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How Connected Are The Strait of Georgia and Puget Sound Anyway?

How Connected Are The Strait of Georgia and Puget Sound Anyway?. Richard Dewey Ken Denman University of Victoria venus.uvic.ca. Nov 2012. Environmental Commonalities Geography Weather Oceanography Response Physical & Chemical (Habitat)  Biological (Ecology). The Salish Sea.

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How Connected Are The Strait of Georgia and Puget Sound Anyway?

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  1. How Connected Are TheStrait of GeorgiaandPuget Sound Anyway? Richard Dewey Ken Denman University of Victoria venus.uvic.ca Nov 2012

  2. Environmental • Commonalities • Geography • Weather • Oceanography • Response • Physical & Chemical (Habitat)  Biological • (Ecology)

  3. The Salish Sea The Environment: Geography - Straits & Islands, Mountains & Valleys - Rivers: Land to Sea - Juan de Fuca Strait: Ocean to Sea 2. Weather - Seasons - Heat, Precipitation, and Wind 3. Oceanography - Gradients: Salinity and Nutrients - Circulation: Tides and Upwelling 4. Response - When and Where

  4. Straits, Sound, Inlets, & Canals Islands Mountains Rivers

  5. Zonal Flows The low regions between mountain ridges force major storm winds to be along-strait, either W-E (JdF) or N-S (SoG and PS).

  6. Winter Storms & Wind

  7. Seasonal Marine Climate

  8. Climate Change?

  9. River Discharge (1 m3/s = 27 cfps) 100,000 cfps

  10. River Discharge [m3/s], with Columbia River

  11. Seasonal Weather Patterns

  12. Seasonal Upwelling

  13. Salish Sea: Estuarine Circulation Out-flow (Q1) is ~10x River discharge (QR) due to Tidal Mixing: Q1=QR+Q2 Q1=QR+9QR

  14. Classic Estuarine Salinity (and Nutrient) Distribution

  15. Tidal Mixing at “Turns” and “Narrows” is critical for maximizing exchange and forming water masses

  16. Residence Times: Surface waters between 30-90 days, Behind Sills: 60-180 days

  17. VENUS: Multi-year time series of bottom T/S/DO Saanich: 100m SoG: 300 & 170m

  18. Pacific Forcing: ENSO, PDO, and NPGO (OMG) PDO (& ENSO) are First PC/EOF of SSTa, NPGO is Second PC/EOF of SSHa

  19. Salish Sea Conditions and Responses to Forcing • Both SoG and PS respond in phase to • seasons and regional forcing: • The rivers (rain and snow): seasonal variations and regional forcing PDO/ENSO • The temperature (warm/cold): season & weather and regional PDO/ENSO • The salinity & nutrients: upwelling and regional NPGO • Mixing by tides and wind: regional • Habitat Variations are Common • Differences • Localized influences: i.e. eutrophication in back-waters of PS

  20. Changing Land Use

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