气候变化领域集成服务门户(CCPortal): Evidence for fire in the pliocene arctic in response to amplified temperature

CCPortal

DOI	10.5194/cp-15-1063-2019
	Evidence for fire in the pliocene arctic in response to amplified temperature
	Fletcher T.L.; Warden L.; Damsté J.S.S.; Brown K.J.; Rybczynski N.; Gosse J.C.; Ballantyne A.P.
发表日期	2019
ISSN	18149324
起始页码	1063
结束页码	1081
卷号	15 期号:3
英文摘要	The mid-Pliocene is a valuable time interval for investigating equilibrium climate at current atmospheric CO2 concentrations because atmospheric CO2 concentrations are thought to have been comparable to the current day and yet the climate and distribution of ecosystems were quite different. One intriguing, but not fully understood, feature of the early to mid-Pliocene climate is the amplified Arctic temperature response and its impact on Arctic ecosystems. Only the most recent models appear to correctly estimate the degree of warming in the Pliocene Arctic and validation of the currently proposed feedbacks is limited by scarce terrestrial records of climate and environment. Here we reconstruct the summer temperature and fire regime from a subfossil fenpeat deposit on west-central Ellesmere Island, Canada, that has been chronologically constrained using cosmogenic nuclide burial dating to 3.9+1.5=-0.5 Ma. The estimate for average mean summer temperature is 15.4±0.8 °C using specific bacterial membrane lipids, i.e., branched glycerol dialkyl glycerol tetraethers. This is above the proposed threshold that predicts a substantial increase in wildfire in the modern high latitudes. Macro-charcoal was present in all samples from this Pliocene section with notably higher charcoal concentration in the upper part of the sequence. This change in charcoal was synchronous with a change in vegetation that included an increase in abundance of fire-promoting Pinus and Picea. Paleo-vegetation reconstructions are consistent with warm summer temperatures, relatively low summer precipitation and an incidence of fire comparable to fire-adapted boreal forests of North America and central Siberia. To our knowledge, this site provides the northernmost evidence of fire during the Pliocene. It suggests that ecosystem productivity was greater than in the present day, providing fuel for wildfires, and that the climate was conducive to the ignition of fire during this period. The results reveal that interactions between paleo-vegetation and paleoclimate were mediated by fire in the High Arctic during the Pliocene, even though CO2 concentrations were similar to modern values. © 2019 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	bacterium; boreal forest; carbon dioxide; charcoal; concentration (composition); coniferous tree; deciduous tree; lipid; paleoclimate; peatland; Pliocene; subfossil; temperature profile; wildfire; Arctic; Canada; Ellesmere Island; Nunavut; Queen Elizabeth Islands; Siberia; Bacteria (microorganisms); Picea
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/146810
作者单位	College of Forestry and Conservation, University of Montana, Missoula, MT 59812, United States; Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning, 110164, China; Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research (North Holland), Utrecht University, P.O. Box 59, Den Burg, Utrecht, 1790 AB, Netherlands; Department of Earth Sciences, Faculty of Geosciences, University of Utrecht, Utrecht, 3508, Netherlands; Canadian Forest Service, Natural Resources Canada, Victoria, BC V8Z 1M5, Canada; Department of Earth, Environmental and Geographic Science, University of British Columbia Okanagan, Kelowna, BC V1V 1V7, Canada; Department of Palaeobiology, Canadian Museum of Nature, Ottawa, ON K1P 6P4, Canada; Department of Biology and Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada; Department of Earth Sciences, Dalhousie University, Halifax, NS B3H 4R2, Canada
推荐引用方式 GB/T 7714	Fletcher T.L.,Warden L.,Damsté J.S.S.,et al. Evidence for fire in the pliocene arctic in response to amplified temperature[J],2019,15(3).
APA	Fletcher T.L..,Warden L..,Damsté J.S.S..,Brown K.J..,Rybczynski N..,...&Ballantyne A.P..(2019).Evidence for fire in the pliocene arctic in response to amplified temperature.Climate of the Past,15(3).
MLA	Fletcher T.L.,et al."Evidence for fire in the pliocene arctic in response to amplified temperature".Climate of the Past 15.3(2019).