气候变化领域集成服务门户(CCPortal): Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau

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DOI	10.1016/j.rse.2020.112011
	Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau
	Lu P.; Han J.; Li Z.; Xu R.; Li R.; Hao T.; Qiao G.
发表日期	2020
ISSN	00344257
卷号	249
英文摘要	Lakes and permafrost on Qinghai-Tibet Plateau (QTP) are both important indicators of climate change. Previous literatures have shown the usefulness of optical remote sensing in lake expansion monitoring and the effectiveness of synthetic aperture radar (SAR) interferometry (InSAR) in retrieving permafrost deformation on QTP. However, none of them incorporated both optical remote sensing and InSAR to investigate an event that may exhibit causal links between lake outburst and permafrost degradation. This study integrated both the Google Earth Engine (GEE) analysis on optical images and the small baseline subset (SBAS) processing on SAR datasets to evaluate the potential impact of a lake outburst event on permafrost degradation. The outburst of Zonag Lake (headwater lake) that occurred on 14 September 2011 was focused, and its consequential influence on the permafrost degradation surrounding Salt Lake (tailwater lake) was investigated. The GEE processing on Landsat and HJ-1 imageries allowed an efficient monitoring of the Salt Lake expansion over past 20 years. In addition, the SBAS-InSAR analysis on temporal Envisat and Sentinel-1 datasets further discovered the accelerated permafrost degradation surrounding Salt Lake after 2014. The results provide an evidence that on QTP the outburst of a headwater lake may significantly accelerate the permafrost degradation surrounding the tailwater lake. Such degradation may be attributed to the thermal alteration of the permafrost thawing-freezing cycle and the melting ground ice, along with the subsequent changes on hydrological connectivity and soil permeability. With the continuous trend of the permafrost degradation surrounding Salt Lake, potential risks may be further exposed to the regional environment and infrastructures such as the Qinghai-Tibet railway and highway, thus deserving a particular attention in the near future. The novelties of this study are: 1) technically, the preliminary attempt to integrate the GEE and InSAR techniques for a joint analysis of lake expansion and permafrost degradation, and 2) scientifically, the finding that lake outburst may accelerate permafrost degradation on QTP. © 2020 The Author(s)
英文关键词	Google Earth Engine (GEE); Lake outburst; Permafrost; Qinghai-Tibet Plateau (QTP); Small baseline subset (SBAS)
语种	英语
scopus关键词	Climate change; Expansion; Geometrical optics; Permafrost; Remote sensing; Synthetic aperture radar; Hydrological connectivity; Optical remote sensing; Permafrost degradation; Qinghai Tibet plateau; Qinghai Tibet railway; Regional environments; Small baseline subsets; Synthetic aperture radar interferometry; Lakes; climate change; data set; environmental degradation; environmental monitoring; Envisat; lacustrine environment; outburst; permafrost; radar interferometry; remote sensing; satellite data; Sentinel; synthetic aperture radar; China; Qinghai-Xizang Plateau
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/179171
作者单位	College of Surveying and Geo-Informatics, Tongji University, Siping Road 1239, Shanghai, 200092, China
推荐引用方式 GB/T 7714	Lu P.,Han J.,Li Z.,et al. Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau[J],2020,249.
APA	Lu P..,Han J..,Li Z..,Xu R..,Li R..,...&Qiao G..(2020).Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau.Remote Sensing of Environment,249.
MLA	Lu P.,et al."Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau".Remote Sensing of Environment 249(2020).