DOI: 10.5194/tc-14-4021-2020
论文题名: Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica
作者: Talalay P. ; Li Y. ; Augustin L. ; Clow G.D. ; Hong J. ; Lefebvre E. ; Markov A. ; Motoyama H. ; Ritz C.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 4021
结束页码: 4037
语种: 英语
英文关键词: borehole
; correlation
; drilling
; flow modeling
; freezing
; heat flow
; heat flux
; ice core
; ice sheet
; steady-state equilibrium
; temperature gradient
; temperature profile
; thermodynamics
; Antarctic Ice Sheet
; Antarctica
; Dome Concordia
; East Antarctic Ice Sheet
; East Antarctica
; Lake Vostok
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: The temperature at the Antarctic Ice Sheet bed and the temperature gradient in subglacial rocks have been directly measured only a few times, although extensive thermodynamic modeling has been used to estimate the geothermal heat flux (GHF) under the ice sheet. During the last 5 decades, deep ice-core drilling projects at six sites Byrd, WAIS Divide, Dome C, Kohnen, Dome F, and Vostok have succeeded in reaching or nearly reaching the bed at inland locations in Antarctica. When temperature profiles in these boreholes and steady-state heat flow modeling are combined with estimates of vertical velocity, the heat flow at the ice-sheet base is translated to a geothermal heat flux of 57.96.4mWm2 at Dome C, 78.95.0mWm2 at Dome F, and 86.916.6mWm2 at Kohnen, all higher than the predicted values at these sites. This warm base under the East Antarctic Ice Sheet (EAIS) could be caused by radiogenic heat effects or hydrothermal circulation not accounted for by the models. The GHF at the base of the ice sheet at Vostok has a negative value of 3.65.3mWm2, indicating that water from Lake Vostok is freezing onto the ice-sheet base. Correlation analyses between modeled and measured depth age scales at the EAIS sites indicate that all of them can be adequately approximated by a steadystate model. Horizontal velocities and their variation over ice-Age cycles are much greater for the West Antarctic Ice Sheet than for the interior EAIS sites; a steady-state model cannot precisely describe the temperature distribution here. Even if the correlation factors for the best fitting age depth curve are only moderate for the West Antarctic sites, the GHF values estimated here of 88.47.6mWm2 at Byrd and 113.316.9mWm2 at WAIS Divide can be used as references before more precise estimates are made on the subject. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164597
Appears in Collections: 气候变化与战略
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作者单位: Polar Research Center, Institute for Polar Science and Engineering, Jilin University, Changchun, 130021, China; Division Technique de l'Insu, Cnrs, La Seyne sur Mer, 83507, France; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Université Grenoble Alpes, CNRS, IRD, Ige, Grenoble, 38000, France; National Institute of Polar Research, Tokyo, Japan
Recommended Citation:
Talalay P.,Li Y.,Augustin L.,et al. Geothermal heat flux from measured temperature profiles in deep ice boreholes in Antarctica[J]. Cryosphere,2020-01-01,14(11)