A Surface Freeze-Thaw Cycle Detecting Framework Based on Passive Microwave Data for the Alpine Zone: A Case Study of Three River Source Region in the Qinghai-Tibetan Plateau

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NETL
NSTL
IEEE

外文摘要：The freeze-thaw cycle of near-surface soils significantly affects energy and water exchanges between the atmosphere and land surface. Passive microwave remote sensing is commonly used to observe the freeze-thaw state. However, existing algorithms face challenges in accurately monitoring near-surface soil freeze/thaw in alpine zones. This article proposes a framework for enhancing freeze/thaw detection capability in alpine zones, focusing on band combination selection and parameterization. The proposed framework was tested in the three river source region (TRSR) of the Qinghai-Tibetan Plateau. Results indicate that the framework effectively monitors the freeze/thaw state, identifying horizontal polarization brightness temperature at 18.7 GHz (TB18.7H) and 23.8 GHz (TB23.8H) as the optimal band combinations for freeze/thaw discrimination in the TRSR. The framework enhances the accuracy of the freeze/thaw discrimination for both 0 and 5-cm soil depths. In particular, the monitoring accuracy for 0-cm soil shows a more significant improvement, with an overall discrimination accuracy of 90.02%, and discrimination accuracies of 93.52% for frozen soil and 84.68% for thawed soil, respectively. Furthermore, the framework outperformed traditional methods in monitoring the freeze-thaw cycle, reducing root mean square errors for the number of freezing days, initial freezing date, and thawing date by 16.75, 6.35, and 12.56 days, respectively. The estimated frozen days correlate well with both the permafrost distribution map and the annual mean ground temperature distribution map. This study offers a practical solution for monitoring the freeze/thaw cycle in alpine zones, providing crucial technical support for studies on regional climate change and land surface processes.

外文关键词：

Soil measurementsSurface topographyMicrowave sensorsRemote sensingRadiometersClimate changeScanning thermal microscopyEnergy captureIce accretionWater monitoring

作者：

Bo Wen、Tingbin Zhang、Xiaobing Zhou、Dongmei Chen、Guihua Yi、Jingji Li、Xiaojuan Bie、Jiao Hu、Xian Liu

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作者单位：

College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu, China

College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu, China|State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil and Water Pollution, Chengdu University of Technology, Chengdu, China

Department of Geological Engineering, Montana Technological University, Butte, MT, USA

Department of Geography and Planning, Queen's University, Kingston, ON, Canada

College of Geography and Planning, Chengdu University of Technology, Chengdu, China

College of Ecology and Environment, Chengdu University of Technology, Chengdu, China|State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil and Water Pollution, Chengdu University of Technology, Chengdu, China

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出版年：

2025

DOI：

10.1109/JSTARS.2024.3494267

IEEE journal of selected topics in applied earth observations and remote sensing

ISSN：

年,卷(期)：2025.18(1)

参考文献量45