The past is a guide to the future? Comparing Middle Pliocene vegetation with predicted biome distributions for the twenty-first century

Salzmann, U.; Haywood, A.M.; Lunt, D.J.. 2009 The past is a guide to the future? Comparing Middle Pliocene vegetation with predicted biome distributions for the twenty-first century. Philosophical Transactions of the Royal Society of London, A, 367 (1886). 189-204. 10.1098/rsta.2008.0200

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Abstract/Summary

During the Middle Pliocene, the Earth experienced greater global warmth compared with today, coupled with higher atmospheric CO2 concentrations. To determine the extent to which the Middle Pliocene can be used as a ‘test bed’ for future warming, we compare data and model-based Middle Pliocene vegetation with simulated global biome distributions for the mid- and late twenty-first century. The best agreement is found when a Middle Pliocene biome reconstruction is compared with a future scenario using 560ppmv atmospheric CO2. In accordance with palaeobotanical data, all model simulations indicate a generally warmer and wetter climate, resulting in a northward shift of the taiga–tundra boundary and a spread of tropical savannahs and woodland in Africa and Australia at the expense of deserts. Our data–model comparison reveals differences in the distribution of polar vegetation, which indicate that the high latitudes during the Middle Pliocene were still warmer than its predicted modern analogue by several degrees. However, our future scenarios do not consider multipliers associated with ‘long-term’ climate sensitivity. Changes in global temperature, and thus biome distributions, at higher atmospheric CO2 levels will not have reached an equilibrium state (as is the case for the Middle Pliocene) by the end of this century.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1098/rsta.2008.0200
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Greenhouse to Icehouse. Evolution of the Antarctic Cryosphere and Palaeoenvironment
ISSN:	1364-503X
NORA Subject Terms:	Ecology and Environment Earth Sciences
Date made live:	05 Feb 2009 16:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/5893

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