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  • 2020-2024  (1)
  • 2005-2009  (1)
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  • 1
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    Unknown
    Concentrations of macronutrients, dissolved organic and inorganic compounds during the iron fertilization experiment EIFEX in 2004 (2023)
    PANGAEA
    Details
    Publication Date: 2024-05-11
    Description: Here we present the concentrations of inorganic nutrients, dissolved organic carbon, nitrogen and phophorus and dissolved inorganic carbon (DIC) from discrete water samples collected with a CTD-rosette during the European Iron Fertilization Experiment (EIFEX). The experiment was carried out from February 11 to March 20, 2004 in the 60-km diameter, rotating core of an eddy, formed by a meander of the Antarctic Polar Front (centred at around 49°10' S and 2°10' E). Samples were taken within the eddy inside and outside the fertilized patch, and in a few cases outside the eddy. Inorganic nutrients (silicate, phosphate, nitrate, nitrite and ammonium) were measured with a Technicon Autoanalyser II system using standard methods. Dissolved organic carbon (DOC) was determined by high temperature combustion using a TOC-VCPH/CPN (Shimadzu) according to Skoog et al. (1997). Dissolved organic nitrogen (DON) was measured on an Evolution continuous flow analyser (Alliance Instruments) after Valderrama (1981). Dissolved inorganic carbon was measured by coulometric titration (Johnson et al., 1987) using a SOMMA system with gas loop calibration with a reproducibility of 2 mmol/kg. DIC was calibrated against certified reference materials from Andrew Dickson at Scripps Institution of Oceanography (SIO).
    Keywords: Ammonium; ANT XXI/3; ANT-XXI/3; Auto-analyzer II, Technicon; Carbon, inorganic, dissolved; Carbon, organic, dissolved; Cast number; Continuous flow analyser, Alliance Instruments, Evolution; Method according to Valderrama (1981); Coulometric titration according to Johnson et al. (1987); CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; dissolved in organic carbon (DIC); Dissolved Organic Matter; Duration, number of days; Event label; GOFLO; Go-Flo bottles; LATITUDE; LONGITUDE; Nitrate; Nitrite; Nitrogen, organic, dissolved; particulate organic matter; Phosphate; Polarstern; Position; PS65/424-3; PS65/424-8; PS65/426-1; PS65/427-1; PS65/452-1; PS65/464-1; PS65/466-2; PS65/470-1; PS65/471-1; PS65/508-16; PS65/508-2; PS65/509-1; PS65/509-13; PS65/511-1; PS65/511-9; PS65/513-3; PS65/513-5; PS65/514-2; PS65/514-6; PS65/515-1; PS65/516-1; PS65/517-1; PS65/518-1; PS65/519-1; PS65/520-1; PS65/521-1; PS65/522-1; PS65/523-1; PS65/524-1; PS65/525-1; PS65/526-1; PS65/527-1; PS65/528-1; PS65/529-1; PS65/530-1; PS65/531-1; PS65/532-1; PS65/533-1; PS65/534-1; PS65/535-1; PS65/536-1; PS65/537-1; PS65/538-1; PS65/539-1; PS65/540-1; PS65/541-1; PS65/543-10; PS65/543-14; PS65/543-15; PS65/543-8; PS65/544-11; PS65/544-14; PS65/544-18; PS65/544-24; PS65/544-29; PS65/544-35; PS65/544-42; PS65/544-48; PS65/544-5; PS65/544-53; PS65/544-56; PS65/544-60; PS65/544-63; PS65/544-7; PS65/544-9; PS65/545-1; PS65/546-14; PS65/546-2; PS65/546-5; PS65/553-10; PS65/553-3; PS65/553-5; PS65/559-1; PS65/570-11; PS65/570-2; PS65/570-4; PS65/570-7; PS65/572-1; PS65/573-1; PS65/574-1; PS65/580-10; PS65/580-2; PS65/580-4; PS65/580-6; PS65/581-1; PS65/583-1; PS65/584-1; PS65/585-1; PS65/587-1; PS65/587-10; PS65/587-3; PS65/588-1; PS65/591-1; PS65/591-3; PS65/592-1; PS65/593-12; PS65/593-3; PS65/593-6; PS65 EIFEX; Silicate; South Atlantic Ocean; Station label; Total organic carbon analyzer, Schimadzu, TOC-VCPH/CPN; HTCO method according to Skoog et al. (1997)
    Type: Dataset
    Format: text/tab-separated-values, 9707 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Nitrous oxide measurements during EIFEX, the European Iron Fertilization Experiment in the subpolar South Atlantic Ocean (2005)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 32 (23). L23613.
    Details
    Publication Date: 2019-09-23
    Description: We measured the vertical water column distribution of nitrous oxide (N2O) during the European Iron Fertilization Experiment (EIFEX) in the subpolar South Atlantic Ocean during February/March 2004 (R/V Polarstern cruise ANT XXI/3). Despite a huge build‐up and sedimentation of a phytoplankton bloom, a comparison of the N2O concentrations within the fertilized patch with concentrations measured outside the fertilized patch revealed no N2O accumulation within 33 days. This is in contrast to a previous study in the Southern Ocean, where enhanced N2O accumulation occurred in the pycnocline. Thus, we conclude that Fe fertilization does not necessarily trigger additional N2O formation and we caution that a predicted radiative offset due to a Fe‐induced additional release of oceanic N2O might be overestimated. Rapid sedimentation events during EIFEX might have hindered the build‐up of N2O and suggest, that not only the production of phytoplankton biomass but also its pathway in the water column needs to be considered if N2O radiative offset is modeled.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2005GL024619
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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