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River influences on shelf ecosystems: Introduction and synthesis

ScholarsArchive at Oregon State University

Field Value
Title River influences on shelf ecosystems: Introduction and synthesis
Names Hickey, B. M. (creator)
Kudela, R. M. (creator)
Nash, Jonathan (creator)
Bruland, K. W. (creator)
Peterson, W. T. (creator)
MacCready, P. (creator)
Lessard, E. J. (creator)
Jay, D. A. (creator)
Banas, N. S. (creator)
Baptista, A. M. (creator)
Dever, Edward P. (creator)
Kosro, P. Michael (creator)
Kilcher, L. K. (creator)
Homer-Devine, A. R. (creator)
Zaron, E. D. (creator)
McCabe, R. M. (creator)
Peterson, J. O. (creator)
Orton, P. <. (creator)
Pan, J. (creator)
Lohan, M. C. (creator)
Date Issued 2010-02-03 (iso8601)
Note Copyrighted by American Geophysical Union.
Abstract River Influences on Shelf Ecosystems (RISE) is the first comprehensive
interdisciplinary study of the rates and dynamics governing the mixing of river and coastal
waters in an eastern boundary current system, as well as the effects of the resultant plume
on phytoplankton standing stocks, growth and grazing rates, and community structure.
The RISE Special Volume presents results deduced from four field studies and two
different numerical model applications, including an ecosystem model, on the buoyant
plume originating from the Columbia River. This introductory paper provides background
information on variability during RISE field efforts as well as a synthesis of results, with
particular attention to the questions and hypotheses that motivated this research. RISE
studies have shown that the maximum mixing of Columbia River and ocean water occurs
primarily near plume liftoff inside the estuary and in the near field of the plume. Most
plume nitrate originates from upwelled shelf water, and plume phytoplankton species are
typically the same as those found in the adjacent coastal ocean. River-supplied nitrate
can help maintain the ecosystem during periods of delayed upwelling. The plume inhibits
iron limitation, but nitrate limitation is observed in aging plumes. The plume also has
significant effects on rates of primary productivity and growth (higher in new plume
water) and microzooplankton grazing (lower in the plume near field and north of the
river mouth); macrozooplankton concentration (enhanced at plume fronts); offshelf
chlorophyll export; as well as the development of a chlorophyll “shadow zone” off
northern Oregon.
Genre Article
Topic Columbia River plume
Identifier Hickey, B. M., et al. (2010), River Influences on Shelf Ecosystems: Introduction and synthesis, J. Geophys. Res., 115, C00B17.

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