报告内容：Due to strong climate warming in the northern regions over the past several decades, arctic hydrology and permafrost have changed substantially. Many recent studies document significant variations and changes in snow cover, river discharge, water temperature, ice condition, soil temperature, active layer thickness, and vegetation characteristics across the large arctic watersheds/regions. Based on recent data analysis and literature review, this presentation aims to synthesize our knowledge of northern hydrology and permafrost in a warming climate. Specifically, it will: a) describe the seasonal cycles of discharge, water temperature, and heat flux from the northern rivers to the Arctic Ocean; b) discuss regional/basin permafrost features/changes and their effects/impacts on discharge regimes/changes; and c) highlight some applications/challenges of EO/remote sensing products for northern hydrology/climate investigations. This presentation will mostly focus on the largest rivers, i.e. the Lena, Yenisey, Ob, Mackenzie and Yukon, and discuss the results from statistical analyses and model simulations of historical changes in freshwater and heat transport processes due to climate variation and human impact, including the effects of reservoir regulation. The main goal of this talk is to enhance exchange/collaboration of cold region/northern hydrology/permafrost research.
报告人简介：Dr. Daqing Yang is a research professor at ITP, with extensive research experience in China, Canada, USA, Japan, and Norway. His primary research activities/interests include cold region hydrology and climate, particularly Arctic large river streamflow regime and change, snow cover and snowfall measurements, climate change and human impact to regional hydrology, and applications of remote sensing and models in cold regions. He published more than 150 journal articles and contributed to the IPCC and Arctic Council’s Snow, Water, Ice and Permafrost in the Arctic (SWIPA) assessments. He served as the Associate Editor for Journal of Hydrology and EGU’s Atmospheric Measurement Technique. He has edited/co-edited 3 IAHS Red Books on topics of cold region hydrology and water balance, and a comprehensive volume “Arctic Hydrology, Permafrost and Ecosystems” published by Springer in 2021.
