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Atmospheric Composition

Chemistry involving bromine affects ozone and related species from the marine boundary layer to the lower stratosphere. Satellite observations reveal much higher levels of BrO than found in most models of atmospheric composition, which generally assume supply from the long-lived sources methyl bromide (CH3Br) and halons. A complete description of the sources, partitioning, distributions, and impacts of bromine throughout the troposphere and lower stratosphere has yet to be achieved, in part due to the spatial and temporal variability of very short-lived (VSL) organic bromine sources and the complexity of aerosol uptake (bromine sink) versus heterogeneous reactivity (releases soluble bromine back to the gas phase) in the critical upper troposphere region. The global significance of atmospheric bromine supplied to the troposphere by sea-salt and the spring time high latitude “bromine explosion” is quite uncertain. We propose to use existing models to analyze observations of BrO obtained by satellite and aircraft instruments supported by NASA as well as ground-based measurements of BrO and various other measurements of BrO supported by other agencies, to: a) define the influence of various sources of atmospheric bromine on tropospheric and stratospheric abundances of BrO b) assess the implications for atmospheric ozone and related species of bromine supplied by sources other than CH3Br and halons The focal point of our proposed work is analysis of column BrO measurements obtained by the OMI satellite instrument. We will develop three dimensional model fields of stratospheric column BrO, based on 3D model calculations of long-lived tracers, which will allow the burden of tropospheric BrO to be estimated from the satellite measurements of total column. The model estimates of both stratospheric and tropospheric BrO will be evaluated based on comparisons with a variety of sub-orbital measurements. Impacts of the bromine chemistry on ozone, associated catalytic loss cycles, and the chemistry that regulates radicals such as NOx and HOx in the lower stratosphere and upper troposphere will be quantified using existing model tools, the value for Bry supplied by VSL organics inferred from this study, as well as future measurements of radical species we anticipate will become available during the period of support.

Project PI:Ross Salawitch/University of Maryland, College Park

2403 Computer & Space Sciences Building

Phone: (301)405-5396

Email: rjs@atmos.umd.edu

http://www.atmos.umd.edu/~rjs

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Started: Sep 03, 2010

Last Activity: Feb 02, 2011

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