The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model

Abstract We document the implementation of the Common Representative Intermediates Mechanism version 2, reduction 5 into the United Kingdom Chemistry and Aerosol model (UKCA) version 10.9. The mechanism is merged with the stratospheric chemistry already used by the StratTrop mechanism, as used in UK...

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Autores principales:	S. Archer‐Nicholls, N. L. Abraham, Y. M. Shin, J. Weber, M. R. Russo, D. Lowe, S. R. Utembe, F. M. O'Connor, B. Kerridge, B. Latter, R. Siddans, M. Jenkin, O. Wild, A. T. Archibald
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	Atmospheric chemistry CRI ozone UKCA UKESM1 Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/06eacaf8d7eb4835af09a23b7765a824
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spelling	oai:doaj.org-article:06eacaf8d7eb4835af09a23b7765a8242021-11-24T08:11:41ZThe Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model1942-246610.1029/2020MS002420https://doaj.org/article/06eacaf8d7eb4835af09a23b7765a8242021-05-01T00:00:00Zhttps://doi.org/10.1029/2020MS002420https://doaj.org/toc/1942-2466Abstract We document the implementation of the Common Representative Intermediates Mechanism version 2, reduction 5 into the United Kingdom Chemistry and Aerosol model (UKCA) version 10.9. The mechanism is merged with the stratospheric chemistry already used by the StratTrop mechanism, as used in UKCA and the UK Earth System Model, to create a new CRI‐Strat mechanism. CRI‐Strat simulates a more comprehensive treatment of non‐methane volatile organic compounds (NMVOCs) and provides traceability with the Master Chemical Mechanism. In total, CRI‐Strat simulates the chemistry of 233 species competing in 613 reactions (compared to 87 species and 305 reactions in the existing StratTrop mechanism). However, while more than twice as complex than StratTrop, the new mechanism is only 75% more computationally expensive. CRI‐Strat is evaluated against an array of in situ and remote sensing observations and simulations using the StratTrop mechanism in the UKCA model. It is found to increase production of ozone near the surface, leading to higher ozone concentrations compared to surface observations. However, ozone loss is also greater in CRI‐Strat, leading to less ozone away from emission sources and a similar tropospheric ozone burden compared to StratTrop. CRI‐Strat also produces more carbon monoxide than StratTrop, particularly downwind of biogenic VOC emission sources, but has lower burdens of nitrogen oxides as more is converted into reservoir species. The changes to tropospheric ozone and nitrogen budgets are sensitive to the treatment of NMVOC emissions, highlighting the need to reduce uncertainty in these emissions to improve representation of tropospheric chemical composition.S. Archer‐NichollsN. L. AbrahamY. M. ShinJ. WeberM. R. RussoD. LoweS. R. UtembeF. M. O'ConnorB. KerridgeB. LatterR. SiddansM. JenkinO. WildA. T. ArchibaldAmerican Geophysical Union (AGU)articleAtmospheric chemistryCRIozoneUKCAUKESM1Physical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 5, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Atmospheric chemistry CRI ozone UKCA UKESM1 Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	Atmospheric chemistry CRI ozone UKCA UKESM1 Physical geography GB3-5030 Oceanography GC1-1581 S. Archer‐Nicholls N. L. Abraham Y. M. Shin J. Weber M. R. Russo D. Lowe S. R. Utembe F. M. O'Connor B. Kerridge B. Latter R. Siddans M. Jenkin O. Wild A. T. Archibald The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
description	Abstract We document the implementation of the Common Representative Intermediates Mechanism version 2, reduction 5 into the United Kingdom Chemistry and Aerosol model (UKCA) version 10.9. The mechanism is merged with the stratospheric chemistry already used by the StratTrop mechanism, as used in UKCA and the UK Earth System Model, to create a new CRI‐Strat mechanism. CRI‐Strat simulates a more comprehensive treatment of non‐methane volatile organic compounds (NMVOCs) and provides traceability with the Master Chemical Mechanism. In total, CRI‐Strat simulates the chemistry of 233 species competing in 613 reactions (compared to 87 species and 305 reactions in the existing StratTrop mechanism). However, while more than twice as complex than StratTrop, the new mechanism is only 75% more computationally expensive. CRI‐Strat is evaluated against an array of in situ and remote sensing observations and simulations using the StratTrop mechanism in the UKCA model. It is found to increase production of ozone near the surface, leading to higher ozone concentrations compared to surface observations. However, ozone loss is also greater in CRI‐Strat, leading to less ozone away from emission sources and a similar tropospheric ozone burden compared to StratTrop. CRI‐Strat also produces more carbon monoxide than StratTrop, particularly downwind of biogenic VOC emission sources, but has lower burdens of nitrogen oxides as more is converted into reservoir species. The changes to tropospheric ozone and nitrogen budgets are sensitive to the treatment of NMVOC emissions, highlighting the need to reduce uncertainty in these emissions to improve representation of tropospheric chemical composition.
format	article
author	S. Archer‐Nicholls N. L. Abraham Y. M. Shin J. Weber M. R. Russo D. Lowe S. R. Utembe F. M. O'Connor B. Kerridge B. Latter R. Siddans M. Jenkin O. Wild A. T. Archibald
author_facet	S. Archer‐Nicholls N. L. Abraham Y. M. Shin J. Weber M. R. Russo D. Lowe S. R. Utembe F. M. O'Connor B. Kerridge B. Latter R. Siddans M. Jenkin O. Wild A. T. Archibald
author_sort	S. Archer‐Nicholls
title	The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
title_short	The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
title_full	The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
title_fullStr	The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
title_full_unstemmed	The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model
title_sort	common representative intermediates mechanism version 2 in the united kingdom chemistry and aerosols model
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/06eacaf8d7eb4835af09a23b7765a824
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The Common Representative Intermediates Mechanism Version 2 in the United Kingdom Chemistry and Aerosols Model

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