[gradsusr] Difference between sflux var's and pgrb var's

Fri Oct 16 10:31:25 EDT 2015

Chris,

On Fri, Oct 16, 2015 at 9:35 AM, Christopher Gilroy <chris.gilroy at gmail.com>
wrote:

> Hey Wesley,
>
> Yea I found the WMO discipline cat's, very informative. While I can't find
> real specfics on what the current highest-resolution GFS data is, from the
> little bit I've been learning the sflux is? I don't believe sflux and
> pgrb2.0p25 are the same resolution?
>

The GFS model makes an sflux file at the native Gaussian grid (highest
resolution).
Sometimes another jobs can take this highest resolution Gaussian grid and
convert
it to lower resolution Gaussian grid files for jobs that want a lower
resolution file.
The original sflux resolution will change with the model resolution.

The pgrb2.0p25 == pgrb2 0p25   now p -> decimal point
                             pressure-grib2 0.25-degree lat-lon grid
   This file will always be 0.25 x 0.25 degree lat-lon grid.

>
> Thanks for the descriptive info on the two vars. They seemed the same to
> me, but with the descriptions being a tad different and the disciplines
> being different I didn't think they were identical.
>

They should be the same physical field except for a change in the grid and
perhaps
a change in the timing.  I wouldn't be surprised if the sflux file goes to
the more modern
tsoil name. WMO has deprecated many variables which are in the wrong
discipline.

Wesley

>
> On Fri, Oct 16, 2015 at 9:11 AM, Wesley Ebisuzaki - NOAA Federal <
> wesley.ebisuzaki at noaa.gov> wrote:
>
>> Hi,
>>
>> tmp0_10cm is the temperature 0-10 cm below the land surface
>> (discipline=meteorological product)
>> tsoil0_10cm is the soil temperature 0-10 cm below the land surface
>> (discipline=land surface product)
>>
>> Logically both variables refer to the same quantity.  Originally people
>> used the 1st name because
>> the 2nd name wasn't defined.  Later the standard defined temperature for
>> land-surface, oceanographic,
>> hydrological and space-weather products.  So the 2nd name is more
>> descriptive and the
>> the new preferred name.  The "0,0,0" vs "2,0.2" is because the encoding
>> of the two names are
>> different (discipline, parameter category and parameter number).
>>
>> sflux = special flux, usually on (model) Gaussian grid
>> pgrb2 = pressure (level) grib2 (often includes contents of sflux file),
>> usually on a lat-lon grid
>>
>> Wesley
>>
>>
>> On Fri, Oct 16, 2015 at 12:27 AM, Christopher Gilroy <
>> chris.gilroy at gmail.com> wrote:
>>
>>> Hey guys, learning grads (let alone model data) and I'm trying to figure
>>> out the difference between:
>>>
>>> sflux:
>>> tmp0_10cm  0,106,0,0.1   0,0,0 ** 0-0.1 m below ground Temperature [K]
>>> tmp10_40cm  0,106,0.1,0.4   0,0,0 ** 0.1-0.4 m below ground Temperature
>>> [K]
>>> tmp40_100cm  0,106,0.4,1   0,0,0 ** 0.4-1 m below ground Temperature [K]
>>> tmp100_200cm  0,106,1,2   0,0,0 ** 1-2 m below ground Temperature [K]
>>>
>>> pgrb2:
>>> tsoil0_10cm  0,106,0,0.1   2,0,2 ** 0-0.1 m below ground Soil
>>> Temperature [K]
>>> tsoil10_40cm  0,106,0.1,0.4   2,0,2 ** 0.1-0.4 m below ground Soil
>>> Temperature [K]
>>> tsoil40_100cm  0,106,0.4,1   2,0,2 ** 0.4-1 m below ground Soil
>>> Temperature [K]
>>> tsoil100_200cm  0,106,1,2   2,0,2 ** 1-2 m below ground Soil Temperature
>>> [K]
>>>
>>> They somewhat look the same, but the third set of number 0,0,0 and 2,0,2
>>> are different obviously, so outside of what "differences" there are between
>>> the 2, can anyone explain what the 0,0,0 and 2,0,2 actually means?
>>>
>>> Secondly, what exactly (maybe why they have so many different types is
>>> better) is the difference between the gfs sflux files and the gfs pgrb2
>>> files? I know the sflux files don't have all the var's that the pgrb2 files
>>> have but the sflux is the highest resolution data available, for the GFS,
>>> correct?
>>>
>>> I appreciate any help.
>>>
>>> Thanks!
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
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>>
>
>
> --
> -Chris A. Gilroy
>
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