气候变化领域集成服务门户(CCPortal): Advection and non-climate impacts on the South Pole Ice Core

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DOI	10.5194/cp-16-819-2020
	Advection and non-climate impacts on the South Pole Ice Core
	J. Fudge T.; A. Lilien D.; Koutnik M.; Conway H.; Max Stevens C.; D. Waddington E.; J. Steig E.; J. Schauer A.; Holschuh N.
发表日期	2020
ISSN	18149324
起始页码	819
结束页码	832
卷号	16 期号:3
英文摘要	The South Pole Ice Core (SPICEcore), which spans the past 54 300 years, was drilled far from an ice divide such that ice recovered at depth originated upstream of the core site. If the climate is different upstream, the climate history recovered from the core will be a combination of the upstream conditions advected to the core site and temporal changes. Here, we evaluate the impact of ice advection on two fundamental records from SPICEcore: accumulation rate and water isotopes. We determined past locations of ice deposition based on GPS measurements of the modern velocity field spanning 100 km upstream, where ice of 20 ka age would likely have originated. Beyond 100 km, there are no velocity measurements, but ice likely originates from Titan Dome, an additional 90 km distant. Shallow radar measurements extending 100 km upstream from the core site reveal large ( 20 %) variations in accumulation but no significant trend.Water isotope ratios, measured at 12.5 km intervals for the first 100 km of the flowline, show a decrease with elevation of 0:00m1 for 18O. Advection adds approximately 1 for 18O to the Last Glacial Maximum (LGM)- to-modern change. We also use an existing ensemble of continental ice-sheet model runs to assess the ice-sheet elevation change through time. The magnitude of elevation change is likely small and the sign uncertain. Assuming a lapse rate of 10 C km1 of elevation, the inference of LGM-to-modern temperature change is 1:4 C smaller than if the flow from upstream is not considered. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	accumulation rate; advection; elevation; field method; GPS; high temperature; ice core; ice sheet; isotopic analysis; Last Glacial Maximum; measurement method; radar; temporal variation; Antarctica; East Antarctica; South Pole
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/146715
作者单位	Earth and Space Sciences, University of Washington, Seattle, WA 98195, United States; Physics of Ice Climate and Earth, Niels Bohr Institute, Copenhagen, Denmark; Department of Geology, Amherst College, Amherst, MA 01002, United States
推荐引用方式 GB/T 7714	J. Fudge T.,A. Lilien D.,Koutnik M.,et al. Advection and non-climate impacts on the South Pole Ice Core[J],2020,16(3).
APA	J. Fudge T..,A. Lilien D..,Koutnik M..,Conway H..,Max Stevens C..,...&Holschuh N..(2020).Advection and non-climate impacts on the South Pole Ice Core.Climate of the Past,16(3).
MLA	J. Fudge T.,et al."Advection and non-climate impacts on the South Pole Ice Core".Climate of the Past 16.3(2020).