Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation
Atmospheric deposition fluxes of soluble nutrients (N, P, Si, Fe, Co, Zn) to the tropical North Atlantic were determined during cruise M55 of the German SOLAS programme. Nutrient fluxes were highest in the east of the section along 10°N, owing to the proximity of source regions in West Africa and Eu...
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ftoceanrep:oai:oceanrep.geomar.de:5998 2023-05-15T17:34:06+02:00 Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation Baker, A. R. Weston, K. Kelly, S. D. Voss, M. Streu, Peter Cape, J .N. 2007 text https://oceanrep.geomar.de/id/eprint/5998/ https://oceanrep.geomar.de/id/eprint/5998/1/1-s2.0-S0967063707001793-main.pdf https://doi.org/10.1016/j.dsr.2007.07.001 en eng Elsevier https://oceanrep.geomar.de/id/eprint/5998/1/1-s2.0-S0967063707001793-main.pdf Baker, A. R., Weston, K., Kelly, S. D., Voss, M., Streu, P. and Cape, J. N. (2007) Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation. Deep Sea Research Part I: Oceanographic Research Papers, 54 (10). pp. 1704-1720. DOI 10.1016/j.dsr.2007.07.001 <https://doi.org/10.1016/j.dsr.2007.07.001>. doi:10.1016/j.dsr.2007.07.001 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2007 ftoceanrep https://doi.org/10.1016/j.dsr.2007.07.001 2023-04-07T14:51:58Z Atmospheric deposition fluxes of soluble nutrients (N, P, Si, Fe, Co, Zn) to the tropical North Atlantic were determined during cruise M55 of the German SOLAS programme. Nutrient fluxes were highest in the east of the section along 10°N, owing to the proximity of source regions in West Africa and Europe, and lowest in the west, for both dry and wet deposition modes. In common with other recent studies, atmospheric P and Si inputs during M55 were strongly depleted relative to the stoichiometry of phytoplankton Fe, N, P and Si requirements. Atmospheric N inputs were equivalent to 0.1–4.7% of observed primary productivity during the cruise. Atmospheric nutrient supply was also compared to observed nitrogen fixation rates during M55. While atmospheric Fe supply may have been sufficient to support N fixation (depending on the relationship between our simple Fe leaching experiment and aerosol Fe dissolution in seawater), atmospheric P supply was well below the required rate. The stable nitrogen isotope composition of nitrate–N in aerosol and rain was also determined. Results of a simple model indicate that atmospheric deposition and nitrogen fixation introduce similar amounts of isotopically light nitrogen into surface waters of the study region. This implies that nitrogen isotope-based methods would overestimate nitrogen fixation here by a factor of 2, if atmospheric inputs were not taken into account. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Deep Sea Research Part I: Oceanographic Research Papers 54 10 1704 1720 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Atmospheric deposition fluxes of soluble nutrients (N, P, Si, Fe, Co, Zn) to the tropical North Atlantic were determined during cruise M55 of the German SOLAS programme. Nutrient fluxes were highest in the east of the section along 10°N, owing to the proximity of source regions in West Africa and Europe, and lowest in the west, for both dry and wet deposition modes. In common with other recent studies, atmospheric P and Si inputs during M55 were strongly depleted relative to the stoichiometry of phytoplankton Fe, N, P and Si requirements. Atmospheric N inputs were equivalent to 0.1–4.7% of observed primary productivity during the cruise. Atmospheric nutrient supply was also compared to observed nitrogen fixation rates during M55. While atmospheric Fe supply may have been sufficient to support N fixation (depending on the relationship between our simple Fe leaching experiment and aerosol Fe dissolution in seawater), atmospheric P supply was well below the required rate. The stable nitrogen isotope composition of nitrate–N in aerosol and rain was also determined. Results of a simple model indicate that atmospheric deposition and nitrogen fixation introduce similar amounts of isotopically light nitrogen into surface waters of the study region. This implies that nitrogen isotope-based methods would overestimate nitrogen fixation here by a factor of 2, if atmospheric inputs were not taken into account. |
format |
Article in Journal/Newspaper |
author |
Baker, A. R. Weston, K. Kelly, S. D. Voss, M. Streu, Peter Cape, J .N. |
spellingShingle |
Baker, A. R. Weston, K. Kelly, S. D. Voss, M. Streu, Peter Cape, J .N. Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
author_facet |
Baker, A. R. Weston, K. Kelly, S. D. Voss, M. Streu, Peter Cape, J .N. |
author_sort |
Baker, A. R. |
title |
Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
title_short |
Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
title_full |
Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
title_fullStr |
Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
title_full_unstemmed |
Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation |
title_sort |
dry and wet deposition of nutrients from the tropical atlantic atmosphere: links to primary productivity and nitrogen fixation |
publisher |
Elsevier |
publishDate |
2007 |
url |
https://oceanrep.geomar.de/id/eprint/5998/ https://oceanrep.geomar.de/id/eprint/5998/1/1-s2.0-S0967063707001793-main.pdf https://doi.org/10.1016/j.dsr.2007.07.001 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/5998/1/1-s2.0-S0967063707001793-main.pdf Baker, A. R., Weston, K., Kelly, S. D., Voss, M., Streu, P. and Cape, J. N. (2007) Dry and wet deposition of nutrients from the tropical Atlantic atmosphere: Links to primary productivity and nitrogen fixation. Deep Sea Research Part I: Oceanographic Research Papers, 54 (10). pp. 1704-1720. DOI 10.1016/j.dsr.2007.07.001 <https://doi.org/10.1016/j.dsr.2007.07.001>. doi:10.1016/j.dsr.2007.07.001 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2007.07.001 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
54 |
container_issue |
10 |
container_start_page |
1704 |
op_container_end_page |
1720 |
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1766132812230950912 |