WHOI biogeochemist Ken Buesseler (blue hat) and engineer Jim Valdes (yellow hat) deploy a Neutrally Buoyant Sediment Trap for a three-day mission in the depths of the North Pacific Ocean in 2005. The instrument collects ?marine snow,? the falling particles of dead phytoplankton and zooplankton feces that sink from sunlit waters into the ocean?s ?twilight zone.? (Photo by Mark Gall, National Institute of Water and Atmospheric Research, New Zealand)[back]
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