Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies
During the Pliocene (2.6 to 5Ma ago) atmospheric CO2 levels have been estimated as similar to or slightly above present levels (Tripati et al., 2009; Pagani et al., 2010), and yet Earth's climate was considerably different. Recent evidence suggests that although global temperatures were 2-3°C w...
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ftcarletonunivir:oai:carleton.ca:23166 2023-05-15T14:54:44+02:00 Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies Csank, A.Z. (Adam Z.) Tripati, A.K. (Aradhna K.) Patterson, W.P. (William P.) Eagle, R.A. (Robert A.) Rybczynski, N. (Natalia) Ballantyne, A.P. (Ashley P.) Eiler, J.M. (John M.) 2011-04-15 https://ir.library.carleton.ca/pub/23166 https://doi.org/10.1016/j.epsl.2011.02.030 en eng https://ir.library.carleton.ca/pub/23166 doi:10.1016/j.epsl.2011.02.030 Earth and Planetary Science Letters vol. 304 no. 3-4, pp. 291-299 'clumped' isotopes Arctic Oxygen isotopes Palaeoclimate Pliocene info:eu-repo/semantics/article 2011 ftcarletonunivir https://doi.org/10.1016/j.epsl.2011.02.030 2022-02-06T21:50:13Z During the Pliocene (2.6 to 5Ma ago) atmospheric CO2 levels have been estimated as similar to or slightly above present levels (Tripati et al., 2009; Pagani et al., 2010), and yet Earth's climate was considerably different. Recent evidence suggests that although global temperatures were 2-3°C warmer than pre-industrial, Arctic warming may have been amplified during the Pliocene. Thus precise temperature records of this interval are required to assess the sensitivity of Earth's climate to persistent levels of CO2 between 365 and 415ppm.We present records of two independent proxies for terrestrial growing-season temperatures at the Early Pliocene Beaver Pond site on Ellesmere Island. δ18O values of cellulose from well-preserved peat constrain the δ18O values of meteoric water to -20.7±0.3‰, which we combined with δ18Ovalues of aragonitic freshwater molluscs found within the peat in order to calculate mollusc growth temperatures. This approach results in an average growing-season temperature of 14.2±1.3°C. Temperatures were independently derived by applying carbonate 'clumped isotope' thermometry to mollusc shells from the same site, indicating an average growing-season temperature of 10.2±1.4°C. A one-way ANOVA indicates that the differences between the two techniques are not significant as the difference in mean temperatures between both methods is no different than the difference between individual shells using a single technique. Both techniques indicate temperatures ~11-16°C warmer than present (May-Sept temperature=-1.6±1.3°C) and represent the first thermodynamic proxy results for Early Pliocene Ellesmere Island. Article in Journal/Newspaper Arctic Ellesmere Island Carleton University's Institutional Repository Arctic Ellesmere Island Beaver Pond ENVELOPE(-56.848,-56.848,49.600,49.600) Earth and Planetary Science Letters 304 3-4 291 299 |
institution |
Open Polar |
collection |
Carleton University's Institutional Repository |
op_collection_id |
ftcarletonunivir |
language |
English |
topic |
'clumped' isotopes Arctic Oxygen isotopes Palaeoclimate Pliocene |
spellingShingle |
'clumped' isotopes Arctic Oxygen isotopes Palaeoclimate Pliocene Csank, A.Z. (Adam Z.) Tripati, A.K. (Aradhna K.) Patterson, W.P. (William P.) Eagle, R.A. (Robert A.) Rybczynski, N. (Natalia) Ballantyne, A.P. (Ashley P.) Eiler, J.M. (John M.) Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
topic_facet |
'clumped' isotopes Arctic Oxygen isotopes Palaeoclimate Pliocene |
description |
During the Pliocene (2.6 to 5Ma ago) atmospheric CO2 levels have been estimated as similar to or slightly above present levels (Tripati et al., 2009; Pagani et al., 2010), and yet Earth's climate was considerably different. Recent evidence suggests that although global temperatures were 2-3°C warmer than pre-industrial, Arctic warming may have been amplified during the Pliocene. Thus precise temperature records of this interval are required to assess the sensitivity of Earth's climate to persistent levels of CO2 between 365 and 415ppm.We present records of two independent proxies for terrestrial growing-season temperatures at the Early Pliocene Beaver Pond site on Ellesmere Island. δ18O values of cellulose from well-preserved peat constrain the δ18O values of meteoric water to -20.7±0.3‰, which we combined with δ18Ovalues of aragonitic freshwater molluscs found within the peat in order to calculate mollusc growth temperatures. This approach results in an average growing-season temperature of 14.2±1.3°C. Temperatures were independently derived by applying carbonate 'clumped isotope' thermometry to mollusc shells from the same site, indicating an average growing-season temperature of 10.2±1.4°C. A one-way ANOVA indicates that the differences between the two techniques are not significant as the difference in mean temperatures between both methods is no different than the difference between individual shells using a single technique. Both techniques indicate temperatures ~11-16°C warmer than present (May-Sept temperature=-1.6±1.3°C) and represent the first thermodynamic proxy results for Early Pliocene Ellesmere Island. |
format |
Article in Journal/Newspaper |
author |
Csank, A.Z. (Adam Z.) Tripati, A.K. (Aradhna K.) Patterson, W.P. (William P.) Eagle, R.A. (Robert A.) Rybczynski, N. (Natalia) Ballantyne, A.P. (Ashley P.) Eiler, J.M. (John M.) |
author_facet |
Csank, A.Z. (Adam Z.) Tripati, A.K. (Aradhna K.) Patterson, W.P. (William P.) Eagle, R.A. (Robert A.) Rybczynski, N. (Natalia) Ballantyne, A.P. (Ashley P.) Eiler, J.M. (John M.) |
author_sort |
Csank, A.Z. (Adam Z.) |
title |
Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
title_short |
Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
title_full |
Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
title_fullStr |
Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
title_full_unstemmed |
Estimates of Arctic land surface temperatures during the early Pliocene from two novel proxies |
title_sort |
estimates of arctic land surface temperatures during the early pliocene from two novel proxies |
publishDate |
2011 |
url |
https://ir.library.carleton.ca/pub/23166 https://doi.org/10.1016/j.epsl.2011.02.030 |
long_lat |
ENVELOPE(-56.848,-56.848,49.600,49.600) |
geographic |
Arctic Ellesmere Island Beaver Pond |
geographic_facet |
Arctic Ellesmere Island Beaver Pond |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_source |
Earth and Planetary Science Letters vol. 304 no. 3-4, pp. 291-299 |
op_relation |
https://ir.library.carleton.ca/pub/23166 doi:10.1016/j.epsl.2011.02.030 |
op_doi |
https://doi.org/10.1016/j.epsl.2011.02.030 |
container_title |
Earth and Planetary Science Letters |
container_volume |
304 |
container_issue |
3-4 |
container_start_page |
291 |
op_container_end_page |
299 |
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1766326493705666560 |