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Significant transient pCO(2) perturbation at the New Zealand Oligocene-Miocene transition recorded by fossil plant stomata
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper. Swedish Museum of Natural History, Sweden.
Rekke forfattare: 32019 (engelsk)Inngår i: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 515, s. 152-161Artikkel i tidsskrift (Fagfellevurdert) Published
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 pCO(2) was an important factor. Oscillating episodes of climate change during the Oligocene Miocene transition (OMT) have however been difficult to reconcile with existing pCO(2) records. Here we present a new pCO(2) 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 pCO(2) 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 pCO(2) ranging 582-732 ppm (average 650 ppm) at the OMT, falling precipitously to mean values of 430-538 ppm (average 492 ppm) for the earliest Miocene and similar to 454-542 ppm (average 502 ppm) in the early Miocene. The much higher values of pCO(2) at the OMT indicate that pCO played an important role in climate dynamics during this time, potentially including the abrupt termination of glaciations.

sted, utgiver, år, opplag, sider
2019. Vol. 515, s. 152-161
Emneord [en]
Stomatal proxy, Climate change, Oligocene-Miocene boundary, Mi-1 termination, Lauraceae
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-166742DOI: 10.1016/j.palaeo.2018.01.039ISI: 000457811700013OAI: oai:DiVA.org:su-166742DiVA, id: diva2:1296926
Tilgjengelig fra: 2019-03-18 Laget: 2019-03-18 Sist oppdatert: 2019-03-18bibliografisk kontrollert

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