Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula
The marine environment is known to be a source of CHBr3 and CH2Br2 and hence ozone-depleting inorganic bromine to the troposphere but, to date, the dominant processes controlling their concentrations in seawater remain poorly understood. Here results are reported from a series of laboratory experime...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/502042/ http://www.sciencedirect.com/science/article/pii/S0304420313000200 https://doi.org/10.1016/j.marchem.2013.01.007 |
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ftnerc:oai:nora.nerc.ac.uk:502042 2024-02-11T09:58:43+01:00 Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula Hughes, C. Johnson, M. Utting, R. Turner, S. Malin, G. Clarke, A. Liss, P.S. 2013-04-20 http://nora.nerc.ac.uk/id/eprint/502042/ http://www.sciencedirect.com/science/article/pii/S0304420313000200 https://doi.org/10.1016/j.marchem.2013.01.007 unknown Elsevier Hughes, C.; Johnson, M.; Utting, R.; Turner, S.; Malin, G.; Clarke, A. orcid:0000-0002-7582-3074 Liss, P.S. 2013 Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula. Marine Chemistry, 151. 35-46. https://doi.org/10.1016/j.marchem.2013.01.007 <https://doi.org/10.1016/j.marchem.2013.01.007> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1016/j.marchem.2013.01.007 2024-01-19T00:03:13Z The marine environment is known to be a source of CHBr3 and CH2Br2 and hence ozone-depleting inorganic bromine to the troposphere but, to date, the dominant processes controlling their concentrations in seawater remain poorly understood. Here results are reported from a series of laboratory experiments designed to investigate bromocarbon dynamics in cultures of marine diatoms and bacteria isolated recently from the Rothera Time-Series (RaTS) site located in coastal waters of the western Antarctic Peninsula. The main focus of this work was an isolate of the centric diatom Thalassiosira sp. Different processes were found to control the concentrations of CHBr3 and CH2Br2 in this culture. The production of CHBr3 was restricted to the exponential phase of growth suggesting a link with a primary metabolic process and was a factor of 5–6 higher in cultures treated with antibiotics to reduce bacterial activity. 13CHBr3 additions confirmed that CHBr3 was not subject to significant bacterial breakdown and hence bacteria are likely to be inhibiting the production of this compound. The rate of 13CH2Br2 appearance in the cultures observed following 13CHBr3 addition suggests that the major source of CH2Br2 in the diatom culture was transformation from CHBr3. CD2Br2 additions revealed that CH2Br2 was subject to significant breakdown in cultures of both Thalassiosira sp. and a bacterial isolate with apparent loss rate constants ranging from 0.21 to 0.78 day− 1. These findings are used to produce an empirical scheme describing bromocarbon cycling in natural waters which is validated against measured concentration data from the RaTS site. The detailed process information and schemes presented provide a major step forward towards the development of biogeochemical modules that could be coupled to ecosystem models. These could then be used to predict how sea-to-air biogenic bromine emissions will change under future scenarios. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Marine Chemistry 151 35 46 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
The marine environment is known to be a source of CHBr3 and CH2Br2 and hence ozone-depleting inorganic bromine to the troposphere but, to date, the dominant processes controlling their concentrations in seawater remain poorly understood. Here results are reported from a series of laboratory experiments designed to investigate bromocarbon dynamics in cultures of marine diatoms and bacteria isolated recently from the Rothera Time-Series (RaTS) site located in coastal waters of the western Antarctic Peninsula. The main focus of this work was an isolate of the centric diatom Thalassiosira sp. Different processes were found to control the concentrations of CHBr3 and CH2Br2 in this culture. The production of CHBr3 was restricted to the exponential phase of growth suggesting a link with a primary metabolic process and was a factor of 5–6 higher in cultures treated with antibiotics to reduce bacterial activity. 13CHBr3 additions confirmed that CHBr3 was not subject to significant bacterial breakdown and hence bacteria are likely to be inhibiting the production of this compound. The rate of 13CH2Br2 appearance in the cultures observed following 13CHBr3 addition suggests that the major source of CH2Br2 in the diatom culture was transformation from CHBr3. CD2Br2 additions revealed that CH2Br2 was subject to significant breakdown in cultures of both Thalassiosira sp. and a bacterial isolate with apparent loss rate constants ranging from 0.21 to 0.78 day− 1. These findings are used to produce an empirical scheme describing bromocarbon cycling in natural waters which is validated against measured concentration data from the RaTS site. The detailed process information and schemes presented provide a major step forward towards the development of biogeochemical modules that could be coupled to ecosystem models. These could then be used to predict how sea-to-air biogenic bromine emissions will change under future scenarios. |
format |
Article in Journal/Newspaper |
author |
Hughes, C. Johnson, M. Utting, R. Turner, S. Malin, G. Clarke, A. Liss, P.S. |
spellingShingle |
Hughes, C. Johnson, M. Utting, R. Turner, S. Malin, G. Clarke, A. Liss, P.S. Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
author_facet |
Hughes, C. Johnson, M. Utting, R. Turner, S. Malin, G. Clarke, A. Liss, P.S. |
author_sort |
Hughes, C. |
title |
Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
title_short |
Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
title_full |
Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
title_fullStr |
Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
title_full_unstemmed |
Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula |
title_sort |
microbial control of bromocarbon concentrations in coastal waters of the western antarctic peninsula |
publisher |
Elsevier |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502042/ http://www.sciencedirect.com/science/article/pii/S0304420313000200 https://doi.org/10.1016/j.marchem.2013.01.007 |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) |
geographic |
Antarctic Antarctic Peninsula Rothera |
geographic_facet |
Antarctic Antarctic Peninsula Rothera |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
Hughes, C.; Johnson, M.; Utting, R.; Turner, S.; Malin, G.; Clarke, A. orcid:0000-0002-7582-3074 Liss, P.S. 2013 Microbial control of bromocarbon concentrations in coastal waters of the western Antarctic Peninsula. Marine Chemistry, 151. 35-46. https://doi.org/10.1016/j.marchem.2013.01.007 <https://doi.org/10.1016/j.marchem.2013.01.007> |
op_doi |
https://doi.org/10.1016/j.marchem.2013.01.007 |
container_title |
Marine Chemistry |
container_volume |
151 |
container_start_page |
35 |
op_container_end_page |
46 |
_version_ |
1790594466163195904 |