Sedwick, Peter; Marsay, Christopher M; Sohst, Bettina M; Aguilar-Islas, Ana M; Lohan, Maeve C; Long, Matthew C; Arrigo, Kevin R; Dunbar, Robert B; Saito, Mak A; Smith, Walker O Jr; DiTullio, Giacomo R (2011): (Table 1) Concentration of iron, DIP and silicic acid in water samples taken during Nathaniel B. Palmer cruises NBP06-01 and NBP06-08 (CORSACS I+II), Ross Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.836573, Supplement to: Sedwick, P et al. (2011): Early season depletion of dissolved iron in the Ross Sea polynya: Implications for iron dynamics on the Antarctic continental shelf. Journal of Geophysical Research, 116(C12), C12019, https://doi.org/10.1029/2010JC006553
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Abstract:
The Ross Sea polynya is among the most productive regions in the Southern Ocean and may constitute a significant oceanic CO2 sink. Based on results from several field studies, this region has been considered seasonally iron limited, whereby a "winter reserve" of dissolved iron (dFe) is progressively depleted during the growing season to low concentrations (~0.1 nM) that limit phytoplankton growth in the austral summer (December-February). Here we report new iron data for the Ross Sea polynya during austral summer 2005-2006 (27 December-22 January) and the following austral spring 2006 (16 November-3 December). The summer 2005-2006 data show generally low dFe concentrations in polynya surface waters (0.10 ± 0.05 nM in upper 40 m, n = 175), consistent with previous observations. Surprisingly, our spring 2006 data reveal similar low surface dFe concentrations in the polynya (0.06 ± 0.04 nM in upper 40 m, n = 69), in association with relatively high rates of primary production (~170-260 mmol C/m**2/d).
These results indicate that the winter reserve dFe may be consumed relatively early in the growing season, such that polynya surface waters can become "iron limited" as early as November; i.e., the seasonal depletion of dFe is not necessarily gradual. Satellite observations reveal significant biomass accumulation in the polynya during summer 2006-2007, implying significant sources of "new" dFe to surface waters during this period. Possible sources of this new dFe include episodic vertical exchange, lateral advection, aerosol input, and reductive dissolution of particulate iron.
Project(s):
Coverage:
Median Latitude: -76.001000 * Median Longitude: 177.340500 * South-bound Latitude: -78.650000 * West-bound Longitude: 164.990000 * North-bound Latitude: -65.210000 * East-bound Longitude: -164.710000
Date/Time Start: 2005-12-29T00:00:00 * Date/Time End: 2006-12-03T00:00:00
Minimum DEPTH, water: 6 m * Maximum DEPTH, water: 1265 m
Event(s):
NBP0601_NX1 (CORSACS-1_NX1) * Latitude: -77.670000 * Longitude: 179.940000 * Date/Time: 2005-12-29T00:00:00 * Location: Ross Sea * Campaign: NBP0601 (CORSACS I) * Basis: Nathaniel B. Palmer * Method/Device: Bottle, Niskin (NIS)
NBP0601_NX2 (CORSACS-1_NX2) * Latitude: -76.820000 * Longitude: 170.760000 * Date/Time: 2005-12-30T00:00:00 * Location: Ross Sea * Campaign: NBP0601 (CORSACS I) * Basis: Nathaniel B. Palmer * Method/Device: Bottle, Niskin (NIS)
NBP0601_NX3 (CORSACS-1_NX3) * Latitude: -76.490000 * Longitude: 166.330000 * Date/Time: 2006-01-01T00:00:00 * Location: Ross Sea * Campaign: NBP0601 (CORSACS I) * Basis: Nathaniel B. Palmer * Method/Device: Bottle, Niskin (NIS)
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 | Mixed layer depth | MLD | m | Sedwick, Peter | determined based on Delta sigma t = 0.05. | |
| 3 | DEPTH, water | Depth water | m | Geocode | ||
| 4 | Iron, dissolved | Fe diss | nmol/l | Sedwick, Peter | ||
| 5 | Iron, dissolvable | Fe dissolvable | nmol/l | Sedwick, Peter | TDFe | |
| 6 | Iron, particulate | Fe part | nmol/l | Sedwick, Peter | acid-labile particulate iron (ALPFe = TDFe - dFe) | |
| 7 | Nitrate and Nitrite | [NO3]- + [NO2]- | µmol/l | Sedwick, Peter | dissolved inorganic NO3+NO2 | |
| 8 | Phosphorus, inorganic, dissolved | DIP | µmol/l | Sedwick, Peter | ||
| 9 | Silicic acid | Si(OH)4 | µmol/l | Sedwick, Peter |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1365 data points