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06 OCT 2023 (FRI) 15:00-17:00


Geography Distinguished Seminars Series

Estimating riverine and lake CO2 emissions: How certain are we?

Date: 06 October 2023 (Friday)

Time: 15:00-17:00 (HKT)

Mode: Hybrid Mode

Venue: Chamber, Faculty of Social Sciences, 11/F, The Jockey Club Tower, Centennial Campus, HKU

Zoom: Zoom link will be provided upon successful registration

Registration link:



Current global estimates of CO2 emissions to the atmosphere from rivers and lakes vary largely, i.e., up to 10 folds from the low to high. The uncertainty can originate from difference sources including, among others, field measurement, estimation approach and spatial scaling-up. This presentation will discuss how the uncertainty influences our understanding of carbon budget estimates at the river basin scale, using the findings mainly from recent studies conducted in the lower Mississippi River and subtropical lakes in the southern United States.

Professor YiJun XU

Professor, School of Renewable Natural Resources, Louisiana State University, USA

Speaker Bio:

YiJun Xu (胥毅军) is a professor at Louisiana State University, USA. He obtained his Bachelor's degree from Beijing Forestry University and his Master's and Doctoral degrees both from the Göttingen University, Germany. Dr. Xu’s research has covered a range of topics in surface hydrology, fluvial geomorphology, sediment/nutrient transport, and aquatic biogeochemistry. Part of his recent work focuses on carbon dynamics in riverine and lake systems. Over his research career, Dr. Xu participated in ~70 projects conducted in Asia, Europe, and North America, and led projects funded by the U.S. federal government, including the National Science Foundation, the Environmental Protection Agency, the U.S. Geological Survey, the National Oceanic and Atmospheric Administration, and the U.S. Department of Agriculture. Dr. Xu edited 5 books and authored/co-authored 200+ peer-reviewed publications. He is currently Editor-in-Chief (section Hydrology) for Water and is an associate editor for 3 other journals. In 2011 Dr. Xu was appointed a Senior Affiliated Professor at the Northeast Institute of Geography and Agroecology; In 2014 he was appointed a Member of the International Expert Panel (中科院海外评审专家) by the Chinese Academy of Sciences. In addition to his research, Dr. Xu teaches undergraduate and graduate courses in watershed hydrology, limnology, potamology, water quality, and hydrologic modeling. He has supervised/co-supervised 19 PhD and 23 MS students, and has served on the graduate committees of another 20 PhD and 8 MS students.

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