Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1031
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
05 Dec 2016
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Modelling the Inorganic Bromine Partitioning in the Tropical Tropopause over the Pacific Ocean
Maria A. Navarro1, Alfonso Saiz-Lopez2, Carlos A. Cuevas2, Rafael P. Fernandez3, Elliot Atlas1, Xavier Rodriguez-Lloveras2, Douglas Kinnison4, Jean-Francois Lamarque4, Simone Tilmes4, Troy Thornberry5,6, Andrew Rollins5,6, James W. Elkins5, Eric J. Hintsa5,6, and Fred L. Moore5,6 1Department of Atmospheric Sciences , RSMAS, University of Miami, Miami, Florida, USA
2Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
3National Research Council (CONICET), FCEN -UNCuyo, UTN- FRM, Mendoza, Argentina
4Atmospheric Chemistry Observation & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado, USA
5National Oceanic & Atmospheric Administration, Earth System Research Laboratory, Boulder, Colorado, USA
6Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, Colorado, USA
Abstract. The stratospheric inorganic bromine burden (Bry) arising from the degradation of brominated very short-lived organic substances (VSLorg), and its partitioning between reactive and reservoir species, is needed for a comprehensive assessment of the ozone depletion potential of brominated trace gases. Here we present modelled inorganic bromine abundances over the Pacific tropical tropopause based on aircraft observations of VSLorg of two campaigns of the Airborne Tropical TRopopause EXperiment (ATTREX 2013 carried out over eastern Pacific and ATTREX 2014 carried out over the western Pacific) and chemistry-climate simulations (along ATTREX flight tracks) using the specific meteorology prevailing. Using the Community Atmosphere Model with Chemistry (CAM-Chem), we model that BrO and Br are the daytime dominant species. Integrated across all ATTREX flights BrO represents ~ 43 % and 48 % of daytime Bry abundance at 17 km over the Western and Eastern Pacific, respectively. The results also show zones where Br/BrO > 1 depending on the solar zenith angle (SZA), ozone concentration and temperature. On the other hand, BrCl and BrONO2 were found to be the dominant night-time species with ~ 61 % and 56 % of abundance at 17 km over the Western and Eastern Pacific, respectively. The western-to-eastern differences in the partitioning of inorganic bromine are explained by different abundances of ozone (O3), nitrogen dioxide (NO2), and total inorganic chlorine (Cly).

Citation: Navarro, M. A., Saiz-Lopez, A., Cuevas, C. A., Fernandez, R. P., Atlas, E., Rodriguez-Lloveras, X., Kinnison, D., Lamarque, J.-F., Tilmes, S., Thornberry, T., Rollins, A., Elkins, J. W., Hintsa, E. J., and Moore, F. L.: Modelling the Inorganic Bromine Partitioning in the Tropical Tropopause over the Pacific Ocean, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1031, in review, 2016.
Maria A. Navarro et al.
Maria A. Navarro et al.
Maria A. Navarro et al.

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Short summary
Inorganic bromine (Bry) plays an important role in the ozone layer depletion. Based on aircraft observations of organic bromine species and chemistry simulations, we model the Bry abundances over the Pacific tropical tropopause. Our results show BrO and Br as the dominant species during daytime hours, and BrCl and BrONO2 as the night-time dominant species over the western and eastern Pacific, respectively. The difference in the partitioning are due to changes in the abundance of O3, NO2 and Cly.
Inorganic bromine (Bry) plays an important role in the ozone layer depletion. Based on aircraft...
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