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## Inundated Fraction Prediction

The article discusses a simplified dynamic representation of spatial inundation based on recent work by Prigent et al. (2007). This approach uses a multi-satellite method to estimate the global monthly inundated fraction (Fi) over a 0.25° x 0.25° grid from 1993-2000. 

The IGBP estimate for inundation is used as a measure of sensitivity of the satellite-derived Fi at low inundation levels. The method performs a simple inversion to calculate the inundated fraction for methane production (fs), optimizing two parameters (fws_slope and fws_intercept) for each grid cell based on simulated total water storage (TWS):

fs = fws_slope * TWS + fws_intercept

These parameters are evaluated at 0.5° resolution and aggregated for coarser simulations. The article notes that ongoing work in the hydrology submodel of CLM may negate the need for this simplified inundation fraction approach in future model versions.