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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ftcopernicus:oai:publications.copernicus.org:bg68404 2023-05-15T17:34:22+02:00 Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study Menzel Barraqueta, Jan-Lukas Klar, Jessica K. Gledhill, Martha Schlosser, Christian Shelley, Rachel Planquette, Hélène F. Wenzel, Bernhard Sarthou, Geraldine Achterberg, Eric P. 2019-04-11 application/pdf https://doi.org/10.5194/bg-16-1525-2019 https://www.biogeosciences.net/16/1525/2019/ eng eng doi:10.5194/bg-16-1525-2019 https://www.biogeosciences.net/16/1525/2019/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-16-1525-2019 2019-12-24T09:49:20Z 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. Text North Atlantic Copernicus Publications: E-Journals Biogeosciences 16 7 1525 1542 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Menzel Barraqueta, Jan-Lukas Klar, Jessica K. Gledhill, Martha Schlosser, Christian Shelley, Rachel Planquette, Hélène F. Wenzel, Bernhard Sarthou, Geraldine Achterberg, Eric P. |
spellingShingle |
Menzel Barraqueta, Jan-Lukas Klar, Jessica K. Gledhill, Martha Schlosser, Christian Shelley, Rachel Planquette, Hélène F. Wenzel, Bernhard Sarthou, Geraldine Achterberg, Eric P. Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study |
author_facet |
Menzel Barraqueta, Jan-Lukas Klar, Jessica K. Gledhill, Martha Schlosser, Christian Shelley, Rachel Planquette, Hélène F. Wenzel, Bernhard Sarthou, Geraldine Achterberg, Eric P. |
author_sort |
Menzel Barraqueta, Jan-Lukas |
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 |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-1525-2019 https://www.biogeosciences.net/16/1525/2019/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-16-1525-2019 https://www.biogeosciences.net/16/1525/2019/ |
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 |
_version_ |
1766133170384666624 |