Parameters available in the ECMWF ERA-40 Re-analysis data held at the BADC

Introduction

The BADC archives a range of parameters produced by the ECMWF ERA-40 Re-analysis project.

The tables on this web page display all the parameters that are available for each grid type and resolution. The tables also include the time period and the type and number of levels for which each parameter is available.

N80 Reduced Gaussian Gridded data
Spectral T159 data
An explanation of the forecast files
An explanation of the wave data files (lwasYYYYMMDDHHP[PPPP].grb)

Descriptions of the various grids and level types are also provided.

Details of the available parameters are also listed for the Operational and ERA-15 data sets on separate pages.

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N80 Reduced Gaussian Gridded data

There are 7 types of ERA-40 data archived on the N80 Reduced Gaussian Grid, 5 analysis archives and 2 forecasts archives. The analyses are available on model levels, pressure levels, on surface/single levels, on potential temperature levels and on potential vorticity levels. Forecasts are available on model levels and on surface/single levels. Please see the ECMWF Model Grids page for an explanation of the N80 Reduced Gaussian Grid.

Gaussian Gridded Analyses on Model Levels (ggamYYYYDDHHTTPPP.grb)

Table 1 shows the Model Level parameters available for ERA-40 analysis data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/am/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/am/

The N80 Reduced Gaussian Gridded model level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded model level data takes the form of:

/badc/ecmwf-e40/data/gg/am/YYYY/MM/DD/ggamYYYYDDHHTTPPP.grb

Table 1. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded model level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Specific humidity 133 Q kg/kg 1-60 60

" " Ozone mass mixing ratio 203 O3 kg/kg " "

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Gaussian Gridded Analyses on Pressure Levels (ggapYYYYDDHHTTPPP.grb)

Table 2 shows the Pressure Level parameters available for ERA-40 analysis data on the N80 Reduced Gaussian Grid. There are also two parameters, u-velocity and v-velocity, that are stored on a N80 Full Gaussian Grid (due to the interpolation from spectral fields). These files are located in the directory:

/badc/ecmwf-e40/data/gg/ap/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/ap/

The N80 Reduced Gaussian Gridded pressure level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded pressure level data takes the form of:

/badc/ecmwf-e40/data/gg/ap/YYYY/MM/DD/ggapYYYYDDHHTTPPP.grb

Table 2. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded pressure level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Potential vorticity 60 PV m² s^-1 K kg^-1 1,2,3,5,7,10,20,30,50,70,100,150,200,250,300,400,500,600,700,775,850,925,1000 23

" " U-velocity* 131 U m² s^-2 " "

" " V-velocity* 132 V m² s^-2 " "

" " Specific humidity 133 Q kg/kg " "

" " Ozone Mass Mixing Ratio 203 O3 kg/kg " "

* u-velocity and v-velocity are held on an N80 Full Gaussian Grid as opposed to a reduced grid. The extraction process requires them to be generated from spectral vorticity and divergence fields and therefore these parameters cannot be obtained on the reduced grid.

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Gaussian Gridded Analyses on Surface/Single Levels (ggasYYYYDDHHTTPPP.grb)

Table 3 shows the Surface/Single Level parameters available for ERA-40 analysis data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/as/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/as/

The N80 Reduced Gaussian Gridded surface/single level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded surface/single level data takes the form of:

/badc/ecmwf-e40/data/gg/as/YYYY/MM/DD/ggasYYYYDDHHTTPPP.grb

Table 3. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded surface/single level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Low vegetation cover** 27 LVC (0-1) 1 1

" " High vegetation cover** 28 HVC (0-1) " "

" " Low vegetation type (table index)** 29 LVT index " "

" " High vegetation type (table index)** 30 HVT index " "

" " Sea ice fraction (1 = full ice, 0 = no ice) 31 CI (0, 1) " "

" " Snow albedo 32 ASN - " "

" " Snow density 33 RSN kg " "

" " Sea surface temperature 34 SSTK K " "

" " Sea ice temperature layer 1 35 ISTL1 K " "

" " Sea ice temperature layer 2 36 ISTL2 K " "

" " Sea ice temperature layer 3 37 ISTL3 K " "

