Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean
Air-sea fluxes and bulk seawater and atmospheric concentrations of bromoform (CHBr 3 ) and dibromomethane (CH 2 Br 2 ) were measured during two research cruises in the northeast Atlantic (53–59° N, June–July 2006) and tropical eastern Atlantic Ocean including over the African coastal upwelling syste...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-9-1805-2009 https://www.atmos-chem-phys.net/9/1805/2009/ |
id |
ftcopernicus:oai:publications.copernicus.org:acp5462 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:acp5462 2023-05-15T17:34:06+02:00 Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean Carpenter, L. J. Jones, C. E. Dunk, R. M. Hornsby, K. E. Woeltjen, J. 2018-01-15 application/pdf https://doi.org/10.5194/acp-9-1805-2009 https://www.atmos-chem-phys.net/9/1805/2009/ eng eng doi:10.5194/acp-9-1805-2009 https://www.atmos-chem-phys.net/9/1805/2009/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-9-1805-2009 2019-12-24T09:57:58Z Air-sea fluxes and bulk seawater and atmospheric concentrations of bromoform (CHBr 3 ) and dibromomethane (CH 2 Br 2 ) were measured during two research cruises in the northeast Atlantic (53–59° N, June–July 2006) and tropical eastern Atlantic Ocean including over the African coastal upwelling system (16–35° N May–June 2007). Saturations and sea-air fluxes of these compounds generally decreased in the order coastal > upwelling > shelf > open ocean, and outside of coastal regions, a broad trend of elevated surface seawater concentrations with high chlorophyll- a was observed. We show that upwelling regions (coastal and equatorial) represent regional hot spots of bromocarbons, but are probably not of major significance globally, contributing at most a few percent of the total global emissions of CHBr 3 and CH 2 Br 2 . From limited data from eastern Atlantic coastlines, we tentatively suggest that globally, coastal oceans (depth <180 m) together contribute ~2.5 (1.4–3.5) Gmol Br yr −1 of CHBr 3 , excluding influences from anthropogenic sources such as coastal power stations. This flux estimate is close to current estimates of the total open ocean source. We also show that the concentration ratio of CH 2 Br 2 /CHBr 3 in seawater is a strong function of concentration (and location), with a lower CH 2 Br 2 /CHBr 3 ratio found in coastal regions near to macroalgal sources. Text North Atlantic Northeast Atlantic Copernicus Publications: E-Journals Atmospheric Chemistry and Physics 9 5 1805 1816 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Air-sea fluxes and bulk seawater and atmospheric concentrations of bromoform (CHBr 3 ) and dibromomethane (CH 2 Br 2 ) were measured during two research cruises in the northeast Atlantic (53–59° N, June–July 2006) and tropical eastern Atlantic Ocean including over the African coastal upwelling system (16–35° N May–June 2007). Saturations and sea-air fluxes of these compounds generally decreased in the order coastal > upwelling > shelf > open ocean, and outside of coastal regions, a broad trend of elevated surface seawater concentrations with high chlorophyll- a was observed. We show that upwelling regions (coastal and equatorial) represent regional hot spots of bromocarbons, but are probably not of major significance globally, contributing at most a few percent of the total global emissions of CHBr 3 and CH 2 Br 2 . From limited data from eastern Atlantic coastlines, we tentatively suggest that globally, coastal oceans (depth <180 m) together contribute ~2.5 (1.4–3.5) Gmol Br yr −1 of CHBr 3 , excluding influences from anthropogenic sources such as coastal power stations. This flux estimate is close to current estimates of the total open ocean source. We also show that the concentration ratio of CH 2 Br 2 /CHBr 3 in seawater is a strong function of concentration (and location), with a lower CH 2 Br 2 /CHBr 3 ratio found in coastal regions near to macroalgal sources. |
format |
Text |
author |
Carpenter, L. J. Jones, C. E. Dunk, R. M. Hornsby, K. E. Woeltjen, J. |
spellingShingle |
Carpenter, L. J. Jones, C. E. Dunk, R. M. Hornsby, K. E. Woeltjen, J. Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
author_facet |
Carpenter, L. J. Jones, C. E. Dunk, R. M. Hornsby, K. E. Woeltjen, J. |
author_sort |
Carpenter, L. J. |
title |
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
title_short |
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
title_full |
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
title_fullStr |
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
title_full_unstemmed |
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean |
title_sort |
air-sea fluxes of biogenic bromine from the tropical and north atlantic ocean |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-9-1805-2009 https://www.atmos-chem-phys.net/9/1805/2009/ |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-9-1805-2009 https://www.atmos-chem-phys.net/9/1805/2009/ |
op_doi |
https://doi.org/10.5194/acp-9-1805-2009 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
9 |
container_issue |
5 |
container_start_page |
1805 |
op_container_end_page |
1816 |
_version_ |
1766132816251191296 |