2001 Blodgett Forest Research Symposium

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ABSTRACT 8 The Chemical Evolution of the Sacramento Urban Plume – Implications for Ozone within the Sierra Nevada Mountains Michael B. Dillon, J. A. Thornton, D. A. Day, P. J. Wooldridge, M. S. Lamanna, G. W. Schade, A. H. Goldstein, and R. C. Cohen

The Sacramento urban plume provides a unique opportunity to study the production and deposition of ozone and the coupling of ozone to the nitrogen oxide cycle. The mesoscale meteorological patterns in this region are extremely regular on daily, seasonal, and annual timescales. This regularity results in an reproducible daily plume evolution starting in the morning (10:00 PST) from the Sacramento urban core and ending in the late afternoon (17:00 PST) at the University of California – Blodgett Forest Research Station (UC-BFRS). We describe a Langrangian model of the Sacramento urban plume’s physical and chemical evolution constrained by observations of anthropogenic hydrocarbons, nitrogen oxides, and ozone in the Sacramento urban core and at the UC-BFRS. The model demonstrates the potential for soil emissions of nitrogen oxides to affect ozone abundances and deposition in the Sierra Nevada mountains.

Contact Author: Michael B. Dillon, Department of Chemistry, B45 Hildebrand Hall, University of California, Berkeley, Berkeley, CA 94720-1460, e-mail: dillon@uclink4.berkeley.edu Michael B. Dillon, J.A. Thornton, D.A. Day, P.J. Woodbridge, and R.C. Cohen Department of Chemistry, University of California, Berkeley, CA 94720-1460, USA Michael B. Dillon, A. H. Goldstein, and R.C. Cohen Energy and Environmental Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA M.S. Lamanna, G.W. Schade, and A. H. Goldstein Division of Ecosystem Sciences, Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720-3110, USA R.C. Cohen Department of Earth and Planetary Sciences, University of California, Berkeley, CA 94720-4767, USA

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