气候变化领域集成服务门户(CCPortal): Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems

CCPortal

DOI	10.1016/j.palaeo.2019.109564
	Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems
	Vachula R.S.; Sae-Lim J.; Russell J.M.
发表日期	2020
ISSN	0031-0182
卷号	541
英文摘要	Extensive burning of Arctic tundra landscapes in recent years has contradicted the conventional view that fire is a rare, spatially limited disturbance in tundra. These fires have been identified as harbingers of climate change, despite our limited understanding of Arctic fire frequency and climatic controls. Much of this understanding relies upon sedimentary charcoal-based fire reconstructions, yet the controls on sedimentary charcoal abundance need to be rigorously tested in tundra ecoregions. We compile published charcoal-based tundra fire reconstructions in Alaska and compare them with historical, limnological, and spatial data to: (1) evaluate the spatial and temporal characteristics of tundra fires, (2) identify the primary controls of charcoal accumulation in lake sediments, (3) assess the accuracy of peak analysis in identifying local (<1 km) fire events, and (4) constrain charcoal source area. We find that tundra fires are spatially and/or temporally dichotomous in the historical (observational) period (1940–2015 CE), a characteristic which is mimicked by charcoal accumulation rates. We show that, despite methodological differences in published studies, analyses of charcoal peaks accurately identified local (<1 km) fire events in the historical period. Further, we find that lake properties (e.g. depth and surface area) have weak influences on charcoal accumulation in the tundra and that charcoal source areas in the Alaskan tundra are much broader than in forest and grassland ecosystems. We conclude that the unique nature of tundra fire regimes allows for the reliable use of total charcoal accumulation as a fire proxy. © 2019 Elsevier B.V.
英文关键词	Arctic; Dispersal; Fire; Paleofire; Peak analysis; Source area
语种	英语
scopus关键词	burning; charcoal; climate change; dispersal; ecoregion; environmental disturbance; fire history; forest ecosystem; grassland; lacustrine deposit; proxy climate record; reconstruction; spatiotemporal analysis; tundra; Alaska; Arctic; United States
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150608
作者单位	Department of Earth, Environmental and Planetary Sciences, Box 1846, 324 Brook St., Providence, RI 02912, United States; Institute at Brown for Environment & Society, Brown University, Providence, RI 02912, United States; Department of Earth and Planetary Sciences, Washington University, 1 Brookings Drive, Campus box 1169, St. Louis, MO 63130, United States
推荐引用方式 GB/T 7714	Vachula R.S.,Sae-Lim J.,Russell J.M.. Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems[J],2020,541.
APA	Vachula R.S.,Sae-Lim J.,&Russell J.M..(2020).Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems.Palaeogeography, Palaeoclimatology, Palaeoecology,541.
MLA	Vachula R.S.,et al."Sedimentary charcoal proxy records of fire in Alaskan tundra ecosystems".Palaeogeography, Palaeoclimatology, Palaeoecology 541(2020).