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Baars, Oliver; Croot, Peter L (2015): (Table 2) Zinc complexation data from POLARSTERN cruise ANT-XXIV/3. PANGAEA,, 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,

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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.
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
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)
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.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBaars, Oliver
2Date/Time of eventDate/TimeBaars, Oliver
3Latitude of eventLatitudeBaars, Oliver
4Longitude of eventLongitudeBaars, Oliver
5Elevation of eventElevationmBaars, Oliver
6DEPTH, waterDepth watermBaars, OliverGeocode
7ZincZnnmol/lBaars, OliverTitrationtotal
8ZincZnnmol/lBaars, OliverTitrationlabile (Zn')
9Zinc, standard deviationZn std dev±Baars, OliverTitrationlabile
10Ligand concentrationLigandsnmol/lBaars, OliverTitration
11Standard deviationStd dev±Baars, OliverTitrationof ligand concentration
12ConstantConstBaars, OliverTitrationstability constant log K'
13Standard deviationStd dev±Baars, OliverTitrationof constant log K'
49 data points

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