" " Sea ice temperature layer 4 38 ISTL4 K " "

" " Soil moisture level 1 (volumetric) 39 SWVL1 m³/m³ " "

" " Soil moisture level 2 (volumetric) 40 SWVL2 m³/m³ " "

" " Soil moisture level 3 (volumetric) 41 SWVL3 m³/m³ " "

" " Soil moisture level 4 (volumetric) 42 SWVL4 m³/m³ " "

" " Geopotential (at the surface = orography) 129 Z m² s^-2 " "

" " Total column water 136 TCW kg/m² " "

" " Total column water vapour 137 TCWV kg/m² " "

" " Soil temperature level 1 139 STL1 K " "

" " Snow Depth 141 SD m (of water equivalent) " "

" " Charnock parameter 148 CHNK - " "

" " Mean sea level pressure 151 MSL Pa " "

" " Standard deviation of subgrid scale orography** 160 SDOR - " "

" " Anisotropy of subgrid scale orography** 161 ISOR - " "

" " Angle of subgrid scale orography** 162 ANOR - " "

" " Slope of subgrid scale orography** 163 SLOR - " "

" " Total cloud cover 164 TCC (0-1) " "

" " 10 metre u-wind component 165 10U m s^-1 " "

" " 10 metre v-wind component 166 10V m s^-1 " "

" " 2 metre temperature 167 2T K " "

" " 2 metre dewpoint temperature 168 2D K " "

" " Soil temperature level 2 170 STL2 K " "

" " Land/sea mask** 172 LSM (0, 1) " "

" " Surface roughness** 173 SR m " "

" " Albedo* 174 AL - " "

" " Soil temperature level 3 183 STL3 K " "

" " Low cloud cover 186 LCC (0-1) " "

" " Medium cloud cover 187 MCC (0-1) " "

" " High cloud cover 188 HCC (0-1) " "

" " Skin reservoir content 198 SRC m (of water) " "

" " Total column ozone 206 TCO3 kg m^-2 " "

" " Logarithm of surface roughness length for heat** 234 LSRH - " "

" " Skin temperature 235 SKT K " "

" " Soil temperature level 4 236 STL4 K " "

" " Temperature of snow layer 238 TSN K " "

* Albedo is a monthly invariant field throughout ERA-40 (i.e. one constant value per month) but is included with the main archive so that users can access it along with other data.
** These fields are invariant throughout ERA-40 (i.e. they do not change) but have been included at all time steps for easy user access.

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Gaussian Gridded Analyses on Potential Temperature Levels (ggatYYYYDDHHTTPPP.grb)

Table 4 shows the Potential Temperature Level parameters available for ERA-40 analysis data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/at/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/at/

The N80 Reduced Gaussian Gridded potential temperature level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded potential temperature level data takes the form of:

/badc/ecmwf-e40/data/gg/at/YYYY/MM/DD/ggatYYYYDDHHTTPPP.grb

Table 4. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded potential temperature level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Potential vorticity 60 PV m² s^-1 K kg^-1 265, 275, 285, 300, 315, 330, 350, 370, 395, 430, 475, 530, 600, 700, 850 15

" " Specific humidity 133 Q kg/kg " "

" " Ozone mass mixing ratio 203 O3 kg/kg " "

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Gaussian Gridded Analyses on Potential Vorticity Levels (ggavYYYYDDHHTTPPP.grb)

Table 5 shows the Potential Vorticity Level parameters available for ERA-40 analysis data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/av/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/av/

The N80 Reduced Gaussian Gridded potential vorticity level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded potential vorticity level data takes the form of:

/badc/ecmwf-e40/data/gg/av/YYYY/MM/DD/ggavYYYYDDHHTTPPP.grb

Table 5. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded potential vorticity level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Potential temperature 3 PT K 1 1

" " Pressure 54 PRES Pa " "

" " Geopotential (at the surface = orography) 129 Z m² s^-2 " "

" " U-velocity 131 U ms^-1 " "

" " V-velocity 132 V ms^-1 " "

" " Specific humidity 133 Q kg/kg " "

" " Ozone mass mixing ratio 203 O3 kg/kg " "

