The relative roles of CO2 and palaeogeography in determining late Miocene climate: results from a terrestrial model–data comparison

Bradshaw, Catherine, Lunt, Daniel, Flecker, Rachel, Salzmann, Ulrich, Pound, Matthew, Haywood, Alan and Eronen, Jussi (2012) The relative roles of CO2 and palaeogeography in determining late Miocene climate: results from a terrestrial model–data comparison. Climate of the Past, 8 (4). pp. 1257-1285. ISSN 1814-9332

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Official URL: http://dx.doi.org/10.5194/cp-8-1257-2012

Abstract

The late Miocene palaeorecord provides evidence for a warmer and wetter climate than that of today, and there is uncertainty in the palaeo-CO2 record of at least 200 ppm. We present results from fully coupled atmosphere-ocean-vegetation simulations for the late Miocene that examine the relative roles of palaeogeography (topography and ice sheet geometry) and CO2 concentration in the determination of late Miocene climate through comprehensive terrestrial model-data comparisons. Assuming that these data accurately reflect the late Miocene climate, and that the late Miocene palaeogeographic reconstruction used in the model is robust, then results indicate that:

1. Both palaeogeography and atmospheric CO2 contribute to the proxy-derived precipitation differences between the late Miocene and modern reference climates. However these contributions exibit synergy and so do not add linearly.

2. The vast majority of the proxy-derived temperature differences between the late Miocene and modern reference climates can only be accounted for if we assume a palaeo-CO2 concentration towards the higher end of the range of estimates.

Item Type: Article
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography
Depositing User: Ay Okpokam
Date Deposited: 17 Oct 2013 12:11
Last Modified: 13 Feb 2016 03:42
URI: http://nrl.northumbria.ac.uk/id/eprint/13955

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