Monthly archive of atmospheric fields:Raw dataThe IFS writes its data into the MOFC (1090) stream in MARS. All of the data are archived using their original model representation (Reduced Gaussian Grid or Spherical Harmonics). Upper-air fields are archived every 12 hours, whereas surface fields are archived every 3, 6, 12 or 24 hours. Expand |
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title | Complete list of atmospheric fields |
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| Upper-air fields (archived every 12 hours): 129 | Geopotential | 1000 | 925 | 850 | 700 | 500 | - | - | 200 | (also MEAN of each level) | 130 | Temperature | 1000 | 925 | 850 | 700 | 500 | 400 | 300 | 200 | (also MEAN of each level) | 138 | Vorticity (relative) | 1000 | 925 | 850 | 700 | 500 | - | - | 200 | (also MEAN of each level) | 155 | Divergence | 1000 | 925 | 850 | 700 | 500 | - | - | 200 | (also MEAN of each level) | 133 | Specific humidity (gridpoint) | 1000 | 925 | 850 | 700 | 500 | - | - | 200 | (also MEAN of each level) |
60 | Potential vorticity on the 330K isentropic surface | MEAN |
03 | Potential temperature on the 2E-6 potential vorticity surface | MEAN |
Surface fields:The following surface field is archived every 3 hours (1 field): 164 | Total cloud cover | MEAN/MAX/MIN/SD |
The following surface fields are archived every 6 hours (11fields): 39 | Volumetric soil water layer 1 | MEAN/MAX/MIN/SD | 49 | Wind gust at 10m | MEAN/MAX/MIN/SD | 139 | Soil temp level 1 | MEAN/MAX/MIN/SD | 142 | Large scale precipitation | MEAN/MAX/MIN/SD | 143 | Convective precipitation | MEAN/MAX/MIN/SD | 144 | Snow fall | MEAN/MAX/MIN/SD | 159 | Boundary layer height | MEAN/MAX/MIN/SD | 165 | 10 metre u wind component | MEAN/MAX/MIN/SD | 166 | 10 metre v wind component | MEAN/MAX/MIN/SD | 167 | 2 metre temperature | MEAN/MAX/MIN/SD | 168 | 2 metre dewpoint temperature | MEAN/MAX/MIN/SD |
The following surface field is archived every 12 hours (1 field): 151 | Mean sea level pressure | MEAN/MAX/MIN/SD |
The following surface fields are archived every 24 hours (19 fields): 40 | Volumetric soil water layer 2 | MEAN/MAX/MIN/SD | 41 | Volumetric soil water layer 3 | MEAN/MAX/MIN/SD | 42 | Volumetric soil water layer 4 | MEAN/MAX/MIN/SD | 141 | Snow depth | MEAN/MAX/MIN/SD | 146 | Surface sensible heat flux | MEAN/MAX/MIN/SD | 147 | Surface latent heat flux | MEAN/MAX/MIN/SD | 169 | Surface solar radiation downwards | MEAN/MAX/MIN/SD | 170 | Soil temp level 2 | MEAN/MAX/MIN/SD) | 175 | Surface thermal radiation downwards | MEAN/MAX/MIN/SD | 176 | Surface solar radiation | MEAN/MAX/MIN/SD | 177 | Surface thermal radiation | MEAN/MAX/MIN/SD | 178 | Top solar radiation | MEAN/MAX/MIN/SD | 179 | Top thermal radiation | MEAN/MAX/MIN/SD | 180 | East/West surface stress | MEAN/MAX/MIN/SD | 181 | North/South surface stress | MEAN/MAX/MIN/SD | 182 | Evaporation | MEAN/MAX/MIN/SD | 189 | Sunshine duration | MEAN/MAX/MIN/SD | 201 | Max 2m temperature since last postprocessing | MEAN/MAX/MIN/SD | 202 | Min 2m temperature since last postprocessing | MEAN/MAX/MIN/SD |
The following field is archive only at step=0 and for the control forecast (type=cf):
The following derived fields are not archived directly, but their monthly statistics are calculated: 207 | 10m scalar wind speed | MEAN/MAX/MIN/SD | 228 | Total precipitation | MEAN/MAX/SD |
