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Early Jurassic (late Pliensbachian) CO2 concentrations based on stomatal analysis of fossil conifer leaves from eastern Australia

Steinthorsdottir, M. and Vajda, Vivi LU (2015) In Gondwana Research 27(3). p.932-939
Abstract
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 (pCO(2)) in the Early Jurassic. The fossil leaves are preserved in a single bed, palynologically dated to late Pliensbachian (similar to 185-183 Mya). Atmospheric pCO(2) 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 similar to 750-975 ppm was calibrated from the fossil material, with a best-estimated mean of similar to 900 ppm. The new average pCO(2) determined for the late Pliensbachian... (More)
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 (pCO(2)) in the Early Jurassic. The fossil leaves are preserved in a single bed, palynologically dated to late Pliensbachian (similar to 185-183 Mya). Atmospheric pCO(2) 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 similar to 750-975 ppm was calibrated from the fossil material, with a best-estimated mean of similar to 900 ppm. The new average pCO(2) determined for the late Pliensbachian is thus similar to, although similar to 10% lower, than previously inferred minimum concentrations of similar to 1000, based on data from the Northern Hemisphere, but may help constrain pCO(2) during this period. Our results are the first pCO(2) estimates produced using Jurassic leaves from the Southern Hemisphere and show that i) paleo-atmospheric pCO(2) 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 pCO(2) when applying the correct methodology. (C) 2014 The Authors. Published by Elsevier B.V. on behalf of International Association for Gondwana Research. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Stomatal proxy method, Paleo-CO2 concentrations, Early Jurassic CO2, Araucariaceae, Southern Hemisphere conifers
in
Gondwana Research
volume
27
issue
3
pages
932 - 939
publisher
Elsevier
external identifiers
  • wos:000350918800004
  • scopus:84925342534
ISSN
1342-937X
DOI
10.1016/j.gr.2013.08.021
language
English
LU publication?
yes
id
3d5dc316-0bc8-4ece-83cb-db8c3a20e8cd (old id 5281919)
date added to LUP
2015-04-24 12:49:14
date last changed
2017-10-29 03:52:12
@article{3d5dc316-0bc8-4ece-83cb-db8c3a20e8cd,
  abstract     = {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 (pCO(2)) in the Early Jurassic. The fossil leaves are preserved in a single bed, palynologically dated to late Pliensbachian (similar to 185-183 Mya). Atmospheric pCO(2) 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 similar to 750-975 ppm was calibrated from the fossil material, with a best-estimated mean of similar to 900 ppm. The new average pCO(2) determined for the late Pliensbachian is thus similar to, although similar to 10% lower, than previously inferred minimum concentrations of similar to 1000, based on data from the Northern Hemisphere, but may help constrain pCO(2) during this period. Our results are the first pCO(2) estimates produced using Jurassic leaves from the Southern Hemisphere and show that i) paleo-atmospheric pCO(2) 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 pCO(2) when applying the correct methodology. (C) 2014 The Authors. Published by Elsevier B.V. on behalf of International Association for Gondwana Research.},
  author       = {Steinthorsdottir, M. and Vajda, Vivi},
  issn         = {1342-937X},
  keyword      = {Stomatal proxy method,Paleo-CO2 concentrations,Early Jurassic CO2,Araucariaceae,Southern Hemisphere conifers},
  language     = {eng},
  number       = {3},
  pages        = {932--939},
  publisher    = {Elsevier},
  series       = {Gondwana Research},
  title        = {Early Jurassic (late Pliensbachian) CO2 concentrations based on stomatal analysis of fossil conifer leaves from eastern Australia},
  url          = {http://dx.doi.org/10.1016/j.gr.2013.08.021},
  volume       = {27},
  year         = {2015},
}