Construction of Parflux Mark II sediment trap : engineering report
Citable URI
https://hdl.handle.net/1912/10352DOI
10.1575/1912/10352Abstract
A large, open ocean applicable sediment trap has been
developed at the Woods Hole Oceanographic Institution in order
to assess the fluxes of particles sinking through the deep
water column, under the sponsorship of the National Science
Foundation. PARFLUX Mark II trap, 1978-79 version for PARFLUX
phase 1 program, has been successfully developed and has
gathered much meaningful data. A trap opening is 1.5 m2 and
consists of 94 hexagonal buffer cells with the nominal form
ratio of 2. Sediment particles are concentrated to the
receiving cup located at the bottom of the funnel-shaped trap.
Two types of receiving cups have been developed; a trap with
Type S cup is open at both ends as it sinks to the designated
depth. Twenty-four hours after the deployment the receiving
cup moves into alignment with the funnel to store the
sediment. At the end of deployment a spring mechanism
activated by a quartz oscillator based electrical timer-release
retracts the receiving cup, seals the collected sample and
leave the funnel open at both ends while the trap ascends for
recovery. Type C mechanism is installed with a shutter which
seals the cup during recovery; this type involves a simple
mechanism with less moving parts. Sodium azide/sodium chloride
solution is diffused through a series of membrane filters to
keep the cup contents in an aseptic condition. Since October
1976 to December 1979, we have deployed and recovered 24 traps
successfully along with several moorings as deep as 5,600 m for
as long as 112 days. This reports the engineering detail and
lists the required parts to assist the construction, operation
and maintenance of the PARFLUX Mark II sediment trap.
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Suggested Citation
Honjo, S., & Connell, J. F. (1979). Construction of Parflux Mark II sediment trap: engineering report. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10352Related items
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