Publication Date:
2024-05-11
Description:
Here we present concentrations of chlorophyll a, phaeopigments, particulate organic carbon and nitrogen from water samples collected at discrete depths 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.Chlorophyll concentrations were determined by fluorometry using a Turner Design Model 10-AU digital fluorometer. Sampling, measurements and calibration of the fluorometer was carried out following the JGOFS protocol procedure (Knap et al, 1996). Results of the fluorometer calibration diverged by 5% between beginning and end of the cruise. Chlorophyll a content was calculated using average parameter values from the two calibrations. Measurement uncertainty was estimated from triplicate water samples taken from depths ranging between 10 and 100 m depth and averaged 5% of measured values. Samples for particulate organic carbon and nitrogen (POC and PON) were filtered onto precombusted Whatman GF/F filters and processed following recommendations by Lorrain et al. (2003). Samples were measured independently on three different analysers: a CN2500 CHN Analyser (Thermo Finnigan MAT) coupled to a Delta+ mass spectrometer (Thermo Finnigan MAT) via Conflo II interface (Thermo Finnigan MAT), a Carlo-Erba NA-1500 Series II elemental analyzer coupled to a Finnegan Delta+ mass spectrometer and a Euro EA Elemental Analyser. Differences due to methods were within the range of measurement variability (below 2%). The particulate organic phosphorus (POP) content was determined colorimetrically using the method from Hansen and Koroleff (1999; measurement variability 4%). Biogenic silica (BSi) was measured following the wet alkaline digestion method according to Müller and Schneider (1993; measurement variability 2%).
Keywords:
ANT XXI/3; ANT-XXI/3; Biogenic silica; Carbon, organic, particulate; Cast number; Chlorophyll a; Colorimetry according to Hansen and Koroleff (1999); CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; dissolved in organic carbon (DIC); Dissolved Organic Matter; Duration, number of days; Elemental analyzer; Decarbonation and preservation method according to Lorrain et al. (2003); Event label; Fluorometer, Turner Designs, 10-AU; According to Knap et al. (1996); LATITUDE; LONGITUDE; Nitrogen, organic, particulate; particulate organic matter; Phaeopigments; Phosphorus, organic, particulate; Polarstern; Position; PS65/424-3; PS65/426-1; PS65/427-1; PS65/452-1; PS65/464-1; PS65/466-2; PS65/470-1; PS65/474-1; PS65/508-2; PS65/509-1; PS65/511-1; PS65/513-3; PS65/514-2; PS65/515-1; PS65/516-1; 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; PS65/533-1; 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; PS65/544-11; PS65/544-14; PS65/544-15; PS65/544-18; PS65/544-20; PS65/544-24; PS65/544-26; PS65/544-29; PS65/544-3; PS65/544-32; PS65/544-35; PS65/544-42; PS65/544-48; PS65/544-5; PS65/544-53; PS65/544-56; PS65/544-7; PS65/544-9; PS65/545-1; PS65/546-2; PS65/553-3; PS65/555-1; PS65/556-1; PS65/557-1; PS65/558-1; PS65/559-1; PS65/560-2; PS65/561-1; PS65/562-2; PS65/563-1; PS65/564-1; PS65/565-1; PS65/570-4; PS65/572-1; PS65/573-1; PS65/580-2; PS65/581-1; PS65/586-3; PS65/587-1; PS65/588-1; PS65/591-1; PS65/592-1; PS65/593-3; PS65 EIFEX; South Atlantic Ocean; Station label; Wet alkaline digestion method according to Müller and Schneider (1993)
Type:
Dataset
Format:
text/tab-separated-values, 5554 data points
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