ORBi: Henrot Alexandra - Middle Miocene climate and vegetation modelling with PLASIM and CARAIB

Reference : Middle Miocene climate and vegetation modelling with PLASIM and CARAIB


	Document type :	Scientific congresses and symposiums : Unpublished conference
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/37182

Title :	Middle Miocene climate and vegetation modelling with PLASIM and CARAIB
Language :	English
Author, co-author :	Henrot, Alexandra [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	François, Louis [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
	Favre, Eric [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
	Munhoven, Guy [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) - Pétrologie, géochimie endogènes et pétrophysique >]
	Butzin, Martin [Universität Bremen > MARUM - Center for Marine Environmental Sciences > > >]
Publication date :	21-Apr-2009
Peer reviewed :	No
On invitation :	No
Audience :	International
Event name :	EGU General Assembly 2009
Event date :	from 19-04-2009 to 24-04-2009
Event organizer :	European Geosciences Union
Event place (city) :	Vienna
Event country :	Austria
Keywords :	[en] Miocene ; Climate change ; Vegetation dynamics ; Modelling ; Carbon dioxide
Abstract :	[en] In a long-term climatic cooling trend, the Middle Miocene represents one of the last warm periods of the Neogene, culminating with the Miocene Climatic Optimum, MCO (17-15 My). Palynological studies suggest that the warmer climatic conditions prevailing during the MCO allowed warm forests to expand poleward of the subtropical zone, with evergreen forests proliferating in North America and Europe (Jimenez-Moreno and Suc, 2007, Palaeogeogr. Palaeoclimatol. Palaeoecol. 253: 208-225). In this work, we used the Planet Simulator (Fraedrich et al., 2005, Meteorol. Z. 14: 299-304 and 305-314), an Earth system model of intermediate complexity, to carry out several simulation experiments, where we have assessed the effects of the absence of ice on the continents, the opening of the Central American and Eastern Tethys seaways, the lowering of the topography on land and the effect of various atmospheric CO2 concentrations, in agreement with the values reported in the litterature. We then produced several vegetation distributions, using the dynamic vegetation model CARAIB (Galy et al., 2008, Quat. Sci. Rev. 27: 1396-1409), to analyse if the climatic forcings considered are sufficient to explain the expansion of warmer forest types to higher latitudes. Our results indicate that an increase of atmospheric CO2 concentration, higher than the present-day one, is necessary to allow subtropical forest types to expand poleward. This result agrees with recent paleo-atmospheric CO2 reconstruction from stomatal frequency analysis, which suggests 500 ppmv of CO2 during the MCO. However, the required warming may be due to processes not considered in our setup (e.g. full oceanic circulation or other greenhouse gases).
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Deutsche Forschungsgemeinschaft - DFG
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/37182
Other URL :	http://meetingorganizer.copernicus.org/EGU2009/EGU2009-5407.pdf

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