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Global trends of pCO2 across the Cretaceous–Paleogene boundary supported by the first Southern Hemisphere stomatal proxy-based pCO2 reconstruction
Swedish Museum of Natural History, Department of Paleobiology. Bolin Centre for Climate Research, Stockholm University.ORCID iD: 0000-0002-7893-1142
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
Queensland Herbarium, Brisbane Botanic Gardens, Mt. Coot-tha, Mt. Coot-tha Rd., Toowong, QLD 4066, Australia.
2016 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 464, p. 143-152Article in journal (Refereed) Published
Abstract [en]

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 differ- ences. 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 bound- ary (K–Pg) locality, in New Zealand. We use two independent methods of stomatal density-based pCO2 recon- structions; 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 world- wide was responding to significant changes in pCO2 across the K–Pg. 

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2016. Vol. 464, p. 143-152
Keywords [en]
K–Pg; Carbon dioxide; Stomatal proxy; Late Cretaceous; Lauraceae; New Zealand
National Category
Natural Sciences Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2899DOI: 10.1016/j.palaeo.2016.04.033OAI: oai:DiVA.org:nrm-2899DiVA, id: diva2:1257808
Funder
Swedish Research Council, 2016-04905Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-23Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1016/j.palaeo.2016.04.033

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Steinthorsdottir, MargretVajda, Vivi
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