Dataset: CliOMZ Nutrient profile data

Water samples were collected during cruises  RR2104 and AT50-10 in the eastern tropical and subtropical Pacific Ocean. Discrete water samples were obtained using a CTD rosette sampler equipped with 24 x 10 L Niskin bottles. Different depths were sampled ranging from 10 meters to 2200 meters.

Ammonium concentrations were measured on board from unfiltered 40 mL seawater samples using the o-phthaldialdehyde derivatization method with modifications as suggested in (Taylor et al. 2007) on an Aquafluor 8000 handheld fluorometer. Samples for nitrite and nitrate concentration measurements were syringe-filtered (0.22 µm, Sterivex) and stored at −20°C before concentrations were determined by Cd reduction coupled to colorimetric detection via the Griess assay on a Lachat autoanalyzer.