Concentrations of total organic carbon on vertical profiles in waters of the Weddell Sea measured on water bottle sample during POLARSTERN cruise ANT-X/6 ...

• Main Authors: Kähler, Paul, Bjørnsen, Peter K, Lochte, Karin, Antia, Avan N
• Format: Dataset
• Language: English
• Published: PANGAEA 2008
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; DEPTH, water; Carbon, organic, total; CTD/Rosette; ANT-X/6; Polarstern; Antarc*; Antarctic; Sea ice; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.696180; https://doi.pangaea.de/10.1594/PANGAEA.696180

Concentrations of dissolved organic carbon (DOC) and nitrogen (DON) were measured during early austral Spring 1992 at a number of stations along the 6°W meridian between 47° and 60°S. This included the Polar Front in the north, the zone of melting sea-ice in the south, and waters of the Antarctic Circumpolar Current in between. Concentrations of DOC were low in deep water (34–38 ?M) with generally similar or slightly higher values in the surface mixed layer (38–55 ?M). DOC:DON ratios are wider in surface water than in deep water, i.e. surface accumulations contain relatively C-rich dissolved organic matter. The highly variable distribution of the surface DOC was not related to hydrographic or biotic features (fronts, plankton development) indicating the lability and transient occurrence of this material.Growth rates of bacteria were determined in subsamples from 51 0.8-?m-filtered batches of seawater incubated in the dark at in-situ temperature. Thymidine and leucine uptake and bacterial biomass change as ... : Not filtered water samples were taken in 10 ml ampoules (sealed immediately after being acidified with phosphoric acid to pH<2, sampling), or 40 ml screw-lid vials, and measured on board the ship at the day of sampling or at the next day, or conserved frozen (-20°C) until being acidified and measured in home labs.Measurement was by high-temperature catalytic oxidation in a 10 cm column packed with 5% Pt on aluminum oxide beads at 900°C in a stream of oxygen, and CO2 detection by infrared extinction after the removal of moisture and SO2 by appropriate traps (cold trap, Mg-percarbonate, Na-pyrophosphate, tin, bronze or Sulfix). The apparatus was the dual channel Dimatek 2000 equipped with a Binos 200 detector. ...