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<article language="en">
	<journal>
		<journal_title>Climate of the Past Discussions</journal_title>
		<journal_url>www.clim-past-discuss.net</journal_url>
		<issn>1814-9340</issn>
		<eissn>1814-9359</eissn>
		<volume_number>5</volume_number>
		<issue_number>6</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/cpd-5-2439-2009</doi>
	<article_url>http://www.clim-past-discuss.net/5/2439/2009/</article_url>
	<abstract_html>http://www.clim-past-discuss.net/5/2439/2009/cpd-5-2439-2009.html</abstract_html>
	<fulltext_pdf>http://www.clim-past-discuss.net/5/2439/2009/cpd-5-2439-2009.pdf</fulltext_pdf>
	<start_page>2439</start_page>
	<end_page>2464</end_page>
	<publication_date>2009-11-27</publication_date>
	<article_title content_type="html">Mountain uplift and the threshold for sustained Northern Hemisphere Glaciation</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>G. L. Foster</name>
			<email>g.l.foster@bristol.ac.uk</email>
		</author>
		<author numeration="2" affiliations="2">
			<name>D. J. Lunt</name>
		</author>
		<author numeration="3" affiliations="3">
			<name>R. R. Parrish</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Bristol Isotope Group, Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, UK</affiliation>
		<affiliation numeration="2" content_type="html">School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, UK</affiliation>
		<affiliation numeration="3" content_type="html">NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK</affiliation>
	</affiliations>
	<abstract content_type="html">The Miocene (~24 to ~5 million years ago) was a period of
relative global warmth (e.g. Zachos et al. 2001) characterised by the
glaciation of Antarctica only. Paradoxically, the majority of available
proxy data suggest that during the Miocene &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; was similar, or even
lower, than the pre-industrial levels (280 ppmv; Pagani et al., 1999;
Pearson and Palmer, 2000; Kürschner et al., 1996, 2008) and at times
probably crossed the modelled threshold value required for sustained
glaciation in the Northern Hemisphere (DeConto et al., 2008). Records of ice
rafted debris and the oxygen isotope composition of benthic foraminifera
suggest that at several times over the last 25 million years substantial
amounts of continental ice did build up in the Northern Hemisphere but none
of these led to sustained glaciation. In this contribution we review
evidence that suggests that in the Miocene the North American Cordillera
was, at least in parts, considerably lower than today. We present new GCM
simulations that imply that Late Miocene uplift of the North American
Cordillera would have resulted in significant cooling of Northern North
American Continent. Offline ice sheet modelling, driven by these GCM
outputs, suggests that with a reduced topography inception of the
Cordilleran ice sheet is prohibited, and there is a small, but potentially
significant, reduction in the amount of ice grown on Baffin Island. This
suggests uplift of the North American Cordillera in the Late Miocene may
have played an important role in priming the climate for the intensification
of Northern Hemisphere glaciation in the Late Pliocene.</abstract>
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