Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community
The Baltic Sea is a unique environment as the largest body of brackish water in the world. Acidification of the surface oceans due to absorption of anthropogenic CO2 emissions is an additional stressor facing the pelagic community of the already challenging Baltic Sea. To investigate its impact on t...
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ftplymouthml:oai:plymsea.ac.uk:6801 2023-05-15T17:52:08+02:00 Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community Webb, A Leedham-Elvidge, E Hughes, C Hopkins, FE Malin, G Bach, L Schulz, K Crawfurd, KJ 2016-01-28 text http://plymsea.ac.uk/id/eprint/6801/ http://plymsea.ac.uk/id/eprint/6801/1/Webb%20et%20al%202016%20Discussion%20paper.pdf https://doi.org/10.5194/bg-2015-573 en eng http://plymsea.ac.uk/id/eprint/6801/1/Webb%20et%20al%202016%20Discussion%20paper.pdf Webb, A; Leedham-Elvidge, E; Hughes, C; Hopkins, FE; Malin, G; Bach, L; Schulz, K; Crawfurd, KJ. 2016 Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community [in special issue: Effects of rising CO2 on a Baltic Sea plankton community: ecological and biogeochemical impacts] Biogeosciences Discussions. https://doi.org/10.5194/bg-2015-573 <https://doi.org/10.5194/bg-2015-573> cc_by CC-BY Chemistry Marine Sciences Publication - Article NonPeerReviewed 2016 ftplymouthml https://doi.org/10.5194/bg-2015-573 2022-09-13T05:48:45Z The Baltic Sea is a unique environment as the largest body of brackish water in the world. Acidification of the surface oceans due to absorption of anthropogenic CO2 emissions is an additional stressor facing the pelagic community of the already challenging Baltic Sea. To investigate its impact on trace gas biogeochemistry, a large-scale mesocosm experiment was performed off Tvärminne Research Station, Finland in summer 2012. During the second half of the experiment, dimethylsulphide (DMS) concentrations in the highest fCO2 mesocosms (1075–1333 μatm) were 34 % lower than at ambient CO2 (350 μatm). However the net production (as measured by concentration change) of seven halocarbons analysed was not significantly affected by even the highest CO2 levels after 5 weeks exposure. Methyl iodide (CH3I) and diiodomethane (CH2I2) showed 15 % and 57 % increases in mean mesocosm concentration (3.8 ± 0.6 pmol L−1 increasing to 4.3 ± 0.4 pmol L−1 and 87.4 ± 14.9 pmol L−1 increasing to 134.4 ± 24.1 pmol L−1 respectively) during Phase II of the experiment, which were unrelated to CO2 and corresponded to 30 % lower Chl-ɑ concentrations compared to Phase I. No other iodocarbons increased or showed a peak, with mean chloroiodomethane (CH2ClI) concentrations measured at 5.3 (± 0.9) pmol L−1 and iodoethane (C2H5I) at 0.5 (± 0.1) pmol L−1. Of the concentrations of bromoform (CHBr3; mean 88.1 ± 13.2 pmol L−1), dibromomethane (CH2Br2; mean 5.3 ± 0.8 pmol L−1) and dibromochloromethane (CHBr2Cl, mean 3.0 ± 0.5 pmol L−1), only CH2Br2 showed a decrease of 17 % between Phases I and II, with CHBr3 and CHBr2Cl showing similar mean concentrations in both Phases. Outside the mesocosms, an upwelling event was responsible for bringing colder, high CO2, low pH water to the surface starting on day t16 of the experiment; this variable CO2 system with frequent upwelling events implies the community of the Baltic Sea is acclimated to regular significant declines in pH caused by up to 800 μatm fCO2. After this upwelling, DMS concentrations declined, ... Article in Journal/Newspaper Ocean acidification Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) |
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Open Polar |
collection |
Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) |
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ftplymouthml |
language |
English |
topic |
Chemistry Marine Sciences |