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Wave model monthly forecasts are archived as stream WAMF (1095). In order to retrieve these fields from MARS, two MARS command lines have to be added: method=1, and system=2, but may change, if the monthly forecasting system is modified. Look at the System Change Notice to see which system value is valid. For the control forecast TYPE=CF, for perturbed forecasts TYPE=FC. Here is an example of MARS retrieval: retrieve, class="od",expver=0001,stream=mofc,type=fc,method=1,system=2,levtype=pl, level=500,param=Z,number=1/to/50,date=20020327,time=00,step=12/to/768/by/12, target="out" Weekly MeansMonthly forecast weekly means are calculated for all atmospheric variables and stored in the stream MOFM (1094) and type FCMEAN. Wave model forecast means (weekly means) are calculated and stored in the stream WMFM (1096). Monthly forecast weekly maximum (type FCMAX), minimum (type FCMIN) and standard deviation (type FCSTDEV) have also been calculated and archived for all surface fields. The weeks are as follow: Week 1: day 5 to day 11 (FCPERIOD=05-11) Week 2: day 12 to day 18 (FCPERIOD=12-18) Week 3: day 19 to day 25 (FCPERIOD=19-25) Week 4: day 26 to day 32 (FCPERIOD=26-32) Here is an example of MARS retrieval for weekly means: retrieve, class="od",expver=0001,stream=mofm,type=fc,method=1,system=2,levtype=pl, level=500,param=Z,number=1/to/50,date=20020327, time=00, fcperiod=05-11, target="out" Ensemble means and standard deviationEnsemble means and standard deviations are archived in MARS only for a limited number of fields: temperature at 850 and 500 hPa and geopotential at 1000 and 500 hPa. To retrieve these fields, stream=MOFC, TYPE=EM (ensemble mean) or TYPE=ES (ensemble standard deviation). example: class=od,expver=0001,stream=mofc,type=em,method=1,system=2,levtype=pl,level=500, param=Z,date=20020327,time=00,step=24, target="out" EPSgramsIn order to avoid retrieving 51 members to create EPSgrams, several fields have been reordered, and the minimum, 25%, median, 75% and maximum of the ensemble distribution have been archived. These fields are: T850, total cloud cover, 2-metre temperature, total precipitation and 10 metre scalar wind speed. To retrieve these fields: STREAM=MOFC, TYPE=ED, NUMBER=0 (minimum), NUMBER=12 (25%), NUMBER=25 (MEDIAN), NUMBER=37 (75%) or NUMBER=50 (MAXIMUM) example: class=od,expver=0001,stream=mofc,type=ed,method=1,system=2,number=25,levtype=pl, level=500,param=Z,date=20020327,time=00,step=24, target="out" Monthly archive of ocean fields:Ocean fields in the coupled forecasts:The ocean data are archived together with the atmospheric data, and are distinguished by the 'LEVTYPE' attribute, which is set to 'DEPTH' or 'DP'. Ocean variables are archived as instantaneous fields (product=inst), accumulated fields (product=tacc) or time series (product=tims). The fields are archived along horizontal (section=h), meridional (section=m) or zonal sections (section=z). Ocean fields in the accelerated forecast:Fluxes and ocean data created during the 12 days of ocean real-time forecast ( to create the ocean initial conditions) are stored on MARS under TYPE=OF (ocean fields) and FF (forcing fields). Expand |
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title | Complete list of ocean fields |
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| Monthly archive of ocean fields:Ocean data is output in different sections, H = horizontal, Z = zonal, M = meridional. There are also sections that include the time dimension: Z=longitude-time, M=latitude-time and V=depth-time. Each of these sections is a two-dimensional field, with a particular orientation in space and time. Each forecast ensemble member archives the output listed below. The ocean data is archived together with the atmosphere data, and is distinguished by the 'LEVTYPE' attribute, which is set to 'DEPTH' or 'DP'. The following instantaneous fields are written every 24 hours. They should allow a rough estimate of drift in the ocean, and give a snapshot of any numerical problems. Horizontal fields are: Section | Code | Depth | Name | H | 129 | 5/425 | Potential temperature | H | 130 | 5/425 | Salinity | H | 131 | 5 | u-velocity | H | 132 | 5 | v-velocity | H | 145 | 0 | Sea-level | H | 148 | 0 | Mixed-layer depth | H | 133 | 225 | w-velocity |
Vertical zonal sections are: Section | Code | Latitude | Name | Z | 129 | 0 | Potential temperature | Z | 130 | 0 | Salinity | Z | 131 | 0 | u-velocity | Z | 132 | 0 | v-velocity | Z | 133 | 0 | w-velocity |
