Diverse temperate rainforests near the South Pole during peak Cretaceous greenhouse warmth


Contact
Johann.Klages [ at ] awi.de

Abstract

The mid-Cretaceous was one of the warmest intervals of the past 140 million years (Myr) driven by atmospheric CO2 levels around 1000 ppmv. In the near absence of proximal geological records from south of the Antarctic Circle, it remains disputed whether polar ice could exist under such environmental conditions. Here we present results from a unique sedimentary sequence recovered from the West Antarctic shelf. This by far southernmost Cretaceous record contains an intact ~3 m-long network of in-situ fossil roots. The roots are embedded in a mudstone matrix bearing diverse pollen and spores, indicative of a temperate lowland rainforest environment at a palaeolatitude of ~82°S during the Turonian–Santonian (92–83 Myr). A climate model simulation shows that the reconstructed temperate climate at this high latitude requires a combination of both atmospheric CO2 contents of 1120–1680 ppmv and a vegetated land surface without major Antarctic glaciation, highlighting the important cooling effect exerted by ice albedo in high-CO2 climate worlds.



Item Type
Conference (Poster)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
AGU Fall Meeting, 08 Dec 2019 - 14 Dec 2019, San Francisco, USA.
Eprint ID
50902
Cite as
Klages, J. P. , Salzmann, U. , Bickert, T. , Hillenbrand, C. D. , Gohl, K. , Kuhn, G. , Bohaty, S. , Titschack, J. , Müller, J. , Frederichs, T. , Bauersachs, T. , Ehrmann, W. , van de Flierdt, T. , Simoes Pereira, P. , Larter, R. D. , Lohmann, G. , Niezgodzki, I. , Uenzelmann-Neben, G. , Zundel, M. , Spiegel, C. , Mark, C. , Chew, D. , Francis, J. E. , Nehrke, G. , Schwarz, F. , Smith, J. A. , Freudenthal, T. , Esper, O. , Pälike, H. , Ronge, T. and Dziadek, R. , Science Team of Expedition PS104 (2019): Diverse temperate rainforests near the South Pole during peak Cretaceous greenhouse warmth , AGU Fall Meeting, San Francisco, USA, 8 December 2019 - 14 December 2019 .


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