Change search
ReferencesLink to record
Permanent link

Direct link
Early Jurassic (late Pliensbachian) CO2 concentrations based on stomatalanalysis of fossil conifer leaves from eastern Australia
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
2015 (English)In: Gondwana Research, ISSN 1342-937X, E-ISSN 1878-0571, Vol. 27, 932-939 p.Article in journal (Refereed) Published
Abstract [en]

The stomatal index (a measure of stomatal density) of an extinct Australian Early Jurassic araucariacean conifer species, Allocladus helgei Jansson, is used to reconstruct the atmospheric carbon dioxide concentration (pCO2) in the Early Jurassic. The fossil leaves are preserved in a single bed, palynologically dated to late Pliensbachian (~185–183 Mya). Atmospheric pCO2 is estimated from the ratios between the stomatal index of A. helgei and the stomatal indices of three modern analogs (nearest living equivalent plants). CO2 concentration in the range of ~750–975 ppm was calibrated from the fossil material, with a best-estimated mean of ~900 ppm. The new average pCO2 determined for the late Pliensbachian is thus similar to, although ~10% lower, than previously inferred minimum concentrations of ~1000, based on data from the Northern Hemisphere, but may help constrain pCO2 during this period. Our results are the first pCO2 estimates produced using Jurassic leaves from the Southern Hemisphere and showthat i) paleo-atmospheric pCO2 estimates are consistent at a global scale, though more investigations of Southern Hemisphere material are required, and ii) the stomatal proxy method can now be used without the context of relative change in pCO2 when applying the correct methodology.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 27, 932-939 p.
Keyword [en]
Stomatal proxy method, Paleo-CO2 concentrations, Early Jurassic CO2, Araucariaceae, Southern Hemisphere conifers
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
URN: urn:nbn:se:nrm:diva-1405DOI: 10.1016/ diva2:871430
Swedish Research Council, LUCCI grantSwedish Research Council, 623-2011-1048
Available from: 2015-11-13 Created: 2015-11-13Bibliographically approved

Open Access in DiVA

fulltext(967 kB)37 downloads
File information
File name FULLTEXT01.pdfFile size 967 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Vajda, Vivi
By organisation
Department of Paleobiology
In the same journal
Gondwana Research
Other Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 37 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 84 hits
ReferencesLink to record
Permanent link

Direct link