Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study
Atmospheric deposition is an important source of micronutrients to the ocean, but atmospheric deposition fluxes remain poorly constrained in most ocean regions due to the limited number of field observations of wet and dry atmospheric inputs. Here we present the distribution of dissolved aluminium (...
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ftdoajarticles:oai:doaj.org/article:71e71ab730b74280983028bea08861f1 2023-05-15T17:34:48+02:00 Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study J.-L. Menzel Barraqueta J. K. Klar M. Gledhill C. Schlosser R. Shelley H. F. Planquette B. Wenzel G. Sarthou E. P. Achterberg 2019-04-01T00:00:00Z https://doi.org/10.5194/bg-16-1525-2019 https://doaj.org/article/71e71ab730b74280983028bea08861f1 EN eng Copernicus Publications https://www.biogeosciences.net/16/1525/2019/bg-16-1525-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1525-2019 1726-4170 1726-4189 https://doaj.org/article/71e71ab730b74280983028bea08861f1 Biogeosciences, Vol 16, Pp 1525-1542 (2019) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/bg-16-1525-2019 2022-12-31T11:47:41Z Atmospheric deposition is an important source of micronutrients to the ocean, but atmospheric deposition fluxes remain poorly constrained in most ocean regions due to the limited number of field observations of wet and dry atmospheric inputs. Here we present the distribution of dissolved aluminium (dAl), as a tracer of atmospheric inputs, in surface waters of the Atlantic Ocean along GEOTRACES sections GA01, GA06, GA08, and GA10. We used the surface mixed-layer concentrations of dAl to calculate atmospheric deposition fluxes using a simple steady state model. We have optimized the Al fractional aerosol solubility, the dAl residence time within the surface mixed layer and the depth of the surface mixed layer for each separate cruise to calculate the atmospheric deposition fluxes. We calculated the lowest deposition fluxes of 0.15±0.1 and 0.27±0.13 g m −2 yr −1 for the South and North Atlantic Ocean ( >40 ∘ S and >40 ∘ N) respectively, and the highest fluxes of 1.8 and 3.09 g m −2 yr −1 for the south-east Atlantic and tropical Atlantic Ocean, respectively. Overall, our estimations are comparable to atmospheric dust deposition model estimates and reported field-based atmospheric deposition estimates. We note that our estimates diverge from atmospheric dust deposition model flux estimates in regions influenced by riverine Al inputs and in upwelling regions. As dAl is a key trace element in the GEOTRACES programme, the approach presented in this study allows calculations of atmospheric deposition fluxes at high spatial resolution for remote ocean regions. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Biogeosciences 16 7 1525 1542 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J.-L. Menzel Barraqueta J. K. Klar M. Gledhill C. Schlosser R. Shelley H. F. Planquette B. Wenzel G. Sarthou E. P. Achterberg Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Atmospheric deposition is an important source of micronutrients to the ocean, but atmospheric deposition fluxes remain poorly constrained in most ocean regions due to the limited number of field observations of wet and dry atmospheric inputs. Here we present the distribution of dissolved aluminium (dAl), as a tracer of atmospheric inputs, in surface waters of the Atlantic Ocean along GEOTRACES sections GA01, GA06, GA08, and GA10. We used the surface mixed-layer concentrations of dAl to calculate atmospheric deposition fluxes using a simple steady state model. We have optimized the Al fractional aerosol solubility, the dAl residence time within the surface mixed layer and the depth of the surface mixed layer for each separate cruise to calculate the atmospheric deposition fluxes. We calculated the lowest deposition fluxes of 0.15±0.1 and 0.27±0.13 g m −2 yr −1 for the South and North Atlantic Ocean ( >40 ∘ S and >40 ∘ N) respectively, and the highest fluxes of 1.8 and 3.09 g m −2 yr −1 for the south-east Atlantic and tropical Atlantic Ocean, respectively. Overall, our estimations are comparable to atmospheric dust deposition model estimates and reported field-based atmospheric deposition estimates. We note that our estimates diverge from atmospheric dust deposition model flux estimates in regions influenced by riverine Al inputs and in upwelling regions. As dAl is a key trace element in the GEOTRACES programme, the approach presented in this study allows calculations of atmospheric deposition fluxes at high spatial resolution for remote ocean regions. |
format |
Article in Journal/Newspaper |
author |
J.-L. Menzel Barraqueta J. K. Klar M. Gledhill C. Schlosser R. Shelley H. F. Planquette B. Wenzel G. Sarthou E. P. Achterberg |
author_facet |
J.-L. Menzel Barraqueta J. K. Klar M. Gledhill C. Schlosser R. Shelley H. F. Planquette B. Wenzel G. Sarthou E. P. Achterberg |
author_sort |
J.-L. Menzel Barraqueta |
title |
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
title_short |
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
title_full |
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
title_fullStr |
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
title_full_unstemmed |
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
title_sort |
atmospheric deposition fluxes over the atlantic ocean: a geotraces case study |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-1525-2019 https://doaj.org/article/71e71ab730b74280983028bea08861f1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 16, Pp 1525-1542 (2019) |
op_relation |
https://www.biogeosciences.net/16/1525/2019/bg-16-1525-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1525-2019 1726-4170 1726-4189 https://doaj.org/article/71e71ab730b74280983028bea08861f1 |
op_doi |
https://doi.org/10.5194/bg-16-1525-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
7 |
container_start_page |
1525 |
op_container_end_page |
1542 |
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1766133759022727168 |