Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean
Aeolian dust transport from the Saharan/Sahel desert regions is considered the dominant external input of iron (Fe) to the surface waters of the eastern (sub-) tropical North Atlantic Ocean. To test this hypothesis, we investigated the sources of dissolved Fe (DFe) and quantified DFe fluxes to the s...
Published in: | Global Biogeochemical Cycles |
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ftoceanrep:oai:oceanrep.geomar.de:21743 2023-05-15T17:31:18+02:00 Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean Rijkenberg, M. J .A. Steigenberger, S. Powell, C. F. Van Haren, H. Patey, M. D. Baker, A. R. Achterberg, Eric P. 2012 https://oceanrep.geomar.de/id/eprint/21743/ https://doi.org/10.1029/2011GB004264 unknown AGU (American Geophysical Union) Rijkenberg, M. J. A., Steigenberger, S., Powell, C. F., Van Haren, H., Patey, M. D., Baker, A. R. and Achterberg, E. P. (2012) Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean. Global Biogeochemical Cycles, 26 (3). GB3004. DOI 10.1029/2011GB004264 <https://doi.org/10.1029/2011GB004264>. doi:10.1029/2011GB004264 Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/2011GB004264 2023-04-07T15:09:49Z Aeolian dust transport from the Saharan/Sahel desert regions is considered the dominant external input of iron (Fe) to the surface waters of the eastern (sub-) tropical North Atlantic Ocean. To test this hypothesis, we investigated the sources of dissolved Fe (DFe) and quantified DFe fluxes to the surface ocean in this region. In winter 2008, surface water DFe concentrations varied between <0.1 nM and 0.37 nM, with an average of 0.13 ̃ 0.07 nM DFe (n = 194). A strong correlation between mixed layer averaged concentrations of dissolved aluminum (DAl), a proxy for dust input, and DFe indicated dust as a source of DFe to the surface ocean. The importance of Aeolian nutrient input was further confirmed by an increase of 0.1 nM DFe and 0.05 μM phosphate during a repeat transect before and after a dust event. An exponential decrease of DFe with increasing distance from the African continent, suggested that continental shelf waters were a source of DFe to the northern part of our study area. Relatively high Fe:C ratios of up to 3 ° 10°5 (C derived from apparent oxygen utilization (AOU)) indicated an external source of Fe to these African continental shelf waters. Below the wind mixed layer along 12°N, enhanced DFe concentrations (>1.5 nM) correlated positively with apparent oxygen utilization (AOU) and showed the importance of organic matter remineralization as an DFe source. As a consequence, vertical diffusive mixing formed an important Fe flux to the surface ocean in this region, even surpassing that of a major dust event. © 2012. American Geophysical Union. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global Biogeochemical Cycles 26 3 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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description |
Aeolian dust transport from the Saharan/Sahel desert regions is considered the dominant external input of iron (Fe) to the surface waters of the eastern (sub-) tropical North Atlantic Ocean. To test this hypothesis, we investigated the sources of dissolved Fe (DFe) and quantified DFe fluxes to the surface ocean in this region. In winter 2008, surface water DFe concentrations varied between <0.1 nM and 0.37 nM, with an average of 0.13 ̃ 0.07 nM DFe (n = 194). A strong correlation between mixed layer averaged concentrations of dissolved aluminum (DAl), a proxy for dust input, and DFe indicated dust as a source of DFe to the surface ocean. The importance of Aeolian nutrient input was further confirmed by an increase of 0.1 nM DFe and 0.05 μM phosphate during a repeat transect before and after a dust event. An exponential decrease of DFe with increasing distance from the African continent, suggested that continental shelf waters were a source of DFe to the northern part of our study area. Relatively high Fe:C ratios of up to 3 ° 10°5 (C derived from apparent oxygen utilization (AOU)) indicated an external source of Fe to these African continental shelf waters. Below the wind mixed layer along 12°N, enhanced DFe concentrations (>1.5 nM) correlated positively with apparent oxygen utilization (AOU) and showed the importance of organic matter remineralization as an DFe source. As a consequence, vertical diffusive mixing formed an important Fe flux to the surface ocean in this region, even surpassing that of a major dust event. © 2012. American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Rijkenberg, M. J .A. Steigenberger, S. Powell, C. F. Van Haren, H. Patey, M. D. Baker, A. R. Achterberg, Eric P. |
spellingShingle |
Rijkenberg, M. J .A. Steigenberger, S. Powell, C. F. Van Haren, H. Patey, M. D. Baker, A. R. Achterberg, Eric P. Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
author_facet |
Rijkenberg, M. J .A. Steigenberger, S. Powell, C. F. Van Haren, H. Patey, M. D. Baker, A. R. Achterberg, Eric P. |
author_sort |
Rijkenberg, M. J .A. |
title |
Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
title_short |
Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
title_full |
Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
title_fullStr |
Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
title_full_unstemmed |
Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean |
title_sort |
fluxes and distribution of dissolved iron in the eastern (sub-) tropical north atlantic ocean |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/21743/ https://doi.org/10.1029/2011GB004264 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Rijkenberg, M. J. A., Steigenberger, S., Powell, C. F., Van Haren, H., Patey, M. D., Baker, A. R. and Achterberg, E. P. (2012) Fluxes and distribution of dissolved iron in the eastern (sub-) tropical North Atlantic Ocean. Global Biogeochemical Cycles, 26 (3). GB3004. DOI 10.1029/2011GB004264 <https://doi.org/10.1029/2011GB004264>. doi:10.1029/2011GB004264 |
op_doi |
https://doi.org/10.1029/2011GB004264 |
container_title |
Global Biogeochemical Cycles |
container_volume |
26 |
container_issue |
3 |
_version_ |
1766128799307530240 |