Datasets affected

• ENS
• Limited wave model area

Resolution

LAW

Meteorological content

• Improved moist physics in tangent linear/ adjoint model used in 4D- Var assimilation.
• Re-tuned entrainment in convection scheme.
• Bug fix to scaling of freezing term in convection scheme.
• Additional shear term in diffusion coefficient of vertical diffusion.
• Increased turbulent orographic form drag.
• Fix for soil temperature analysis in areas with 100% snow cover.
• Change in surface roughness for momentum, and change in post-processing of two-metre temperature and specific humidity.
• Assimilation of AMSR-E and TMI radiances in 1D+4D-Var; assimilation OMI ozone data.
• Usage of all four wind solutions for QuikSCAT in assimilation, rather than only two previously.
• Extended coverage and increased resolution for the limited area wave model.
• Improved shallow water physics and modified advection scheme for ocean wave models.
• Introduction of two new wave model parameters: maximum wave height and corresponding wave period.

Evaluation

• modest but significant positive impact on northern hemisphere and European scores in the troposphere
• similar results were obtained for three weeks of ENS testing

Resources

ECMWF Newsletter: See Newsletter 116