Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest

Kristen A. Davis, Neil S. Banas, Sarah N. Giddings, Samantha A. Siedlecki, Parker Maccready, Evelyn J. Lessard, Raphael M. Kudela, Barbara M. Hickey

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The Pacific Northwest (PNW) shelf is the most biologically productive region in the California Current System. A coupled physical-biogeochemical model is used to investigate the influence of freshwater inputs on the productivity of PNW shelf waters using realistic hindcasts and model experiments that omit outflow from the Columbia River and Strait of Juan de Fuca (outlet for the Salish Sea estuary). Outflow from the Strait represents a critical source of nitrogen to the PNW shelf-accounting for almost half of the primary productivity on the Vancouver Island shelf, a third of productivity on the Washington shelf, and a fifth of productivity on the Oregon shelf during the upwelling season. The Columbia River has regional effects on the redistribution of phytoplankton, but does not affect PNW productivity as strongly as does the Salish Sea. A regional nutrient budget shows that nitrogen exiting the Strait is almost entirely (98%) of ocean-origin - upwelled into the Strait at depth, mixed into surface waters by tidal mixing, and returned to the coastal ocean. From the standpoint of nitrogen availability in the coastal euphotic zone, the estuarine circulation driven by freshwater inputs to the Salish Sea is more important than the supply of terrigenous nitrogen by rivers. Nitrogen-rich surface waters exiting the Strait follow two primary pathways - to the northwest in the Vancouver Island Coastal Current and southward toward the Washington and Oregon shelves. Nitrogen flux from the Juan de Fuca Strait and Eddy Region to these shelves is comparable to flux from local wind-driven upwelling.

LanguageEnglish
Pages8778-8799
Number of pages22
JournalJournal of Geophysical Research: Oceans
Volume119
Issue number12
Early online date22 Dec 2014
DOIs
Publication statusPublished - 20 Jan 2015

Fingerprint

Pacific Northwest (US)
estuaries
nutrients
upwelling water
Estuaries
productivity
shelves
Nutrients
straits
strait
upwelling
Nitrogen
Productivity
estuary
nutrient
nitrogen
freshwater input
Columbia River
Rivers
rivers

Keywords

  • Columbia River
  • estuarine circulation
  • nitrogen
  • Pacific Northwest
  • primary productivity
  • Strait of Juan de Fuca

Cite this

Davis, K. A., Banas, N. S., Giddings, S. N., Siedlecki, S. A., Maccready, P., Lessard, E. J., ... Hickey, B. M. (2015). Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest. Journal of Geophysical Research: Oceans, 119(12), 8778-8799. https://doi.org/10.1002/2014JC010248
Davis, Kristen A. ; Banas, Neil S. ; Giddings, Sarah N. ; Siedlecki, Samantha A. ; Maccready, Parker ; Lessard, Evelyn J. ; Kudela, Raphael M. ; Hickey, Barbara M. / Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest. In: Journal of Geophysical Research: Oceans. 2015 ; Vol. 119, No. 12. pp. 8778-8799.
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Davis, KA, Banas, NS, Giddings, SN, Siedlecki, SA, Maccready, P, Lessard, EJ, Kudela, RM & Hickey, BM 2015, 'Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest' Journal of Geophysical Research: Oceans, vol. 119, no. 12, pp. 8778-8799. https://doi.org/10.1002/2014JC010248

Estuary-enhanced upwelling of marine nutrients fuels coastal productivity in the U.S. Pacific Northwest. / Davis, Kristen A.; Banas, Neil S.; Giddings, Sarah N.; Siedlecki, Samantha A.; Maccready, Parker; Lessard, Evelyn J.; Kudela, Raphael M.; Hickey, Barbara M.

In: Journal of Geophysical Research: Oceans, Vol. 119, No. 12, 20.01.2015, p. 8778-8799.

Research output: Contribution to journalArticle

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