Dear ncdigest users,
Wish you and your family happy new year .
T.V.Ramana Murty & Family (srilata, siva kumar)
ncdigest wrote:
> ncdigest Monday, December 23 2002 Volume 01 : Number 673
>
> Today's Topics:
> New standard name table for the CF netCDF convention
>
> ----------------------------------------------------------------------
>
> Date: Mon, 23 Dec 2002 10:21:58 +0000
> From: Jonathan Gregory <jonathan.gregory@xxxxxxxxxxxxx>
> Subject: New standard name table for the CF netCDF convention
>
> New standard name table for the CF netCDF convention
>
> Under the CF metadata home page http://www.cgd.ucar.edu/cms/eaton/cf-metadata/
> we have posted a new version of the CF standard name table. (The standard name
> table specifies standardized names for distinct physical quantities, as
> described in section 3.3 of the CF convention.) The first draft was originally
> posted early in 2001, but few comments were received until 2002. In the new
> version, we have made extensive changes to take these comments into account,
> in
> particular to use shorter names where possible and to adopt more usual
> phraseology.
>
> In the two years since the draft was published, users of the CF convention may
> have begun to use the draft standard names. We have therefore also provided an
> equivalence table to the new names for those which have changed. We also
> describe the changes and the reasons for them. For simplicity, we would like
> to
> regard the superseded names as obsolete. However, in cases where this would
> cause you great inconvenience, we could define the old names to be aliases for
> the replacement ones. A mechanism to do this has already been proposed in the
> CF convention. Please post to the CF-metadata group stating which superseded
> names you would like to be retained.
>
> We propose that all standard names in the table on 31 January 2003 will be
> permanently valid. None will be made obsolete after that date. Future changes
> will require aliases to be introduced for backwards compatibility.
>
> The new standard name document provides explanatory comments for many standard
> names. We have also supplied tables of equivalences to PCMDI variable names
> and
> ECMWF and NCEP GRIB codes. These other parameter lists specify some quantities
> which for a complete definition require metadata in addition to the
> standard_name, as shown in the equivalence tables. The equivalences for the
> NCEP private GRIB codes (>127) have not yet been included, and there are a few
> other holes that will be filled. We will shortly propose a standardized method
> for distinguishing between an annual and a decadal standard deviation, which
> is
> needed in the PCMDI table and will be more generally useful. It would be very
> helpful if those familiar with PCMDI, ECMWF or NCEP conventions could check
> the
> equivalences which have been completed. In addition, we would welcome answers
> to the questions appended, which show our ignorance and/or the lack of clarity
> in the parameter tables!
>
> According to the CF convention, the primary definition of the standard name
> table is given in XML. The XML version will be made available soon.
>
> Thanks to all for comments on the CF conventions. Continued discussion is most
> welcome. Happy New Year.
>
> Jonathan Gregory and Brian Eaton
>
> * Is pseudoadabatic potential temperature the same thing as pseudoequivalent
> potential temperature?
>
> * What is Montgomery streamfunction (GRIB code 37)?
>
> * What is the distinction between absolute and relative divergence (GRIB codes
> 42 and 44)?
>
> * Are GRIB codes 15 and 16 *daily* max and min temperature, as we have
> assumed? If not daily, then what?
>
> * Is vorticity (ECMWF GRIB code 138) relative or absolute?
>
> * Is log surface pressure (ECMWF GRIB code 152) natural or common log? In what
> units is the pressure?
>
> * Is there a quantitative definition of "deep soil" in ECMWF GRIB codes 170,
> 171, 183 and 184?
>
> * In view of the note to the GRIB table which reads "Net (vertical) fluxes
> shall be calculated by subtracting the downward flux values from the upward
> flux values" we have assumed that they are positive upward. Is this correct?
>
> * What is ICAO standard atmosphere reference height (NCEP GRIB code 5)?
>
> * What are the parcel and best lifted indexes (NCEP GRIB codes 24 and 77)?
>
> * NCEP GRIB code 89 is "density" of what?
>
> * What are the precise definitions of the radar spectra (GRIB codes 21-23),
> wave spectra (28-30), thermocline depths (68-70), primary and second wave
> directions and periods (107-110), image data (127), atmospheric tide (128) and
> budget values (129)?
>
> * What is the difference between PCMDI variables cl "cloud amount" and clt
> "total cloud amount"?
>
> * What is PCMDI variable mrsofcs "surface soil moisture field capacity" a
> percentage of?
>
> * Are PCMDI net radiative fluxes upward or downward? We have assumed upward.
>
> * What is the "model top" in PCMDI variable rtmt? In what way is it different
> from TOA?
>
> ------------------------------
>
> End of ncdigest V1 #673
> ***********************
>From owner-netcdfgroup@xxxxxxxxxxxxxxxx Thu 2 2003 Jan 17:03:35
Date: Thu, 2 Jan 2003 17:03:35 -0800 (PST)
From: Charlie Zender <zender@xxxxxxx>
To: NCO Announce Mailing List <nco-announce@xxxxxxxxxxxxxxxxxxxxx>,
Subject: NCO 2.7.0
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Reply-To: Charlie Zender <zender@xxxxxxx>
Hi,
NCO 2.7.0 is available from http://nco.sf.net
New features include multiple hyperslabbing ("multi-slabbing")
with ncks (thanks to Henry Butowsky), and support for GNU/POSIX long
options (thanks to Rorik Peterson). Multislabbing efficiently
extracts non-uniformly spaced hyperslabs. Simply specify multiple
hyperslabs for each dimension at one time, e.g.,
ncks -d species,0,1 -d species,5 -d lon,0,4 -d lon,2,9,2 in.nc out.nc
The returned hyperslab is the union of individual specifications.
See the User's Guide for more details.
Enjoy,
Charlie
--
Charlie Zender, zender at uci dot edu, (949) 824-2987, Department of
Earth System Science, University of California, Irvine CA 92697-3100
