气候变化领域集成服务门户(CCPortal): The SP19 chronology for the South Pole Ice Core - Part 2: Gas chronology, Δage, and smoothing of atmospheric records

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DOI	10.5194/cp-16-2431-2020
	The SP19 chronology for the South Pole Ice Core - Part 2: Gas chronology, Δage, and smoothing of atmospheric records
	Epifanio J.A.; Brook E.J.; Buizert C.; Edwards J.S.; Sowers T.A.; Kahle E.C.; Severinghaus J.P.; Steig E.J.; Winski D.A.; Osterberg E.C.; Fudge T.J.; Aydin M.; Hood E.; Kalk M.; Kreutz K.J.; Ferris D.G.; Kennedy J.A.
发表日期	2020
ISSN	1814-9324
卷号	16 期号:6
英文摘要	A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements a previous paper (Winski et al., 2019) describing the SP19 ice chronology. The gas chronology is based on a discrete methane (CH4) record with 20- to 190-year resolution. To construct the gas timescale, abrupt changes in atmospheric CH4during the glacial period and centennial CH4variability during the Holocene were used to synchronize the South Pole gas record with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching based on visual optimization was verified using an automated matching algorithm. The South Pole ice core recovers all expected changes in CH4based on previous records. Gas transport in the firn results in smoothing of the atmospheric gas record with a smoothing function spectral width that ranges from 30 to 78 years, equal to 3% of the gas-age-ice-age difference, or Δage. The new gas chronology, in combination with the existing ice age scale from Winski et al. (2019), allows a model-independent reconstruction of the gas-age-ice-age difference through the whole record, which will be useful for testing firn densification models. © 2020 BMJ Publishing Group. All rights reserved.
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/183631
作者单位	College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; Department of Earth and Space Science, University of Washington, Seattle, WA, United States; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA, United States; School of Earth and Climate Sciences, University of Maine, Orono, ME, United States; Climate Change Institute, University of Maine, Orono, ME, United States; Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Department of Earth System Science, University of California, Irvine, CA, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD, United States
推荐引用方式 GB/T 7714	Epifanio J.A.,Brook E.J.,Buizert C.,et al. The SP19 chronology for the South Pole Ice Core - Part 2: Gas chronology, Δage, and smoothing of atmospheric records[J],2020,16(6).
APA	Epifanio J.A..,Brook E.J..,Buizert C..,Edwards J.S..,Sowers T.A..,...&Kennedy J.A..(2020).The SP19 chronology for the South Pole Ice Core - Part 2: Gas chronology, Δage, and smoothing of atmospheric records.Climate of the Past,16(6).
MLA	Epifanio J.A.,et al."The SP19 chronology for the South Pole Ice Core - Part 2: Gas chronology, Δage, and smoothing of atmospheric records".Climate of the Past 16.6(2020).