Offshore-onshore record of Last Glacial Maximum–to–present grounding line retreat at Pine Island Glacier, Antarctica
Offshore-onshore record of Last Glacial Maximum–to–present grounding line retreat at Pine Island Glacier, Antarctica
复制标题
南极洲松岛冰川末次盛冰期至目前接地线退缩的近海-陆上记录
DOI：
10.1130/g51326.1
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发表时间：
2023
期刊：
影响因子：
5.8
通讯作者：
Wilcken, Klaus
中科院分区：
文献类型：
--
作者：
Nichols, Keir A.;Rood, Dylan H.;Venturelli, Ryan A.;Balco, Greg;Adams, Jonathan R.;Guillaume, Louise;Campbell, Seth;Goehring, Brent M.;Hall, Brenda L.;Wilcken, Klaus
南极西部的松岛冰川是南极对全球海平面上升的最大贡献者，容易受到快速退缩的影响，但我们对其自末次盛冰期以来的冰川消融历史的了解主要基于海洋沉积物，这些沉积物记录了在全新世早期结束的退缩历史。利用与松岛冰川直接相邻的陆上冰川沉积物的一套10be暴露年龄，我们表明该主要冰川在全新世早期至中期迅速变薄。结果表明，在约8 ka之前，松岛冰川的厚度至少比现在厚690 m。我们推断，在最下游站点检测到的快速变薄记录了该站点后退接地线的到达和稳定，时间为8-6 ka。通过结合我们的暴露年龄和海洋记录，我们扩展了松岛冰川在空间和时间上的退缩知识：从现代接地线到全新世中期50公里，为未来的数值冰盖模型验证提供了重要的数据集。
Pine Island Glacier, West Antarctica, is the largest Antarctic contributor to global sea-level rise and is vulnerable to rapid retreat, yet our knowledge of its deglacial history since the Last Glacial Maximum is based largely on marine sediments that record a retreat history ending in the early Holocene. Using a suite of10Be exposure ages from onshore glacial deposits directly adjacent to Pine Island Glacier, we show that this major glacier thinned rapidly in the early to mid-Holocene. Our results indicate that Pine Island Glacier was at least 690 m thicker than present prior to ca. 8 ka. We infer that the rapid thinning detected at the site farthest downstream records the arrival and stabilization of the retreating grounding line at that site by 8–6 ka. By combining our exposure ages and the marine record, we extend knowledge of Pine Island Glacier retreat both spatially and temporally: to 50 km from the modern grounding line and to the mid-Holocene, providing a data set that is important for future numerical ice-sheet model validation.