Abstract
The speciation of iron was investigated in three shelf seas and three deep basins of the Arctic Ocean in 2007. The dissolved fraction ( 3 nM on the shelves and [TDFe] <2 nM in the Makarov Basin). A relative enrichment of particulate Fe toward the bottom was revealed at all stations, indicating Fe export toward the deep ocean. In deep waters, dissolved ligands became less saturated with Fe (increase of [Excess L]/[Fe]) from the Nansen Basin via the Amundsen Basin toward the Makarov Basin. This trend was explained by the reactivity of the ligands, higher (log alpha > 13.5) in the Nansen and Amundsen basins than in the Makarov Basin (log alpha <13) where the sources of Fe and ligands were limited. The ligands became nearly saturated with depth in the Amundsen and Nansen Basins, favoring Fe removal in the deep ocean, whereas in the deep Makarov Basin, they became unsaturated with depth. Still here scavenging occurred. Although scavenging of Fe was attenuated by the presence of unsaturated organic ligands, their low reactivity in combination with a lack of sources of Fe in the Makarov Basin might be the reason of a net export of Fe to the sediment.
Original language | English |
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Article number | 10009 |
Number of pages | 21 |
Journal | Journal of geophysical research-Oceans |
Volume | 116 |
DOIs | |
Publication status | Published - 13-Oct-2011 |
Keywords
- CATHODIC STRIPPING VOLTAMMETRY
- DIFFERENT SIZE FRACTIONS
- NATURAL ORGANIC-LIGANDS
- SMALL COLLOIDAL IRON
- SOUTHERN-OCEAN
- DISSOLVED IRON
- EXOPOLYMER PARTICLES
- ATLANTIC-OCEAN
- NORTH-ATLANTIC
- FAST ICE
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Dive into the research topics of 'Distinct trends in the speciation of iron between the shallow shelf seas and the deep basins of the Arctic Ocean'. Together they form a unique fingerprint.Datasets
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(Table 2b) Determination of ligand characteristics in unfiltered samples taken during POLARSTERN expedition ARK-XXII/2 - determination of a lower limit using dissolved iron
Thuróczy, C.-E. (Contributor), Gerringa, L. J. A. (Contributor), Klunder, M. B. (Contributor), Laan, P. (Contributor), Le Guitton, M. (Contributor) & Baar ,de, H. (Contributor), University of Groningen, 20-Nov-2011
Dataset
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(Table 2a) Determination of ligand characteristics in unfiltered samples taken during POLARSTERN expedition ARK-XXII/2 - determination of an upper limit using total dissolvable iron
Thuróczy, C.-E. (Contributor), Gerringa, L. J. A. (Contributor), Klunder, M. B. (Contributor), Laan, P. (Contributor), Le Guitton, M. (Contributor) & Baar ,de, H. (Contributor), University of Groningen, 20-Nov-2011
Dataset
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(Table 1) Dissolved iron concentration and ligand characteristics from 7 stations in the Central Arctic Ocean and Arctic Shelf Sea during POLARSTERN expedition ARK-XXII/2
Thuróczy, C.-E. (Contributor), Gerringa, L. J. A. (Contributor), Klunder, M. B. (Contributor), Laan, P. (Contributor), Le Guitton, M. (Contributor) & Baar ,de, H. (Contributor), University of Groningen, 20-Nov-2011
Dataset