[gradsusr] Z levels

[Ricardo Hallak]

Pablo,

as Jeff said, your data seems not to be in pressure levels, but in another
kind of vertical levels (maybe in km with 1 km of vertical spacement).

However, if you are completely sure that your data is in pressure leves,
you shoud discover what are these levels. For example:
z 1 correspond to 1000 hPa
z 2 correspond to  950 hPa
and so on...
After that, you have to write these pressure levels explicitly in the
control file (ZDEF 29 LEV 1000 950 850 800 750 700 ...).
Note that if the data is not in pressure levels, the above ZDEF entry will
produce a wrong level specification. So, after all, check what kind of
vertical level is your data (How have you got the data?)

Regards,

Ricardo



-- 
Prof. Ricardo Hallak
Laboratório de Meteorologia de Mesoescala - LMM
Departamento de Ciências Atmosféricas
Instituto de Astronomia, Geofísica e Ciências Atmosféricas
Universidade de São Paulo

Phone: +55(11)3091-4698

2017-10-23 14:11 GMT-02:00 Pablo Camarena <jcamarena006 at gmail.com>:

>
> If I put set lev 500 and then
> q dims
>
> display:
> lev=500 z=500
>
>
>
>
>
>
> 2017-10-22 15:05 GMT-06:00 L.B. <bcbass2989 at gmail.com>:
>
>> Another option is to set the level based on the pressure value 'set lev
>> (pres lev)', then run 'q dims' and you can find the z value from the
>> results.
>>
>> So for instance, if you want to know what z level the 500mb level
>> corresponds to, do the following two commands:
>>
>> 'set lev 500'
>>
>> 'q dims'
>>
>> *-------*
>> William (L.B.) LaForce IV
>> Meteorologist
>> www.tornadoinsanity.com
>>
>> On Sun, Oct 22, 2017 at 4:55 PM, Pablo Camarena <jcamarena006 at gmail.com>
>> wrote:
>>
>>>
>>> I checked the control file and say:
>>>
>>> zdef   29 linear 1 1
>>>
>>>
>>>
>>> 2017-10-22 14:49 GMT-06:00 Jeff Duda <jeffduda319 at gmail.com>:
>>>
>>>> The correspondence between pressure values and level index is defined
>>>> in the ZDEF line of your control file.
>>>>
>>>> Jeff Duda
>>>>
>>>> On Sun, Oct 22, 2017 at 1:48 PM, Pablo Camarena <jcamarena006 at gmail.com
>>>> > wrote:
>>>>
>>>>>
>>>>> Hello to all,
>>>>>
>>>>> How do I know at what level the values of z correspond?
>>>>>
>>>>> For example z = 1 is at 1000 hPa but if I want to plot at 700 and 500
>>>>> hpa, what value corresponds to z?
>>>>>
>>>>> best
>>>>> JP.
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Jeff Duda
>>>> Post-doctoral research fellow
>>>> University of Oklahoma School of Meteorology
>>>>
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>>>>
>>>
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>>
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>
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