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Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation

Citation

Pedro, JB and Rasmussen, SO and van Ommen, TD, Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation, Climate of the Past, 8, (4) pp. 1213-1221. ISSN 1814-9324 (2012) [Refereed Article]


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Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.5194/cp-8-1213-2012

Abstract

Antarctic ice cores provide clear evidence of a close coupling between variations in Antarctic temperature and the atmospheric concentration of CO2 during the glacial/interglacial cycles of at least the past 800-thousand years. Precise information on the relative timing of the temperature and CO2 changes can assist in refining our understanding of the physical processes involved in this coupling. Here, we focus on the last deglaciation, 19 000 to 11 000 yr before present, during which CO2 concentrations increased by 80 parts per million by volume and Antarctic temperature increased by ~10°C. Utilising a recently developed proxy for regional Antarctic temperature, derived from five near-coastal ice cores and two ice core CO2 records with high dating precision, we show that the increase in CO2 likely lagged the increase in regional Antarctic temperature by less than 400 yr and that even a short lead of CO2 over temperature cannot be excluded. This result, consistent for both CO2 records, implies a faster coupling between temperature and CO2 than previous estimates, which had permitted up to millennial-scale lags.

Item Details

Item Type:Refereed Article
Keywords:carbon dioxide, concentration, glacial-interglacial cycle, ice core, last deglaciation, paleoclimate, paleotemperature, precision
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Pedro, JB (Mr Joel Pedro)
Author:van Ommen, TD (Dr Tas van Ommen)
ID Code:83685
Year Published:2012
Web of Science® Times Cited:33
Deposited By:IMAS Research and Education Centre
Deposited On:2013-03-20
Last Modified:2013-07-22
Downloads:184 View Download Statistics

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