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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 (HRES and medium range ensemble).

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.  The value of the land/water proportion strongly depends on the quality of used global land cover map and its horizontal resolution (current nominal resolution is ~300m).  

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