气候变化领域集成服务门户(CCPortal): Paleogeographic controls on the evolution of Late Cretaceous ocean circulation

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DOI	10.5194/cp-16-973-2020
	Paleogeographic controls on the evolution of Late Cretaceous ocean circulation
	Ladant J.-B.; Poulsen C.J.; Fluteau F.; Tabor C.R.; Macleod K.G.; Martin E.E.; Haynes S.J.; Rostami M.A.
发表日期	2020
ISSN	18149324
起始页码	973
结束页码	1006
卷号	16 期号:3
英文摘要	Understanding of the role of ocean circulation on climate during the Late Cretaceous is contingent on the ability to reconstruct its modes and evolution. Geochemical proxies used to infer modes of past circulation provide conflicting interpretations for the reorganization of the ocean circulation through the Late Cretaceous. Here, we present climate model simulations of the Cenomanian (100.5-93.9 Ma) and Maastrichtian (72.1-66.1 Ma) stages of the Cretaceous with the CCSM4 earth system model. We focus on intermediate (500-1500 m) and deep (> 1500 m) ocean circulation and show that while there is continuous deep-water production in the southwestern Pacific, major circulation changes occur between the Cenomanian and Maastrichtian. Opening of the Atlantic and Southern Ocean, in particular, drives a transition from a mostly zonal circulation to enhanced meridional exchange. Using additional experiments to test the effect of deepening of major ocean gateways in the Maastrichtian, we demonstrate that the geometry of these gateways likely had a considerable impact on ocean circulation. We further compare simulated circulation results with compilations of span classCombining double low line"inline-formula"iϵ/iNd/span records and show that simulated changes in Late Cretaceous ocean circulation are reasonably consistent with proxy-based inferences. In our simulations, consistency with the geologic history of major ocean gateways and absence of shift in areas of deep-water formation suggest that Late Cretaceous trends in span classCombining double low line"inline-formula"iϵ/iNd/span values in the Atlantic and southern Indian oceans were caused by the subsidence of volcanic provinces and opening of the Atlantic and Southern oceans rather than changes in deep-water formation areas and/or reversal of deep-water fluxes. However, the complexity in interpreting Late Cretaceous span classCombining double low line"inline-formula"iϵ/iNd/span values underscores the need for new records as well as specific span classCombining double low line"inline-formula"iϵ/iNd/span modeling to better discriminate between the various plausible theories of ocean circulation change during this period. © Author(s) 2020.
语种	英语
scopus关键词	Cenomanian; climate modeling; Cretaceous; deep water; Maastrichtian; oceanic circulation; paleoceanography; paleogeography; Atlantic Ocean; Indian Ocean; Indian Ocean (South); Pacific Ocean; Pacific Ocean (Southwest); Southern Ocean
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/146707
作者单位	Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States; Institut de Physique du Globe de Paris, Université de Paris, CNRS, Paris, 75005, France; Department of Geosciences, University of Connecticut, Storrs, CT, United States; Department of Geological Sciences, University of Missouri, Columbia, MO, United States; Department of Geosciences, University of Florida, Williamson Hall 362, Gainesville, FL, United States; Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ, United States; Ecology, Evolution and Conservation Biology Department, University of Nevada, Reno, NV, United States
推荐引用方式 GB/T 7714	Ladant J.-B.,Poulsen C.J.,Fluteau F.,et al. Paleogeographic controls on the evolution of Late Cretaceous ocean circulation[J],2020,16(3).
APA	Ladant J.-B..,Poulsen C.J..,Fluteau F..,Tabor C.R..,Macleod K.G..,...&Rostami M.A..(2020).Paleogeographic controls on the evolution of Late Cretaceous ocean circulation.Climate of the Past,16(3).
MLA	Ladant J.-B.,et al."Paleogeographic controls on the evolution of Late Cretaceous ocean circulation".Climate of the Past 16.3(2020).