Research Seminar: Geodetic and Remote Sensing Observations of Thawing Permafrost
-
Date
02 Sep 2022
-
Organiser
Department of Land Surveying and Geo-Informatics (LSGI)
-
Time
10:30 - 11:30
-
Venue
Z414, Block Z, PolyU Map
Speaker
Dr Lin LIU
Enquiry
Ms Anna Choi 3400 8158 anna.choi@polyu.edu.hk
Summary
Accumulating observation evidence shows widespread thawing and degradation of permafrost, or ground remains frozen perennially, in cold regions Thawing permafrost has profound effects on terrestrial ecosystems, on hydrologic and landscape processes, and on human infrastructure 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 present the innovative use geodetic and remote sensing methods, including radar interferometry and GNSS Reflectometry, and deep learning, for mapping and quantifying permafrost degradation on the Qinghai Tibetan Plateau and gain quantitative understandings on seasonal, decadal, gradual, as well as abrupt changes in ice rich permafrost.
Keynote Speaker
Lin Liu is an Associate Professor of Earth System Science at the Chinese University of Hong Kong, where he also serves as the head of the Graduate Division of Earth and Atmospheric Sciences He studied at Wuhan University for his bachelor degree and got his PhD in Geophysics from the University of Colorado at Boulder 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 AGU John Wahr Early Career Award.
