[스크랩] What is a sediment trap and why do we use it?

	Enlarge ImageThree sediment trap designs. The original funnel design uses a large collection area to sample marine snow that falls to great depths. Surface waters contain enough sediment that traps there don’t require funnels. Neutrally buoyant, drifting sediment traps catch falling material instead of letting it sweep past in the current. Drawings are not to scale.
	Enlarge ImageSediment traps are some of the biggest instruments used in ocean moorings. The funnel openings are made large to catch enough sediment for analyses. Here, Cynthia Pilskaln, of Bigelow Laboratory for Ocean Sciences, heads out on R/V Oceanus to deploy a trap. (Patrick Rowe, WHOI)
	Enlarge ImageDiagram of an automated time-series sediment trap used in the Arabian Sea. A baffle at top keeps out large objects that would clog the funnel. The circular tray holds collection vials. on a preprogrammed schedule (every 5 days to 1 month), the instrument seals one vial and rotates the next one into place. Scientist retrieve the samples up to a year later to analyze the collected sediment. (courtesy Oceanus magazine, WHOI)
	Enlarge ImageWHOI scientists Ken Buesseler and Jim Valdes with one of the neutrally buoyant sediment traps they helped design. The central cylinder controls buoyancy and houses a satellite transmitter. The other tubes collect sediment as the trap drifts in currents at a predetermined depth, then snap shut before the trap returns to the surface. (Tom Kleindinst, WHOI)
	Related Links
	» Catching the Rain: Sediment Trap Technology A primer on how sediment traps work, from Oceanus magazine » McLane Research Laboratories Technical details and diagrams about McLane's product line » Aquatic Research Instruments Technical details and diagrams of ARI's sediment traps » The Oceanic Flux Program Twenty years of particle flux measurements in the deep Sargasso Sea. From Oceanus magazine » Maureen Conte Dr. Conte, now at Bermuda Biological Station for Research, leads the Oceanic Flux Program (see above link)   참고 : http://www.whoi.edu/instruments/viewInstrument.do?id=10286

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