Transport of plankton and particles between the Chukchi and Beaufort Seas during summer 2002, described using a Video Plankton Recorder

摘要: Abstract A key goal of the Western Arctic Shelf Basin Interactions program is to understand how physical and biological processes together impact shelf–basin exchange biological, chemical, properties. High-resolution vertical distributions plankton particles were obtained using an Auto Video Plankton Recorder from 29 locations on Chukchi Shelf, in deep Beaufort Sea, across Beaufort–Chukchi Shelf-break during a cruise USCGC Healy July–August, 2002. Coincident velocity estimates collected hull-mounted acoustic Doppler current profilers. Images extracted automatically identified manually taxa type. Copepods, diatom chains, decaying diatoms, marine snow, radiolarians most abundant categories observed. Distinct regional differences abundance observed that associated with different oceanographic regimes prevailing circulation region. Vertical closely structure water column. sharp horizontal discontinuity all between shelf basin was observed, located over break potentially established maintained by transport along-shelf east rather than northwards towards basin. Barrow Canyon shelf-break had very high concentrations particles, especially may have resulted elevated production eastern subsequently advected out east. Comparisons downward flux, estimated particle sinking rates based individual snow size, velocities suggested much carbon benthos Sea prior being off-shelf. Velocities indicated little off-shelf flux or occurring except eddy off Shelf.