Modeling the inorganic bromine partitioning in the tropical tropopause layer over the eastern and western Pacific Ocean

Maria A. Navarro, Alfonso Saiz-Lopez, Carlos A. Cuevas, Rafael P. Fernandez, Elliot L Atlas, Xavier Rodriguez-Lloveras, Douglas Kinnison, Jean Francois Lamarque, Simone Tilmes, Troy Thornberry, Andrew Rollins, James W. Elkins, Eric J. Hintsa, Fred L. Moore

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The stratospheric inorganic bromine (Bry) burden 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 modeled inorganic bromine abundances over the Pacific tropical tropopause based on aircraft observations of VSLorg from two campaigns of the Airborne Tropical TRopopause EXperiment (ATTREX 2013, carried out over the 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 nighttime 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), total inorganic chlorine (Cly), and the efficiency of heterogeneous reactions of bromine reservoirs (mostly BrONO2 and HBr) occurring on ice crystals.

Original languageEnglish (US)
Pages (from-to)9917-9930
Number of pages14
JournalAtmospheric Chemistry and Physics
Volume17
Issue number16
DOIs
StatePublished - Aug 23 2017

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bromine
tropopause
partitioning
ocean
modeling
flight
ozone
ice crystal
nitrogen dioxide
zenith angle
trace gas
meteorology
chlorine
aircraft
degradation
atmosphere
climate
simulation
experiment
temperature

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Modeling the inorganic bromine partitioning in the tropical tropopause layer over the eastern and western Pacific Ocean. / Navarro, Maria A.; Saiz-Lopez, Alfonso; Cuevas, Carlos A.; Fernandez, Rafael P.; Atlas, Elliot L; Rodriguez-Lloveras, Xavier; Kinnison, Douglas; Lamarque, Jean Francois; Tilmes, Simone; Thornberry, Troy; Rollins, Andrew; Elkins, James W.; Hintsa, Eric J.; Moore, Fred L.

In: Atmospheric Chemistry and Physics, Vol. 17, No. 16, 23.08.2017, p. 9917-9930.

Research output: Contribution to journalArticle

Navarro, MA, Saiz-Lopez, A, Cuevas, CA, Fernandez, RP, Atlas, EL, Rodriguez-Lloveras, X, Kinnison, D, Lamarque, JF, Tilmes, S, Thornberry, T, Rollins, A, Elkins, JW, Hintsa, EJ & Moore, FL 2017, 'Modeling the inorganic bromine partitioning in the tropical tropopause layer over the eastern and western Pacific Ocean', Atmospheric Chemistry and Physics, vol. 17, no. 16, pp. 9917-9930. https://doi.org/10.5194/acp-17-9917-2017
Navarro, Maria A. ; Saiz-Lopez, Alfonso ; Cuevas, Carlos A. ; Fernandez, Rafael P. ; Atlas, Elliot L ; Rodriguez-Lloveras, Xavier ; Kinnison, Douglas ; Lamarque, Jean Francois ; Tilmes, Simone ; Thornberry, Troy ; Rollins, Andrew ; Elkins, James W. ; Hintsa, Eric J. ; Moore, Fred L. / Modeling the inorganic bromine partitioning in the tropical tropopause layer over the eastern and western Pacific Ocean. In: Atmospheric Chemistry and Physics. 2017 ; Vol. 17, No. 16. pp. 9917-9930.
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AU - Navarro, Maria A.

AU - Saiz-Lopez, Alfonso

AU - Cuevas, Carlos A.

AU - Fernandez, Rafael P.

AU - Atlas, Elliot L

AU - Rodriguez-Lloveras, Xavier

AU - Kinnison, Douglas

AU - Lamarque, Jean Francois

AU - Tilmes, Simone

AU - Thornberry, Troy

AU - Rollins, Andrew

AU - Elkins, James W.

AU - Hintsa, Eric J.

AU - Moore, Fred L.

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AB - The stratospheric inorganic bromine (Bry) burden 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 modeled inorganic bromine abundances over the Pacific tropical tropopause based on aircraft observations of VSLorg from two campaigns of the Airborne Tropical TRopopause EXperiment (ATTREX 2013, carried out over the 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 nighttime 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), total inorganic chlorine (Cly), and the efficiency of heterogeneous reactions of bromine reservoirs (mostly BrONO2 and HBr) occurring on ice crystals.

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