报告人：刘琳(副教授)

时间：2022.11.18 9:00-10:30

Zoom会议：882-813-15544

密码：见邮件或班级通知

报告人简介

Lin Liu is an Associate Professor of Earth and Environmental Sciences at The Chinese University of Hong Kong, where he also serves as the head of the Graduate Division of Earth and Atmospheric Sciences. He got his Ph.D. in Geophysics from University of Colorado at Boulder in 2011. Before joining CUHK in 2014, he was a George Thompson Postdoc Fellow at Stanford University. His research applies a wide range of geodetic, geophysical, remote sensing, and deep learning methods to the Earth‘s cryosphere systems including permafrost, glaciers, and ice sheets, aiming to quantify and understand their significant changes in a warming climate. He received the 2021 John Wahr Early Career Award from the American Geophysical Union.

报告简介

Accumulating observation evidence shows widespread thawing and degradation of permafrost, or ground remains frozen perennially, in cold regions. Thawing permafrost profoundly affects terrestrial ecosystems, hydrologic and landscape processes, infrastructure, and socioeconomic development. A large amount of carbon currently frozen in permafrost may release into the atmosphere and further warm the global climate. However, it is challenging to study and monitor permafrost, which is purely defined by its subsurface thermal condition.

In this talk, I will review the use of satellite remote sensing, including visible, thermal infrared, and radar, enabled by frozen-ground-tailored algorithms and state-of-the-art deep learning neural networks, for mapping and quantifying permafrost degradation on the Qinghai-Tibetan Plateau. I will summarize the achievements enabled by remote sensing for improving quantitative understandings of seasonal, decadal, gradual, as well as abrupt changes in subsurface permafrost. Despite being fundamentally limited to only observing the surficial features and changes, remote sensing has and will be playing increasingly active and important roles in frozen ground science and engineering as permafrost continues to thaw at an accelerated pace.