Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean
Dimethyl sulfide and volatile organic compounds (VOCs) are important for atmospheric chemistry. The emissions of biogenically derived organic gases, including dimethyl sulfide and especially isoprene, are not well constrained in the Southern Ocean. Due to a paucity of measurements, the role of the o...
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2020
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:79812 2023-08-27T04:12:10+02:00 Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean Wohl, Charel Brown, Ian Kitidis, Vassilis Jones, Anna E. Sturges, William T. Nightingale, Philip D. Yang, Mingxi 2020-05-15 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/79812/ https://ueaeprints.uea.ac.uk/id/eprint/79812/1/bg_17_2593_2020.pdf https://doi.org/10.5194/bg-17-2593-2020 en eng https://ueaeprints.uea.ac.uk/id/eprint/79812/1/bg_17_2593_2020.pdf Wohl, Charel, Brown, Ian, Kitidis, Vassilis, Jones, Anna E., Sturges, William T., Nightingale, Philip D. and Yang, Mingxi (2020) Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean. Biogeosciences, 17 (9). pp. 2593-2619. ISSN 1726-4170 doi:10.5194/bg-17-2593-2020 cc_by Article PeerReviewed 2020 ftuniveastangl https://doi.org/10.5194/bg-17-2593-2020 2023-08-10T22:32:32Z Dimethyl sulfide and volatile organic compounds (VOCs) are important for atmospheric chemistry. The emissions of biogenically derived organic gases, including dimethyl sulfide and especially isoprene, are not well constrained in the Southern Ocean. Due to a paucity of measurements, the role of the ocean in the atmospheric budgets of atmospheric methanol, acetone, and acetaldehyde is even more poorly known. In order to quantify the air-sea fluxes of these gases, we measured their seawater concentrations and air mixing ratios in the Atlantic sector of the Southern Ocean, along a ĝˆ1/4 11 000 km long transect at approximately 60ĝˆ S in February-April 2019. Concentrations, oceanic saturations, and estimated fluxes of five simultaneously sampled gases (dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde) are presented here. Campaign mean (±1σ) surface water concentrations of dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde were 2.60 (±3.94), 0.0133 (±0.0063), 67 (±35), 5.5 (±2.5), and 2.6 (±2.7) nmol dm-3 respectively. In this dataset, seawater isoprene and methanol concentrations correlated positively. Furthermore, seawater acetone, methanol, and isoprene concentrations were found to correlate negatively with the fugacity of carbon dioxide, possibly due to a common biological origin. Campaign mean (±1σ) air mixing ratios of dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde were 0.17 (±0.09), 0.053 (±0.034), 0.17 (±0.08), 0.081 (±0.031), and 0.049 (±0.040) ppbv. We observed diel changes in averaged acetaldehyde concentrations in seawater and ambient air (and to a lesser degree also for acetone and isoprene), which suggest light-driven production. Campaign mean (±1σ) fluxes of 4.3 (±7.4) μmol m-2 d-1 DMS and 0.028 (±0.021) μmol m-2 d-1 isoprene are determined where a positive flux indicates from the ocean to the atmosphere. Methanol was largely undersaturated in the surface ocean with a mean (±1σ) net flux of -2.4 (±4.7) μmol m-2 d-1, but it also had a few occasional episodes ... Article in Journal/Newspaper Southern Ocean University of East Anglia: UEA Digital Repository Southern Ocean Biogeosciences 17 9 2593 2619 |
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Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
Dimethyl sulfide and volatile organic compounds (VOCs) are important for atmospheric chemistry. The emissions of biogenically derived organic gases, including dimethyl sulfide and especially isoprene, are not well constrained in the Southern Ocean. Due to a paucity of measurements, the role of the ocean in the atmospheric budgets of atmospheric methanol, acetone, and acetaldehyde is even more poorly known. In order to quantify the air-sea fluxes of these gases, we measured their seawater concentrations and air mixing ratios in the Atlantic sector of the Southern Ocean, along a ĝˆ1/4 11 000 km long transect at approximately 60ĝˆ S in February-April 2019. Concentrations, oceanic saturations, and estimated fluxes of five simultaneously sampled gases (dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde) are presented here. Campaign mean (±1σ) surface water concentrations of dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde were 2.60 (±3.94), 0.0133 (±0.0063), 67 (±35), 5.5 (±2.5), and 2.6 (±2.7) nmol dm-3 respectively. In this dataset, seawater isoprene and methanol concentrations correlated positively. Furthermore, seawater acetone, methanol, and isoprene concentrations were found to correlate negatively with the fugacity of carbon dioxide, possibly due to a common biological origin. Campaign mean (±1σ) air mixing ratios of dimethyl sulfide, isoprene, methanol, acetone, and acetaldehyde were 0.17 (±0.09), 0.053 (±0.034), 0.17 (±0.08), 0.081 (±0.031), and 0.049 (±0.040) ppbv. We observed diel changes in averaged acetaldehyde concentrations in seawater and ambient air (and to a lesser degree also for acetone and isoprene), which suggest light-driven production. Campaign mean (±1σ) fluxes of 4.3 (±7.4) μmol m-2 d-1 DMS and 0.028 (±0.021) μmol m-2 d-1 isoprene are determined where a positive flux indicates from the ocean to the atmosphere. Methanol was largely undersaturated in the surface ocean with a mean (±1σ) net flux of -2.4 (±4.7) μmol m-2 d-1, but it also had a few occasional episodes ... |
format |
Article in Journal/Newspaper |
author |
Wohl, Charel Brown, Ian Kitidis, Vassilis Jones, Anna E. Sturges, William T. Nightingale, Philip D. Yang, Mingxi |
spellingShingle |
Wohl, Charel Brown, Ian Kitidis, Vassilis Jones, Anna E. Sturges, William T. Nightingale, Philip D. Yang, Mingxi Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
author_facet |
Wohl, Charel Brown, Ian Kitidis, Vassilis Jones, Anna E. Sturges, William T. Nightingale, Philip D. Yang, Mingxi |
author_sort |
Wohl, Charel |
title |
Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
title_short |
Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
title_full |
Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
title_fullStr |
Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
title_full_unstemmed |
Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean |
title_sort |
underway seawater and atmospheric measurements of volatile organic compounds in the southern ocean |
publishDate |
2020 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/79812/ https://ueaeprints.uea.ac.uk/id/eprint/79812/1/bg_17_2593_2020.pdf https://doi.org/10.5194/bg-17-2593-2020 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/79812/1/bg_17_2593_2020.pdf Wohl, Charel, Brown, Ian, Kitidis, Vassilis, Jones, Anna E., Sturges, William T., Nightingale, Philip D. and Yang, Mingxi (2020) Underway seawater and atmospheric measurements of volatile organic compounds in the Southern Ocean. Biogeosciences, 17 (9). pp. 2593-2619. ISSN 1726-4170 doi:10.5194/bg-17-2593-2020 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.5194/bg-17-2593-2020 |
container_title |
Biogeosciences |
container_volume |
17 |
container_issue |
9 |
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2593 |
op_container_end_page |
2619 |
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1775356024488722432 |