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Gaussian Gridded Forecasts on Model Levels (ggfmYYYYDDHHTTPPP_SSh.grb)

Table 6 shows the Model Level parameters available for ERA-40 forecast data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/fm/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/fm/

The N80 Reduced Gaussian Gridded potential vorticity level forecasts are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded model level data takes the form of:

/badc/ecmwf-e40/data/gg/fm/YYYY/MM/DD/ggfmYYYYDDHHTTPPP_SSh.grb

Table 6. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded model level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Cloud liquid water content 246 CLWC kg/kg 1-60 60

" " Cloud ice water content 247 CIWC kg/kg " "

" " Cloud cover 248 CC (0-1) " "

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Gaussian Gridded Forecasts on Surface/Single Levels (ggfsYYYYDDHHTTPPP_SSh.grb)

Table 7 shows the Surface/Single Level parameters available for ERA-40 forecast data on the N80 Reduced Gaussian Grid. These files are located in the directory:

/badc/ecmwf-e40/data/gg/fs/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/gg/fs/

The N80 Reduced Gaussian Gridded surface/single level forecasts are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded surface/single level data takes the form of:

/badc/ecmwf-e40/data/gg/fsYYYY/MM/DD/ggfsYYYYDDHHTTPPP_SSh.grb

Table 7. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis N80 Reduced Gaussian Gridded surface/single level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Snow evaporation (accum.)** 44 ES m 1 1

" " Snow melt (accum.)** 45 SMLT m " "

" " Wind gusts at 10 m** 49 10FG m s^-1 " "

" " Large scale precipitation fraction (accum.)** 50 LSPF s " "

" " Large scale precipitation (accum.)** 142 LSP m " "

" " Convective precipitation (accum.)** 143 CP m " "

" " Snow fall (accum.)** 144 SF m (of water equivalent) " "

" " Boundary layer dissipation (accum.) 145 BLD W m^-2s " "

" " Surface sensible heat flux (accum.) 146 SSHF W m^-2s " "

" " Surface latent heat flux (accum.) 147 SLHF W m^-2s " "

" " Boundary layer height** 159 BLH m " "

" " Downward surface solar radiation (accum.) 169 SSRD W m^-2s " "

" " Downward surface thermal radiation (accum.) 175 STRD W m^-2s " "

" " Surface solar radiation (accum.) 176 SSR W m^-2s " "

" " Surface thermal radiation (accum.) 177 STR W m^-2s " "

" " Top solar radiation (accum.) 178 TSR W m^-2s " "

" " Top thermal radiation (accum.) 179 TTR W m^-2s " "

" " East/West surface stress (accum.) 180 EWSS N m^-2s " "

" " North/South surface stress (accum.) 181 NSSS N m^-2s " "

" " Evaporation (accum.)** 182 E m (of water) " "

" " Sunshine duration since last post-processing step 189 SUND s " "

" " Latitudinal component of gravity wave stress (accum.) 195 LGWS N m^-2s " "

" " Meridional component of gravity wave stress (accum.) 196 MGWS N m^-2s " "

" " Gravity wave dissipation (accum.) 197 GWD W m^-2s " "

" " Maximum temp. at 2m since previous post-processing* 201 MX2T K " "

" " Minimum temp. at 2m since previous post-processing* 202 MN2T K " "

" " Runoff (accum.)** 205 RO m " "

" " Top solar radiation clear sky (accum.) 208 TSRC W m^-2s " "

" " Top thermal radiation clear sky (accum.) 209 TTRC W m^-2s " "

" " Surface solar radiation clear sky (accum.) 210 SSRC W m^-2s " "

" " Surface thermal radiation clear sky (accum.) 211 STRC W m^-2s " "

" " Instantaneous X surface stress 229 IEWS N m^-2s " "

" " Instantaneous Y surface stress 230 INSS N m^-2s " "

" " Instantaneous surface heat flux 231 ISHF W/m² " "

" " Instantaneous surface moisture flux (evaporation)** 232 IE kg m^-2s " "

" " Convective snow fall (accum.)** 239 CSF m (of water equivalent) " "

" " Large scale snow fall (accum.)** 240 LSF m (of water equivalent) " "

