Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 7677
Type of Book: Technical
Section or Chapter Title: Hydrography and zooplankton off the central Oregon coast during the 1997–1998 El Niño event
Book Title: Climate change and salmon production
Author: William T. Peterson, Michael H. Schiewe, Edmundo Casillas, Robert L. Emmett, K. C. Jacobson
Editor: Katherine Myers (Ed.)
Publication Year: 1998
Publisher: North Pacific Anadromous Fish Commission Technical Report No. 1
Pages: 32-34

Monitoring of hydrography and zooplankton at stations 2, 5, 9, 18 and 28 km off Newport, Oregon was initiated in May of 1996.  The purpose of this effort was to compare present ocean conditions to conditions observed in the 1970s at these same stations.  Sampling is conducted at fortnightly intervals.  This paper describes conditions that prevailed during the summer of 1997.  Given that upwelling was weak during the summer of 1997 and that the copepod species captured in shelf waters were a mixture of shelf species and species with offshore affinities, it is suggested that the warming in 1997 was due solely to onshore advection of warm offshore waters.  Sampling completed on 5 March 1998 showed that zooplankton species with southern affinities dominated the shelf waters.  Sampling on 18 March 1998 revealed that the zooplankton was dominated by the usual neritic coastal cool water species suggesting that the El Niño has abated and that an early spring transition may occur this year. 

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