Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation
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 ch...
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fttriple:oai:gotriple.eu:kM5Qv6ICcXq7aqMxUy2k3 2023-05-15T13:38:29+02:00 Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation Pedro, J. B. Rasmussen, S. O. Ommen, T. D. 2018-09-27 https://doi.org/10.5194/cp-8-1213-2012 https://cp.copernicus.org/articles/8/1213/2012/ en eng doi:10.5194/cp-8-1213-2012 10670/1.le0fz1 https://cp.copernicus.org/articles/8/1213/2012/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-8-1213-2012 2023-01-22T17:52:35Z 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. Text Antarc* Antarctic ice core Unknown Antarctic Climate of the Past 8 4 1213 1221 |
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geo envir Pedro, J. B. Rasmussen, S. O. Ommen, T. D. Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
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description |
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. |
format |
Text |
author |
Pedro, J. B. Rasmussen, S. O. Ommen, T. D. |
author_facet |
Pedro, J. B. Rasmussen, S. O. Ommen, T. D. |
author_sort |
Pedro, J. B. |
title |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
title_short |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
title_full |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
title_fullStr |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
title_full_unstemmed |
Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation |
title_sort |
tightened constraints on the time-lag between antarctic temperature and co2 during the last deglaciation |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-8-1213-2012 https://cp.copernicus.org/articles/8/1213/2012/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-8-1213-2012 10670/1.le0fz1 https://cp.copernicus.org/articles/8/1213/2012/ |
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undefined |
op_doi |
https://doi.org/10.5194/cp-8-1213-2012 |
container_title |
Climate of the Past |
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8 |
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4 |
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1213 |
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1221 |
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1766106686112661504 |