Staff View: Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo

Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo

This paper presents a modelling study on the fate of CHBr3 and its product gases in the troposphere within the context of tropical deep convection. A cloud-scale case study was conducted along the west coast of Borneo, where several deep convective systems were triggered on the afternoon and early e...

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Main Authors:	Hamer, Paul D., Marecal, Virginie, Hossaini, Ryan, Pirre, Michel, Krysztofiak, Gisele, Ziska, Franziska, Engel, Andreas, Sala, Stephan, Keber, Timo, Boenisch, Harald, Atlas, Elliot, Krueger, Kirstin, Chipperfield, Martyn, Catoire, Valery, Samah, Azizan Abu., Dorf, Marcel, Siew Moi, Phang, Schlager, Hans, Pfeilsticker, Klaus
Format:	Article
Published:	Copernicus Gesellschaft MBH 2021
Subjects:	GC Oceanography Q Science (General)
Online Access:	http://eprints.um.edu.my/34607/
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spelling	my.um.eprints.346072022-06-13T02:25:29Z http://eprints.um.edu.my/34607/ Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo Hamer, Paul D. Marecal, Virginie Hossaini, Ryan Pirre, Michel Krysztofiak, Gisele Ziska, Franziska Engel, Andreas Sala, Stephan Keber, Timo Boenisch, Harald Atlas, Elliot Krueger, Kirstin Chipperfield, Martyn Catoire, Valery Samah, Azizan Abu. Dorf, Marcel Siew Moi, Phang Schlager, Hans Pfeilsticker, Klaus GC Oceanography Q Science (General) This paper presents a modelling study on the fate of CHBr3 and its product gases in the troposphere within the context of tropical deep convection. A cloud-scale case study was conducted along the west coast of Borneo, where several deep convective systems were triggered on the afternoon and early evening of 19 November 2011. These systems were sampled by the Falcon aircraft during the field campaign of the SHIVA project and analysed using a simulation with the cloud-resolving meteorological model C-CATT-BRAMS at 2x2 km resolution that represents the emissions, transport by large-scale flow, convection, photochemistry, and washout of CHBr3 and its product gases (PGs). We find that simulated CHBr3 mixing ratios and the observed values in the boundary layer and the outflow of the convective systems agree. However, the model underestimates the background CHBr3 mixing ratios in the upper troposphere, which suggests a missing source at the regional scale. An analysis of the simulated chemical speciation of bromine within and around each simulated convective system during the mature convective stage reveals that > 85% of the bromine derived from CHBr3 and its PGs is transported vertically to the point of convective detrainment in the form of CHBr3 and that the remaining small fraction is in the form of organic PGs, principally insoluble brominated carbonyls produced from the photo-oxidation of CHBr3. The model simulates that within the boundary layer and free troposphere, the inorganic PGs are only present in soluble forms, i.e. HBr, HOBr, and BrONO2, and, consequently, within the convective clouds, the inorganic PGs are almost entirely removed by wet scavenging. We find that HBr is the most abundant PG in background lower-tropospheric air and that this prevalence of HBr is a result of the relatively low background tropospheric ozone levels at the regional scale. Contrary to a previous study in a different environment, for the conditions in the simulation, the insoluble Br-2 species is hardly formed within the convective systems and therefore plays no significant role in the vertical transport of bromine. This likely results from the relatively small quantities of simulated inorganic bromine involved, the presence of HBr in large excess compared to HOBr and BrO, and the relatively efficient removal of soluble compounds within the convective column. Copernicus Gesellschaft MBH 2021-11-23 Article PeerReviewed Hamer, Paul D. and Marecal, Virginie and Hossaini, Ryan and Pirre, Michel and Krysztofiak, Gisele and Ziska, Franziska and Engel, Andreas and Sala, Stephan and Keber, Timo and Boenisch, Harald and Atlas, Elliot and Krueger, Kirstin and Chipperfield, Martyn and Catoire, Valery and Samah, Azizan Abu. and Dorf, Marcel and Siew Moi, Phang and Schlager, Hans and Pfeilsticker, Klaus (2021) Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo. Atmospheric Chemistry and Physics, 21 (22). pp. 16955-16984. ISSN 1680-7316, DOI https://doi.org/10.5194/acp-21-16955-2021 <https://doi.org/10.5194/acp-21-16955-2021>. 10.5194/acp-21-16955-2021
