High Spatial Melt Rate Variability Near the Totten Glacier Grounding Zone Explained by New Bathymetry Inversion

High Spatial Melt Rate Variability Near the Totten Glacier Grounding Zone Explained by New Bathymetry Inversion
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新的测深反演解释了托滕冰川接地区附近的高空间融化速率变化

DOI:
10.1029/2023gl102960
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发表时间:
2023
影响因子:
5.2
通讯作者:
Galton‐Fenzi, Benjamin K.
Galton‐Fenzi, Benjamin K.
中科院分区:
地球科学1区
文献类型:
--
作者:
Vaňková, Irena;Winberry, J. Paul;Cook, Sue;Nicholls, Keith W.;Greene, Chad A.;Galton‐Fenzi, Benjamin K.

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Totten Glacier是一个快速移动的东南极出口,有可能对未来的海平面产生重大影响。我们在其冰架上部署了四个自主相敏雷达,以监测其接地区附近的冰-海洋相互作用,并进行主动源地震观测,以约束重力导出的测深模型。我们观察到一个不对称的基础熔化与平均熔化率沿着接地区的差异高达20米/年。我们新的测深模型表明,这种融化速率的不对称性与水柱厚度的不对称性相一致,并且低融化冰架部分被主空腔环流屏蔽。2年的记录产生每年7-9 m/a的融化速率变化,没有季节性周期。我们的研究结果强调了接地线附近的水深测量对于准确模拟冰架融化的关键作用,以及持续多年监测的重要性,特别是在冰架空腔中,主要的融化速率驱动因素主要在每年之间变化。
Totten Glacier is a fast‐moving East Antarctic outlet with the potential for significant future sea‐level contributions. We deployed four autonomous phase‐sensitive radars on its ice shelf to monitor ice‐ocean interactions near its grounding zone and made active source seismic observations to constrain gravity‐derived bathymetry models. We observe an asymmetry in basal melting with mean melt rates along the grounding zone differing by up to 20 m/a. Our new bathymetry model reveals that this melt rate asymmetry coincides with an asymmetry in water column thickness and that the low‐melting ice‐shelf portion is shielded from the main cavity circulation. A 2‐year record yields year‐to‐year melt rate variability of 7–9 m/a with no seasonal cycle. Our results highlight the key role of bathymetry near grounding lines for accurate modeling of ice‐shelf melt, and the importance of sustained multi‐year monitoring, especially at ice‐shelf cavities where the dominant melt rate drivers vary primarily inter‐annually.
DOI: 10.1038/s41586-022-05586-0
发表时间: 2023-02
期刊: NATURE
影响因子: 64.8
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DOI: 10.1029/2022jc018879
发表时间: 2022
期刊: Journal of Geophysical Research: Oceans
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影响因子: 18.3
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DOI: 10.1029/2021gl092692
发表时间: 2021
影响因子: 5.2
作者:
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