Stable carbon and oxygen isotope record of Neogloboquadrina pachyderma and Cibicides lobatulus from the southwestern Greenland Sea

A core transect across the southwestern Greenland Sea reveals coeval events of extremely negative planktic and benthic delta13C excursions between 40 and 87 ka. The most pronounced event, event 1, began at peak Dansgaard-Oeschger stadial 22 (85 ka) with a duration of 18 k.y. During this episode, inc...

Full description

Bibliographic Details
Main Authors: Millo, Christian, Sarnthein, Michael, Erlenkeuser, Helmut, Frederichs, Thomas
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2005
Subjects:
ARK-XVIII/1
GIK/IfG
Iceland Sea
Impact of Gateways on Ocean Circulation
Climate
and Evolution
Institute for Geosciences
Christian Albrechts University
Kiel
OceanGateways
Ocean Gateways
Oceanpassagen
PC
Piston corer
Polarstern
PS62
PS62/015-3
PS62/017-4
Greenland
East Greenland
Greenland Sea
Iceland
Neogloboquadrina pachyderma
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.738187
https://doi.org/10.1594/PANGAEA.738187
Description
Summary:A core transect across the southwestern Greenland Sea reveals coeval events of extremely negative planktic and benthic delta13C excursions between 40 and 87 ka. The most pronounced event, event 1, began at peak Dansgaard-Oeschger stadial 22 (85 ka) with a duration of 18 k.y. During this episode, incursions of Atlantic Intermediate Water caused a bottom-water warming of up to 8 °C. The amplitude, timing, and geographic pattern of the delta13C events suggest that this bottom-water warming triggered clathrate instability along the East Greenland slope and a methane-induced depletion of delta13CDIC (DIC- dissolved inorganic carbon). Since delta13C event 1 matches a major peak in atmospheric CH4 concentration, this clathrate destabilization may have contributed to the rise in atmospheric CH4 and thus to climate warming over marine isotope stage 5.1.

Similar Items