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Anomalous Near-Surface Low-Salinity Pulses off the Central Oregon Coast

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  • From mid-May to August 2011, extreme runoff in the Columbia River ranged from 14,000 to over 17,000 m³/s, more than two standard deviations above the mean for this period. The extreme runoff was the direct result of both melting of anomalously high snowpack and rainfall associated with the 2010–2011 La Niña. The effects of this increased freshwater discharge were observed off Newport, Oregon, 180 km south of the Columbia River mouth. Salinity values as low as 22, nine standard deviations below the climatological value for this period, were registered at the mid-shelf. Using a network of ocean observing sensors and platforms, it was possible to capture the onshore advection of the Columbia River plume from the mid-shelf, 20 km offshore, to the coast and eventually into Yaquina Bay (Newport) during a sustained wind reversal event. Increased freshwater delivery can influence coastal ocean ecosystems and delivery of offshore, river-influenced water may influence estuarine biogeochemistry.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Nature Publishing Group. The published article can be found at: www.nature.com/articles/srep17145
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  • Mazzini, P. L., Risien, C. M., Barth, J. A., Pierce, S. D., Erofeev, A., Dever, E. P., ... & Vardaro, M. F. (2015). Anomalous Near-Surface Low-Salinity Pulses off the Central Oregon Coast. Mazzini, P. L., Risien, C. M., Barth, J. A., Pierce, S. D., Erofeev, A., Dever, E. P., ... & Vardaro, M. F. (2015). Anomalous Near-Surface Low-Salinity Pulses off the Central Oregon Coast. Scientific Reports, 5, 17145. doi:10.1038/srep17145, 5, 17145. doi:10.1038/srep17145
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  • 5
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  • This work was supported by a Brazil-U.S. CAPES/Fulbright scholarship to Piero Luigi Fernandes Mazzini. Additional support was provided by the U.S. National Science Foundation grants OCE-0851486 and OCE-0961999. The OOI is funded by the National Science Foundation and managed by the Consortium for Ocean Leadership.
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