期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 19, 页码 9778-9785出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL074917
关键词
-
资金
- National Science Foundation [1203451]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1203451, 1203418] Funding Source: National Science Foundation
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据