气候变化领域集成服务门户(CCPortal): Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects

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DOI	10.1080/10095020.2024.2354867
	Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects
	Huang, Ying; Huang, Lei; Bolch, Tobias
发表日期	2024
ISSN	1009-5020
EISSN	1993-5153
英文摘要	Mountain glaciers are sensitive to climate variability and can be of great importance for downstream populations due to their hydrological significance. Synthetic Aperture Radar (SAR) images are often used to monitor the characteristics of glaciers based on the backscattering coefficient. However, the influence of satellite orbit and polarization when collecting images for wide regions has not been well considered. This study focuses on the extraction of wet snow in summer and firn in winter in West Kunlun Shan and the Tibet Interior Mountains by using Sentinel-1 C-band SAR data. The investigated regions have different climate patterns. We compare backscatter coefficient distributions for wet snow and firn, derived from maximum likelihood classification under various polarizations, alongside their respective ratios and show that polarization has a minor impact on the identification and monitoring of both wet snow and firn. However, a comparison of the wet snow ratios at different satellite orbits reveals notable differences between ascending and descending orbits in summer. We furthermore show, by analyzing weather stations on glaciers, that such effect can be related to the different acquisition time and different temperatures in the morning and afternoon and therefore to the orbit. In contrast, firn ratios across different orbits show less variation in winter, and the monitoring results consistently align with the patterns of ablation and accumulation typical under both climatic influences. These findings demonstrate glaciers' sensitivity to temperature fluctuations and the radar wave's responsiveness to surface characteristics. Consequently, when employing SAR for glacier monitoring, it is crucial to consider the influence of orbit and polarization, in combination with temperature variations, and whether the season is winter or summer.
英文关键词	Continental glacier; Synthetic Aperture Radar (SAR); wet snow; firn; radar glacier zones
语种	英语
WOS研究方向	Remote Sensing
WOS类目	Remote Sensing
WOS记录号	WOS:001233841900001
来源期刊	GEO-SPATIAL INFORMATION SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299536
作者单位	China Earthquake Administration; Chinese Academy of Sciences; Aerospace Information Research Institute, CAS; Graz University of Technology
推荐引用方式 GB/T 7714	Huang, Ying,Huang, Lei,Bolch, Tobias. Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects[J],2024.
APA	Huang, Ying,Huang, Lei,&Bolch, Tobias.(2024).Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects.GEO-SPATIAL INFORMATION SCIENCE.
MLA	Huang, Ying,et al."Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects".GEO-SPATIAL INFORMATION SCIENCE (2024).