Find in this page technical specification of the required input data and processing workflow.
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Parameters
Output type: forecast
only one forecast product per centre is expected for verification - the best available one for the common inter-comparison
- Output time: 00, 6, 12, 18 UTC (depending on availability)
Output frequency: between 1 and 6 hours (including step 0 encoded as forecast type as well)
- the model output steps should be the shortest available
- Wave parameters should be obtained from the full 2-D spectrum (we stress this fact as there seems to be some confusion about wave parameters' names and definitions even in the latest WMO GRIB2 code tables)
name | units | paramId*1 | shortName*1 | |
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Atmospheric forcing | 10 metre U wind component | m/s | 165 | 10u |
10 metre V wind component | m/s | 166 | 10v | |
Wave fields | Mean wave direction | degree true | 140230 | mwd |
Mean zero-crossing wave period | s | 140221 | mp2 | |
Peak wave period | s | 140231 | pp1d | |
Significant height of combined wind waves and swell | m | 140229 | swh |
- Follow the links for exact GRIB2 WMO compliant definitions
- *1 valid in ECMWF's ecCodes only
Encoding
All details about the required data format can be found in the page Encoding details.
Sample data
- Providers are asked to provide full sample data from one model run containing all expected parameters, steps, forecast types etc.
- Naming convention for sample data:
wave_<centre WMO origin>_<YYYYMMDDRR>_<prod/test>_fc.grib2
prod/test ... production or test version of the data
fc ... forecast (step 0 should be also encoded as of forecast type) - Merge all parameters from all steps for given model run and output type into one file:
e.g. wave test forecasts from ECMWF on the 1st of September 2017, 12Z => wave_ecmf_2017090112_test_fc.grib2 - Put sample data on ecgate to a directory with reading permission
- alternatively use any other downloadable location (e.g. google drive)
alternatively use this ftp:
Show If special @anonymous Alert Log in to see ftp details
Show If special @authenticated Code Block host: ftp.ecmwf.int user: observations passwd: observations2013 directory: wave
- The naming convention for future production data might change
Production data acquisition
- The data will be pulled via ftp from an agreed server location at the data producer's site.
- The ECMWF's acquisition system will be used for handling the production data exchange.
- Participants are committed to guarantee a steady and reliable provision of their data and to communicate any relevant changes.
- The support mailing list on provider's side will be required to allow smooth communication related to common production issues in the future.
Contact
Show If | ||
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Contact Richard Mladek for any further details, sample data exchange etc. |
Show If | ||
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Contact Richard Mladek for any further details, sample data exchange etc. |
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============================================
(below is obsolete now)
Aim of this page : Description and example of grib2 files that we expect from partners.
...
parameter
( WMO GRIB2 - TABLE 4.2-10-0)
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Number
...
time
(grib2/tables/2/4.4.table)
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165.128
...
. regular lat-long grid
. grid spacing free for the contributor to chose
. not need to be global
eg:
gridDefinitionTemplateNumber = 0 [Latitude/longitude]
latitudeOfFirstGridPoint = 90000000
longitudeOfFirstGridPoint = 0
latitudeOfLastGridPoint = -77500000
longitudeOfLastGridPoint = 359500000
iDirectionIncrement = 500000
jDirectionIncrement = 500000
...
I think I should use :
102 Specific altitude above mean sea level
in section 4.
What is your view ?
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166.128
...
229.140
Significant height of combined wind waves and swell
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Significant height of combined
wind waves and swell
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typeOfFirstFixedSurface = 101 [Mean sea level (grib2/tables/5/4.5.table) ]
typeOfSecondFixedSurface = 255
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231.140
...
221.140
Mean wave period based on second moment
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230.140
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Direction of combined wind
waves and swell
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Mean wave direction derived from the vector mean direction from the wave variance spectrum.
WMO tables :
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http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc.shtml
http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-2-10-0.shtml
http://apps.ecmwf.int/codes/grib/format/grib2/ctables/4/5
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