Data Nomenclature

ENACT output filename nomenclature

Here is the filename and directory structure to be used in the DODS servers (based on the ECMWF system) :

DIRECTORY STRUCTURE

/Originator/expid/method/type/year/filename.nc

1. Originator: Institution (character length=5)
   • ECMWF ,CERFA (CERFACS) ,LODYC ,INGV, KNMI, MPIfM and UKMET
2. Expid: Experiment identifier (character length=4)
3. Method: assimilation method (character length=3)
   • ctl = Control Run
     
   • oia = Optimal Interpolation
     
   • ekf = Ensemble Kalman Filter
     
   • 3dv = 3D Var
     
   • 4dv = 4D Var
     
4. Type: whether analysis/forecast/run (character length=2)
   • AN for analysis
   • FC for forecast
   • OR for ocean run
   • OA for objective analysis
5. Year: which year in YYYY format (character length=4)

Example : /ECMWF/0001/ctl/AN/1999/

FILENAME

We choose to put only one parameter per file

type_prod_expid_yyyymmd0_yyyymmdi_yyyymmdf_Exxx_Mxx_parameter.nc

where:

• Type: whether analysis/forecast/run (character length=2)

  • AN = Analysis
  • FC = Forecast
  • OR = Ocean run
  • OA = Objective analysis
    
• Prod refers to type of field, e.g.
  • INST: for instantaneous
  • TAVG: time average
  • TACC: time accumulated
  • TIMS: time series
    
• Expid: Experiment identifier (character length=4)
  
• yyyymmd0 start of the experiment
  
• yyyymmdi start of the 'averaging' period

• yyyymmdf end of the 'averaging' period

  NOTE : to define the monthly means the dd (days) should be replace by 00

• Exxx where xxx is the ensemble number

• MMM where MMM is the method
  • ctl = Control Run
  • oia = Optimal Interpolation
  • ekf = Ensemble Kalman Filter
  • 3dv = 3D Var
  • 4dv = 4D Var
    

  The method is followed by two (2) digits (from 00 to 99) to get the possibility to have different assimilation under the same method.

  e.g. : ctl01

• parameter
  • 129 or T : Temperature
  • 130 or S : Salinity
  • 131 or U : Zonal current
  • 132 or V : Meridian current
    
• denomination for Enact grid (EG) or original grid (OG)

Note : File extension should be nc not cdf

Example

OR_TAVG_0001_19780101_19830100_19831200_E000_ctl01_EG_T.nc

---

ECMWF local table 2 version 151 (Ocean - operational)

Code Name Field description Units Comments
128 NONE Reserved
- -
129 OCPT Ocean potential temperature deg C -
130 S Salinity psu -
131 U U velocity m s**-1 -
132 V V velocity m s**-1 -
133 WV W velocity m s**-1 -
134 MST Modulus of strain rate tensor s**-1
135 VVS Vertical viscosity m**2 s**-1 -
136 VDF Vertical diffusivity m**2 s**-1 -
137 DEP Depth m -
138 STH Sigma-theta kg m**-3 -
139 RN Richardson number - -
140 to 144 - Unused - -
145 SL Sea level m Tides removed
146 SL_1 Sea level previous timestep m -
147 BSF Barotropic stream function m**3 s**-1 -
148 MLD Mixed layer depth m -
149 to 151 - Unused - -
152 NONE Reserved - -
153 TAX U stress Pa -
154 TAY V stress Pa -
155 TKI Turbulent kinetic energy input W m**-2 -
156 NSF Net surface heat flux W m**-2 -
157 ASR Absorbed solar radiation W m**-2 -
158 PME Precipitation - evaporation m s**-1 -
159 SST Specified sea surface temperature deg C -
160 SHF Specified surface heat flux W m**-2 -
161 DTE Diagnosed sea surface temperature error deg C -
162 HFC Heat flux correction W m**-2 -
163 20D 20 degrees isotherm depth m -
164 TAV300 Average potential temperature in the upper 300m degrees C -
165 to 166 - Unused - -
167 ZTR Vertically integrated zonal volume transport m**2 s**-1 -
168 MTR Vertically integrated meridional volume transport m**2 s**-1 -
169 ZHT Vertically integrated zonal heat transport J m**-1 s**-1 -
170 MHT Vertically integrated meridional heat transport J m**-1 s**-1 -
171 UMAX U velocity maximum m s**-1 -
172 DUMAX Depth of the velocity maximum m -
173 SMAX Salinity maximum psu -
174 DSMAX Depth of salinity maximum m -
175 SAV300 Average salinity in the upper 300m psu -
176 to 177 - Unused - -
178 PTI Potential temperature increment deg C/time unit -
179 PTAE Potential temperature analysis error deg C -
180 BPT Background potential temperature deg C -
181 APT Analysed potential temperature deg C -
182 PTBE Potential temperature background error deg C -
183 AS Analysed salinity (from balance operator)psu -
184 SALI Salinity increment (from balance operator) psu/time unit -
185 SALB Salinity bias (from balance operator) psu/time unit
187 UI Zonal vel increment (from balance operator) m s**-1/timeunit
188 VI Meridonal vel incr (from balance operator) m s**-1/timeunit
189 unused
190 SALT Total (balanced + direct data) Salt incr psu/time unit -
191 SALE Salinity analysis error psu
192 BSAL Background salinity psu
193 ASU Analysed salinity psu
194 SALE Salinity background error psu
195 SSS Sea surface Salinity psu
196 ThD Thermocline Depth m
197 to 200 - Unused - -
201 RELT PT incr from relaxation to climalotogy deg C/time unit
202 RELS Sal incr form " " " psu/time unit
203 to 254 - Unused -

255 NONE Reserved - -

ECMWF convention table: Table151.txt

---