Baars, Oliver; Croot, Peter L (2015): (Table 2) Zinc complexation data from POLARSTERN cruise ANT-XXIV/3 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.846876, Supplement to: Baars, O; Croot, PL (2011): The speciation of dissolved zinc in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2720-2732, https://doi.org/10.1016/j.dsr2.2011.02.003
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Abstract:
The speciation of dissolved zinc (Zn) was investigated by voltammetry in the Atlantic sector of the Southern Ocean along two transects across the major frontal systems: along the Zero Meridian and across the Drake Passage. In the Southern Ocean south of the APF we found detectable labile inorganic Zn throughout the surface waters in contrast to studies from lower latitudes. Using a combination of ASV titrations and pseudopolarography revealed the presence of significant concentration of electrochemically inert Zn ligands throughout the Southern Ocean. These ligands however were nearly always saturated due to the presence of excess concentrations of dissolved Zn that were associated with the high nutrient waters south of the Antarctic Polar Front (APF). Only in surface waters did the concentration of Zn complexing ligands exceed the dissolved Zn concentrations suggesting a biological source for these ligands. Our findings have clear implications for the biogeochemical cycling of Zn and for the interpretation of paleo records utilizing Zn in opal as a tracer of Zn speciation in the water column.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -61.315817 * Median Longitude: -9.906933 * South-bound Latitude: -68.000000 * West-bound Longitude: -60.896600 * North-bound Latitude: -50.271600 * East-bound Longitude: 1.450300
Date/Time Start: 2008-02-18T20:59:00 * Date/Time End: 2008-04-07T17:02:00
Minimum DEPTH, water: 9.9 m * Maximum DEPTH, water: 199.3 m
Event(s):
PS71/107-3 * Latitude: -50.271600 * Longitude: 1.450300 * Date/Time: 2008-02-18T20:59:00 * Elevation: -3841.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS71/131-5 * Latitude: -59.000300 * Longitude: 0.000500 * Date/Time: 2008-02-24T19:37:00 * Elevation: -4597.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS71/161-1 * Latitude Start: -66.497000 * Longitude Start: 0.005500 * Latitude End: -66.498900 * Longitude End: -0.001300 * Date/Time Start: 2008-03-08T18:52:00 * Date/Time End: 2008-03-08T19:15:00 * Elevation Start: -4531.0 m * Elevation End: -4535.0 m * Location: Weddell Sea * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
Comment:
Titrations were performed on a much larger data set. The data below are from the small subset of data where significant excess ligand was present.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Baars, Oliver | |||
| 2 | Date/Time of event | Date/Time | Baars, Oliver | |||
| 3 | Latitude of event | Latitude | Baars, Oliver | |||
| 4 | Longitude of event | Longitude | Baars, Oliver | |||
| 5 | Elevation of event | Elevation | m | Baars, Oliver | ||
| 6 | DEPTH, water | Depth water | m | Baars, Oliver | Geocode | |
| 7 | Zinc | Zn | nmol/l | Baars, Oliver | Titration | total |
| 8 | Zinc | Zn | nmol/l | Baars, Oliver | Titration | labile (Zn') |
| 9 | Zinc, standard deviation | Zn std dev | ± | Baars, Oliver | Titration | labile |
| 10 | Ligand concentration | Ligands | nmol/l | Baars, Oliver | Titration | |
| 11 | Standard deviation | Std dev | ± | Baars, Oliver | Titration | of ligand concentration |
| 12 | Constant | Const | Baars, Oliver | Titration | stability constant log K' | |
| 13 | Standard deviation | Std dev | ± | Baars, Oliver | Titration | of constant log K' |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
49 data points