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Paleoproductivity
2000195019001850180017501700-25
-24
-23
8
10
12
13COpal (%)
Gulf of Alaska: GAK 4 Core
Year AD
Op
al (
%)
-22.0
-21.0
-20.0
10
20
30
13C
Op
al (
%)
GOA GAK 4
Skan Bay
13C
Bering Sea: Skan Bay Core Paleoproductivity > 1976 Regime-shift
Bering Sea:13C - decreaseOpal - variable
Gulf of Alaska: 13C - increaseOpal - increase
Finney et al.