Progress toward globally complete frontal ablation estimates of marine-terminating glaciers

IF 2.5 4区 地球科学 Q2 GEOGRAPHY, PHYSICAL
W. Kochtitzky, L. Copland, W. Van Wychen, R. Hock, D. Rounce, H. Jiskoot, T. Scambos, M. Morlighem, M. King, Leo Cha, Luke Gould, Paige-Marie Merrill, A. Glazovsky, R. Hugonnet, T. Strozzi, B. Noël, F. Navarro, R. Millan, J. Dowdeswell, A. Cook, A. Dalton, S. Khan, J. Jania
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引用次数: 1

Abstract

Abstract Knowledge of frontal ablation from marine-terminating glaciers (i.e., mass lost at the calving face) is critical for constraining glacier mass balance, improving projections of mass change, and identifying the processes that govern frontal mass loss. Here, we discuss the challenges involved in computing frontal ablation and the unique issues pertaining to both glaciers and ice sheets. Frontal ablation estimates require numerous datasets, including glacier terminus area change, thickness, surface velocity, density, and climatic mass balance. Observations and models of these variables have improved over the past decade, but significant gaps and regional discrepancies remain, and better quantification of temporal variability in frontal ablation is needed. Despite major advances in satellite-derived large-scale datasets, large uncertainties remain with respect to ice thickness, depth-averaged velocities, and the bulk density of glacier ice close to calving termini or grounding lines. We suggest ways in which we can move toward globally complete frontal ablation estimates, highlighting areas where we need improved datasets and increased collaboration.
全球完成海洋终止冰川锋面消融估计的进展
摘要了解海洋终止冰川的锋面消融(即冰裂面质量损失)对于约束冰川质量平衡、改善质量变化预测和确定控制锋面质量损失的过程至关重要。在这里,我们讨论了计算锋面消融所涉及的挑战,以及与冰川和冰盖有关的独特问题。锋面消融估计需要大量数据集,包括冰川终点面积变化、厚度、表面速度、密度和气候质量平衡。在过去十年中,这些变量的观测和模型有所改善,但仍存在显著差距和区域差异,需要更好地量化额叶消融的时间变异性。尽管卫星衍生的大规模数据集取得了重大进展,但在冰厚度、深度平均速度和靠近崩解终点或接地线的冰川冰体积密度方面仍然存在很大的不确定性。我们提出了在全球范围内完成额叶消融估计的方法,强调了我们需要改进数据集和加强合作的领域。
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来源期刊
Annals of Glaciology
Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.
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