" " Forecast albedo 243 FAL - " "

" " Forecast surface roughness 244 FSR m " "

" " Forecast logarithm of surface roughness for heat 245 FLSR - " "

* Maximum/Minimum temp. at 2m since previous post-processing (MX2T/MN2T) are available at additional forecast steps of +3/+6/+9/+12 hours from both the 00hr and 12hr analyses. Sampling the data at this frequency captures the maximum (or minimum) between each post-processing step (3-hourly frequency).
** These variables are available at additional forecast steps of +6/+12/+18/+24/+30/+36 hours from both the 00hr and 12hr analyses. These variables are mainly moisture-related fields that are accumulated with time. The data was extracted to allow greater investigation into moisture-related fields within the ERA-40 dataset. Some additional variables were extracted due to user demand.

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Spectral T159 data

There are 3 types of ERA-40 data archived at Spectral T159 resolution as analyses. They are held on model levels, pressure levels and on potential temperature levels. Please see the ECMWF Model Grids page for an explanation of the Spectral T159 resolution.

Spectral T159 Analyses on Model Levels (spamYYYYDDHHTTPPP.grb)

Table 8 shows the Model Level parameters available for ERA-40 analysis data at Spectral T159 resolution. These files are located in the directory:

/badc/ecmwf-e40/data/sp/am/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/sp/am/

The Spectral T159 model level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded model level data takes the form of:

/badc/ecmwf-e40/data/sp/am/YYYY/MM/DD/spamYYYYDDHHTTPPP.grb

Table 8. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis Spectral T159 model level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Geopotential (at the surface = orography) 129 Z m² s^-2 60 1

" " Temperature 130 T K 1-60 60

" " U-velocity 131 U ms^-1 " "

" " V-velocity 132 V ms^-1 " "

" " Vertical velocity 135 W Pa s^-1 " "

" " Vorticity (relative) 138 VO s^-1 " "

" " Log surface pressure 152 LNSP - " "

" " Divergence 155 D s^-1 " "

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Spectral T159 Analyses on Pressure Levels (spapYYYYDDHHTTPPP.grb)

Table 9 shows the Pressure Level parameters available for ERA-40 analysis data at Spectral T159 resolution. These files are located in the directory:

/badc/ecmwf-e40/data/sp/ap/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/sp/ap/

The Spectral T159 pressure level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded pressure level data takes the form of:

/badc/ecmwf-e40/data/sp/ap/YYYY/MM/DD/spapYYYYDDHHTTPPP.grb

Table 9. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis Spectral T159 pressure level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Geopotential (at the surface = orography) 129 Z m² s^-2 1,2,3,5,7,10,20,30,50,70,100,150,200,250,300,400, 500,600,700,775,850,925,1000 23

" " Temperature 130 T K " "

" " U-velocity 131 U ms^-1 " "

" " V-velocity 132 V ms^-1 " "

" " Vertical velocity 135 W Pa s^-1 " "

" " Vorticity (relative) 138 VO s^-1 " "

" " Divergence 155 D s^-1 " "

" " Relative humidity 157 R % " "

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Spectral T159 Analyses on Potential Temperature Levels (spatYYYYDDHHTTPPP.grb)

Table 10 shows the Potential Temperature Level parameters available for ERA-40 analysis data at Spectral T159 resolution. These files are located in the directory:

/badc/ecmwf-e40/data/sp/at/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/sp/at/

The Spectral T159 potential temperature level analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the N80 Reduced Gaussian Gridded potential temperature level data takes the form of:

/badc/ecmwf-e40/data/sp/at/YYYY/MM/DD/spatYYYYDDHHTTPPP.grb

Table 10. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis Spectral T159 potential temperature level fields.

