Authers : Dr. Anjali Verma ,Mr. Karan Singh
Abstract : Permafrost and soil freeze–thaw cycles are critical components of the Earth's cryosphere, influencing hydrology, ecology, and climate dynamics, particularly in high latitude and alpine regions. Monitoring these phenomena over extensive and often inaccessible areas is challenging but vital due to their sensitivity to climate change and their impacts on infrastructure and ecosystems. Remote sensing techniques offer a robust and efficient means to observe and analyze permafrost distribution and freeze–thaw dynamics at various spatial and temporal scales. This paper reviews the principles and recent advances in remote sensing applications for permafrost and soil freeze–thaw cycle monitoring. It highlights the use of optical, thermal infrared, microwave, and synthetic aperture radar (SAR) sensors in capturing surface temperature variations, soil moisture changes, and terrain deformation indicative of freeze–thaw processes. Case studies illustrating the application of remote sensing in monitoring permafrost degradation and freeze–thaw cycles in Arctic and mountainous regions are presented. A comparative table summarizes key remote sensing methods with respect to their data sources, resolution, and limitations. The integration of remote sensing data with in situ measurements and modeling efforts for comprehensive monitoring is emphasized. Challenges such as cloud cover, spatial resolution, and algorithm development are discussed. The paper concludes that remote sensing is indispensable for understanding and managing permafrost and freeze–thaw dynamics amid ongoing climate change.
Keyword : Permafrost, Freeze–thaw cycle, Remote sensing, Synthetic aperture radar, Soil moisture, Cryosphere monitoring
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