Description of the upgrade

1. new parametrization schemes for the land surface, lying snow and sea-ice;
2. new (RRTM) long wave radiation scheme;
3. improved ozone model;
4. use more TOVS/ATOVS data (HIRS-12, AMSU-14; less constraint on AMSU-8; more off-nadir data)
5. revised snow analysis;
6. revised observation and background error variances;
7. use of buoys platform heights;
8. digital filter for gravity wave constraint.

Resolution

Unchanged