Dates Parameters Levels

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units Levels
Total Levels

01/09/1957 31/08/2002 Montgomery potential 53 MONT m² s^-2 1,2,3,5,7,10,20,30,50,70,100,150,200,250,300,400,500,600,700,775,850,925,1000 23

" " Pressure 54 PRES Pa " "

" " U-velocity 131 U ms^-1 " "

" " V-velocity 132 V ms^-1 " "

" " Vorticity (relative) 138 VO s^-1 " "

" " Divergence 155 D s^-1 " "

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An explanation of the forecast files

The BADC archives ERA-40 data as both analyses and forecasts. Analyses represent the state of the atmosphere at the zero time-step, i.e. the start of a forecast. This is the point at which initial observations have been assimilated with the 6-hour forecast of the previous model run. Many parameters are available in the analyses and are archived only at the zero time-step (i.e. a file for 15 January 1991 at midday would include "1991011512" in its name and would represent the state of the atmosphere at midday on that day). The analyses are calculated and archived 4 times a day, at 00hr, 06hr, 12hr and 18hrs.

Forecast files contain parameters that are not available in the analyses. Such parameters are either accumulated from the analysis time to the time of the forecast or they represent the instantaneous value of the parameter at the forecast time step. In order to make the forecasts compatible with the analysis fields of the same time-step we archive the 24-hour forecasts starting at midnight for ERA-40. This means that the forecasts files any particular day will actually be valid for the time step 24-hours forward in time from the date and time in the main section of the filename. For example, a forecast file for 25 February 1992 would include "1992022500_24h" in its name and would represent a field valid at 24 hours after the analysis time (1992-02-26 00:00). Hence, there is only 1 forecast file per day. Note that the ECMWF actually provides all the analysis fields at forecast times as well but this data is not archived at the BADC.

Note that additional forecast fields were extracted after the initial dataset and these are indicated above in table footnotes.

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An explanation of the wave data files (lwasYYYYMMDDHHP[PPPP].grb)

Table 11 shows the Surface/Single Level wave parameters available for ERA-40 analysis data on the regular 1.5 degree latitude-longitude grid. These files are located in the directory:

/badc/ecmwf-e40/data/lw/as/

They can also be accessed via the web-interface (by registered BADC users) at:
http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/ecmwf-e40/data/lw/as/

The regular 1.5 degree lat/long gridded surface/single level wave analyses are stored following the BADC's ERA-40 file-naming convention.

The complete file and directory structure of the regular 1.5 degree lat/long gridded surface/single level wave data takes the form of:

/badc/ecmwf-e40/data/lw/as/YYYY/MM/DD/lwasYYYYMMDDHHTTP[PPPPP].grb

Table 11. Parameters, dates and levels available for the ECMWF ERA-40 Re-analysis regular 1.5 degree lat/long gridded surface/single level wave fields.

Dates Parameters

Start End Parameters (Name) ECMWF code (numeric) ECMWF code Units
01/09/1957 31/08/2002 Mean wave period based on first moment 220 mp1 s

" " Mean wave period based on second moment 221 mp2 s

" " Wave spectral directional width 222 wdw

" " Mean wave period based on first moment for wind waves 223 p1ww s

" " Mean wave period based on second moment for wind waves 224 p2ww s

" " Wave spectral directional width for wind waves 225 dwww

" " Mean wave period based on first moment for swell 226 p1ps s

" " Mean wave period based on second moment for swell 227 p2ps s

" " Wave spectral directional width for swell 228 dwps

" " Significant wave height 229 swh m

" " Mean wave direction 230 mwd degrees

" " Peak period of 1D spectra 231 pp1d s

" " Mean wave period 232 mwp s

" " Coefficient of drag with waves 233 cdww

" " Significant height of wind waves 234 shww m

" " Mean direction of wind waves 235 mdww degrees

" " Mean period of wind waves 236 mpww s

" " Significant height of total swell 238 shts m

" " Mean direction of total swell 239 mdts degrees

" " Mean square slope of waves 244 msqs dimensionless

" " 10 metre wind speed 245 wind m s**-1

" " 2D wave spectra (single)* 251 2dfd m**2 s radian** -1

* 2D wave spectra (single) stored on 12 directions and at 25 frequencies

Dates		Parameters				Levels
Start	End	Parameters (Name)	ECMWF code (numeric)	ECMWF code	Units	Levels	Total Levels
01/09/1957	31/08/2002	Specific humidity	133	Q	kg/kg	1-60	60
"	"	Ozone mass mixing ratio	203	O3	kg/kg	"	"