UKMO PP format

[sandip dhomse]

Hi Pesquero,
please go through the following web page.

In assimlated UKMO data wind components are at different grid than T and
Z(known as an "Arakawa B grid").

Sandip

http://badc.nerc.ac.uk/data/assim/assimhelp.html


      2.3 Resolution

The assimilated data are stored on standard UARS pressure levels from
100hPa to 0.316hPa (approximately 55km). The UARS pressure levels are
given by the following relation:

     / p(i) = 1000 x 10^(-i/6),  i=0 to 21/

The horizontal resolution is the same as the numerical model used for
data assimilation. The model uses a staggered grid (known as an "Arakawa
B grid", so that wind fields are stored on different points from the
other fields.

The wind fields (u,v,w) are on a 2.5 degree (latitude) * 3.75 degree
(longitude) global grid, with the first point at 88.75N, 1.875E ( 72
rows of 96 points making 6912 points in all).



   (88.75,1.875) (88.75,5.625) (88.75,9.375) ... (88.75,358.125)
   (86.25,1.875)  ...           ...          ...  ...
    ...           ...           ...          ...  ...
   (-88.75,1.875) ...           ...          ... (-88.75,358.125)

The other fields (geopotential height and temperature) are on a 2.5
degree (latitude)* 3.75 degree (longitude) global grid, with the first
point at 90.0N, 0E (73 rows of 96 points making 7008 points in all).

   (90,0)     (90,3.75)   (90,7.5)  ....    (90,356.25)
   (87.5,0)    ....        ....     ....     ....
    ....       ....        ....     ....     ....
   (-90,0)     ....        ....     ....    (-90, 356.25)







Diane Stokes wrote:

> José,
>
> I'm sorry.  The files I viewed did not contain u and v components.  I
> can't say why these are not working for you.
>
> Perhaps the links in Richard's msg (quoted at end) will help.
>
>      Diane
>
>
> José Fernando Pesquero wrote:
>
>> Diane,
>>
>> Thanks for your help, it worked to all meteorological fields, except to
>> u e v wind components. Do you know if there is a different treatment to
>> them?
>>
>> Thanks
>>
>> Pesquero
>>
>>
>>> José,
>>>
>>> I've been able to read UKMO PP format data directly in grads.  Special
>>> statements I use in my data descriptor file are:
>>>
>>> options sequential yrev
>>> theader 256
>>>
>>> You'll need to read the header to get the undef, xdef, ydef, tdef info.
>>>
>>>      Diane Stokes
>>>
>>>
>>>
>>> José Fernando Pesquero wrote:
>>>
>>>>  Hi,
>>>>
>>>>
>>>>
>>>>  I have a UK Met Office PP format data, and I would like to use then
>>>>  with the GrADS. Anybody knows how to convert then to some grads
>>>>  format, like grib, nc ou grads binary?
>>>>
>>>>
>>>>
>>>>  Thanks,
>>>>
>>>>  Best Regards,
>>>>
>>>>  Pesquero
>>>>
>
>
> Richard Ellis wrote:
>
>> Hi,
>> There is some software available to convert pp/grib to grads format.
>> The associated web pages are at:
>>
>> http://badc.nerc.ac.uk/help/software/xconv/#convsh
>>
>> http://www.met.reading.ac.uk/~jeff/xconv/
>>
>> Cheers,
>> Richard
>
>
>
> --
> Diane Stokes
> Environmental Modeling Center
> National Weather Service/NOAA
>
>