spellingShingle |
Chemistry Marine Sciences Webb, A Leedham-Elvidge, E Hughes, C Hopkins, FE Malin, G Bach, L Schulz, K Crawfurd, KJ Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
topic_facet |
Chemistry Marine Sciences |
description |
The Baltic Sea is a unique environment as the largest body of brackish water in the world. Acidification of the surface oceans due to absorption of anthropogenic CO2 emissions is an additional stressor facing the pelagic community of the already challenging Baltic Sea. To investigate its impact on trace gas biogeochemistry, a large-scale mesocosm experiment was performed off Tvärminne Research Station, Finland in summer 2012. During the second half of the experiment, dimethylsulphide (DMS) concentrations in the highest fCO2 mesocosms (1075–1333 μatm) were 34 % lower than at ambient CO2 (350 μatm). However the net production (as measured by concentration change) of seven halocarbons analysed was not significantly affected by even the highest CO2 levels after 5 weeks exposure. Methyl iodide (CH3I) and diiodomethane (CH2I2) showed 15 % and 57 % increases in mean mesocosm concentration (3.8 ± 0.6 pmol L−1 increasing to 4.3 ± 0.4 pmol L−1 and 87.4 ± 14.9 pmol L−1 increasing to 134.4 ± 24.1 pmol L−1 respectively) during Phase II of the experiment, which were unrelated to CO2 and corresponded to 30 % lower Chl-ɑ concentrations compared to Phase I. No other iodocarbons increased or showed a peak, with mean chloroiodomethane (CH2ClI) concentrations measured at 5.3 (± 0.9) pmol L−1 and iodoethane (C2H5I) at 0.5 (± 0.1) pmol L−1. Of the concentrations of bromoform (CHBr3; mean 88.1 ± 13.2 pmol L−1), dibromomethane (CH2Br2; mean 5.3 ± 0.8 pmol L−1) and dibromochloromethane (CHBr2Cl, mean 3.0 ± 0.5 pmol L−1), only CH2Br2 showed a decrease of 17 % between Phases I and II, with CHBr3 and CHBr2Cl showing similar mean concentrations in both Phases. Outside the mesocosms, an upwelling event was responsible for bringing colder, high CO2, low pH water to the surface starting on day t16 of the experiment; this variable CO2 system with frequent upwelling events implies the community of the Baltic Sea is acclimated to regular significant declines in pH caused by up to 800 μatm fCO2. After this upwelling, DMS concentrations declined, ... |
format |
Article in Journal/Newspaper |
author |
Webb, A Leedham-Elvidge, E Hughes, C Hopkins, FE Malin, G Bach, L Schulz, K Crawfurd, KJ |
author_facet |
Webb, A Leedham-Elvidge, E Hughes, C Hopkins, FE Malin, G Bach, L Schulz, K Crawfurd, KJ |
author_sort |
Webb, A |
title |
Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
title_short |
Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
title_full |
Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
title_fullStr |
Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
title_full_unstemmed |
Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
title_sort |
effect of ocean acidification and elevated fco2 on trace gas production by a baltic sea summer phytoplankton community |
publishDate |
2016 |
url |
http://plymsea.ac.uk/id/eprint/6801/ http://plymsea.ac.uk/id/eprint/6801/1/Webb%20et%20al%202016%20Discussion%20paper.pdf https://doi.org/10.5194/bg-2015-573 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://plymsea.ac.uk/id/eprint/6801/1/Webb%20et%20al%202016%20Discussion%20paper.pdf Webb, A; Leedham-Elvidge, E; Hughes, C; Hopkins, FE; Malin, G; Bach, L; Schulz, K; Crawfurd, KJ. 2016 Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community [in special issue: Effects of rising CO2 on a Baltic Sea plankton community: ecological and biogeochemical impacts] Biogeosciences Discussions. https://doi.org/10.5194/bg-2015-573 <https://doi.org/10.5194/bg-2015-573> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-2015-573 |
_version_ |
1766159486414749696 |