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Monitoring the Degradation of Island Permafrost Using Time-Series InSAR Technique: A Case Study of Heihe China

机译:使用时间序列InSAR技术监测海岛多年冻土的退化:以中国黑河为例

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摘要

In the context of global warming, the air temperature of the Heihe basin in Northeast China has increased significantly, resulting in the degradation of the island permafrost. In this paper, we used an elaborated time-series Interferometric Synthetic Aperture Radar (InSAR) strategy to monitor the ground deformation in the Heihe area (Heilongjiang Province, China) and then analyzed the permafrost deformation characteristics from June 2007 to December 2010. The results showed that the region presented island permafrost surface deformation, and the deformation rate along the line of sight mainly varied from –70 to 70 mm/a. Based on the analysis of remote sensing and topological measurements, we found that the deformation area generally occurred at lower altitudes and on shady slopes, which is consistent with the distribution characteristics of permafrost islands. Additionally, the deformation of permafrost is highly correlated with the increase of annual minimum temperature, with an average correlation value of –0.80. The accelerated degradation of permafrost in the study area led to the settlement, threatening the infrastructure safety. Our results reveal accelerated degradation characteristics for the island permafrost under the background of rising air temperature, and provide a reference for future relevant research.
机译:在全球变暖的背景下,中国东北黑河盆地的气温显着升高,导致岛屿永久冻土退化。在本文中,我们使用精心设计的时间序列干涉合成孔径雷达(InSAR)策略来监测黑河地区(中国黑龙江省)的地面变形,然后分析了2007年6月至2010年12月的多年冻土变形特征。结果表明,该区域呈现岛状永久冻土表面变形,沿视线的变形率主要在–70至70 mm / a之间变化。通过对遥感和拓扑测量的分析,我们发现变形区一般发生在较低的高度和阴凉的斜坡上,这与多年冻土岛的分布特征是一致的。此外,多年冻土的变形与每年最低温度的升高高度相关,平均相关值为–0.80。研究区多年冻土的加速退化导致沉降,威胁到基础设施安全。我们的研究结果揭示了在气温上升的背景下,岛永久冻土的加速降解特征,并为今后的相关研究提供了参考。

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