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DOI | 10.1002/2017GL075579 |
Spatially Variable Geothermal Heat Flux in West Antarctica: Evidence and Implications | |
Begeman, Carolyn Branecky; Tulaczyk, Slawek M.; Fisher, Andrew T. | |
2017-10-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:19 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Geothermal heat flux (GHF) is an important part of the basal heat budget of continental ice sheets. The difficulty of measuring GHF below ice sheets has directly hindered progress in the understanding of ice sheet dynamics. We present a new GHF measurement from below the West Antarctic Ice Sheet, made in subglacial sediment near the grounding zone of the Whillans Ice Stream. The measured GHF is 88 +/- 7 mW m(-2), a relatively high value compared to other continental settings and to other GHF measurements along the eastern Ross Sea of 55 mW m(-2) and 69 +/- 21 mW m(-2) but within the range of regional values indicated by geophysical estimates. The new GHF measurement was made similar to 100km from the only other direct GHF measurement below the ice sheet, which was considerably higher at 285 +/- 80 mW m(-2), suggesting spatial variability that could be explained by shallow magmatic intrusions or the advection of heat by crustal fluids. Analytical calculations suggest that spatial variability in GHF exceeds spatial variability in the conductive heat flux through ice along the Siple Coast. Accurate GHF measurements and high-resolution GHF models may be necessary to reliably predict ice sheet evolution, including responses to ongoing and future climate change. |
英文关键词 | geothermal West Antarctic Ice Sheet heat flux cryosphere ice stream WISSARD |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413921300035 |
WOS关键词 | ICE-SHEET ; OCEANIC-CRUST ; HYDROTHERMAL CIRCULATION ; THERMAL REGIME ; RIDGE FLANK ; RIFT SYSTEM ; SIPLE DOME ; FLOW ; BENEATH ; SURFACE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25605 |
专题 | 气候变化 |
作者单位 | Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA |
推荐引用方式 GB/T 7714 | Begeman, Carolyn Branecky,Tulaczyk, Slawek M.,Fisher, Andrew T.. Spatially Variable Geothermal Heat Flux in West Antarctica: Evidence and Implications[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(19). |
APA | Begeman, Carolyn Branecky,Tulaczyk, Slawek M.,&Fisher, Andrew T..(2017).Spatially Variable Geothermal Heat Flux in West Antarctica: Evidence and Implications.GEOPHYSICAL RESEARCH LETTERS,44(19). |
MLA | Begeman, Carolyn Branecky,et al."Spatially Variable Geothermal Heat Flux in West Antarctica: Evidence and Implications".GEOPHYSICAL RESEARCH LETTERS 44.19(2017). |
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