Instrument: Niskin bottle
A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.
Water samples from Niskin bottles were filtered through 0.2 µm pore-size PES membrane filter and stored frozen in acid-washed 60 mL HDPE bottles.