1. Impact of Antarctic Circumpolar Current Development on Late Paleogene Ocean Structure
Miriam E. Katz et al.
Group. 1 허록
공종현
이승태
이다솜 /

2. Modern Antarctic Ocean
Clockwise
AABW
NADW(CDW)
Strongest
AAIW

3. Modern Ocean Structure
Surface Water
Intermediate Water
Deep Water
Bottom Water
Miocene? vs
Oligocene?

4. Pre-mid-Eocene
Warmer Climate
Closed Passage
No ACC /

5. Tectonic Movement Late Eocene Tasman Gateway Drake Passage Depth(m)
NCW
SCW S N

6. Shallow ACC Shallow ACC Antarctic Isolation Ice Sheets Oi-1
ODP Site : Ocean Drilling Project Site
ASP5 : Atlantic Slope Project

7. Shallow ACC
δ 18 O Offsets
GSR
Shallow ACC
AAIW
Depth(m)
SCW
NCW S N

8. Deep ACC 31~30Ma Site 522, 747, 748 δ 18 C Offsets AAIW Deep ACC AAIW
Depth(m)
NCW
SCW S N

9. Conclusion
ACC through the Drake passage followed by rapid deeping of the Tasman gateway from the late Eocene to early Oligocene and more-gradual deeping of the Drake passage through the remainder of the Oligocene.
Shallow ACC led to Antarctic Isolation and: allowing large scale ice sheets.
Deep ACC strengthened AAIW, NADW and AABW.
The modern four-layer ocean structure developed during the early Oligocene as a consequence of the ACC
Doubthouse climate
Late Paleogene
Early Paleogene

10. Reference
Impact of Antarctic Circumpolar Current Developmen on Late Paleogene Ocean Structure Fig.1 to 3/ Miriam E. Katz et al.
Antarctic Oceanography / Lecture 5
Thank you.