InSAR analysis of surface deformation over permafrost to estimate active layer thickness based on one-dimensional heat transfer model of soils.
InSAR analysis of surface deformation over permafrost to estimate active layer thickness based on one-dimensional heat transfer model of soils.
复制标题
基于土壤一维传热模型对多年冻土表面变形进行 InSAR 分析以估计活动层厚度
DOI：
10.1038/srep15542
复制
发表时间：
2015-10-20
影响因子：
4.6
通讯作者：
Wang Q
中科院分区：
文献类型：
--
作者：
Li Z;Zhao R;Hu J;Wen L;Feng G;Zhang Z;Wang Q
本文提出了一种基于InSAR（干涉合成孔径雷达）观测和土壤传热模型来估计永久冻土上活动层厚度（ALT）的新方法。 InSAR观测到的多年冻土表面形变的周期性特征与气象记录温度之间的时滞被假定为温度最大值从地表向下扩散到活动层底部的时间间隔。通过利用时滞和土壤一维传热模型，我们估算了 ALT。以青藏高原南部冻土区为例，对InSAR逐像素ALT估计进行了概念演示。在案例研究中，ALT 范围为 1.02 至 3.14 m，平均为 1.95 m。结果与传统方法的稀疏 ALT 观测/估计兼容，同时在像素级（约 40 米）具有极高的空间分辨率。所提出的方法很简单，并且有可能用于在类似于 QTP 的其他偏远地区获取高分辨率 ALT，这些地区目前只能进行稀疏观测。
This paper presents a novel method to estimate active layer thickness (ALT) over permafrost based on InSAR (Interferometric Synthetic Aperture Radar) observation and the heat transfer model of soils. The time lags between the periodic feature of InSAR-observed surface deformation over permafrost and the meteorologically recorded temperatures are assumed to be the time intervals that the temperature maximum to diffuse from the ground surface downward to the bottom of the active layer. By exploiting the time lags and the one-dimensional heat transfer model of soils, we estimate the ALTs. Using the frozen soil region in southern Qinghai-Tibet Plateau (QTP) as examples, we provided a conceptual demonstration of the estimation of the InSAR pixel-wise ALTs. In the case study, the ALTs are ranging from 1.02 to 3.14 m and with an average of 1.95 m. The results are compatible with those sparse ALT observations/estimations by traditional methods, while with extraordinary high spatial resolution at pixel level (~40 meter). The presented method is simple and can potentially be used for deriving high-resolution ALTs in other remote areas similar to QTP, where only sparse observations are available now.