Impact of vegetation on the Miocene Climate optimum

You, John and Herold, Nicholas and Muller, Dietmar and Sdrolias, Maria and Ribbe, Joachim ORCID: (2007) Impact of vegetation on the Miocene Climate optimum. In: 14th National Conference of the Australian Meteorological and Oceanographic Society, 5-8 Feb 2007, Adelaide, Australia.


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The present day global warming started well before the industrial revolution about 400 years ago, comprising of two components with one natural and another human induced. Palaeoclimate study provides a key for the present warming on the natural component and, therefore, isolates the human input which can then be determined. The Miocene Climate Optimum (MCO) at 15 ma is a geologically most recent warming event with a temperature of 3º-5ºC higher than today but with atmospheric CO2 only about half its present value, decoupled with the warming. One thus expects that other factors to play more significant roles such as vegetation, altimetry, tectonic movement and other green house gasses. Here we address the vegetation which can potentially contribute about 2º-3ºC warming to the MCO. We develop a novel methodology to merge oceanic palaeo-bathymetry grids with continental palaeo-topography grids to produce Miocene boundary condition for palaeoclimate modelling, compile five vegetation data files as model input and apply updated NCAR coupled climate models, CCSM3 and CAM3.1 and CLM3 coupled with slab ocean and ice models, validated with proxies. Our results show that vegetation played an important role in the MCO development.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: Speech presentation. Conference publication consists of only the abstracts of papers presented at the conference. Abstract only posted here. No evidence of copyright restrictions on web site.
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Biological and Physical Sciences (Up to 30 Jun 2013)
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Biological and Physical Sciences (Up to 30 Jun 2013)
Date Deposited: 11 Oct 2007 00:53
Last Modified: 02 Jul 2013 22:41
Uncontrolled Keywords: climate change, paleo-climatology, vegetation, global warming, Miocene, climate modelling
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040605 Palaeoclimatology
Fields of Research (2020): 37 EARTH SCIENCES > 3702 Climate change science > 370201 Climate change processes
37 EARTH SCIENCES > 3709 Physical geography and environmental geoscience > 370904 Palaeoclimatology

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