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.