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DOI | 10.1002/2017GL074917 |
Measured Horizontal Temperature Gradients Constrain Heat Transfer Mechanisms in Greenland Ice | |
Hills, Benjamin H.1; Harper, Joel T.1; Humphrey, Neil F.2; Meierbachtol, Toby W.1 | |
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 | Ice in the ablation zone of the Greenland ice sheet is known to contain vertical temperature gradients that arise from conduction at the boundaries, the addition of strain and latent heat, and advective heat transport. A three-dimensional array of temperature measurements in a grid of boreholes reveals horizontal ice temperature gradients that challenge the present conceptualization of heat transfer. We measure two distinct types of temperature variability in the horizontal direction, one impacting a confined region where ice temperatures span a range of 5 degrees C, and another with temperatures consistently varying by approximately 2 degrees C across the entire 3-D block. We suggest the first demonstrates the localized and limited nature of latent heat input, and the second demonstrates that vertical heat advection outpaces diffusion. These findings imply that ice flow is highly variable over sub-ice-thickness length scales, which in turn generates contrasts in ice temperature that may impact ice deformation and fracturing. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413921300030 |
WOS关键词 | SUPRAGLACIAL LAKE ; WESTERN GREENLAND ; FAST-FLOW ; SHEET ; DRAINAGE ; DEFORMATION ; BOREHOLES ; GLACIERS ; ISBRAE ; ZONE |
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/29137 |
专题 | 气候变化 |
作者单位 | 1.Univ Montana, Dept Geosci, Missoula, MT 59812 USA; 2.Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA |
推荐引用方式 GB/T 7714 | Hills, Benjamin H.,Harper, Joel T.,Humphrey, Neil F.,et al. Measured Horizontal Temperature Gradients Constrain Heat Transfer Mechanisms in Greenland Ice[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(19). |
APA | Hills, Benjamin H.,Harper, Joel T.,Humphrey, Neil F.,&Meierbachtol, Toby W..(2017).Measured Horizontal Temperature Gradients Constrain Heat Transfer Mechanisms in Greenland Ice.GEOPHYSICAL RESEARCH LETTERS,44(19). |
MLA | Hills, Benjamin H.,et al."Measured Horizontal Temperature Gradients Constrain Heat Transfer Mechanisms in Greenland Ice".GEOPHYSICAL RESEARCH LETTERS 44.19(2017). |
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