Chemistry of hydrogen oxide radicals (HOₓ) in the Arctic troposphere in spring

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dc.contributor.authorMao, J.
dc.contributor.authorJacob, D. J.
dc.contributor.authorEvans, M. J.
dc.contributor.authorOlson, J. R.
dc.contributor.authorRen, X.
dc.contributor.authorBrune, W. H.
dc.contributor.authorSt. Clair, Jason
dc.contributor.authorCrounse, J. D.
dc.contributor.authorSpencer, K. M.
dc.contributor.authorBeaver, M. R.
dc.contributor.authorWennberg, P. O.
dc.contributor.authorCubison, M. J.
dc.contributor.authorJimenez, J. L.
dc.contributor.authorFried, A.
dc.contributor.authorWeibring, P.
dc.contributor.authorWalega, J. G.
dc.contributor.authorHall, S. R.
dc.contributor.authorWeinheimer, A. J.
dc.contributor.authorCohen, R. C.
dc.contributor.authorChen, G.
dc.contributor.authorCrawford, J. H.
dc.contributor.authorMcNaughton, C.
dc.contributor.authorClarke, A. D.
dc.contributor.authorJaeglé, L.
dc.contributor.authorFisher, J. A.
dc.contributor.authorYantosca, R. M.
dc.contributor.authorSager, P. Le
dc.contributor.authorCarouge, C.
dc.date.accessioned2020-06-18T17:44:41Z
dc.date.available2020-06-18T17:44:41Z
dc.date.issued2010-07-01
dc.description.abstractWe use observations from the April 2008 NASA ARCTAS aircraft campaign to the North American Arctic, interpreted with a global 3-D chemical transport model (GEOS-Chem), to better understand the sources and cycling of hydrogen oxide radicals (HOₓ≡H+OH+peroxy radicals) and their reservoirs (HOy≡HOₓ+peroxides) in the springtime Arctic atmosphere. We find that a standard gas-phase chemical mechanism overestimates the observed HO₂ and H₂O₂ concentrations. Computation of HOₓ and HOy gas-phase chemical budgets on the basis of the aircraft observations also indicates a large missing sink for both. We hypothesize that this could reflect HO₂ uptake by aerosols, favored by low temperatures and relatively high aerosol loadings, through a mechanism that does not produce H₂O₂. We implemented such an uptake of HO₂ by aerosol in the model using a standard reactive uptake coefficient parameterization with γ(HO₂) values ranging from 0.02 at 275 K to 0.5 at 220 K. This successfully reproduces the concentrations and vertical distributions of the different HOₓ species and HOy reservoirs. HO₂ uptake by aerosol is then a major HOₓ and HOy sink, decreasing mean OH and HO₂ concentrations in the Arctic troposphere by 32% and 31% respectively. Better rate and product data for HO₂ uptake by aerosol are needed to understand this role of aerosols in limiting the oxidizing power of the Arctic atmosphere.en_US
dc.description.sponsorshipThe authors would like to thank Scot T. Martin, Hongyu Liu, Charles E. Miller, Richard A. Ferrare, Karl D. Froyd and Daniel M. Murphy for helpful discussions. We also would like to thank Yuhang Wang for providing the TOPSE dataset, Huisheng Bian for providing Fast-JX updates and Dirk Richter for contributing to the HCHO measurement. J. Mao also thanks David M. Shelow and the NASA DC-8 crew for their generous help with making HOx measurements on the aircraft. This work was supported by the NASA Tropospheric Chemistry Program.en_US
dc.description.urihttps://www.atmos-chem-phys.net/10/5823/2010/en_US
dc.format.extent16 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2t4ej-m22r
dc.identifier.citationMao, J., Jacob, D. J., Evans, M. J., Olson, J. R., Ren, X., Brune, W. H., Clair, J. M. St., Crounse, J. D., Spencer, K. M., Beaver, M. R., Wennberg, P. O., Cubison, M. J., Jimenez, J. L., Fried, A., Weibring, P., Walega, J. G., Hall, S. R., Weinheimer, A. J., Cohen, R. C., Chen, G., Crawford, J. H., McNaughton, C., Clarke, A. D., Jaeglé, L., Fisher, J. A., Yantosca, R. M., Le Sager, P., and Carouge, C.: Chemistry of hydrogen oxide radicals (HOx) in the Arctic troposphere in spring, Atmos. Chem. Phys., 10, 5823–5838, https://doi.org/10.5194/acp-10-5823-2010, 2010.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-10-5823-2010
dc.identifier.urihttp://hdl.handle.net/11603/18928
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 3.0 Unported*
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/*
dc.titleChemistry of hydrogen oxide radicals (HOₓ) in the Arctic troposphere in springen_US
dc.typeTexten_US

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