Vertical meridional sections are: Section | Code | Longitude | Name | M | 129 | 220 | Potential temperature | M | 130 | 220 | Salinity | M | 131 | 220 | u-velocity | M | 132 | 220 | v-velocity | M | 133 | 220 | w-velocity |
The following accumulated fields are written once per month during the forecasts. Monthly means can be derived from them. They are the main fields for diagnosing the oceanic behaviour of the coupled model forecasts. Accumulated horizontal fields are:
Section | Code | Depth | Name | H | 129 | 5 | Potential temperature | H | 130 | 5 | Salinity | H | 131 | 5 | u-velocity | H | 132 | 5 | v-velocity | H | 145 | 0 | Sea level | H | 148 | 0 | Mixed layer depth | H | 163 | 0 | Depth of 20 deg isotherm | H | 164 | 0 | T averaged over upper 300m | H | 175 | 0 | S averaged over upper 300m | H | 153 | 0 | Zonal wind stress | H | 154 | 0 | Meridional wind stress | H | 156 | 0 | Net surface heat flux | H | 157 | 0 | Absorbed solar radiation | H | 158 | 0 | Precipitation - Evaporation |
Accumulated vertical zonal sections are: Section | Code | Latitude | Name | Z | 129 | 0 | Potential temperature | Z | 130 | 0 | Salinity | Z | 131 | 0 | u-velocity | Z | 133 | 0 | w-velocity |
Accumulated vertical meridional sections are: Section | Code | Longitude | Name | M | 129 | 60E/90E/165E/180/140W/95W/30W/10W | Potential temperature | M | 130 | 60E/90E/165E/180/140W/95W/30W/10W | Salinity | M | 131 | 60E/165E/140W/30W | u-velocity | M | 132 | 60E/165E/140W/30W | v-velocity | M | 133 | 60E/165E/140W/30W | w-velocity | M | 138 | 60E/165E/140W/30W | Potential density |
Several so-called time series fields are also produced. These allow detailed examination of the evolution of certain fields along given lines of latitude or longitude. In all cases the temporal resolution is daily. Lines of latitude are: Section | Code | Depth | Latitude | Name | Z | 129 | 5 | 0 | Potential temperature | Z | 131 | 5 | 0 | U velocity | Z | 145 | 0 | 0 | Sea level | Z | 163 | 0 | 0 | Depth of 20 deg isotherm | Z | 153 | 0 | 0 | Zonal wind stress | Z | 164 | 0 | 8N/5N/0/5S/8S | T averaged over upper 300m |
Lines of longitude are: Section | Code | Depth | Longitude | Name | M | 129 | 5 | 180/60W | Potential temperature | M | 145 | 0 | 180/60W | Sea level | M | 148 | 0 | 180/60W | Mixed layer depth |
Finally, a small selection of instantaneous fields is output daily, to allow study of the evolution of the system on synoptic timescales. The fields concerned are: Section | Code | Depth | Name | H | 129 | 5 | Potential temperature | H | 145 | 0 | Sea level | H | 148 | 0 | Mixed layer depth | M | 129 | 0 | Potential temperature |
Monthly archive of ocean fields (accelerated forecast): Since the ocean analysis lags about 12 days behind real time, the ocean model is integrated from the last ocean analysis forced by analysed wind stress, heat fluxes and P-E. During this "ocean forecast", the sea surface temperature is relaxed towards persisted SST, with a damping rate of 100W/m2/K. Forcing fields (TYPE=FF): The time-averaged fields used to force the ocean during the 12 days of ocean integration are archived on MARS: Section | Code | Depth | Name | H | 157 | 0 | Absorbed solar radiation | H | 161 | 0 | Diagnosed sea surface temperature error | H | 162 | 0 | Heat flux correction | H | 156 | 0 | Net surface heat flux | H | 129 | 0 | Ocean potential temperature | H | 158 | 0 | Precipitation-evaporation | H | 159 | 0 | Specified sea-surface temperature | H | 160 | 0 | Specified surface heat flux | H | 153 | 0 | u stress | H | 154 | 0 | v stress |
Ocean Fields (TYPE=OF): Same fields as for the operational ocean analysis. The list includes all the fields stored during coupled integrations but with a much larger number of levels, longitude and latitude lines. |
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