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" <[email protected]>
To: <[email protected]>
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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