Implemented: 03 June 2008  

Datasets affected

  • ENS
  • Limited wave model area




Atmospheric (unchanged)
  • HRES: TL799
  • ENS: Leg A TL399
  • HRES: 0.25 degrees
  • ENS: 0.5 degrees
  • LAW: 0.1 degrees (was 0.25)

Atmospheric (unchanged)
  • HRES: L91
  • ENS: L62

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.


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

Technical content

Model ID and experiment number

  • Atmospheric: 132
  • Ocean wave: 117
  • Limited-area ocean wave: 217

E-suite experiment number = 0037


ECMWF Newsletter: See Newsletter 116