Direct measurement of warm Atlantic Intermediate Water close to the grounding line of Nioghalvfjerdsfjorden (79° N) Glacier, northeast Greenland

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-05-05 DOI:10.5194/tc-17-1821-2023
M. J. Bentley, James A. Smith, S. Jamieson, M. Lindeman, B. Rea, A. Humbert, T. Lane, C. Darvill, J. Lloyd, F. Straneo, V. Helm, D. Roberts
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引用次数: 5

Abstract

Abstract. The Northeast Greenland Ice Stream has recently seen significant change to its floating margins and has been identified as vulnerable to future climate warming. Inflow of warm Atlantic Intermediate Water (AIW) from the continental shelf has been observed in the vicinity of the Nioghalvfjerdsfjorden (79∘ N) Glacier calving front, but AIW penetration deep into the ice shelf cavity has not been observed directly. Here, we report temperature and salinity measurements from profiles in an epishelf lake, which provide the first direct evidence of AIW proximal to the grounding line of 79∘ N Glacier, over 50 km from the calving front. We also report evidence for partial un-grounding of the margin of 79∘ N Glacier taking place at the western end of the epishelf lake. Comparison of our measurements to those close to the calving front shows that AIW transits the cavity to reach the grounding line within a few months. The observations provide support for modelling studies that infer AIW-driven basal melt proximal to the grounding line and demonstrate that offshore oceanographic changes can be rapidly transmitted throughout the sub-ice-shelf cavity, with implications for near-future stability of the ice stream.
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Nioghalvfjerdsfjorden接地线附近温暖的大西洋中间水的直接测量(79° N) 格陵兰东北部冰川
摘要格陵兰东北冰流的漂浮边缘最近发生了重大变化,并被确定为易受未来气候变暖的影响。在Nioghalvfjerdsfjorden(79∘ N) 冰川崩解前沿,但尚未直接观察到AIW深入冰架空腔。在这里,我们报告了从阿涅皮舍尔夫湖剖面中测量的温度和盐度,这提供了接近79∘地线的AIW的第一个直接证据 N冰川,超过50 距离卡尔文前线公里。我们还报告了79∘的边缘部分不接地的证据 N冰川发生在epishelflake的西端。我们的测量结果与靠近产裂前沿的测量结果的比较表明,AIW在几个月内穿过空腔到达接地线。这些观测结果为模型研究提供了支持,这些研究推断了接地线附近由海浪驱动的基底融化,并证明近海海洋变化可以迅速传递到整个冰架下洞穴,这对冰流近期的稳定性有影响。
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来源期刊
Cryosphere
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.
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