气候变化领域集成服务门户(CCPortal): Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method

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DOI	10.1029/2020JD033300
	Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method
	Kahle E.C.; Steig E.J.; Jones T.R.; Fudge T.J.; Koutnik M.R.; Morris V.A.; Vaughn B.H.; Schauer A.J.; Stevens C.M.; Conway H.; Waddington E.D.; Buizert C.; Epifanio J.; White J.W.C.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:13
英文摘要	Data from the South Pole ice core (SPC14) are used to constrain climate conditions and ice-flow-induced layer thinning for the last 54,000 years. Empirical constraints are obtained from the SPC14 ice and gas timescales, used to calculate annual-layer thickness and the gas-ice age difference (Δage), and from high-resolution measurements of water isotopes, used to calculate the water-isotope diffusion length. Both Δage and diffusion length depend on firn properties and therefore contain information about past temperature and snow-accumulation rate. A statistical inverse approach is used to obtain an ensemble of reconstructions of temperature, accumulation-rate, and thinning of annual layers in the ice sheet at the SPC14 site. The traditional water-isotope/temperature relationship is not used as a constraint; the results therefore provide an independent calibration of that relationship. The temperature reconstruction yields a glacial-interglacial temperature change of 6.7 ± 1.0°C at the South Pole. The sensitivity of δ18O to temperature is 0.99 ± 0.03 ‰°C−1, significantly greater than the spatial slope of 0.8‰°C−1 that has been used previously to determine temperature changes from East Antarctic ice core records. The reconstructions of accumulation rate and ice thinning show millennial-scale variations in the thinning function as well as decreased thinning at depth compared to the results of a 1-D ice flow model, suggesting influence of bedrock topography on ice flow. © 2021. American Geophysical Union. All Rights Reserved.
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237147
作者单位	Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; College of Earth Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Kahle E.C.,Steig E.J.,Jones T.R.,et al. Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method[J],2021,126(13).
APA	Kahle E.C..,Steig E.J..,Jones T.R..,Fudge T.J..,Koutnik M.R..,...&White J.W.C..(2021).Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Kahle E.C.,et al."Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method".Journal of Geophysical Research: Atmospheres 126.13(2021).