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30. -20.0. 20. -21.0. -22.0. 10. -23. 12. -24. 10. -25. 8. 1700. 1750. 1800. 1850. 1900. 1950. 2000. Bering Sea: Skan Bay Core. Paleoproductivity > 1976 Regime-shift Bering Sea: d 13 C - decrease Opal - variable Gulf of Alaska: d 13 C - increase
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30 -20.0 20 -21.0 -22.0 10 -23 12 -24 10 -25 8 1700 1750 1800 1850 1900 1950 2000 Bering Sea: Skan Bay Core Paleoproductivity > 1976 Regime-shift Bering Sea: d13C - decrease Opal - variable Gulf of Alaska: d13C - increase Opal - increase d13C Opal (%) Gulf of Alaska: GAK 4 Core d13C GOA GAK 4 Opal (%) Skan Bay d13C Opal (%) Year AD