Rosette sampler, Niskin

In light of the above data, use of the pump system was discontinued, and a Niskin Rosette sampler (Figure 3) was used to perform a com-... 

Comparison of commercially available rosette samplers (Table 1-2, Fig. 1-5) shows that different constructions follow almost the same principle. A circular protective frame accommodates 3-36 samplers which commonly can be used as serial samplers in hydrocasts. In addition to their usage in basic hydrochemical studies, standard rosette samplers (e.g., 12 L Niskin samplers see Table 1-2) are also suitable for the collection of oceanographic tracers such as fluorocarbon compounds, helium-3, tritium or even carbon-14 (except for studies in the deep waters of the Pacific and Indian Oceans, where large special samplers of > 250 L volume are needed see Table 1-2 and Oiapter 13). 

Station salinity samples for analysis with a salinometer are taken from water samplers that are closed at desired depths or pressures. In many cases, a rosette sampler is used that carries Niskin or comparable water sampling bottles (see Chapter 1). Ihe bottles are mounted in one or more rings on a frame. Closing the bottles at desired pressure levels is triggered from the deck unit in the ship s laboratory. New s tems allow selection of bottles individually and not just in the order of their position on the frame. Most frequently, and necessary for WOCE standards, the rosette sampler is operated together with a CTD that is mounted on the rosette s frame. The CTD s on-line pressure information is then used for controlled closing of the water samplers. 

Syiplinq, Discrete water column samples were obtained with 5-L Niskin bottles attached to a General Oceanics Rosette fitted with Plessey Environmental Systems model 9040 CTD. A 1-L aliquot of seawater was transferred from the Niskin samplers into glass-stoppered bottles in such a way that air bubbles were not trapped. The bottles were then stored in the dark at... 

Niskin 1010 PVC tube. Teflon coating optional, internal rubber spring, for single use and in rosette-type samplers, reduced flushing 1.2-30 2-12.7 ul Std., (TM) GO... 

Deadweight in air (kg) in parantheses limited suitability intelligent rosette multi-bottle water sampling system small volume sampler FSl SURE-FIRE submersible array Niskin non-metallic convertible surface water sampling bottles. 

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