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Impact of Climate Change on Marine Ecosystems: Mechanisms and Observing Methods

This summary explores the physical mechanisms linked to climate change affecting marine ecosystems. Key phenomena include low salinity events influencing stratification, and the role of sea ice and cross-shelf transport modified by oceanic features. Climate-driven biological mechanisms, like variations in krill recruitment due to transport changes, are critically examined. The summary also highlights the need for year-round sampling methods and adaptive studies to capture fine-scale features. Understanding these dynamics is essential for predicting future impacts on marine biodiversity.

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Impact of Climate Change on Marine Ecosystems: Mechanisms and Observing Methods

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Presentation Transcript

  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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