Implemented: 30 September 2008  

Datasets affected

  • HRES
  • ENS




Atmospheric (unchanged)
  • HRES: TL799
  • ENS: Leg A TL399
Wave (unchanged)
  • HRES: 0.25 degrees
  • ENS: 0.5 degrees

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

Meteorological content

  • The OSTIA (Operational Sea Surface Temperature and Sea Ice Analysis) high-resolution sea surface temperature, produced by the Met Office, and corresponding sea ice analysis (from EUMETSAT Ocean and Sea Ice SAF)
  • Conserving interpolation scheme for trajectory fields in 4D- Var
  • New variational bias correction ( VARBC) bias predictors to allow the correction of infrared shortwave channels affected by solar effects
  • Cleaner cold-start of AMSUA channel 14 bias corrections
  • Changes to physics for melting of falling snow, albedo of permanent snow cover (e.g. over Antarctica), diurnal variation of sea surface temperature, and linear parametrization schemes
  • Convective contribution added to wind gusts in post-processing
  • Monitoring of MERIS total-column water vapour data
  • Neutral scores for the extra-tropics, and improved scores for upper tropospheric winds in the tropics.
  • Improvement in both hemispheres for the late medium range.

Meteorological impact

  • Improvements to the handling of melting snow as it falls
  • New sea-surface temperature analysis product
    • higher-resolution
    • more frequently updated information, in particular in cloudy situations, based on a range of satellite and in-situ observations.
    • significant ice differences  in the areas with broken ice
    • largest SST differences in the Polar Regions and meanders of the major currents such as the Gulf Stream

Technical content

Model ID and experiment number

  • Atmospheric: 133
  • Ocean wave: 118
  • Limited-area ocean wave: 218

E-suite experiment number = 0040


ECMWF Newsletter: See Newsletter 120