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Significant transient pCO2 perturbation at the New Zealand Oligocene- Miocene transition recorded by fossil plant stomata
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
2018 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 515, p. 152-161Article in journal (Refereed) Epub ahead of print
Abstract [en]

The reorganisation of Earth's climate system from the Oligocene to the Miocene was influenced by complex interactions between Tethyan tectonics, orbital parameters, oceanographic changes, and carbon cycle feedbacks, with climate modelling indicating that pCO2 was an important factor. Oscillating episodes of climate change during the Oligocene–Miocene transition (OMT) have however been difficult to reconcile with existing pCO2 records. Here we present a new pCO2 record from the OMT into the early Miocene, reconstructed using the stomatal proxy method with a database of fossil Lauraceae leaves from New Zealand. The leaf database derives from three relatively well-dated sites located in the South Island of New Zealand; Foulden Maar, Mataura River and Grey Lake. Atmospheric pCO2 values were obtained based on four separate calibrations with three nearest living equivalents, using the stomatal ratio method as well as transfer functions. Our results, based on the mean values of each of the four calibrations, indicate pCO2 ranging ~582–732 ppm (average 650 ppm) at the OMT, falling precipitously to mean values of ~430–538ppm (average 492ppm) for the earliest Miocene and ~454–542 ppm (average 502 ppm) in the early Miocene. The much higher values of pCO2 at the OMT indicate that pCO played an important role in climate dynamics during this time, potentially including the abrupt ter- mination of glaciations. 

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2018. Vol. 515, p. 152-161
Keywords [en]
Stomatal proxy; Climate change; Oligocene–Miocene boundary; Mi-1 termination; Lauraceae
National Category
Natural Sciences Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2897DOI: 10.1016/j.palaeo.2018.01.039OAI: oai:DiVA.org:nrm-2897DiVA, id: diva2:1257805
Funder
Swedish Research Council, 2016-04905Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2019-01-07Bibliographically approved

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Publisher's full texthttps://doi.org/10.1016/j.palaeo.2018.01.039

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Steinthorsdottir, MargretVajda, Vivi
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