气候变化领域集成服务门户(CCPortal): Influence of surface water on coarse resolution C-band backscatter: Implications for freeze/thaw retrieval from scatterometer data

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DOI	10.1016/j.rse.2020.111911
	Influence of surface water on coarse resolution C-band backscatter: Implications for freeze/thaw retrieval from scatterometer data
	Bergstedt H.; Bartsch A.; Duguay C.R.; Jones B.M.
发表日期	2020
ISSN	00344257
卷号	247
英文摘要	The freeze/thaw state of permafrost landscapes is an essential variable for monitoring ecological, hydrological and climate processes. Ground surface state can be obtained from satellite data through time series analysis of C-band backscatter from scatterometer and Synthetic Aperture Radar (SAR) observations. Scatterometer data has been used in a variety of studies concerning freeze/thaw retrieval of the land surface. Coarse spatial resolution scatterometer data has great potential for application in this field due to its high temporal resolution (approx. daily observations). In this study, we investigate the influence of sub-grid cell (12.5 km) surface water (ice free and ice covered) on freeze/thaw retrieval based on ASCAT data using a threshold algorithm. We found discrepancies related to the surface water fraction in the detected timing of thawing and freezing of up to 2 days earlier thawing for spring and 3.5 days earlier freezing for autumn for open water fractions of 40% resulting in an overestimation of the frozen season. Results of this study led to the creation of a method for correction of water fraction impact on freeze/thaw data. Additionally, this study demonstrates the applicability of a new approach to freeze/thaw retrieval which has not so far been tested for SAR, specifically Sentinel-1. © 2020
英文关键词	ASCAT; Freeze/thaw; Lake ice; SAR; Sentinel-1; Surface water
语种	英语
scopus关键词	Backscattering; Freezing; Meteorological instruments; Synthetic aperture radar; Thawing; Time series analysis; C-band backscatters; Climate process; Freeze/thaw state; Ground surfaces; High temporal resolution; Scatterometer data; Spatial resolution; Threshold algorithms; Surface waters; ASCAT; backscatter; freezing; land surface; open water; permafrost; satellite data; scatterometer; spatial resolution; surface water; synthetic aperture radar; thawing; time series analysis
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/179245
作者单位	Department of Geoinformatics Z-GIS, University Salzburg, Salzburg, Austria; Austrian Polar Research Institute, Vienna, Austria; b.geos, Korneuburg, Austria; Department of Geography and Environmental Management, Interdisciplinary Centre on Climate Change, University of Waterloo, Waterloo, ON, Canada; H2O Geomatics Inc., Waterloo, ON, Canada; Institute of Northern Engineering, Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Bergstedt H.,Bartsch A.,Duguay C.R.,et al. Influence of surface water on coarse resolution C-band backscatter: Implications for freeze/thaw retrieval from scatterometer data[J],2020,247.
APA	Bergstedt H.,Bartsch A.,Duguay C.R.,&Jones B.M..(2020).Influence of surface water on coarse resolution C-band backscatter: Implications for freeze/thaw retrieval from scatterometer data.Remote Sensing of Environment,247.
MLA	Bergstedt H.,et al."Influence of surface water on coarse resolution C-band backscatter: Implications for freeze/thaw retrieval from scatterometer data".Remote Sensing of Environment 247(2020).