德龙宁毛德皇后地芬布尔冰架冰隆在过去一千年中的演变

IF 1.8 4区 地球科学 Q3 ENVIRONMENTAL SCIENCES
Vikram Goel, Carlos Martín, Kenichi Matsuoka
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引用次数: 0

摘要

我们研究了南极洲东部芬布尔冰架上的两个冰隆,即 Kupol Moskovskij 冰隆和 Kupol Ciolkovskogo 冰隆,这两个冰隆相距约 60 千米,但在冰川学环境上有所不同。我们将热机械耦合的埃尔默/冰模型应用于穿越这些冰隆的剖面,并利用该模型研究它们从现在到几千年前的演变过程。我们利用实地测量数据(包括表面速度测量数据)和通过等时雷达地层学估算的表面质量平衡,以及枞树岩芯的年代,对模型结果进行了约束。我们发现,冰隆目前(2012-2014 年)正在增厚,这是近几十年才开始的。对深层雷达反射体的研究表明,过去两个冰隆的地表质量平衡存在更强烈的上风-下风对比,具体情况各不相同。这一结果与之前在同属芬布尔冰架的布拉斯基门岛冰隆上发现的结果相吻合。此外,位于剪切边缘的 Kupol Moskovskij 冰隆的冰裂位置最近有变化的迹象,而 Kupol Ciolkovskogo 冰隆的冰裂位置则比较稳定。这项研究强调了地表质量平衡对冰隆的长期影响,以及当地冰川环境对冰隆演变的巨大影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of ice rises in the Fimbul Ice Shelf, Dronning Maud Land, over the last millennium

We investigate two ice rises, Kupol Moskovskij and Kupol Ciolkovskogo, in the Fimbul Ice Shelf, East Antarctica, situated ~60 km from each other but differing in their glaciological settings. We apply a thermo-mechanically coupled Elmer/Ice model to profiles going across these ice rises and use it to investigate their past evolution covering present to several millennia ago. We constrain the model results using field measurements, including surface-velocity measurements, and surface mass balance estimated by isochronous radar stratigraphy dated with firn cores. We find that the ice rises are thickening at present (2012–2014), which started only in recent decades. Investigation of deeper radar reflectors suggests a stronger upwind-downwind contrast in surface mass balance in the past for both ice rises, with varying details. This result matches what was previously found on Blåskimen Island ice rise, which is also in the Fimbul Ice Shelf. Moreover, Kupol Moskovskij, situated at a shear margin, shows signs of recent changes in its ice-divide position, while Kupol Ciolkovskogo shows a more stable divide position. This study highlights the long-term influence of surface mass balance on ice rises, as well as the strong influence of local glaciological settings on their evolution.

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来源期刊
Antarctic Science
Antarctic Science 地学-地球科学综合
CiteScore
3.60
自引率
6.20%
发文量
42
审稿时长
3 months
期刊介绍: Antarctic Science provides a truly international forum for the broad spread of studies that increasingly characterise scientific research in the Antarctic. Whilst emphasising interdisciplinary work, the journal publishes papers from environmental management to biodiversity, from volcanoes to icebergs, and from oceanography to the upper atmosphere. No other journal covers such a wide range of Antarctic scientific studies. The journal attracts papers from all countries currently undertaking Antarctic research. It publishes both review and data papers with no limits on length, two-page short notes on technical developments and recent discoveries, and book reviews. These, together with an editorial discussing broader aspects of science, provide a rich and varied mixture of items to interest researchers in all areas of science. There are no page charges, or charges for colour, to authors publishing in the Journal. One issue each year is normally devoted to a specific theme or papers from a major meeting.
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