Analysis of continuous CO2 measurements over the continents currently offers the potential to better understand the carbon fluxes between the terrestrial biosphere and the atmosphere, as well as providing an alternate check on fossil fuel emissions to help monitor future Kyoto type treaties on sub-continental scales. To do so requires much higher spatial and temporal resolution in the transport model than has been used in the past to analyse so called ``baseline'' measurements such as those at Mauna Loa and the South Pole which are remote from strong CO2 fluxes. An optimal way to achieve this increase in resolution is to use a model with a flexible grid such that an area of interest can have higher resolution than others, thus saving computational expense. We present the LMDz (Laboratiore Meteorologie Dynamique zoom) model, describing its grid set-up and advection and convection schemes. Its ability to model large-scale features such as the seasonal cycle amplitude at baseline stations, as well as high frequency continental stations over Europe will be shown. We present several sensitivity studies using different spatial and temporal resolution, a new advanced planetary boundary layer scheme, and the impact of using different estimates of the surface CO2 fluxes. We examine the model's behaviour both from a Lagrangian and Eulerian point of view. Finally, we outline the use of the self-adjoint aspect of the atmospheric transport model, and how the model can be used in an inverse mode to retrieve flux information from the atmospheric data at high spatial and temporal resolution.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2002
- 0315 Biosphere/atmosphere interactions;
- 0330 Geochemical cycles;
- 3307 Boundary layer processes;
- 3334 Middle atmosphere dynamics (0341;