Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19
[1] Biological and geochemical CO2 proxies provide critical constraints on understanding the role of atmospheric CO2 in driving climate change during Earth history. As no single existing CO2 proxy is without its limitations, there is a clear need for new approaches to reconstructing past CO2 concent...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.496.7227 2023-05-15T13:15:20+02:00 Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 Benjamin J. Fletcher David J. Beerling Stuart J. Brentnall Dana L. Royer The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.7227 http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.7227 http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf text 2005 ftciteseerx 2016-01-08T08:48:56Z [1] Biological and geochemical CO2 proxies provide critical constraints on understanding the role of atmospheric CO2 in driving climate change during Earth history. As no single existing CO2 proxy is without its limitations, there is a clear need for new approaches to reconstructing past CO2 concentrations. Here we develop a new pre-Quaternary CO2 proxy based on the stable carbon isotope composition (d 13C) of astomatous land plants. In a series of CO2-controlled laboratory experiments, we show that the carbon isotope discrimination (D13C) of a range of bryophyte (liverwort and moss) species increases with atmospheric CO2 across the range 375 to 6000 ppm. Separate experiments establish that variations in growth temperature, water content and substrate type have minor impacts on the D13C of liverworts but not mosses, indicating the greater potential of liverworts to faithfully record past variations in CO2. A mechanistic model for calculating past CO2 concentrations from bryophyte D 13C (White et al., 1994) is extended and calibrated using our experimental results. The potential for fossil liverworts to record past CO2 changes is investigated by analyzing the d 13C of specimens collected from Alexander Island, Antarctica dating to the ‘‘greenhouse’ ’ world of the mid-Cretaceous. Our analysis and isotopic model yield mid-Cretaceous CO2 concentrations of 1000–1400 ppm, in general agreement with independent proxy data and long-term carbon cycle models. The exceptionally long evolutionary history of bryophytes offers the possibility of reconstructing CO2 concentrations back to the mid-Ordovician, pre-dating all currently used quantitative CO2 proxies. Text Alexander Island Antarc* Antarctica Unknown Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) |
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[1] Biological and geochemical CO2 proxies provide critical constraints on understanding the role of atmospheric CO2 in driving climate change during Earth history. As no single existing CO2 proxy is without its limitations, there is a clear need for new approaches to reconstructing past CO2 concentrations. Here we develop a new pre-Quaternary CO2 proxy based on the stable carbon isotope composition (d 13C) of astomatous land plants. In a series of CO2-controlled laboratory experiments, we show that the carbon isotope discrimination (D13C) of a range of bryophyte (liverwort and moss) species increases with atmospheric CO2 across the range 375 to 6000 ppm. Separate experiments establish that variations in growth temperature, water content and substrate type have minor impacts on the D13C of liverworts but not mosses, indicating the greater potential of liverworts to faithfully record past variations in CO2. A mechanistic model for calculating past CO2 concentrations from bryophyte D 13C (White et al., 1994) is extended and calibrated using our experimental results. The potential for fossil liverworts to record past CO2 changes is investigated by analyzing the d 13C of specimens collected from Alexander Island, Antarctica dating to the ‘‘greenhouse’ ’ world of the mid-Cretaceous. Our analysis and isotopic model yield mid-Cretaceous CO2 concentrations of 1000–1400 ppm, in general agreement with independent proxy data and long-term carbon cycle models. The exceptionally long evolutionary history of bryophytes offers the possibility of reconstructing CO2 concentrations back to the mid-Ordovician, pre-dating all currently used quantitative CO2 proxies. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Benjamin J. Fletcher David J. Beerling Stuart J. Brentnall Dana L. Royer |
spellingShingle |
Benjamin J. Fletcher David J. Beerling Stuart J. Brentnall Dana L. Royer Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
author_facet |
Benjamin J. Fletcher David J. Beerling Stuart J. Brentnall Dana L. Royer |
author_sort |
Benjamin J. Fletcher |
title |
Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
title_short |
Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
title_full |
Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
title_fullStr |
Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
title_full_unstemmed |
Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19 |
title_sort |
fossil bryophytes as recorders of ancient co2 levels: experimental evidence and a cretaceous case study. global biogeochem. cycles 19 |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.7227 http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf |
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ENVELOPE(-69.895,-69.895,-71.287,-71.287) |
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Alexander Island |
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Alexander Island |
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Alexander Island Antarc* Antarctica |
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Alexander Island Antarc* Antarctica |
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http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.7227 http://droyer.web.wesleyan.edu/CO2_bryophytes(GBC).pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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