Budget of tropospheric ozone during TOPSE from two chemical transport models

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Read Full Article (file size: 13456660 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D8, 8372, doi:10.1029/2002JD002665, 2003 Budget of tropospheric ozone during TOPSE from two chemical transport models L. K. Emmons Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA P. Hess Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA A. Klonecki Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA X. Tie Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA L. Horowitz Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, New Jersey, USA J.-F. Lamarque Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA D. Kinnison Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA G. Brasseur Max Planck Institute for Meteorology, Hamburg, Germany E. Atlas Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA E. Browell Atmospheric Sciences, NASA Langley Research Center, Hampton, Virginia, USA C. Cantrell Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA F. Eisele Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA R. L. Mauldin Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA J. Merrill Graduate School of Oceanography, Center for Atmospheric Chemistry Studies, University of Rhode Island, Narragansett, Rhode Island, USA B. Ridley Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA R. Shetter Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA Abstract The tropospheric ozone budget during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) campaign has been studied using two chemical transport models (CTMs): HANK and the Model of Ozone and Related chemical Tracers, version 2 (MOZART-2). The two models have similar chemical schemes but use different meteorological fields, with HANK using MM5 (Pennsylvania State University, National Center for Atmospheric Research Mesoscale Modeling System) and MOZART-2 driven by European Centre for Medium-Range Weather Forecasts (ECMWF) fields. Both models simulate ozone in good agreement with the observations but underestimate NO_x. The models indicate that in the troposphere, averaged over the northern middle and high latitudes, chemical production of ozone drives the increase of ozone seen in the spring. Both ozone gross chemical production and loss increase greatly over the spring months. The in situ production is much larger than the net stratospheric input, and the deposition and horizontal fluxes are relatively small in comparison to chemical destruction. The net production depends sensitively on the concentrations of H₂O, HO₂ and NO, which differ slightly in the two models. Both models underestimate the chemical production calculated in a steady state model using TOPSE measurements, but the chemical loss rates agree well. Measures of the stratospheric influence on tropospheric ozone in relation to in situ ozone production are discussed. Two different estimates of the stratospheric fraction of O₃ in the Northern Hemisphere troposphere indicate it decreases from 30–50% in February to 15–30% in June. A sensitivity study of the effect of a perturbation in the vertical flux on tropospheric ozone indicates the contribution from the stratosphere is approximately 15%. Published 26 April 2003. Index Terms: 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 0322 Atmospheric Composition and Structure: Constituent sources and sinks. Read Full Article (file size: 13456660 bytes) Cited by Citation: Emmons, L. K., et al. (2003), Budget of tropospheric ozone during TOPSE from two chemical transport models, J. Geophys. Res., 108(D8), 8372, doi:10.1029/2002JD002665. Copyright 2003 by the American Geophysical Union.

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