[gradsusr] Lapse Rates

[Daniel Nairn]

My field names were correct, it would appear to be an issue with how I
display the scale more than anything else. Its all sorted now though,
thanks again.

On 14 November 2014 17:02, Jeff Duda <jeffduda319 at gmail.com> wrote:

> Daniel,
> I used arbitrary names for the height field. Use 'q file' to check to see
> what the actual name is for the height field in your data (if it even
> exists). Also, check for syntax errors. It looks like I missed a ')' at the
> end of the command.
>
> Jeff
>
> On Fri, Nov 14, 2014 at 2:05 AM, Daniel Nairn <dannairn at gmail.com> wrote:
>
>> Thanks Jeff, I wasn't convinced that my original formula was going to be
>> that accurate.  I've updated my script, as you suggested, for the 700-500
>> lapse rates however the images generated are now blank? The script
>> completes without any errors. If I revert back to my original script then
>> the images are produced as expected.
>>
>>
>>
>> On 13 November 2014 22:59, Jeff Duda <jeffduda319 at gmail.com> wrote:
>>
>>> It would be more accurate if you used the actual height fields at the
>>> pressure levels instead of assuming a fixed height difference.  In other
>>> words, try
>>>
>>> 'define LR75 = (tmpprs(lev=500)-tmpprs(lev=700)) /
>>> (hgtprs(lev=500)-hgtprs(lev=700)'
>>>
>>> for 700-500 mb lapse rates. Note how I flipped the order of the
>>> subtraction from your formula. You'll want to use delta_T = T_upper -
>>> T_lower when computing lapse rates.
>>>
>>> 0-3 km lapse rates can be difficult if you only have isobaric fields.
>>> There are scripts in the script library to interpolate isobaric fields to
>>> constant height fields. If you don't need high accuracy, subbing in a
>>> pressure level that is close to 3 km works. Depending on the time of year,
>>> usually 700 mb is pretty close, but keep in mind that people usually use
>>> 0-3 km ABOVE GROUND LEVEL lapse rates, so in areas of high elevation, 700
>>> mb will be far less than 3 km above ground.
>>>
>>> Jeff Duda
>>>
>>> On Thu, Nov 13, 2014 at 3:53 PM, Daniel Nairn <dannairn at gmail.com>
>>> wrote:
>>>
>>>> Hi
>>>>
>>>> Could somebody please help verify my two GrAds scripts for displaying
>>>> Lapse Rates? I have created two individual scripts, one for displaying
>>>> 700-500mb lapse rates and the other for displaying 0-3km lapse rates, they
>>>> are as follows:-
>>>>
>>>> 0-3 Script
>>>> 'define temp = ((tmpprs(lev=1000)-tmpprs(lev=700))/2.5908)'
>>>>
>>>> 700-500 Script
>>>> 'define temp = ((tmpprs(lev=700)-tmpprs(lev=500))/2.5908)'
>>>>
>>>> They work and seem to verify against other sources but they have been
>>>> pieced together form many Google searches and I'm a little unsure if they
>>>> are accurate/correct :-)
>>>>
>>>> Thank you
>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Jeff Duda
>>> Graduate research assistant
>>> University of Oklahoma School of Meteorology
>>> Center for Analysis and Prediction of Storms
>>>
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>>>
>>>
>>
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>>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
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>
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