气候变化领域集成服务门户(CCPortal): Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes

CCPortal

DOI	10.5194/cp-16-1387-2020
	Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes
	West C.K.; Greenwood D.R.; Reichgelt T.; Lowe A.J.; Vachon J.M.; Basinger J.F.
发表日期	2020
ISSN	18149324
起始页码	1387
结束页码	1410
卷号	16 期号:4
英文摘要	Early Eocene climates were globally warm, with ice-free conditions at both poles. Early Eocene polar landmasses supported extensive forest ecosystems of a primarily temperate biota but also with abundant thermophilic elements, such as crocodilians, and mesothermic taxodioid conifers and angiosperms. The globally warm early Eocene was punctuated by geologically brief hyperthermals such as the Paleocene-Eocene Thermal Maximum (PETM), culminating in the Early Eocene Climatic Optimum (EECO), during which the range of thermophilic plants such as palms extended into the Arctic. Climate models have struggled to reproduce early Eocene Arctic warm winters and high precipitation, with models invoking a variety of mechanisms, from atmospheric classCombining double low CO2 levels that are unsupported by proxy evidence to the role of an enhanced hydrological cycle, to reproduce winters that experienced no direct solar energy input yet remained wet and above freezing. Here, we provide new estimates of climate and compile existing paleobotanical proxy data for upland and lowland midlatitude sites in British Columbia, Canada, and northern Washington, USA, and from high-latitude lowland sites in Alaska and the Canadian Arctic to compare climatic regimes between the middle and high latitudes of the early Eocene - spanning the PETM to the EECO - in the northern half of North America. In addition, these data are used to reevaluate the latitudinal temperature gradient in North America during the early Eocene and to provide refined biome interpretations of these ancient forests based on climate and physiognomic data. © 2020 Royal Society of Chemistry. All rights reserved.
语种	英语
scopus关键词	climate modeling; climate variation; coniferous tree; Eocene; hydrological cycle; paleobotany; paleoclimate; paleoenvironment; proxy climate record; temperature gradient; thermophily; Alaska; British Columbia; Canada; Canadian Arctic; United States; Washington [United States]; Coniferophyta; Crocodylidae (all crocodiles); Magnoliophyta
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/146688
作者单位	Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N 5E2, Canada; Department of Biology, Brandon University, 270-18th Street, Brandon, Manitoba R7A 6A9, Canada; Department of Geosciences, University of Connecticut, Beach Hall, 354 Mansfield Rd #207, Storrs, CT 06269, United States; Department of Biology, University of Washington, Seattle, WA 98195-1800, United States
推荐引用方式 GB/T 7714	West C.K.,Greenwood D.R.,Reichgelt T.,et al. Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes[J],2020,16(4).
APA	West C.K.,Greenwood D.R.,Reichgelt T.,Lowe A.J.,Vachon J.M.,&Basinger J.F..(2020).Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes.Climate of the Past,16(4).
MLA	West C.K.,et al."Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes".Climate of the Past 16.4(2020).