DOI: 10.1002/2017JD026893
论文题名: Rapid transport of ash and sulfate from the 2011 Puyehue-Cordón Caulle (Chile) eruption to West Antarctica
作者: Koffman B.G. ; Dowd E.G. ; Osterberg E.C. ; Ferris D.G. ; Hartman L.H. ; Wheatley S.D. ; Kurbatov A.V. ; Wong G.J. ; Markle B.R. ; Dunbar N.W. ; Kreutz K.J. ; Yates M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 16 起始页码: 8908
结束页码: 8920
语种: 英语
英文关键词: Antarctica
; cryptotephra
; ice cores
; Puyehue-Cordón Caulle
; volcanic eruptions
英文摘要: The Volcanic Explosivity Index 5 eruption of the Puyehue-Cordón Caulle volcanic complex (PCC) in central Chile, which began 4 June 2011, provides a rare opportunity to assess the rapid transport and deposition of sulfate and ash from a midlatitude volcano to the Antarctic ice sheet. We present sulfate, microparticle concentrations of fine-grained (~5 μm diameter) tephra, and major oxide geochemistry, which document the depositional sequence of volcanic products from the PCC eruption in West Antarctic snow and shallow firn. From the depositional phasing and duration of ash and sulfate peaks, we infer that transport occurred primarily through the troposphere but that ash and sulfate transport were decoupled. We use Hybrid Single-Particle Lagrangian Integrated Trajectory back trajectory modeling to assess atmospheric circulation conditions in the weeks following the eruption and find that conditions favored southward air parcel transport during 6–14 June and 4–18 July 2011. We suggest that two discrete pulses of cryptotephra deposition relate to these intervals, and as such, constrain the sulfate transport and deposition lifespan to the ~2–3 weeks following the eruption. Finally, we compare PCC depositional patterns to those of prominent low- and high-latitude eruptions in order to improve multiparameter-based efforts to identify “unknown source” eruptions in the ice core record. Our observations suggest that midlatitude eruptions such as PCC can be distinguished from explosive tropical eruptions by differences in ash/sulfate phasing and in the duration of sulfate deposition, and from high-latitude eruptions by differences in particle size distribution and in cryptotephra geochemical composition. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62602
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Now at Department of Geology, Colby College, Waterville, ME, United States; Climate Change Institute, University of Maine, Orono, ME, United States; School of Earth and Climate Sciences, University of Maine, Orono, ME, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; New Mexico Bureau of Geology and Mineral Resources, Socorro, NM, United States
Recommended Citation:
Koffman B.G.,Dowd E.G.,Osterberg E.C.,et al. Rapid transport of ash and sulfate from the 2011 Puyehue-Cordón Caulle (Chile) eruption to West Antarctica[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)