Temporal variability of near-bottom dissolved oxygen during upwelling off central Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/articles/rn3016411

This is the publisher’s pdf. The article is copyrighted by the American Geophysical Union and published by John Wiley & Sons, Inc. It can be found at:  http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2169-9291.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • In the productive central-Oregon coastal upwelling environment, wind-driven upwelling, tides, and topographic effects vary across the shelf, setting the stage for varied biogeochemical responses to physical drivers. Current, temperature, salinity, and dissolved oxygen (DO) measurements from three moorings deployed during the upwelling seasons of 2009–2011 off the central-Oregon coast are analyzed over three time bands (interannual, subtidal, tidal) to explore the relationship between mid (70 m) and inner-shelf (15 m) upwelling dynamics and the associated effect on DO. Topographic effects are observed in each time band due to the Heceta and Stonewall Bank complex. Seasonal cumulative hypoxia (DO < 1.4 mL L⁻¹) calculations identify two regions, a well-ventilated inner shelf and a midshelf vulnerable to hypoxia (98 ± 15 days annually). On tidal timescales, along-shelf diurnal (K1) velocities are intensified over the Bank, 0.08 m s⁻¹ compared with 0.03 m s⁻¹ to the north. Interannual variability in the timing of spring and fall transitions, defined using glider-measured continental slope source water temperature, is observed on the midshelf. Interannual source water DO concentrations vary on the order of 0.1 mL L⁻¹. Each spring and summer, DO decline rates are modulated by physical and biological processes. The net observed decrease is about 30% of the expected draw down due to water-column respiration. Physical processes initiate low-oxygen conditions on the shelf through coastal upwelling and subsequently prevent the system via advection and mixing from reaching the potential anoxic levels anticipated from respiration rates alone.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Adams, K. A., J. A. Barth, and F. Chan (2013), Temporal variability of near-bottom dissolved oxygen during upwelling off central Oregon, Journal of Geophysical Research: Oceans, 118, doi:10.1002/jgrc.20361.
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces

Relationships

In Administrative Set:
Last modified: 12/11/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items