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Global trends of pCO2 across the Cretaceous–Paleogene boundary supported by the first Southern Hemisphere stomatal proxy-based pCO2 reconstruction

Steinthorsdottir, Margret; Vajda, Vivi LU and Pole, Mike (2016) In Palaeogeography, Palaeoclimatology, Palaeoecology 464. p.143-152
Abstract

Reliable reconstructions of atmospheric carbon dioxide concentrations (pCO2) are required at higher resolution than currently available to help resolve the relationship between mass extinctions and changes in palaeo-pCO2 levels. Such reconstructions are needed: 1, at a high temporal resolution for constraining the pre- and post-extinction atmospheres; and 2, at a sufficient spatial resolution to constrain potential inter-hemispheric differences. Here we estimate pCO2 based on fossil Lauraceae leaf cuticle specimens derived from three localities with strata spanning the latest Cretaceous to the mid-Paleocene, including a new Cretaceous–Paleogene boundary (K–Pg) locality, in New Zealand. We use two... (More)

Reliable reconstructions of atmospheric carbon dioxide concentrations (pCO2) are required at higher resolution than currently available to help resolve the relationship between mass extinctions and changes in palaeo-pCO2 levels. Such reconstructions are needed: 1, at a high temporal resolution for constraining the pre- and post-extinction atmospheres; and 2, at a sufficient spatial resolution to constrain potential inter-hemispheric differences. Here we estimate pCO2 based on fossil Lauraceae leaf cuticle specimens derived from three localities with strata spanning the latest Cretaceous to the mid-Paleocene, including a new Cretaceous–Paleogene boundary (K–Pg) locality, in New Zealand. We use two independent methods of stomatal density-based pCO2 reconstructions; a transfer function calibrated using herbarium material and the stomatal ratio method, producing three calibration sets. Our results based on the mean values of each of the three calibration methods indicate pCO2 ranging between ca. 460 and 650 ppm during the latest Cretaceous, falling precipitously to average values between ca. 360 and 430 ppm across the K–Pg boundary, and further to ca. 305–320 ppm in the mid-Paleocene. A ‘spike’ of extremely high pCO2 at the K–Pg could not be confirmed, but our results are, nonetheless, consistent with previously published pCO2 records from the Northern Hemisphere, and show that stomatal density worldwide was responding to significant changes in pCO2 across the K–Pg.

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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Carbon dioxide, K–Pg, Late Cretaceous, Lauraceae, New Zealand, Stomatal proxy
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
464
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:84975769695
  • wos:000389109600012
ISSN
0031-0182
DOI
10.1016/j.palaeo.2016.04.033
language
English
LU publication?
yes
id
4bf4bc82-2f34-44e5-9be7-fd239db1f099
date added to LUP
2016-11-25 07:34:25
date last changed
2017-09-18 11:31:15
@article{4bf4bc82-2f34-44e5-9be7-fd239db1f099,
  abstract     = {<p>Reliable reconstructions of atmospheric carbon dioxide concentrations (pCO<sub>2</sub>) are required at higher resolution than currently available to help resolve the relationship between mass extinctions and changes in palaeo-pCO<sub>2</sub> levels. Such reconstructions are needed: 1, at a high temporal resolution for constraining the pre- and post-extinction atmospheres; and 2, at a sufficient spatial resolution to constrain potential inter-hemispheric differences. Here we estimate pCO<sub>2</sub> based on fossil Lauraceae leaf cuticle specimens derived from three localities with strata spanning the latest Cretaceous to the mid-Paleocene, including a new Cretaceous–Paleogene boundary (K–Pg) locality, in New Zealand. We use two independent methods of stomatal density-based pCO<sub>2</sub> reconstructions; a transfer function calibrated using herbarium material and the stomatal ratio method, producing three calibration sets. Our results based on the mean values of each of the three calibration methods indicate pCO<sub>2</sub> ranging between ca. 460 and 650 ppm during the latest Cretaceous, falling precipitously to average values between ca. 360 and 430 ppm across the K–Pg boundary, and further to ca. 305–320 ppm in the mid-Paleocene. A ‘spike’ of extremely high pCO<sub>2</sub> at the K–Pg could not be confirmed, but our results are, nonetheless, consistent with previously published pCO<sub>2</sub> records from the Northern Hemisphere, and show that stomatal density worldwide was responding to significant changes in pCO<sub>2</sub> across the K–Pg.</p>},
  author       = {Steinthorsdottir, Margret and Vajda, Vivi and Pole, Mike},
  issn         = {0031-0182},
  keyword      = {Carbon dioxide,K–Pg,Late Cretaceous,Lauraceae,New Zealand,Stomatal proxy},
  language     = {eng},
  month        = {12},
  pages        = {143--152},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {Global trends of pCO<sub>2</sub> across the Cretaceous–Paleogene boundary supported by the first Southern Hemisphere stomatal proxy-based pCO<sub>2</sub> reconstruction},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2016.04.033},
  volume       = {464},
  year         = {2016},
}