YOPP dataset consists of two different ECMWF outputs:

1) Operational ensemble forecast (ENS IFS)

  • Medium-range forecast up to +360 hours (3-hourly up to 144 hours, then 6-hourly outputs)
  • Archived in MARS as Control forecast (type=cf, stream=enfo, class=yp)
  • 7 additional pressure levels to have a better vertical resolution in higher altitudes
  • 8 parameters are coming from the coupled ocean model (2 of them (sea water velocities) are available for the whole period and the remaining 6 since 12 June 2019):



    Average potential temperature in the upper 300m151164
    Average salinity in the upper 300m151175
    Depth of 20C isotherm151163
    Eastward sea water velocity151131
    Northward sea water velocity151132
    Sea surface height151145
    Sea water practical salinity151130
    Sea-ice thickness174098

2) Dedicated research run containing additional tendencies

  • Short-range forecast up to +48 hours (3-hourly outputs)

  • Archived in MARS as Forecast (type=fc, stream=oper, class=yp)

  • Research run that mimics very closely the operational control forecast of the ENS IFS was run from the 15.7. 2017 onwards

  • Additional tendencies from various physical and dynamical processes were archived on model levels (not available from ENS IFS run)

    • The differences for all parameters are on average small compared to the control forecast run, however, locally there can be differences in some parameters

    • The tendencies are described in the table below

      Field 3D
      (note tendencies and fluxes are accumulated)
      UnitsGrib code*1
      u-tendency from explicit dynamicsm/s2 * s162114
      v-tendency from explicit dynamicsm/s2 * s162115
      T-tendency from explicit dynamicsK/s * s162116
      q-tendency from explicit dynamicskg/kg/s * s162117
      T-tendency from radiationK/s * s162118
      u-tendency from vert. diff + orog drag + surf processesm/s2 * s162119
      v-tendency from vert. diff + orog drag + surf processesm/s2 * s162120
      T-tendency from vert. diff + orog drag + surf processesK/s * s162121
      q-tendency from vert. diff + orog drag + surf processeskg/kg/s * s162122

      u-tendency of gravity wave drag

      (including non-orographic)

      m/s2 * s162123

      v-tendency of gravity wave drag

      (including non-orographic)

      m/s2 * s162124
      T-tendency of gravity wave drag (including non-orographic)
       = dissipation wave break
      K/s * s162125
      u-tendency from convection (deep+shallow)m/s2 * s162126
      v-tendency from convection (deep+shallow)m/s2 * s162127
      T-tendency from convection (deep+shallow)K/s * s162128
      q-tendency from convection (deep+shallow)kg/kg/s * s162129
      Precip. flux from convection liquidkg/(m2 s) * s162130
      Precip. flux from convection icekg/(m2 s) * s162131
      T-tendency from cloud schemeK/s * s162132
      q-tendency from cloud schemekg/kg/s * s162133
      ql-tendency from cloud scheme (stratiform)kg/kg/s * s162134
      qi-tendency from cloud scheme (stratiform)kg/kg/s * s162135

      *1 paramId in ECMWF's ecCodes