气候变化领域集成服务门户(CCPortal): SAR-derived flow velocity and its link to glacier surface elevation change and mass balance

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DOI	10.1016/j.rse.2021.112343
	SAR-derived flow velocity and its link to glacier surface elevation change and mass balance
	Samsonov S.; Tiampo K.; Cassotto R.
发表日期	2021
ISSN	00344257
卷号	258
英文摘要	Modern remote sensing techniques, such as Synthetic Aperture Radar (SAR), can measure the direction and intensity of glacier flow. Yet the question remains as to what these measurements reveal about glaciers' adjustment to the warming climate. Here, we present a technique that addresses this question by linking the SAR-derived velocity measurements with the glacier elevation change and the specific mass balance (i.e. mass balance per unit area). The technique computes the speckle offset tracking results from the north, east and vertical flow displacement time series, with the vertical component further split into a Surface Parallel Flow (SPF) advection component due to the motion along a glacier surface slope and a non-Surface Parallel Flow (nSPF). The latter links the glacier surface elevation change with the specific mass balance and strain rates. We apply this technique to ascending and descending Sentinel-1 data to derive the four-dimensional flow displacement time series for glaciers in southeast Alaska during 2016–2019. Time series extracted for a few characteristic regions demonstrate remarkable temporal variability in flow velocities. The seasonal signal observed in the nSPF component is modeled using the Positive Degree Day model. This method can be used for computing either mass balance or glacier surface elevation change if one of these two parameters is known from external observations. © 2021
语种	英语
scopus关键词	Flow velocity; Motion tracking; Remote sensing; Strain rate; Synthetic aperture radar; Time series; Characteristic regions; Degree-day model; Displacement time series; Offset tracking; Remote sensing techniques; Surface elevation changes; Temporal variability; Vertical component; Parallel flow; advection; flow velocity; glacier; mass balance; remote sensing; speckle; synthetic aperture radar; temporal analysis; time series; Alaska; United States
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178897
作者单位	Canada Centre for Mapping and Earth Observation, Natural Resources Canada, 560 Rochester Street, Ottawa, ON K1S5K2, Canada; Earth Science & Observation Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States
推荐引用方式 GB/T 7714	Samsonov S.,Tiampo K.,Cassotto R.. SAR-derived flow velocity and its link to glacier surface elevation change and mass balance[J],2021,258.
APA	Samsonov S.,Tiampo K.,&Cassotto R..(2021).SAR-derived flow velocity and its link to glacier surface elevation change and mass balance.Remote Sensing of Environment,258.
MLA	Samsonov S.,et al."SAR-derived flow velocity and its link to glacier surface elevation change and mass balance".Remote Sensing of Environment 258(2021).