BEPS-GEM is a coupled model of BEPS and GEM.
GEM (The Global Environmental Multi-scale) model is an operational
model of the Canadian Meteorological Centre (CMC) for numerical
weather forecast and atmospheric research. Coupling work began
in 2004, and many progresses have been made in these two years
although these two models have different spatial resolutions,
projections, time steps, and programming languages. A spatial
scaling methodology was developed based on sub-grid information
(land cover, leaf area index) derived from satellite imagery, and used for the coupling.
The simulated results for the globe at 1° X 1° resolution
and over Canada's landmass at 0.22° resolution show satisfactory
performance of the coupled BEPS-GEM model. After validating
the coupled model with tower observations, we conclude that
the model is successful in capturing both the spatial and
temporal variations in carbon and energy fluxes. The coupled
model is being used as a basis for global inversion of carbon
fluxes using CO2 concentration measurements
at coastal baseline stations as well as tall towers over land.
It is expected that at a later stage, regional fluxes through
inversion will be compared with up-scaled fluxes from Fluxnets
in Canada and USA to improve the reliability of continental
carbon balance estimation.