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):

  Name	paramId
  Average potential temperature in the upper 300m	151164
  Average salinity in the upper 300m	151175
  Depth of 20C isotherm	151163
  Eastward sea water velocity	151131
  Northward sea water velocity	151132
  Sea surface height	151145
  Sea water practical salinity	151130
  Sea-ice thickness	174098

  
  

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)	Units	Grib code*1
    u-tendency from explicit dynamics	m/s2 * s	162114
    v-tendency from explicit dynamics	m/s2 * s	162115
    T-tendency from explicit dynamics	K/s * s	162116
    q-tendency from explicit dynamics	kg/kg/s * s	162117
    T-tendency from radiation	K/s * s	162118
    u-tendency from vert. diff + orog drag + surf processes	m/s2 * s	162119
    v-tendency from vert. diff + orog drag + surf processes	m/s2 * s	162120
    T-tendency from vert. diff + orog drag + surf processes	K/s * s	162121
    q-tendency from vert. diff + orog drag + surf processes	kg/kg/s * s	162122
    u-tendency of gravity wave drag (including non-orographic)	m/s2 * s	162123
    v-tendency of gravity wave drag (including non-orographic)	m/s2 * s	162124
    T-tendency of gravity wave drag (including non-orographic)  = dissipation wave break	K/s * s	162125
    u-tendency from convection (deep+shallow)	m/s2 * s	162126
    v-tendency from convection (deep+shallow)	m/s2 * s	162127
    T-tendency from convection (deep+shallow)	K/s * s	162128
    q-tendency from convection (deep+shallow)	kg/kg/s * s	162129
    Precip. flux from convection liquid	kg/(m2 s) * s	162130
    Precip. flux from convection ice	kg/(m2 s) * s	162131
    T-tendency from cloud scheme	K/s * s	162132
    q-tendency from cloud scheme	kg/kg/s * s	162133
    ql-tendency from cloud scheme (stratiform)	kg/kg/s * s	162134
    qi-tendency from cloud scheme (stratiform)	kg/kg/s * s	162135

    *1 paramId in ECMWF's ecCodes