from NH4_NO_3), which corresponds to more than half of the daily NO_x emissions to the local atmosphere. The effects of emission controls on NO_x and hydrocarbon sources in Southern California as they existed in 1982 were examined. At the highest level of control studied (37% reactive hydrocarbon reduction, 61 % NO_x reduction), the nitrogen dry flux would be 174 t of N per day after control (2 from NO, 20 from NO_2, 7 from PAN, 58 from HNO_3, 75 from NH_3, and 12 from NH_4NO_3.

Additional Information

© 1993 American Chemical Society. Received for review February 9, 1993. Revised manuscript received May 19, 1993. Accepted June 28, 1993. This research was supported by the California Air Resources Board under Agreement A6-188-32 and by the Center for Air Quality Analysis at Caltech.

Additional details

Created:
August 20, 2023
Modified:
October 25, 2023