Modeling a modern-like <i>p</i>CO2 warm period (Marine Isotope Stage KM5c) with two versions of an Institut Pierre Simon Laplace atmosphere-ocean coupled general circulation model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Climate of the Past Année : 2020

Modeling a modern-like pCO2 warm period (Marine Isotope Stage KM5c) with two versions of an Institut Pierre Simon Laplace atmosphere-ocean coupled general circulation model

Résumé

The mid-Piacenzian warm period (3.264 to3.025 Ma) is the most recent geological period with present-like atmosphericpCO2and is thus expected to have exhib-ited a warm climate similar to or warmer than the present day.On the basis of understanding that has been gathered on theclimate variability of this interval, a specific interglacial (Ma-rine Isotope Stage KM5c, MIS KM5c; 3.205 Ma) has beenselected for the Pliocene Model Intercomparison Projectphase 2 (PlioMIP 2). We carried out a series of experimentsaccording to the design of PlioMIP2 with two versions ofthe Institut Pierre Simon Laplace (IPSL) atmosphere–oceancoupled general circulation model (AOGCM): IPSL-CM5Aand IPSL-CM5A2. Compared to the PlioMIP 1 experiment,run with IPSL-CM5A, our results show that the simulatedMIS KM5c climate presents enhanced warming in mid- tohigh latitudes, especially over oceanic regions. This warmingcan be largely attributed to the enhanced Atlantic MeridionalOverturning Circulation caused by the high-latitude seawaychanges. The sensitivity experiments, conducted with IPSL-CM5A2, show that besides the increasedpCO2, both mod-ified orography and reduced ice sheets contribute substan-tially to mid- to high latitude warming in MIS KM5c. Whenconsidering thepCO2uncertainties (+/−50 ppmv) duringthe Pliocene, the response of the modeled mean annual sur-face air temperature to changes topCO2(+/−50 ppmv) isnot symmetric, which is likely due to the nonlinear responseof the cryosphere (snow cover and sea ice extent). By an-alyzing the Greenland Ice Sheet surface mass balance, wealso demonstrate its vulnerability under both MIS KM5c andmodern warm climate
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hal-02861696 , version 1 (26-07-2020)

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Ning Tan, Camille Contoux, Gilles Ramstein, Yong Sun, Christophe Dumas, et al.. Modeling a modern-like pCO2 warm period (Marine Isotope Stage KM5c) with two versions of an Institut Pierre Simon Laplace atmosphere-ocean coupled general circulation model. Climate of the Past, 2020, 16 (1), pp.1-16. ⟨10.5194/cp-16-1-2020⟩. ⟨hal-02861696⟩
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