Nutrient concentrations along a North-South transect in the North Atlantic measured during Maria S. Merain cruise MSM03/1 (VISION) cruise

Samples were taken along a transect in the North Atlantic Ocean from 66°139.27'N; 29°136.65'W to 34°124.87'N; 28°128.90'W during the VISION cruise (diVersIty, Structure and functION) MSM03/01 on board the research vessel Maria S. Merian from September 21 to September 30, 2006. Along this transect, each station was sampled at 12 depths, from 10m down to 250m or 500m. Samples were collected with a rosette of 20-l Niskin bottles mounted on a conductivity-temperature-density profiler. Water samples for nutrients analysis were filtered directly after sampling through 0.45-µm in-line filters attached to a 60-ml pre-cleaned syringe into two 12-ml polystyrole tubes. Samples were stored at 4°C (dissolved silicate) or 80°C (ammonium, phosphate, nitrate and nitrite) The samples were spectrophotometrically measured with a continuous-flow analyzer using standard AA3 methods (Seal Analytical, Norderstedt, Germany) using a variant of the method of Grasshoff et al. (1983).

Pore water geochemistry of ODP Hole 169-1037B and Site 196-1038

Data were presented to compare pore fluids from Sites 1037 and 1038 in the Escanaba Trough, Gorda Ridge. Site 1037 constitutes the reference site, and Site 1038 is the hydrothermally affected site. The program was undertaken for two purposes: (1) to make a detailed analysis of the halide chemistry of these two sites, with the specific aim of discerning any potential differences in the generation of dissolved halides as a result of sediment diagenesis in these drill sites and (2) to investigate the geochemistry of Ba2+ and Mn2+ at these two sites to discover potential hydrothermal effects reflected in the concentration-depth distributions of these elements.