Multi-decadal elevation changes of the land terminating sector of West Greenland

Multi-decadal elevation changes of the land terminating sector of West Greenland
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西格陵兰陆地终止区的数十年高程变化

DOI:
10.1017/jog.2022.47
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发表时间:
2023
影响因子:
3.4
通讯作者:
Harper, Joel
Harper, Joel
中科院分区:
地球科学3区
文献类型:
--
作者:
Saito, Jun;Meierbachtol, Toby;Harper, Joel

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对冰高程变化的区域评估提供了对控制冰盖对气候强迫的几何响应的过程的深入了解。在格陵兰岛西南部的陆地终端部门(SWLTS),据推测,冰面高程的变化完全是由于改变表面质量平衡(SMB)。在这里,我们通过从数字高程模型(DEM)中开发几十年(1985-2017)高程变化记录并将其与区域气候模型输出和可用的冰速记录进行比较来测试这一假设。在整个32年期间,SWLTS平均变薄>12米,但变化在时间和空间上变化很大。相对于北部和南部,在SWLTS的中心区域,变薄被放大。在1985-2007年期间,北部和南部地区表现出净增厚,而中部地区变薄。海拔变化的区域差异与SMB异常不一致,表明北部和南部的冰流增强导致了早期的增厚。虽然南部的清晰验证因不完整的速度数据而受阻,但北部的历史表面速度有所提高。这些研究结果支持的解释,改变冰流可以影响冰面海拔缓慢移动的SWLTS。
Regional assessments of ice elevation change provide insight into the processes controlling an ice sheet's geometric response to climate forcing. In Southwest Greenland's land terminating sector (SWLTS), it is presumed that ice surface elevation changes result solely from changing surface mass balance (SMB). Here we test this assumption by developing a multi-decadal (1985–2017) record of elevation change from digital elevation models (DEMs) and comparing it to regional climate model output and available records of ice speed. The SWLTS thinned by >12 m on average over the full 32-year period, but the change was highly variable in time and space. Thinning was amplified in the central region of the SWLTS, relative to the north and south. During 1985–2007, the north and south regions demonstrated net thickening while the central region thinned. Regional differences in elevation change are inconsistent with SMB anomalies, indicating that enhanced ice flow in the north and south contributed to thickening during this early time interval. While clear validation in the south is prevented by incomplete velocity data, historical surface speeds in the north were elevated. These findings support the interpretation that changing ice flow can influence ice surface elevation in the slow-moving SWLTS.
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