Two-phase change in CO2, Antarctic temperature and global climate during Termination II

Landais, A.; Dreyfus, G.; Capron, E.; Jouzel, J.; Masson-Delmotte, V.; Roche, D. M.; Prié, F.; Caillon, N.; Chappellaz, J.; Leuenberger, Markus; Lourantou, A.; Parrenin, F.; Raynaud, D.; Teste, G. (2013). Two-phase change in CO2, Antarctic temperature and global climate during Termination II. Nature geoscience, 6(12), pp. 1062-1065. Nature Publishing Group 10.1038/NGEO1985

[img] Text
ngeo1985.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (260kB) | Request a copy

The end of the Last Glacial Maximum (Termination I), roughly 20 thousand years ago (ka), was marked by cooling in the Northern Hemisphere, a weakening of the Asian monsoon, a rise in atmospheric CO2 concentrations and warming over Antarctica. The sequence of events associated with the previous glacial–interglacial transition (Termination II), roughly 136 ka, is less well constrained. Here we present high-resolution records of atmospheric CO2 concentrations and isotopic composition of N2—an atmospheric temperature proxy—from air bubbles in the EPICA Dome C ice core that span Termination II. We find that atmospheric CO2 concentrations and Antarctic temperature started increasing in phase around 136 ka, but in a second phase of Termination II, from 130.5 to 129 ka, the rise in atmospheric CO2 concentrations lagged that of Antarctic temperature unequivocally. We suggest that during this second phase, the intensification of the low-latitude hydrological cycle resulted in the development of a CO2 sink, which counteracted the CO2 outgassing from the Southern Hemisphere oceans over this period.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Leuenberger, Markus

Subjects:

500 Science > 530 Physics
500 Science > 550 Earth sciences & geology

ISSN:

1752-0894

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

29 Sep 2014 13:47

Last Modified:

19 Oct 2015 09:39

Publisher DOI:

10.1038/NGEO1985

Web of Science ID:

000327799500022

BORIS DOI:

10.7892/boris.49320

URI:

https://boris.unibe.ch/id/eprint/49320

Actions (login required)

Edit item Edit item
Provide Feedback