Annette Osprey

MOSES and JULES

The Met Office Surface Exchange scheme (MOSES) is a land-surface scheme developed by the Met Office and included in the UM atmopshere code. The Joint UK Land Environment Simulator (JULES) is based on MOSES but is a stand-alone model.

There are 3 versions of MOSES which I am aware of: MOSES 1, MOSES 2.1 and MOSES 2.2. MOSES 1 is included in the UM (boundary layer 5A code) as is MOSES 2.1 (boundary layer 7A code).

The major change at MOSES 2 is the addition of tiled diagnostics - each grid box contains a fraction of 9 surface types rather than being defined by a single type only.

MOSES 2.2 was introduced as a set of mods to 4.5, which were not formally added to the UM until around 5.2 (new dynamics). Coastal tiling was added at version 5.3 (there are mods for 5.2). There have not been many changes since (extra functionality, possible scientific improvements?) and the latest incarnation, JULES, is essentially MOSES 2.2 at 6.1. Most importantly, the structure of JULES is the same as in the 4.5 mods.

See the Hadley Centre MOSES 2.2 documentation for the science.