DOI: 10.1073/pnas.1807172115
论文题名: Large changes in biomass burning over the last millennium inferred from paleoatmospheric ethane in polar ice cores
作者: Nicewonger M.R. ; Aydin M. ; Prather M.J. ; Saltzman E.S.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期: 49 起始页码: 12413
结束页码: 12418
语种: 英语
英文关键词: Biomass burning
; Ethane
; Geologic hydrocarbons
; Ice cores
; Little Ice Age
Scopus关键词: carbon monoxide
; charcoal
; ethane
; methane
; ethane
; Antarctica
; Article
; atmospheric transport
; biomass
; carbon footprint
; controlled study
; Greenland
; Little Ice Age
; Middle Ages
; polar ice cap
; priority journal
; biomass
; chemistry
; climate change
; human
; human activities
; ice cover
; theoretical model
; time factor
; Biomass
; Climate Change
; Ethane
; Human Activities
; Humans
; Ice Cover
; Models, Theoretical
; Time Factors
英文摘要: Biomass burning drives changes in greenhouse gases, climate-forcing aerosols, and global atmospheric chemistry. There is controversy about the magnitude and timing of changes in biomass burning emissions on millennial time scales from preindustrial to present and about the relative importance of climate change and human activities as the underlying cause. Biomass burning is one of two notable sources of ethane in the preindustrial atmosphere. Here, we present ice core ethane measurements from Antarctica and Greenland that contain information about changes in biomass burning emissions since 1000 CE (Common Era). The biomass burning emissions of ethane during the Medieval Period (1000–1500 CE) were higher than present day and declined sharply to a minimum during the cooler Little Ice Age (1600–1800 CE). Assuming that preindustrial atmospheric reactivity and transport were the same as in the modern atmosphere, we estimate that biomass burning emissions decreased by 30 to 45% from the Medieval Period to the Little Ice Age. The timing and magnitude of this decline in biomass burning emissions is consistent with that inferred from ice core methane stable carbon isotope ratios but inconsistent with histories based on sedimentary charcoal and ice core carbon monoxide measurements. This study demonstrates that biomass burning emissions have exceeded modern levels in the past and may be highly sensitive to changes in climate. © 2018 National Academy of Sciences. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163633
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Nicewonger, M.R., Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States; Aydin, M., Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States; Prather, M.J., Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States; Saltzman, E.S., Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States, Department of Chemistry, University of California, Irvine, CA 92697-3100, United States
Recommended Citation:
Nicewonger M.R.,Aydin M.,Prather M.J.,et al. Large changes in biomass burning over the last millennium inferred from paleoatmospheric ethane in polar ice cores[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(49)