Cycle 38r2 summary of changes

Implementation date 25 June 2013 See Newsletter No.136
Detailed description of changes  
Key characteristics of our current forecasting system  

Horizontal (unchanged)

  • Atmospheric
    • HRES: T1279
    • ENS: Leg A T639, Leg B T319, Leg C T255
  • Wave
    • HRES: 0.25 degrees
    • ENS: 0.5 degrees


Data set affected

  • HRES
  • EDA
  • 4DVAR
  • BC
Score card Comparison of scores of model cycle
Meteorological changes
  • Background error variances
  • EDA calibration and filtering
  • Model error cycling in stratosphere switched off
  • Modification of surface drag
  • Modified test parcel entrainment in boundary layer and shallow convection
  • Adjustment of non-orographic gravity wave drag to be consistent with System-4
  • Oxygen absorption
  • Sea-ice/SST quality control over the Caspian Sea
  • Glacier mask over Iceland
Meteorological impacts
  • Vertical resolution
  • Better representation of physical processes (clouds, inversions and vertically propagating gravity waves)
Technical changes
  • New model level definitions:  L137.
  • Correspondence between the L91 and L137
  • The L137 model level data cannot be converted back to GRIB edition 1
  • Software
    • Metwiew 4
    • EMOSLIB 000381 or higher
    • GRIB API 1.9.9 or higher
Model ID
  • Atmospheric: 143
  • Ocean wave: 109
  • Limited-area ocean wave: 209
New disseminated model output


Discontinued disseminated model output None
e-suite experiment number 0062