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Group 1 Summary

Group 1 Summary. Physical Mechanisms associated with climate change. GB Low salinity event affects stratification SO Sea ice cross-shelf transport modified by position of the AntCC CGOA Strength of onshore transport modified by 200km eddies CC Strength of north/south transport; upwelling

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Group 1 Summary

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  1. Group 1 Summary

  2. Physical Mechanisms associated with climate change • GB • Low salinity event affects stratification • SO • Sea ice • cross-shelf transport modified by position of the AntCC • CGOA • Strength of onshore transport modified by 200km eddies • CC • Strength of north/south transport; upwelling • Common • Eddies affecting cross-shelf transport • Freshwater/deepwater input

  3. Climate-driven biological mechanisms • GB • salinity and stratification affect phyt->zoop->larvae • SO • Varying krill recruitment depends on cross shelf transport, food variability, sea ice extent • CGOA • Changes in onshore advection of zooplankton affect salmon growth • CC • change zoop species composition and predators due to alongshore advection and upwelling

  4. Hot Spots and Episodic Events • GB • Is one big hot spot! • Wind driven egg mortality due to storms • SO • Polynyas • Breeding colonies near reliable food • CGOA • Shallow banks have greater tidal mixing • Upwelling episodes • CC • Heceta Bank • Late upwelling via 20-day variability • Downwelling/relaxation episodes

  5. Key attributes/Observing methods • Different seasons are important for different taxa; need for year-round sampling • Fixed stations/long time series are valuable BUT • Fine-scale features require adaptive sampling and process studies

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