Joint Seminar: Quantifying carbon processes of the terrestrial biosphere in a global atmospheric inversion

The role of land ecosystems as sources or sinks of carbon in response to human perturbation is not well understood given the spatial heterogeneity and the temporal variability of the biospheric CO2 exchange (Ciais et al., 2000).  Therefore, understanding and quantifying the role of the land biosphere in the global carbon budget is necessary, particularly the response and feedback of carbon fuxes to climatic controls. Atmospheric CO2 measurements have played a key role in assessing source/sink distributions on global scales using atmospheric CO2 inversions (top-down approach) (e.g. Enting et al. (1995); Kaminski et al. (2002); Bousquet et al. (2000); Roedenbeck et al. (2003); Baker et al. (2006)). Process-based models (bottom-up approaches) of carbon fuxes are also useful tools for exploring the underlying processes involved in the uptake and release of carbon in the terrestrial biosphere. These methods on their own are unlikely to provide enough information to fully understand the biological processes driving the uptake and release of atmospheric CO2. Therefore, within this thesis, I developed a modeling framework that couples bottom-up and topdown approaches and uses different data constraints (atmospheric CO2 concentrations, satellite-driven data, and climate data) in order to quantify the carbon sources and sinks of the terrestrial biosphere. This allows us to better understand the underlying processes by optimizing some internal key parameters of the biosphere model in order to fit the observed CO2 concentrations.

Date

11.05.2011

Time

13:30 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Bakr Badawy, IMPRS, MPI Biogeochemie

Organizers

Antje Weitz

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