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Deglaciation controls on sediment yield: Towards capturing spatio-temporal variability
Earth-Science Reviews ( IF 10.8 ) Pub Date : 2021-09-10 , DOI: 10.1016/j.earscirev.2021.103809
Jonathan L. Carrivick 1 , Fiona S. Tweed 2
Affiliation  

Accelerated glacier and ice sheet retreat and thinning in recent decades has profound consequences for catchment sediment supply with attendant repercussions for nutrient cycling, carbon fluxes and natural resource management. This paper evaluates the impacts of deglaciation on sediment yields from glaciated, deglaciating and recently-deglaciated catchments. It summarises the key characteristics of sediment yields from glaciated catchments to be that they span five orders of magnitude, vary with latitude and are greatest in high-relief and tectonically-active regions. We review the available quantitative data on sediment yields from glaciated catchments and we comment extensively on spatio-temporal variability to understand global to local and inter- and intra-catchment controls. Significant gaps in the available sediment yield data and also in our knowledge of sediment sources, pathways and sinks are identified. We constrain a set of novel approaches by which these gaps could be addressed. In particular, we suggest that the opportunities presented by emerging datasets and analytical methods enabling landcover changes, Digital Elevation Model (DEM) change detection, analyses of connectivity and analyses of sediment plumes are exciting and these approaches should become practical tools for understanding intra- and inter-catchment sediment yields from deglaciating landscapes. We showcase preliminary studies utilising these datasets and they are used to formulate hypotheses designed to stimulate further research.



中文翻译:

冰消期对沉积物产量的控制:捕捉时空变化

近几十年来,冰川和冰盖加速退缩和变薄,对集水区沉积物供应产生了深远的影响,并伴随着对养分循环、碳通量和自然资源管理的影响。本文评估了冰川消融对冰川化、冰川消融和最近消融流域的沉积物产量的影响。它总结了冰川集水区沉积物产量的关键特征,即它们跨越五个数量级,随纬度变化,在高地貌和构造活跃的地区最大。我们审查了有关冰川流域沉积物产量的可用定量数据,并对时空变异性进行了广泛评论,以了解全球到局部以及流域间和流域内的控制。确定了可用沉积物产量数据以及我们对沉积物来源、途径和汇的知识的重大差距。我们限制了一组可以解决这些差距的新方法。特别是,我们建议新兴数据集和分析方法带来的机会使土地覆盖变化、数字高程模型 (DEM) 变化检测、连通性分析和沉积物羽流分析令人兴奋,这些方法应该成为理解内部和内部的实用工具。冰川消融景观中的流域间沉积物产量。我们展示了利用这些数据集的初步研究,它们被用来制定旨在刺激进一步研究的假设。我们限制了一组可以解决这些差距的新方法。特别是,我们建议新兴数据集和分析方法带来的机会使土地覆盖变化、数字高程模型 (DEM) 变化检测、连通性分析和沉积物羽流分析令人兴奋,这些方法应该成为理解内部和内部的实用工具。冰川消融景观中的流域间沉积物产量。我们展示了利用这些数据集的初步研究,它们被用来制定旨在刺激进一步研究的假设。我们限制了一组可以解决这些差距的新方法。特别是,我们建议新兴数据集和分析方法带来的机会使土地覆盖变化、数字高程模型 (DEM) 变化检测、连通性分析和沉积物羽流分析令人兴奋,这些方法应该成为理解内部和内部的实用工具。冰川消融景观中的流域间沉积物产量。我们展示了利用这些数据集的初步研究,它们被用来制定旨在刺激进一步研究的假设。连通性分析和沉积物羽流分析令人兴奋,这些方法应该成为了解冰川消融景观的流域内和流域间沉积物产量的实用工具。我们展示了利用这些数据集的初步研究,它们被用来制定旨在刺激进一步研究的假设。连通性分析和沉积物羽流分析令人兴奋,这些方法应该成为了解冰川消融景观的流域内和流域间沉积物产量的实用工具。我们展示了利用这些数据集的初步研究,它们用于制定旨在刺激进一步研究的假设。

更新日期:2021-09-21
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