Abstract:
Conventional "spot" sampling of patchy distributions of oceanic constituents can lead to sampling errors. Interpretation of results
based on data of disparate temporal or spatial resolution can be difficult or impossible. Ths report discusses the design and
performance of two water sampling devices which attempt to minimize these problems. The devices were created for open ocean
tracer release experiments, but can be used for other experiments where inhomogeneity is anticipated. The first sampler is a
mechancally-operated, variable-rate integrating water sampler which acquires a time-averaged sample. The sampler incorporates
featues of both the spring-driven and the hydraulically-driven samplers described by Ledwell et al., 1991. The second sampler is a
multichamber sampling system incorporating a battery powered pump and valve system made by McLane Research, Inc., of
Falmouth, Massachusett. The system consists of a micro-gear pump, a 50-port valve with programmable controller, and
carousels contaning fifty glass sampling syringes. It can be programmed to sample on a variety of schedules allowing the user
flexibilty in the field to adapt to changing requirements. A general description, operational instructions, and performance analysis
are provided for each sampler system.