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	GC Oceanography Q Science (General)
spellingShingle	GC Oceanography Q Science (General) Hamer, Paul D. Marecal, Virginie Hossaini, Ryan Pirre, Michel Krysztofiak, Gisele Ziska, Franziska Engel, Andreas Sala, Stephan Keber, Timo Boenisch, Harald Atlas, Elliot Krueger, Kirstin Chipperfield, Martyn Catoire, Valery Samah, Azizan Abu. Dorf, Marcel Siew Moi, Phang Schlager, Hans Pfeilsticker, Klaus Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
description	This paper presents a modelling study on the fate of CHBr3 and its product gases in the troposphere within the context of tropical deep convection. A cloud-scale case study was conducted along the west coast of Borneo, where several deep convective systems were triggered on the afternoon and early evening of 19 November 2011. These systems were sampled by the Falcon aircraft during the field campaign of the SHIVA project and analysed using a simulation with the cloud-resolving meteorological model C-CATT-BRAMS at 2x2 km resolution that represents the emissions, transport by large-scale flow, convection, photochemistry, and washout of CHBr3 and its product gases (PGs). We find that simulated CHBr3 mixing ratios and the observed values in the boundary layer and the outflow of the convective systems agree. However, the model underestimates the background CHBr3 mixing ratios in the upper troposphere, which suggests a missing source at the regional scale. An analysis of the simulated chemical speciation of bromine within and around each simulated convective system during the mature convective stage reveals that > 85% of the bromine derived from CHBr3 and its PGs is transported vertically to the point of convective detrainment in the form of CHBr3 and that the remaining small fraction is in the form of organic PGs, principally insoluble brominated carbonyls produced from the photo-oxidation of CHBr3. The model simulates that within the boundary layer and free troposphere, the inorganic PGs are only present in soluble forms, i.e. HBr, HOBr, and BrONO2, and, consequently, within the convective clouds, the inorganic PGs are almost entirely removed by wet scavenging. We find that HBr is the most abundant PG in background lower-tropospheric air and that this prevalence of HBr is a result of the relatively low background tropospheric ozone levels at the regional scale. Contrary to a previous study in a different environment, for the conditions in the simulation, the insoluble Br-2 species is hardly formed within the convective systems and therefore plays no significant role in the vertical transport of bromine. This likely results from the relatively small quantities of simulated inorganic bromine involved, the presence of HBr in large excess compared to HOBr and BrO, and the relatively efficient removal of soluble compounds within the convective column.
format	Article
author	Hamer, Paul D. Marecal, Virginie Hossaini, Ryan Pirre, Michel Krysztofiak, Gisele Ziska, Franziska Engel, Andreas Sala, Stephan Keber, Timo Boenisch, Harald Atlas, Elliot Krueger, Kirstin Chipperfield, Martyn Catoire, Valery Samah, Azizan Abu. Dorf, Marcel Siew Moi, Phang Schlager, Hans Pfeilsticker, Klaus
author_facet	Hamer, Paul D. Marecal, Virginie Hossaini, Ryan Pirre, Michel Krysztofiak, Gisele Ziska, Franziska Engel, Andreas Sala, Stephan Keber, Timo Boenisch, Harald Atlas, Elliot Krueger, Kirstin Chipperfield, Martyn Catoire, Valery Samah, Azizan Abu. Dorf, Marcel Siew Moi, Phang Schlager, Hans Pfeilsticker, Klaus
author_sort	Hamer, Paul D.
title	Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
title_short	Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
title_full	Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
title_fullStr	Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
title_full_unstemmed	Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo
title_sort	cloud-scale modelling of the impact of deep convection on the fate of oceanic bromoform in the troposphere: a case study over the west coast of borneo
publisher	Copernicus Gesellschaft MBH
publishDate	2021
url	http://eprints.um.edu.my/34607/
_version_	1735570307524067328
score	13.211869

Cloud-scale modelling of the impact of deep convection on the fate of Oceanic bromoform in the troposphere: A case study over the West Coast of Borneo

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