Dissolved iron measurements from 32 stations in the Central Arctic Ocean and Arctic Shelf Sea during POLARSTERN expedition ARK-XXII/2
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2012
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| _version_ | 1867171784179056640 |
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| author | Klunder, Maarten B Laan, Patrick Middag, Rob de Baar, Hein J W Bakker, Karel |
| author_facet | Klunder, Maarten B Laan, Patrick Middag, Rob de Baar, Hein J W Bakker, Karel |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Concentrations of dissolved (<0.2 µm) Fe (DFe) in the Arctic shelf seas and in the surface waters of the central Arctic Ocean are presented. In the Barents and Kara seas, near-surface DFe minima indicate depletion of DFe by phytoplankton growth. Below the surface, lower DFe concentrations in the Kara Sea (~0.4-0.6 nM) than in the Barents Sea (~0.6-0.8 nM) likely reflect scavenging removal or biological depletion of DFe. Very high DFe concentrations (>10 nM) in the bottom waters of the Laptev Sea shelf may be attributed to either sediment resuspension, sinking of brine or regeneration of DFe in the lower layers. A significant correlation (R2 = 0.60) between salinity and DFe is observed. Using d18O, salinity, nutrients and total alkalinity data, the main source for the high (>2 nM) DFe concentrations in the Amundsen and Makarov Basins is identified as (Eurasian) river water, transported with the Transpolar Drift (TPD). On the North American side of the TPD, the DFe concentrations are low (<0.8 nM) and variations are determined by the effects of sea-ice meltwater, biological depletion and remineralization and scavenging in halocline waters from the shelf. This distribution pattern of DFe is also supported by the ratio between unfiltered and dissolved Fe (high (>4) above the shelf and low (<4) off the shelf). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_780273 |
| institution | PANGAEA |
| language | en |
| publishDate | 2012 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Dissolved iron measurements from 32 stations in the Central Arctic Ocean and Arctic Shelf Sea during POLARSTERN expedition ARK-XXII/2 Klunder, Maarten B Laan, Patrick Middag, Rob de Baar, Hein J W Bakker, Karel Arctic Ocean; ARK-XXII/2; CTD/Rosette, ultra clean; CTD-UC; Date/Time of event; DEPTH, water; Elevation of event; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Iron, dissolved; Latitude of event; Longitude of event; Polarstern; PS70/246-1; PS70/255-1; PS70/258-1; PS70/260-2; PS70/261-1; PS70/266-1; PS70/268-1; PS70/285-2; PS70/291-1; PS70/295-1; PS70/299-1; PS70/301-2; PS70/302-1; PS70/306-1; PS70/309-2; PS70/309-4; PS70/310-1; PS70/316-1; PS70/319-1; PS70/326-1; PS70/328-2; PS70/333-1; PS70/338-2; PS70/342-1; PS70/349-1; PS70/352-2; PS70/363-5; PS70/371-2; PS70/372-1; PS70/373-2; PS70/379-1; PS70/382-1; PS70/385-1; PS70/389-1; PS70/400-1; PS70 SPACE DAMOCLES Concentrations of dissolved (<0.2 µm) Fe (DFe) in the Arctic shelf seas and in the surface waters of the central Arctic Ocean are presented. In the Barents and Kara seas, near-surface DFe minima indicate depletion of DFe by phytoplankton growth. Below the surface, lower DFe concentrations in the Kara Sea (~0.4-0.6 nM) than in the Barents Sea (~0.6-0.8 nM) likely reflect scavenging removal or biological depletion of DFe. Very high DFe concentrations (>10 nM) in the bottom waters of the Laptev Sea shelf may be attributed to either sediment resuspension, sinking of brine or regeneration of DFe in the lower layers. A significant correlation (R2 = 0.60) between salinity and DFe is observed. Using d18O, salinity, nutrients and total alkalinity data, the main source for the high (>2 nM) DFe concentrations in the Amundsen and Makarov Basins is identified as (Eurasian) river water, transported with the Transpolar Drift (TPD). On the North American side of the TPD, the DFe concentrations are low (<0.8 nM) and variations are determined by the effects of sea-ice meltwater, biological depletion and remineralization and scavenging in halocline waters from the shelf. This distribution pattern of DFe is also supported by the ratio between unfiltered and dissolved Fe (high (>4) above the shelf and low (<4) off the shelf). |
| title | Dissolved iron measurements from 32 stations in the Central Arctic Ocean and Arctic Shelf Sea during POLARSTERN expedition ARK-XXII/2 |
| topic | Arctic Ocean; ARK-XXII/2; CTD/Rosette, ultra clean; CTD-UC; Date/Time of event; DEPTH, water; Elevation of event; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Iron, dissolved; Latitude of event; Longitude of event; Polarstern; PS70/246-1; PS70/255-1; PS70/258-1; PS70/260-2; PS70/261-1; PS70/266-1; PS70/268-1; PS70/285-2; PS70/291-1; PS70/295-1; PS70/299-1; PS70/301-2; PS70/302-1; PS70/306-1; PS70/309-2; PS70/309-4; PS70/310-1; PS70/316-1; PS70/319-1; PS70/326-1; PS70/328-2; PS70/333-1; PS70/338-2; PS70/342-1; PS70/349-1; PS70/352-2; PS70/363-5; PS70/371-2; PS70/372-1; PS70/373-2; PS70/379-1; PS70/382-1; PS70/385-1; PS70/389-1; PS70/400-1; PS70 SPACE DAMOCLES |
| url | https://doi.org/10.1594/PANGAEA.780273 |