Holocene southwest Greenland ice sheet behavior constrained by sea-level modeling
Holocene southwest Greenland ice sheet behavior constrained by sea-level modeling
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全新世格陵兰西南部冰盖行为受海平面模型限制
DOI：
10.1016/j.quascirev.2024.108553
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发表时间：
2024
影响因子：
4
通讯作者：
Latychev, Konstantin
中科院分区：
文献类型：
--
作者：
Antwerpen, Raf;Austermann, Jacqueline;Young, Nicolás;Porter, David;Lewright, Lauren;Latychev, Konstantin
格陵兰冰盖的融化是过去和未来全球海平面上升的主要原因。了解GrIS对过去温度与今天一样温暖或更温暖的时间的反应，可以深入了解其当前和未来对气候变化的反应。在西南部，GrIS在（至少在区域上）比现在更温暖的全新世中期向内陆撤退，超过了目前的边缘，然后在小冰期重新前进到历史最高位置。随后，它略微后退到目前的位置。为了研究西南GrIS撤退的时间和幅度，并在响应全新世温暖，我们模拟了固体地球和当地相对海平面（RSL）过去的冰盖变化的响应。我们测试了一套11冰盖的情况下，ICE-6G_C的基础上，但修改的时间和规模的冰退缩和再进，并将它们与四个不同的粘弹性地球结构。我们比较模型预测的古海平面，现今海平面变化，和现今的垂直陆地运动（VLM）周围的努克，格陵兰岛的观测。我们发现，模拟的时间和规模的全新世后退和再进现代海平面变化和VLM在努克有显着的影响。模型，假设一个readvance接近西南GrIS的历史最大值之间的2和1 ka是最一致的观测。然而，RSL响应对最小GrIS范围的时间不太敏感。尽管如此，更好的数据模型拟合通常获得的最小冰盖范围达到5和3 ka之间，在测试范围6-3 ka。比较这一时间的温度和冰盖变化的地方和区域记录表明，这里提出的西南GrIS的演变是同步的西南GrIS质量平衡可能的演变，通过全新世。我们的研究结果对未来针对格陵兰岛西南部的冰盖建模研究具有影响，可以提供额外的约束条件并加强现有的约束条件。此外，这项工作提供了对气候和冰冻圈之间的相互作用以及未来冰盖变化的更深入了解。
The melting of the Greenland ice sheet (GrIS) is a major contributor to past and future global sea-level rise. Understanding the response of the GrIS to times in the past when temperatures were as warm or warmer than today offers insights into its current and future response to climate change. In the southwest sector, the GrIS retreated inland beyond its current margin during the (at least regionally) warmer-than-present mid-Holocene, before it readvanced to the historical maximum position during the Little Ice Age. This was then followed by a slight retreat to its current position. To investigate the timing and magnitude of southwest GrIS retreat and readvance in response to Holocene warmth, we model the response of the solid Earth and local relative sea level (RSL) to past ice sheet change. We test a suite of eleven ice sheet scenarios that are based on ICE-6G_C but are modified in the timing and magnitude of ice retreat and readvance and pair them with four different viscoelastic Earth structures. We compare model predictions to observations of paleo sea level, present-day sea-level change, and present-day vertical land motion (VLM) around Nuuk, Greenland. We find that the modeled timing and magnitude of the Holocene retreat and readvance have a significant impact on modern sea-level change and VLM in Nuuk. Models that assume a readvance approaching the southwest GrIS’ historical maximum between 2 and 1 ka are most consistent with observations. The RSL response, however, is less sensitive to the timing of the minimum GrIS extent. Nonetheless, better data-model fits are generally obtained when the minimum ice sheet extent is reached between 5 and 3 ka, within the tested range of 6-3 ka. Comparing this timing to local and regional records of temperature and ice-sheet change suggest that the evolution of the southwestern GrIS presented here was in-phase with the likely evolution of southwestern GrIS mass balance through the Holocene. Our results have implications for future ice sheet modeling studies targeting southwestern Greenland by providing additional constraints and strengthening existing ones. Moreover, this work provides a deeper understanding of the interactions between the climate and the cryosphere and thus of future ice sheet change.
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影响因子：
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作者：
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影响因子：
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DOI：
10.5194/tc-13-879-2019
发表时间：
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