Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed
Shipboard measurements of eddy covariance dimethylsulfide (DMS) air–sea fluxes and seawater concentration were carried out in the North Atlantic bloom region in June/July 2011. Gas transfer coefficients ( k 660 ) show a linear dependence on mean horizontal wind speed at wind speeds up to 11 m s −1 ....
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ftcopernicus:oai:publications.copernicus.org:acp19806 2023-05-15T17:30:21+02:00 Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed Bell, T. G. De Bruyn, W. Miller, S. D. Ward, B. Christensen, K. H. Saltzman, E. S. 2018-01-15 application/pdf https://doi.org/10.5194/acp-13-11073-2013 https://www.atmos-chem-phys.net/13/11073/2013/ eng eng doi:10.5194/acp-13-11073-2013 https://www.atmos-chem-phys.net/13/11073/2013/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-13-11073-2013 2019-12-24T09:54:53Z Shipboard measurements of eddy covariance dimethylsulfide (DMS) air–sea fluxes and seawater concentration were carried out in the North Atlantic bloom region in June/July 2011. Gas transfer coefficients ( k 660 ) show a linear dependence on mean horizontal wind speed at wind speeds up to 11 m s −1 . At higher wind speeds the relationship between k 660 and wind speed weakens. At high winds, measured DMS fluxes were lower than predicted based on the linear relationship between wind speed and interfacial stress extrapolated from low to intermediate wind speeds. In contrast, the transfer coefficient for sensible heat did not exhibit this effect. The apparent suppression of air–sea gas flux at higher wind speeds appears to be related to sea state, as determined from shipboard wave measurements. These observations are consistent with the idea that long waves suppress near-surface water-side turbulence, and decrease interfacial gas transfer. This effect may be more easily observed for DMS than for less soluble gases, such as CO 2 , because the air–sea exchange of DMS is controlled by interfacial rather than bubble-mediated gas transfer under high wind speed conditions. Text North Atlantic Copernicus Publications: E-Journals Atmospheric Chemistry and Physics 13 21 11073 11087 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Shipboard measurements of eddy covariance dimethylsulfide (DMS) air–sea fluxes and seawater concentration were carried out in the North Atlantic bloom region in June/July 2011. Gas transfer coefficients ( k 660 ) show a linear dependence on mean horizontal wind speed at wind speeds up to 11 m s −1 . At higher wind speeds the relationship between k 660 and wind speed weakens. At high winds, measured DMS fluxes were lower than predicted based on the linear relationship between wind speed and interfacial stress extrapolated from low to intermediate wind speeds. In contrast, the transfer coefficient for sensible heat did not exhibit this effect. The apparent suppression of air–sea gas flux at higher wind speeds appears to be related to sea state, as determined from shipboard wave measurements. These observations are consistent with the idea that long waves suppress near-surface water-side turbulence, and decrease interfacial gas transfer. This effect may be more easily observed for DMS than for less soluble gases, such as CO 2 , because the air–sea exchange of DMS is controlled by interfacial rather than bubble-mediated gas transfer under high wind speed conditions. |
format |
Text |
author |
Bell, T. G. De Bruyn, W. Miller, S. D. Ward, B. Christensen, K. H. Saltzman, E. S. |
spellingShingle |
Bell, T. G. De Bruyn, W. Miller, S. D. Ward, B. Christensen, K. H. Saltzman, E. S. Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
author_facet |
Bell, T. G. De Bruyn, W. Miller, S. D. Ward, B. Christensen, K. H. Saltzman, E. S. |
author_sort |
Bell, T. G. |
title |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
title_short |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
title_full |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
title_fullStr |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
title_full_unstemmed |
Air–sea dimethylsulfide (DMS) gas transfer in the North Atlantic: evidence for limited interfacial gas exchange at high wind speed |
title_sort |
air–sea dimethylsulfide (dms) gas transfer in the north atlantic: evidence for limited interfacial gas exchange at high wind speed |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-13-11073-2013 https://www.atmos-chem-phys.net/13/11073/2013/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-13-11073-2013 https://www.atmos-chem-phys.net/13/11073/2013/ |
op_doi |
https://doi.org/10.5194/acp-13-11073-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
21 |
container_start_page |
11073 |
op_container_end_page |
11087 |
_version_ |
1766126718540578816 |