Greenland and Canadian Arctic ice temperature profiles database

IF 4.4 2区地球科学 Q1 GEOGRAPHY, PHYSICAL

Cryosphere Pub Date : 2023-09-08 DOI:10.5194/tc-17-3829-2023

Anja Løkkegaard, K. Mankoff, C. Zdanowicz, G. Clow, M. Lüthi, S. Doyle, H. H. Thomsen, D. Fisher, J. Harper, A. Aschwanden, B. Vinther, D. Dahl-Jensen, H. Zekollari, T. Meierbachtol, Ian E. McDowell, N. Humphrey, A. Solgaard, N. Karlsson, S. Khan, B. Hills, R. Law, B. Hubbard, P. Christoffersen, M. Jacquemart, J. Seguinot, R. Fausto, W. Colgan

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引用次数: 4

Abstract

Abstract. Here, we present a compilation of 95 ice temperature profiles from 85 boreholes from the Greenland ice sheet and peripheral ice caps, as well as local ice caps in the Canadian Arctic. Profiles from only 31 boreholes (36 %) were previously available in open-access data repositories. The remaining 54 borehole profiles (64 %) are being made digitally available here for the first time. These newly available profiles, which are associated with pre-2010 boreholes, have been submitted by community members or digitized from published graphics and/or data tables. All 95 profiles are now made available in both absolute (meters) and normalized (0 to 1 ice thickness) depth scales and are accompanied by extensive metadata. These metadata include a transparent description of data provenance. The ice temperature profiles span 70 years, with the earliest profile being from 1950 at Camp VI, West Greenland. To highlight the value of this database in evaluating ice flow simulations, we compare the ice temperature profiles from the Greenland ice sheet with an ice flow simulation by the Parallel Ice Sheet Model (PISM). We find a cold bias in modeled near-surface ice temperatures within the ablation area, a warm bias in modeled basal ice temperatures at inland cold-bedded sites, and an apparent underestimation of deformational heating in high-strain settings. These biases provide process level insight on simulated ice temperatures.

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格陵兰岛和加拿大北极冰层温度剖面数据库

摘要在这里，我们展示了来自格陵兰冰盖和周边冰盖以及加拿大北极地区当地冰盖的85个钻孔的95个冰温度剖面的汇编。以前只有31个井眼(36%)的资料可以在开放数据存储库中获得。剩下的54个井眼剖面(64%)是第一次以数字方式提供。这些新获得的资料与2010年以前的井眼有关，由社区成员提交，或从已发布的图形和/或数据表中进行数字化。所有95条剖面现在都有绝对(米)和标准化(0到1冰厚)深度尺度，并附有大量的元数据。这些元数据包括对数据来源的透明描述。冰温剖面跨越了70年，最早的剖面是1950年在西格陵兰岛的6号营地。为了突出该数据库在评估冰流模拟中的价值，我们将格陵兰冰盖的冰温曲线与平行冰盖模型(PISM)的冰流模拟进行了比较。我们发现消融区域的近地表冰温模型存在冷偏，内陆冷层站点的基础冰温模型存在暖偏，并且在高应变环境中明显低估了变形加热。这些偏差提供了对模拟冰温度的过程级洞察力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

8.70

自引率

17.30%

发文量

240

审稿时长

4-8 weeks

期刊介绍： The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.