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Table of Contents

Land-Sea mask

The land-sea mask (LSM) is an unchanging field containing the fraction of land within every grid box.  The proportion of land and water is calculated by using a satellite derived 300m resolution dataset, so this should be quite precise when aggregated to the 9km resolution of the medium range forecasts.  The Land-Sea mask values lie between 0 (grid box is fully covered with water) and 1 (grid box is fully covered with land).   This binary choice of assignment of land/water points means that globally land is slightly under-represented in the model.

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