Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean
Uncertainty in the CO2 gas transfer velocity (K660) severely limits the accuracy of air-sea CO2 flux calculations and hence hinders our ability to produce realistic climate projections. Recent field observations have suggested substantial variability in K660, especially at low and high wind speeds....
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ftnerc:oai:nora.nerc.ac.uk:530324 2023-05-15T18:24:57+02:00 Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean Yang, Mingxi Smyth, Timothy Kitidis, Vassilis Brown, Ian Wohl, Charel Yelland, Margaret Bell, Thomas 2021-04 http://nora.nerc.ac.uk/id/eprint/530324/ https://doi.org/10.5194/egusphere-egu21-4601 unknown Yang, Mingxi; Smyth, Timothy; Kitidis, Vassilis; Brown, Ian; Wohl, Charel; Yelland, Margaret orcid:0000-0002-0936-4957 Bell, Thomas. 2021 Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean. In: EGU General Assembly 2021, Online, 19-30 April 2021. Publication - Conference Item NonPeerReviewed 2021 ftnerc https://doi.org/10.5194/egusphere-egu21-4601 2023-02-04T19:52:08Z Uncertainty in the CO2 gas transfer velocity (K660) severely limits the accuracy of air-sea CO2 flux calculations and hence hinders our ability to produce realistic climate projections. Recent field observations have suggested substantial variability in K660, especially at low and high wind speeds. Laboratory experiments have shown that naturally occurring surface active organic materials, or surfactants, can suppress gas transfer. Here we provide direct open ocean evidence of gas transfer suppression due to surfactants from a ~11,000 km long research expedition by making measurements of the gas transfer efficiency (GTE) along with direct observation of K660. GTE varied by 20% during the Southern Ocean transect and was distinct in different watermasses. Furthermore GTE correlated with and can explain about 9% of the scatter in K660, suggesting that surfactants exert a measurable influence on air-sea CO2 flux. Relative gas transfer suppression due to surfactants was ~30% at a global mean wind speed of 7 m s-1 and was more important at lower wind speeds. Neglecting surfactant suppression may result in substantial spatial and temporal biases in the computed air-sea CO2 fluxes. Text Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean |
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Natural Environment Research Council: NERC Open Research Archive |
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Uncertainty in the CO2 gas transfer velocity (K660) severely limits the accuracy of air-sea CO2 flux calculations and hence hinders our ability to produce realistic climate projections. Recent field observations have suggested substantial variability in K660, especially at low and high wind speeds. Laboratory experiments have shown that naturally occurring surface active organic materials, or surfactants, can suppress gas transfer. Here we provide direct open ocean evidence of gas transfer suppression due to surfactants from a ~11,000 km long research expedition by making measurements of the gas transfer efficiency (GTE) along with direct observation of K660. GTE varied by 20% during the Southern Ocean transect and was distinct in different watermasses. Furthermore GTE correlated with and can explain about 9% of the scatter in K660, suggesting that surfactants exert a measurable influence on air-sea CO2 flux. Relative gas transfer suppression due to surfactants was ~30% at a global mean wind speed of 7 m s-1 and was more important at lower wind speeds. Neglecting surfactant suppression may result in substantial spatial and temporal biases in the computed air-sea CO2 fluxes. |
format |
Text |
author |
Yang, Mingxi Smyth, Timothy Kitidis, Vassilis Brown, Ian Wohl, Charel Yelland, Margaret Bell, Thomas |
spellingShingle |
Yang, Mingxi Smyth, Timothy Kitidis, Vassilis Brown, Ian Wohl, Charel Yelland, Margaret Bell, Thomas Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
author_facet |
Yang, Mingxi Smyth, Timothy Kitidis, Vassilis Brown, Ian Wohl, Charel Yelland, Margaret Bell, Thomas |
author_sort |
Yang, Mingxi |
title |
Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
title_short |
Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
title_full |
Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
title_fullStr |
Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
title_full_unstemmed |
Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean |
title_sort |
suppression of air-sea co2 transfer by surfactants – direct evidence from the southern ocean |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/530324/ https://doi.org/10.5194/egusphere-egu21-4601 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Yang, Mingxi; Smyth, Timothy; Kitidis, Vassilis; Brown, Ian; Wohl, Charel; Yelland, Margaret orcid:0000-0002-0936-4957 Bell, Thomas. 2021 Suppression of air-sea CO2 transfer by surfactants – direct evidence from the Southern Ocean. In: EGU General Assembly 2021, Online, 19-30 April 2021. |
op_doi |
https://doi.org/10.5194/egusphere-egu21-4601 |
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1766206006778396672 |