Main.CurrentWorkMOSES2 History
Hide minor edits - Show changes to output
Changed lines 1-2 from:
(back to up to [[CurrentWorkRobin]])
to:
(back to up to [[ScienceWorkRobin]])
Changed lines 9-15 from:
Implementing MOSES2.2 in FAMOUS was a heroic task on the part of Annette. The climate it produces is, however, substantially different from MOSES1 FAMOUS. In general, there is a high latitude warm bias in winter, and a land surface warm bias during summer. These issues are still extant, although a version of FAMOUS+MOSES2.2 has been released (XCVJO) for other FAMOUS users to contribute tuning/improvements.
The high latitude winter warm bias may be partly explained by the use of 2 dynamic sweeps in the atmospheric timestepping (see [[CurrentWorkTimestepping]]), although the older sea-ice albedoes are already being used. MOSES1 FAMOUS does however have a significant winter cold bias wrt climatology though, so, although we are unclear as to exactly how it arisescould be seen as an improvement rather than an error.
In
to:
Implementing MOSES2.2 in FAMOUS was a heroic task on the part of Annette. The climate it produces is, however, substantially different from MOSES1 FAMOUS. In general, there is a high latitude warm bias in winter, and a land surface warm bias during summer. These issues are still extant, although a version of FAMOUS+MOSES2.2 has been released (XFHCY) for other FAMOUS users to contribute tuning/improvements. This release candidate also includes the top level rayleigh friction that fixes the unphysical top level winds, and free-drifting sea-ice.
The high latitude winter warm bias seems to result from the reduction in northern hemisphere filtering that comes with fixing the top level winds. MOSES1 FAMOUS does have a significant winter cold bias wrt climatology, so the warm bias of MOSES2.2 is really an improvement rather than an error. In fact, JJA warm biases over Europe, Russia and Alaska are the only areas where the MOSES2.2 climate is significantly worse than MOSES1 wrt surface temperature climatologies. I am currently investigating the sensitivity of the summer time warm biases over land to the vegatation distribution.