Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic
Methyl iodide (CH3I}, bromoform (CHBr3) and dibromomethane (CH2Br2), which are produced naturally in the oceans, take part in ozone chemistry both in the troposphere and the stratosphere. The significance of oceanic upwelling regions for emissions of these trace gases in the global context is still...
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Copernicus Publications (EGU)
2014
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Online Access: | https://oceanrep.geomar.de/id/eprint/22607/ https://oceanrep.geomar.de/id/eprint/22607/1/acp-14-1255-2014.pdf https://doi.org/10.5194/acp-14-1255-2014 |
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ftoceanrep:oai:oceanrep.geomar.de:22607 2023-05-15T17:38:23+02:00 Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic Hepach, Helmke Quack, Birgit Ziska, Franziska Fuhlbruegge, Steffen Atlas, E. L. Peeken, Ilka Krüger, Kirstin Wallace, Douglas W.R. 2014-02-03 text https://oceanrep.geomar.de/id/eprint/22607/ https://oceanrep.geomar.de/id/eprint/22607/1/acp-14-1255-2014.pdf https://doi.org/10.5194/acp-14-1255-2014 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/22607/1/acp-14-1255-2014.pdf Hepach, H. , Quack, B., Ziska, F., Fuhlbruegge, S., Atlas, E. L., Peeken, I., Krüger, K. and Wallace, D. W. R. (2014) Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic. Open Access Atmospheric Chemistry and Physics, 14 (3). pp. 1255-1275. DOI 10.5194/acp-14-1255-2014 <https://doi.org/10.5194/acp-14-1255-2014>. doi:10.5194/acp-14-1255-2014 cc_by info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2014 ftoceanrep https://doi.org/10.5194/acp-14-1255-2014 2023-04-07T15:11:08Z Methyl iodide (CH3I}, bromoform (CHBr3) and dibromomethane (CH2Br2), which are produced naturally in the oceans, take part in ozone chemistry both in the troposphere and the stratosphere. The significance of oceanic upwelling regions for emissions of these trace gases in the global context is still uncertain although they have been identified as important source regions. To better quantify the role of upwelling areas in current and future climate, this paper analyzes major factors that influenced halocarbon emissions from the tropical North East Atlantic including the Mauritanian upwelling during the DRIVE expedition. Diel and regional variability of oceanic and atmospheric CH3I, CHBr3 and CH2Br2 was determined along with biological and meteorological parameters at six 24 h-stations. Low oceanic concentrations of CH3I from 0.1–5.4 pmol L-1 were equally distributed throughout the investigation area. CHBr3 of 1.0–42.4 pmol L-1 and CH2Br2 of 1.0–9.4 pmol L-1 were measured with maximum concentrations close to the Mauritanian coast. Atmospheric mixing rations of CH3I of up to 3.3, CHBr3 to 8.9 and CH2Br2 to 3.1 ppt above the upwelling and 1.8, 12.8, respectively 2.2 ppt at a Cape Verdean coast were detected during the campaign. While diel variability in CH3I emissions could be mainly ascribed to oceanic non-biological production, no main driver was identified for its emissions in the entire study region. In contrast, oceanic bromocarbons resulted from biogenic sources which were identified as regional drivers of their sea-to-air fluxes. The diel impact of wind speed on bromocarbon emissions increased with decreasing distance to the coast. The height of the marine atmospheric boundary layer (MABL) was determined as an additional factor influencing halocarbon emissions. Oceanic and atmospheric halocarbons correlated well in the study region and in combination with high oceanic CH3I, CHBr3 and CH2Br2 concentrations, local hot spots of atmospheric halocarbons could solely be explained by marine sources. This conclusion ... Article in Journal/Newspaper North East Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Atmospheric Chemistry and Physics 14 3 1255 1275 |
institution |
Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Methyl iodide (CH3I}, bromoform (CHBr3) and dibromomethane (CH2Br2), which are produced naturally in the oceans, take part in ozone chemistry both in the troposphere and the stratosphere. The significance of oceanic upwelling regions for emissions of these trace gases in the global context is still uncertain although they have been identified as important source regions. To better quantify the role of upwelling areas in current and future climate, this paper analyzes major factors that influenced halocarbon emissions from the tropical North East Atlantic including the Mauritanian upwelling during the DRIVE expedition. Diel and regional variability of oceanic and atmospheric CH3I, CHBr3 and CH2Br2 was determined along with biological and meteorological parameters at six 24 h-stations. Low oceanic concentrations of CH3I from 0.1–5.4 pmol L-1 were equally distributed throughout the investigation area. CHBr3 of 1.0–42.4 pmol L-1 and CH2Br2 of 1.0–9.4 pmol L-1 were measured with maximum concentrations close to the Mauritanian coast. Atmospheric mixing rations of CH3I of up to 3.3, CHBr3 to 8.9 and CH2Br2 to 3.1 ppt above the upwelling and 1.8, 12.8, respectively 2.2 ppt at a Cape Verdean coast were detected during the campaign. While diel variability in CH3I emissions could be mainly ascribed to oceanic non-biological production, no main driver was identified for its emissions in the entire study region. In contrast, oceanic bromocarbons resulted from biogenic sources which were identified as regional drivers of their sea-to-air fluxes. The diel impact of wind speed on bromocarbon emissions increased with decreasing distance to the coast. The height of the marine atmospheric boundary layer (MABL) was determined as an additional factor influencing halocarbon emissions. Oceanic and atmospheric halocarbons correlated well in the study region and in combination with high oceanic CH3I, CHBr3 and CH2Br2 concentrations, local hot spots of atmospheric halocarbons could solely be explained by marine sources. This conclusion ... |
format |
Article in Journal/Newspaper |
author |
Hepach, Helmke Quack, Birgit Ziska, Franziska Fuhlbruegge, Steffen Atlas, E. L. Peeken, Ilka Krüger, Kirstin Wallace, Douglas W.R. |
spellingShingle |
Hepach, Helmke Quack, Birgit Ziska, Franziska Fuhlbruegge, Steffen Atlas, E. L. Peeken, Ilka Krüger, Kirstin Wallace, Douglas W.R. Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
author_facet |
Hepach, Helmke Quack, Birgit Ziska, Franziska Fuhlbruegge, Steffen Atlas, E. L. Peeken, Ilka Krüger, Kirstin Wallace, Douglas W.R. |
author_sort |
Hepach, Helmke |
title |
Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
title_short |
Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
title_full |
Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
title_fullStr |
Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
title_full_unstemmed |
Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic |
title_sort |
drivers of diel and regional variations of halocarbon emissions from the tropical north east atlantic |
publisher |
Copernicus Publications (EGU) |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/22607/ https://oceanrep.geomar.de/id/eprint/22607/1/acp-14-1255-2014.pdf https://doi.org/10.5194/acp-14-1255-2014 |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/22607/1/acp-14-1255-2014.pdf Hepach, H. , Quack, B., Ziska, F., Fuhlbruegge, S., Atlas, E. L., Peeken, I., Krüger, K. and Wallace, D. W. R. (2014) Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic. Open Access Atmospheric Chemistry and Physics, 14 (3). pp. 1255-1275. DOI 10.5194/acp-14-1255-2014 <https://doi.org/10.5194/acp-14-1255-2014>. doi:10.5194/acp-14-1255-2014 |
op_rights |
cc_by info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-14-1255-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
3 |
container_start_page |
1255 |
op_container_end_page |
1275 |
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1766138811575697408 |