Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 13, Pages 7069-7078Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073812
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Funding
- NSF AGS award [1343077]
- NASA [NNX15AE32G]
- Calsberg Foundation [CF19-0519]
- NERC [ncas10008, ncas10005] Funding Source: UKRI
- Natural Environment Research Council [1232617, ncas10005, ncas10009, ncas10008] Funding Source: researchfish
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1343077] Funding Source: National Science Foundation
- NASA [809569, NNX15AE32G] Funding Source: Federal RePORTER
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Sulfur and reactive bromine (Br-y) play important roles in tropospheric chemistry and the global radiation budget. The oxidation of dissolved SO2 (S(IV)) by HOBr increases sulfate aerosol abundance and may also impact the Br-y budget, but is generally not included in global climate and chemistry models. In this study, we implement HOBr + S(IV) reactions into the GEOS-Chem global chemical transport model and evaluate the global impacts on both sulfur and Br-y budgets. Modeled HOBr mixing ratios on the order of 0.1-1.0 parts per trillion (ppt) lead to HOBr + S(IV) contributing to 8% of global sulfate production and up to 45% over some tropical ocean regions with high HOBr mixing ratios (0.6-0.9 ppt). Inclusion of HOBr + S(IV) in the model leads to a global Br-y decrease of 50%, initiated by the decrease in bromide recycling in cloud droplets. Observations of HOBr are necessary to better understand the role of HOBr + S(IV) in tropospheric sulfur and Br-y cycles.
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