气候变化领域集成服务门户(CCPortal): Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath

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DOI	10.5194/cp-16-953-2020
	Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath
	Laugié M.; Donnadieu Y.; Ladant J.-B.; Mattias Green J.A.; Bopp L.; Raisson F.
发表日期	2020
ISSN	18149324
起始页码	953
结束页码	971
卷号	16 期号:3
英文摘要	During past geological times, the Earth experienced several intervals of global warmth, but their driving factors remain equivocal. A careful appraisal of the main processes controlling past warm events is essential to inform future climates and ultimately provide decision makers with a clear understanding of the processes at play in a warmer world. In this context, intervals of greenhouse climates, such as the thermal maximum of the Cenomanian-Turonian (∼ 94 Ma) during the Cretaceous Period, are of particular interest. Here we use the IPSL-CM5A2 (IPSL: Institut Pierre et Simon Laplace) Earth system model to unravel the forcing parameters of the Cenomanian-Turonian greenhouse climate. We perform six simulations with an incremental change in five major boundary conditions in order to isolate their respective role on climate change between the Cenomanian-Turonian and the preindustrial. Starting with a preindustrial simulation, we implement the following changes in boundary conditions: (1) the absence of polar ice sheets, (2) the increase in atmospheric pCO2 to 1120 ppm, (3) the change in vegetation and soil parameters, (4) the 1% decrease in the Cenomanian-Turonian value of the solar constant and (5) the Cenomanian-Turonian palaeogeography. Between the preindustrial simulation and the Cretaceous simulation, the model simulates a global warming of more than 11 C. Most of this warming is driven by the increase in atmospheric pCO2 to 1120 ppm. Palaeogeographic changes represent the second major contributor to global warming, whereas the reduction in the solar constant counteracts most of geographically driven warming. We further demonstrate that the implementation of Cenomanian-Turonian boundary conditions flattens meridional temperature gradients compared to the preindustrial simulation. Interestingly, we show that palaeogeography is the major driver of the flattening in the low latitudes to midlatitudes, whereas pCO2 rise and polar ice sheet retreat dominate the highlatitude response. © 2020 Author(s).
语种	英语
scopus关键词	boundary condition; carbon dioxide; Cenomanian-Turonian boundary; climate change; Cretaceous; global warming; ice retreat; ice sheet; paleogeography; temperature gradient
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146709
作者单位	Aix-Marseille Univ, CNRS, IRD, INRA, Coll. France, CEREGE, Aix-en-Provence, France; Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States; School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom; Département des Geósciences, Ecole Normale Supérieure (ENS Paris), Paris, France; Laboratoire de Méteórologie Dynamique, Sorbonne Université, CNRS, École Normale Supérieure, Paris, France; Total EP, RandD Frontier Exploration, Pau, France
推荐引用方式 GB/T 7714	Laugié M.,Donnadieu Y.,Ladant J.-B.,et al. Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath[J],2020,16(3).
APA	Laugié M.,Donnadieu Y.,Ladant J.-B.,Mattias Green J.A.,Bopp L.,&Raisson F..(2020).Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath.Climate of the Past,16(3).
MLA	Laugié M.,et al."Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath".Climate of the Past 16.3(2020).