Friday, April 7, 2017
10:30am – 12:00 pm
Building 66 Auditorium
Lawrence Berkeley National Laboratory
Host: Bhavna Arora
About the Presenter: Dr. Pierre Regnier
Pierre Regnier is Professor of Earth System Science, director of the research group “Biogeochemistry and Modelling of the Earth System” and Vice-Chair of the Department of Geosciences, Environment and Society at the Université Libre de Bruxelles in Belgium. He was previously Associate Professor at Utrecht University (the Netherlands).
His research focuses on the global carbon cycle and its anthropogenic perturbation with a strong emphasis on inland waters, estuaries and coastal environments and their interaction with terrestrial ecosystems and the open ocean. His expertise encompasses the biogeochemistry of carbon and nutrients, carbon dioxide and methane cycling, reactive-transport modelling and Earth system science.
The transfers and transformations of carbon (C) along the land to ocean aquatic continuum (LOAC) has recently been recognized as an important component of the global carbon cycle, not only for the mean, but also with regard to past and future changes. Although the LOAC C budget is increasingly constrained at the global scale, large uncertainties remain regarding its present-day spatio-temporal variability and virtually nothing is known regarding past and future trends in LOAC C fluxes, and especially not in quantitative terms. My contribution synthesizes the recent advances in global and regional LOAC C cycle research. First, I will present a revised atmosphere-aquatic systems CO2 flux estimate at high spatial resolution, from streams to open ocean. The dominant latitudinal patterns and the temporality in air-water CO2 fluxes will be discussed, with a focus on shelf systems. Second, I will zoom on the Amazon river basin and provide a full C cycle analysis from canopy to tropical ocean. Finally, I will elaborate on the quantification and attribution of changes in land to ocean C fluxes over the historical period and in the future and speculate about the role of the LOAC for the anthropogenic CO2 budget and climate projections.