[CF-metadata] ECMWF GRIB code - CF Standard Name Mapping incorrect?

From: TOYODA Eizi <toyoda>
Date: Wed, 2 Feb 2011 20:31:12 +0900

Hi,

For GRIB Edition 1, the meaning of parameter number 137 depends on
originating center (98 = ECMWF in this case) and version number of GRIB
table (indicated at octet 4 of Section 1). It's completely up to ECMWF to
define it, but my understanding is that tables coming with GRIB-API software
is reliable source:

  Version Units Name
  128 kg.m-2 Total_column_water_vapour
  129 kg.m-2 Total_column_water_vapour
  151 m Depth
  160 kg.m-2 Precipitable_water_content

Regarding spelling in CF, the authentic source should be
http://cf-pcmdi.llnl.gov/documents/cf-standard-names/standard-name-table/current/cf-standard-name-table.html/
which says "vapor".

-- 
TOYODA Eizi
----- Original Message ----- 
From: "Malm Jakob" <jakob.malm at smhi.se>
To: <cf-metadata at cgd.ucar.edu>
Sent: Wednesday, February 02, 2011 5:29 PM
Subject: [CF-metadata] ECMWF GRIB code - CF Standard Name Mapping incorrect?
> There are differences between the CF standard names on
>
> http://cf-pcmdi.llnl.gov/documents/cf-standard-names/ecmwf-grib-mapping
> [CF document]
>
> and
>
> http://www.ecmwf.int/publications/manuals/d/gribapi/param/  [ECMWF
> site]  (click on the netcdf link for any particular parameter)
>
> E.g. tcwv:
>
> [CF document]:
> GRIB code      Units ECMWF     CF   ECMWF description             CF
> Standard Name
> 137            m (of water)    m    Precipitable Water Content
> lwe_thickness_of_atmosphere_water_vapour_content
>
> [ECMWF site]
> (http://www.ecmwf.int/publications/manuals/d/gribapi/param/detail/format=netcdf/pid=137/):
> paramId      137
> shortName    tcwv
> name         Total column water vapour
> unit         kg m**-2
> description  Vertically integrated water vapour
> cfname       lwe_thickness_of_atmosphere_water_vapor_content
>
> The most important difference is the units, where the CF document says
> 'm', and ECMWF says 'kg m**-2' (which is the correct unit for the tcwv
> parameter). Does the ECMWF parameter have an incorrect CF name or are
> the units in the CF document wrong?
>
> I am also puzzled to see the spelling 'vapour', because I thought that
> the American spellings (vapor, color...) were the CF standard.
>
>
> Jakob Malm
> SMHI
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Received on Wed Feb 02 2011 - 04:31:12 GMT