Abouchami, Wafa; Galer, Stephen J G; de Baar, Hein J W; Alderkamp, Anne-Carlijn; Middag, Rob; Laan, Patrick; Feldmann, H; Andreae, Meinrat O (2011): (Table 1) Cadmium and nutrient concentration of surface waters sampled during POLARSTERN cruise ANT-XXIV/III [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.805890, Supplement to: Abouchami, W et al. (2011): Modulation of the Southern Ocean cadmium isotope signature by ocean circulation and primary productivity. Earth and Planetary Science Letters, 305(1-2), 83-91, https://doi.org/10.1016/j.epsl.2011.02.044
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Abstract:
The High Nutrient Low Chlorophyll (HNLC) Southern Ocean plays a key role in regulating the biological pump and the global carbon cycle. Here we examine the efficacy of stable cadmium (Cd) isotope fractionation for detecting differences in biological productivity between regions. Our results show strong meridional Cd isotope and concentration gradients modulated by the Antarctic Fronts, with a clear biogeochemical divide located near 56°S. The coincidence of the Cd isotope divide with the Southern Boundary of the Antarctic Circumpolar Current (ACC),together with evidence for northward advection of the Cd signal in the ACC, demonstrate that Cd isotopes trace surface ocean circulation regimes. The relationships between Cd isotope ratios and concentrations display two negative correlations, separating the ACC and Weddell Gyre into two distinct Cd isoscapes. These arrays are consistent with Rayleigh fractionation and imply a doubling of the isotope effect due to biological consumption of Cd during water transport from the Weddell Gyre into the ACC. The increase in magnitude of Cd isotope fractionation can be accounted for by differences in the phytoplankton biomass, community composition, and their physiological uptake mechanisms in the Weddell Gyre and ACC, thus linking Cd isotope fractionation to primary production and the global carbon cycle.
Project(s):
Coverage:
Median Latitude: -54.768647 * Median Longitude: 0.875278 * South-bound Latitude: -67.000700 * West-bound Longitude: -1.399400 * North-bound Latitude: -42.338900 * East-bound Longitude: 8.993400
Date/Time Start: 2008-02-13T17:17:00 * Date/Time End: 2008-03-09T15:25:00
Minimum DEPTH, water: 3.5 m * Maximum DEPTH, water: 24.8 m
Event(s):
PS71/101-2 * Latitude: -42.338900 * Longitude: 8.993400 * Date/Time: 2008-02-13T17:17:00 * Elevation: -4546.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS71/103-1 * Latitude: -45.999500 * Longitude: 5.881200 * Date/Time: 2008-02-16T02:38:00 * Elevation: -3330.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS71/104-2 * Latitude: -47.671800 * Longitude: 4.289300 * Date/Time: 2008-02-17T00:03:00 * Elevation: -4546.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | Area/locality | Area | Abouchami, Wafa | |||
| 6 | Method comment | Method comm | Abouchami, Wafa | |||
| 7 | DEPTH, water | Depth water | m | Geocode | ||
| 8 | Depth, top/min | Depth top | m | Abouchami, Wafa | ||
| 9 | Depth, bottom/max | Depth bot | m | Abouchami, Wafa | ||
| 10 | Salinity | Sal | Abouchami, Wafa | per mil | ||
| 11 | Temperature, water | Temp | °C | Abouchami, Wafa | ||
| 12 | Phosphate | [PO4]3- | µmol/kg | Abouchami, Wafa | ||
| 13 | Silicon | Si | mmol/kg | Abouchami, Wafa | ||
| 14 | Nitrogen oxide | NOx | µmol/kg | Abouchami, Wafa | ||
| 15 | Nitrite | [NO2]- | µmol/kg | Abouchami, Wafa | ||
| 16 | Nitrate | [NO3]- | µmol/kg | Abouchami, Wafa | ||
| 17 | Cadmium | Cd | nmol/kg | Abouchami, Wafa | ||
| 18 | Cadmium-110/Cadmium-112 ratio | 110Cd/112Cd | Abouchami, Wafa | Thermal Ionization Mass Spectrometry (TIMS) | ||
| 19 | Cadmium-110/Cadmium-112, error | 110Cd/112Cd e | ± | Abouchami, Wafa | Thermal Ionization Mass Spectrometry (TIMS) | |
| 20 | Ratio | Ratio | Abouchami, Wafa | epsilon 112Cd/110Cd, rel. to JMC-Mainz inhouse standard | ||
| 21 | Ratio | Ratio | Abouchami, Wafa | epsilon 112Cd/110Cd, rel. to NIST SRM-3108 standard | ||
| 22 | Standard deviation | Std dev | ± | Abouchami, Wafa | 2 sigma | |
| 23 | Ratio | Ratio | Abouchami, Wafa | Cd/PO4 | ||
| 24 | Ratio | Ratio | Abouchami, Wafa | NO3/Cd | ||
| 25 | Ratio | Ratio | Abouchami, Wafa | NO3/PO4 | ||
| 26 | Ratio | Ratio | Abouchami, Wafa | Si/Cd |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
412 data points