Dept of Earth & Environmental Sciences
Centre for Environmental and Information Technology (EIT)
200 University Ave. W
Waterloo, Ontario, Canada N2L 3G1
Phone: (519) 888-4567
Development of hypoxic and acidified bottom waters in the Lower St. Lawrence Estuary and its impact on sediment biogeochemistry
Prof. Alfonso Mucci, Department of Earth and Planetary Sciences, McGill University
Everyone welcome! Reception to follow in the EIT foyer.
Dissolved oxygen in the bottom waters of the Lower St. Lawrence Estuary (LSLE) and western Gulf of St. Lawrence have decreased from 130 μM in the 1930s to less than 60 μM. More than 1300 km2 of seafloor is now permanently bathed in hypoxic water ( <62.5 μM). A concurrent warming of the bottom waters suggests that most of the oxygen depletion results from a change in ocean circulation in the northwestern Atlantic and modification of the properties of the water mass that enters the Gulf of St. Lawrence through Cabot Strait. Geochemical and micropaleontological tracers in sediment cores recovered in the LSLE suggest that further oxygen depletion is due to increased local oxygen consumption/demand. The establishment of bottom-water hypoxic conditions is reflected by their progressive acidification and changes in the biogeochemistry of the sediments.
Alfonso Mucci completed a B.Sc.(1976) and M.Sc.(1978) in Chemistry at Université de Montréal. He then moved to the Rosenstiel School of Marine and Atmospheric Sciences of the University of Miami where he obtained a Ph.D.(1981) in Marine and Atmospheric Chemistry. After post-doctoral studies at Texas A&M and Argonne National Laboratory, he moved back to Canada in 1983 after being awarded a NSERC University Research Fellowship at Université du Québec à Rimouski. In 1985, he moved to the Department of Earth and Planetary Sciences at McGill where he has since served two terms as Chair. In 2001, he received the Past President’s Medal of the Geological Association of Canada, was elected a Fellow of the Royal Society in 2008 and was awarded the Michael J. Keen Medal from the Marine Geosciences Division of the Geological Association of Canada in 2011. He has served as an Associate Editor of Geochimica et Cosmochimica Acta since 2000 and Marine Chemistry since 2010.
The Adrian Smith Lecture Series
The Adrian Smith Lecture Series on Environmental Geochemistry, an annual lecture in environmental geochemistry, was established in the Department of Earth and Environmental Sciences at the University of Waterloo by colleagues and friends in memory of Dr. Adrian Smith.
For more than a decade Adrian Smith was a regular visitor to our department, initially as guest speaker and later as an adjunct faculty member, a colleague and a supervisor to our students. Adrian generously gave his time, participating in technical discussions of thesis projects, providing comments and advice for improvements and fostering philosophical debates. These efforts are reflected in new approaches and attitudes that our students take toward research and science.
200 University Avenue West
Waterloo, ON N2L 3G1