Middag, Rob; de Baar, Hein J W; Laan, Patrick; Cai, P H; van Ooijen, Jan C (2011): (Figure 2) Dissolved manganese concentrations during POLARSTERN Cruise ANT-XXIV/3 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.816962, Supplement to: Middag, R et al. (2011): Dissolved manganese in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2661-2677, https://doi.org/10.1016/j.dsr2.2010.10.043
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Abstract:
The first comprehensive dataset (492 samples) of dissolved Mn in the Southern Ocean shows extremely low values of 0.04 up to 0.64 nM in the surface waters and a subsurface maximum with an average concentration of 0.31 nM (n=20; S.D.=0.08 nM). The low Mn in surface waters correlates well with the nutrients PO4 and NO3 and moderately well with Si(OH)4 and fluorescence. Furthermore, elevated concentrations of Mn in the surface layer coincide with elevated Fe and light transmission and decreased export (234Th/238U deficiency) and fluorescence. It appears that Mn is a factor of importance in partly explaining the HNLC conditions in the Southern Ocean, in conjunction with significant controls by the combination of Fe limitation and light limitation. No input of Mn from the continental margins was observed. This is ascribed to the protruding continental ice sheet that covers the shelf and shuts down the usual biological production, microbial breakdown and sedimentary geochemical cycling. The low concentrations of Mn in the deep ocean basins (0.07-0.23 nM) were quite uniform, but some elevations were observed. The highest deep concentrations of Mn were observed at the Bouvet Triple Junction region and coincided with high concentrations of Fe and are deemed to be from hydrothermal input. The deep basins on both sides of the ridge were affected by this input. In the deep Weddell Basin the input of Weddell Sea Bottom Water appears to be the source of the slightly elevated concentrations of Mn in this water layer.
Further details:
Middag, Rob; van Slooten, C; de Baar, Hein J W; Laan, Patrick (2011): Dissolved aluminium in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2647-2660, https://doi.org/10.1016/j.dsr2.2011.03.001
Project(s):
Coverage:
Median Latitude: -58.550186 * Median Longitude: 0.938073 * South-bound Latitude: -69.400500 * West-bound Longitude: -0.009700 * North-bound Latitude: -42.338900 * East-bound Longitude: 8.993400
Date/Time Start: 2008-02-13T18:55:00 * Date/Time End: 2008-03-12T04:22:00
Minimum DEPTH, water: 3.6 m * Maximum DEPTH, water: 5320.7 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 was taken from the supplementary table in Middag et al. (2011b). 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 | DATE/TIME | Date/Time | Geocode | |||
| 5 | Elevation of event | Elevation | m | |||
| 6 | DEPTH, water | Depth water | m | Geocode | ||
| 7 | Bottle number | Bottle | Middag, Rob | |||
| 8 | Manganese, dissolved | Mn diss | nmol/l | Middag, Rob | ||
| 9 | Quality flag | QF | Middag, Rob | 4 = suspect | ||
| 10 | Manganese, standard deviation | Mn std dev | ± | Middag, Rob |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1980 data points