B53A-0171:
A New Scaling Approach for Calculating Realistic Energy, Water and Carbon Fluxes from GCM Grid Areas.
Friday, 19 December 2014
Piers J Sellers, NASA/GSFC, Greenbelt, MD, United States and Ian T Baker, Colorado State University, Atmospheric Sciences, Fort Collins, CO, United States
Abstract:
The calculation of grid-scale fluxes becomes a real problem whenever the dependent variable, e.g. evapotranspiration, is non-linearly dependent on a spatially-varying dependent variable, eg, soil moisture. A dynamic binning technique was previously developed that captured the spatial variablity of soil moisture using a small number of "bins" which are used to support a single grid-averaged calculation of evapotranspiration. This grid-averaged flux is then deconvolved to update the bin contents and thereby realistically model the resulting changes in the soil moisture distribution. This idea was previously demonstrated in a simple "toy" soil moisture-evaporation model ( Sellers et al , 2007). The approach has recently been implemented in a 1-d version of the Simple Biosphere (SiB-3) model and its performance is being evaluated. The approach is expected to provide more realistic grid-averaged calculations of enrgy, water and carbon fluxes.
