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...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications (EGU)
2016
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Online Access: | https://oceanrep.geomar.de/id/eprint/33348/ https://oceanrep.geomar.de/id/eprint/33348/1/bg-13-4595-2016.pdf https://oceanrep.geomar.de/id/eprint/33348/2/bg-13-4595-2016-supplement.pdf https://doi.org/10.5194/bg-13-4595-2016 |
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ftoceanrep:oai:oceanrep.geomar.de:33348 2023-05-15T17:52:02+02:00 Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community Webb, Alison L. Leedham-Elvidge, Emma Hughes, Claire Hopkins, Frances E. Malin, Gill Bach, Lennart T. Schulz, Kai Crawfurd, Kate Brussaard, Corina P. D. Stuhr, Annegret Riebesell, Ulf Liss, Peter S. 2016-08-15 text https://oceanrep.geomar.de/id/eprint/33348/ https://oceanrep.geomar.de/id/eprint/33348/1/bg-13-4595-2016.pdf https://oceanrep.geomar.de/id/eprint/33348/2/bg-13-4595-2016-supplement.pdf https://doi.org/10.5194/bg-13-4595-2016 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/33348/1/bg-13-4595-2016.pdf https://oceanrep.geomar.de/id/eprint/33348/2/bg-13-4595-2016-supplement.pdf Webb, A. L., Leedham-Elvidge, E., Hughes, C., Hopkins, F. E., Malin, G., Bach, L. T. , Schulz, K., Crawfurd, K., Brussaard, C. P. D., Stuhr, A., Riebesell, U. and Liss, P. S. (2016) Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community. Open Access Biogeosciences (BG), 13 . pp. 4595-4613. DOI 10.5194/bg-13-4595-2016 <https://doi.org/10.5194/bg-13-4595-2016>. doi:10.5194/bg-13-4595-2016 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2016 ftoceanrep https://doi.org/10.5194/bg-13-4595-2016 2023-04-07T15:26:30Z 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, dimethylsulfide (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 increasing to 4.3 ± 0.4 pmol L−1 and 87.4 ± 14.9 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 a 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 that 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, but halocarbon ... Article in Journal/Newspaper Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 13 15 4595 4613 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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, dimethylsulfide (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 increasing to 4.3 ± 0.4 pmol L−1 and 87.4 ± 14.9 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 a 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 that 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, but halocarbon ... |
format |
Article in Journal/Newspaper |
author |
Webb, Alison L. Leedham-Elvidge, Emma Hughes, Claire Hopkins, Frances E. Malin, Gill Bach, Lennart T. Schulz, Kai Crawfurd, Kate Brussaard, Corina P. D. Stuhr, Annegret Riebesell, Ulf Liss, Peter S. |
spellingShingle |
Webb, Alison L. Leedham-Elvidge, Emma Hughes, Claire Hopkins, Frances E. Malin, Gill Bach, Lennart T. Schulz, Kai Crawfurd, Kate Brussaard, Corina P. D. Stuhr, Annegret Riebesell, Ulf Liss, Peter S. Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community |
author_facet |
Webb, Alison L. Leedham-Elvidge, Emma Hughes, Claire Hopkins, Frances E. Malin, Gill Bach, Lennart T. Schulz, Kai Crawfurd, Kate Brussaard, Corina P. D. Stuhr, Annegret Riebesell, Ulf Liss, Peter S. |
author_sort |
Webb, Alison L. |
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 |
publisher |
Copernicus Publications (EGU) |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/33348/ https://oceanrep.geomar.de/id/eprint/33348/1/bg-13-4595-2016.pdf https://oceanrep.geomar.de/id/eprint/33348/2/bg-13-4595-2016-supplement.pdf https://doi.org/10.5194/bg-13-4595-2016 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/33348/1/bg-13-4595-2016.pdf https://oceanrep.geomar.de/id/eprint/33348/2/bg-13-4595-2016-supplement.pdf Webb, A. L., Leedham-Elvidge, E., Hughes, C., Hopkins, F. E., Malin, G., Bach, L. T. , Schulz, K., Crawfurd, K., Brussaard, C. P. D., Stuhr, A., Riebesell, U. and Liss, P. S. (2016) Effect of ocean acidification and elevated fCO2 on trace gas production by a Baltic Sea summer phytoplankton community. Open Access Biogeosciences (BG), 13 . pp. 4595-4613. DOI 10.5194/bg-13-4595-2016 <https://doi.org/10.5194/bg-13-4595-2016>. doi:10.5194/bg-13-4595-2016 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-4595-2016 |
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Biogeosciences |
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13 |
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4595 |
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