气候变化领域集成服务门户(CCPortal): Rocky Mountain subalpine forests now burning more than any time in recent millennia

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DOI	10.1073/pnas.2103135118
	Rocky Mountain subalpine forests now burning more than any time in recent millennia
	Higuera P.E.; Shuman B.N.; Wolf K.D.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:25
英文摘要	The 2020 fire season punctuated a decades-long trend of increased fire activity across the western United States, nearly doubling the total area burned in the central Rocky Mountains since 1984. Understanding the causes and implications of such extreme fire seasons, particularly in subalpine forests that have historically burned infrequently, requires a long-term perspective not afforded by observational records. We place 21st century fire activity in subalpine forests in the context of climate and fire history spanning the past 2,000 y using a unique network of 20 paleofire records. Largely because of extensive burning in 2020, the 21st century fire rotation period is now 117 y, reflecting nearly double the average rate of burning over the past 2,000 y. More strikingly, contemporary rates of burning are now 22% higher than the maximum rate reconstructed over the past two millennia, during the early Medieval Climate Anomaly (MCA) (770 to 870 Common Era), when Northern Hemisphere temperatures were ∼0.3 °C above the 20th century average. The 2020 fire season thus exemplifies how extreme events are demarcating newly emerging fire regimes as climate warms. With 21st century temperatures now surpassing those during the MCA, fire activity in Rocky Mountain subalpine forests is exceeding the range of variability that shaped these ecosystems for millennia. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Climate change \| fire ecology \| wildfires \| extreme events \| paleoecology
语种	英语
scopus关键词	Article; climate change; environmental temperature; forest; Middle Ages; Northern Hemisphere; paleoecology; Rocky Mountain subalpine forest; United States; wildfire
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238709
作者单位	Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT 59812, United States; Department of Geology and Geophysics, Universityof Wyoming, Laramie, WY 82071, United States
推荐引用方式 GB/T 7714	Higuera P.E.,Shuman B.N.,Wolf K.D.. Rocky Mountain subalpine forests now burning more than any time in recent millennia[J],2021,118(25).
APA	Higuera P.E.,Shuman B.N.,&Wolf K.D..(2021).Rocky Mountain subalpine forests now burning more than any time in recent millennia.Proceedings of the National Academy of Sciences of the United States of America,118(25).
MLA	Higuera P.E.,et al."Rocky Mountain subalpine forests now burning more than any time in recent millennia".Proceedings of the National Academy of Sciences of the United States of America 118.25(2021).