Abstract Title

Session S-02A: Future Salish Sea Water Quality

Keywords

Marine Water Quality

Start Date

1-5-2014 5:00 PM

End Date

1-5-2014 6:30 PM

Description

Dissolved oxygen in the Strait of Georgia has shown a trend towards declining concentrations since 1971. This poster will discuss the driving mechanism for this trend and asks the question; will the Strait of Georgia become increasingly hypoxic, and even anoxic, as a persistent condition? We consider budgets for anthropogenic inputs, and show that the mechanisms that drive oxygen states in the SoG are coming from offshore upwelled waters that enter via Haro Strait during late spring and summer and from remineralization/diffusive processes in the winter. Time series of dissolved oxygen, from monitoring programs will be presented and incorporated into a mixing model. Even taken into consideration the reduced oxygen solubility due to increases in temperature and its limited overall circulation, models show that even if upwelled waters become anoxic, the Strait of Georgia is unlikely to develop long-term hypoxic conditions. This is primarily due to a combination of vigorous mixing though Haro Strait and light-limited primary production.

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May 1st, 5:00 PM May 1st, 6:30 PM

Dissolved Oxygen in the Strait of Georgia: Why Mixing it up is Important

Room 6C

Dissolved oxygen in the Strait of Georgia has shown a trend towards declining concentrations since 1971. This poster will discuss the driving mechanism for this trend and asks the question; will the Strait of Georgia become increasingly hypoxic, and even anoxic, as a persistent condition? We consider budgets for anthropogenic inputs, and show that the mechanisms that drive oxygen states in the SoG are coming from offshore upwelled waters that enter via Haro Strait during late spring and summer and from remineralization/diffusive processes in the winter. Time series of dissolved oxygen, from monitoring programs will be presented and incorporated into a mixing model. Even taken into consideration the reduced oxygen solubility due to increases in temperature and its limited overall circulation, models show that even if upwelled waters become anoxic, the Strait of Georgia is unlikely to develop long-term hypoxic conditions. This is primarily due to a combination of vigorous mixing though Haro Strait and light-limited primary production.