气候变化领域集成服务门户(CCPortal): Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures

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DOI	10.5194/cp-16-299-2020
	Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures
	Sánchez-Montes M.L.; McClymont E.L.; Lloyd J.M.; Müller J.; Cowan E.A.; Zorzi C.
发表日期	2020
ISSN	18149324
起始页码	299
结束页码	313
卷号	16 期号:1
英文摘要	The initiation and evolution of the Cordilleran Ice Sheet are relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses alongside ice-rafted debris (IRD), terrigenous, and marine organic matter inputs to the GOA through the late Pliocene and early Pleistocene. The first IRD contribution from tidewater glaciers in southwest Alaska is recorded at 2.9 Ma, indicating that the Cordilleran Ice Sheet extent increased in the late Pliocene. A higher occurrence of IRD and higher sedimentation rates in the GOA during the early Pleistocene, at 2.5 Ma, occur in synchrony with SSTs warming on the order of 1 °C relative to the Pliocene. All records show a high degree of variability in the early Pleistocene, indicating highly efficient ocean-climate-ice interactions through warm SST-ocean evaporation-orographic precipitation-ice growth mechanisms. A climatic shift towards ocean circulation in the subarctic Pacific similar to the pattern observed during negative Pacific Decadal Oscillation (PDO) conditions today occurs with the development of more extensive Cordilleran glaciation and may have played a role through increased moisture supply to the subarctic Pacific. The drop in atmospheric CO2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation. © Author(s) 2020.
语种	英语
scopus关键词	Cordilleran Ice Sheet; glaciation; ice-ocean interaction; ice-rafted debris; organic matter; Pacific Decadal Oscillation; Pliocene; Pliocene-Pleistocene boundary; sea surface temperature; sedimentation rate; tidewater glacier; Gulf of Alaska; Pacific Ocean; Pacific Ocean; Pacific 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/146744
作者单位	Geography Department, Durham University, Durham, DH1 3LE, United Kingdom; School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany; Faculty of Geosciences, MARUM Research Faculty, University of Bremen, Bremen, 28359, Germany; Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC 28608, United States; GEOTOP, Université du Québec À Montréal, Montreal, H3C 3P8, Canada
推荐引用方式 GB/T 7714	Sánchez-Montes M.L.,McClymont E.L.,Lloyd J.M.,et al. Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures[J],2020,16(1).
APA	Sánchez-Montes M.L.,McClymont E.L.,Lloyd J.M.,Müller J.,Cowan E.A.,&Zorzi C..(2020).Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures.Climate of the Past,16(1).
MLA	Sánchez-Montes M.L.,et al."Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures".Climate of the Past 16.1(2020).