Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring
We 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 (HO x ≡H+OH+peroxy radicals) and their reservoirs (HO y ≡HO...
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ftdoajarticles:oai:doaj.org/article:b33d5c1240ae4451bf203debc1fd27b9 2023-05-15T14:47:06+02:00 Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring L. Jaeglé C. McNaughton A. D. Clarke J. H. Crawford G. Chen R. C. Cohen A. J. Weinheimer S. R. Hall J. G. Walega P. Weibring A. Fried J. L. Jimenez M. J. Cubison P. O. Wennberg M. R. Beaver K. M. Spencer J. D. Crounse J. M. St. Clair W. H. Brune X. Ren J. R. Olson M. J. Evans D. J. Jacob J. Mao J. A. Fisher R. M. Yantosca P. Le Sager C. Carouge 2010-07-01T00:00:00Z https://doi.org/10.5194/acp-10-5823-2010 https://doaj.org/article/b33d5c1240ae4451bf203debc1fd27b9 EN eng Copernicus Publications http://www.atmos-chem-phys.net/10/5823/2010/acp-10-5823-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-10-5823-2010 1680-7316 1680-7324 https://doaj.org/article/b33d5c1240ae4451bf203debc1fd27b9 Atmospheric Chemistry and Physics, Vol 10, Iss 13, Pp 5823-5838 (2010) Physics QC1-999 Chemistry QD1-999 article 2010 ftdoajarticles https://doi.org/10.5194/acp-10-5823-2010 2022-12-31T00:41:50Z We 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 (HO x ≡H+OH+peroxy radicals) and their reservoirs (HO y ≡HO x +peroxides) in the springtime Arctic atmosphere. We find that a standard gas-phase chemical mechanism overestimates the observed HO 2 and H 2 O 2 concentrations. Computation of HO x and HO y 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 HO 2 uptake by aerosols, favored by low temperatures and relatively high aerosol loadings, through a mechanism that does not produce H 2 O 2 . We implemented such an uptake of HO 2 by aerosol in the model using a standard reactive uptake coefficient parameterization with γ(HO 2 ) 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 HO x species and HO y reservoirs. HO 2 uptake by aerosol is then a major HO x and HO y sink, decreasing mean OH and HO 2 concentrations in the Arctic troposphere by 32% and 31% respectively. Better rate and product data for HO 2 uptake by aerosol are needed to understand this role of aerosols in limiting the oxidizing power of the Arctic atmosphere. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 10 13 5823 5838 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 L. Jaeglé C. McNaughton A. D. Clarke J. H. Crawford G. Chen R. C. Cohen A. J. Weinheimer S. R. Hall J. G. Walega P. Weibring A. Fried J. L. Jimenez M. J. Cubison P. O. Wennberg M. R. Beaver K. M. Spencer J. D. Crounse J. M. St. Clair W. H. Brune X. Ren J. R. Olson M. J. Evans D. J. Jacob J. Mao J. A. Fisher R. M. Yantosca P. Le Sager C. Carouge Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We 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 (HO x ≡H+OH+peroxy radicals) and their reservoirs (HO y ≡HO x +peroxides) in the springtime Arctic atmosphere. We find that a standard gas-phase chemical mechanism overestimates the observed HO 2 and H 2 O 2 concentrations. Computation of HO x and HO y 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 HO 2 uptake by aerosols, favored by low temperatures and relatively high aerosol loadings, through a mechanism that does not produce H 2 O 2 . We implemented such an uptake of HO 2 by aerosol in the model using a standard reactive uptake coefficient parameterization with γ(HO 2 ) 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 HO x species and HO y reservoirs. HO 2 uptake by aerosol is then a major HO x and HO y sink, decreasing mean OH and HO 2 concentrations in the Arctic troposphere by 32% and 31% respectively. Better rate and product data for HO 2 uptake by aerosol are needed to understand this role of aerosols in limiting the oxidizing power of the Arctic atmosphere. |
format |
Article in Journal/Newspaper |
author |
L. Jaeglé C. McNaughton A. D. Clarke J. H. Crawford G. Chen R. C. Cohen A. J. Weinheimer S. R. Hall J. G. Walega P. Weibring A. Fried J. L. Jimenez M. J. Cubison P. O. Wennberg M. R. Beaver K. M. Spencer J. D. Crounse J. M. St. Clair W. H. Brune X. Ren J. R. Olson M. J. Evans D. J. Jacob J. Mao J. A. Fisher R. M. Yantosca P. Le Sager C. Carouge |
author_facet |
L. Jaeglé C. McNaughton A. D. Clarke J. H. Crawford G. Chen R. C. Cohen A. J. Weinheimer S. R. Hall J. G. Walega P. Weibring A. Fried J. L. Jimenez M. J. Cubison P. O. Wennberg M. R. Beaver K. M. Spencer J. D. Crounse J. M. St. Clair W. H. Brune X. Ren J. R. Olson M. J. Evans D. J. Jacob J. Mao J. A. Fisher R. M. Yantosca P. Le Sager C. Carouge |
author_sort |
L. Jaeglé |
title |
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
title_short |
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
title_full |
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
title_fullStr |
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
title_full_unstemmed |
Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring |
title_sort |
chemistry of hydrogen oxide radicals (ho x ) in the arctic troposphere in spring |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/acp-10-5823-2010 https://doaj.org/article/b33d5c1240ae4451bf203debc1fd27b9 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 10, Iss 13, Pp 5823-5838 (2010) |
op_relation |
http://www.atmos-chem-phys.net/10/5823/2010/acp-10-5823-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-10-5823-2010 1680-7316 1680-7324 https://doaj.org/article/b33d5c1240ae4451bf203debc1fd27b9 |
op_doi |
https://doi.org/10.5194/acp-10-5823-2010 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
10 |
container_issue |
13 |
container_start_page |
5823 |
op_container_end_page |
5838 |
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1766318242013380608 |