[ncl-talk] Vertical Cross-section on a rectilinear grid with "degrees-north" units
Barry Lynn
barry.h.lynn at gmail.com
Mon Nov 13 21:44:01 MST 2017
Hi:
You requested:
Dear Barry Lynn
Kindly send me that ncl script that can do the following for wrfoutput
1.extract the upper level variable
2.interpolates it from z coordinate to pressure coordinate with a given
vertical cross section
3.plots the data spatially.for example i want to do this for CAPE
I have included a script that extracts radar from a specialized radar
program. You can adapt it to map whatever variables you want. The program
plots in z coordinates -- the WRF is already in Sigma coordinates (see
example). It could probably be adapted to output data in pressure
coordinates. I believe there are CAPE functions you can access among the
NCL programs, but I am not sure they have output in the vertical coordinate.
Barry
On Mon, Nov 13, 2017 at 5:50 PM, Dennis Shea <shea at ucar.edu> wrote:
> Also, you can not do a *vertical *cross-section with a vertical
> coordinate (p, z, ...)
>
> On Mon, Nov 13, 2017 at 8:30 AM, Barry Lynn <barry.h.lynn at gmail.com>
> wrote:
>
>> Hi:
>>
>> Is there any reason you aren't plotting the vertical cross sections using
>> WRF output directly?
>>
>> Barry
>>
>> On Mon, Nov 13, 2017 at 2:17 PM, Lara Quitián Hernández <
>> laraquitianhernandez at gmail.com> wrote:
>>
>>> Good afternoon,
>>>
>>> I'm trying to plot a vertical cross-section of a cyclone in order to
>>> analyze its wind shear and, therefore, cyclone tilt.
>>> [image: Imágenes integradas 1]
>>> I've made a re-grid on a rectilinear mesh (e.g., ECMWF grid) of several
>>> WRF simulations. Therefore, one of my outputs is defined as follows:
>>>
>>> File "SPD_regrid_d02_D19_416.nc"
>>>
>>> File type: NetCDF-3/CDM
>>> ------------------------------
>>>
>>> netcdf file:/Volumes/MyPassport/SPD_regrid_416.nc {
>>> dimensions:
>>> times = UNLIMITED; // (0 currently)
>>> time = 7; (7 time-steps)
>>> lat = 141;
>>> lon = 201;
>>> ncl4 = 7;
>>> latitude = 141;
>>> ncl6 = 201;
>>> variables:
>>> float spd(time=7, lat=141, lon=201);
>>> :_FillValue = 9.96921E36f; // float
>>>
>>> int time(time=7);
>>>
>>> float lat(lat=141);
>>> :units = "degrees_north";
>>> :long_name = "latitude";
>>> :_FillValue = -9999.0f; // float
>>>
>>> float lon(lon=201);
>>>
>>> float latitude(latitude=141);
>>> :units = "degrees_north";
>>> :long_name = "latitude";
>>> :_FillValue = 9.96921E36f; // float
>>>
>>> // global attributes:
>>> :creation_date = "martes, 30 de mayo de 2017, 10:49:07 CEST";
>>> :Conventions = "None";
>>> :source_file = "original-file.nc";
>>> :title = "NCL Simple Approach to netCDF Creation";
>>> }
>>>
>>>
>>> --
>>>
>>> I would like to know, which variable is the best for this purpose
>>> (omega, u-wind, v-wind, equivalent potential temperature (eth), etc.) and
>>> which function should I use in order to represent the vertical
>>> cross-section, taking into account that I do not have pressure levels in
>>> hPa or Pa units, but "degrees-north".
>>>
>>> Thank you very much.
>>>
>>> Sincerely,
>>> Lara
>>>
>>>
>>>
>>> *Lara Quitián Hernández, PhD Student*
>>> Departamento de Física de la Tierra, Astronomía y Astrofísica II
>>> Facultad de Ciencias Físicas
>>> Ciudad Universitaria, Plaza Ciencias, 1
>>> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+128040+Madrid.+Spain&entry=gmail&source=g>
>>> 28040 Madrid. Spain
>>> <https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+128040+Madrid.+Spain&entry=gmail&source=g>
>>> Email: lquitian at ucm.es <mlunar at aemet.es>
>>>
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>> US 914 432 3108 <(914)%20432-3108>
>>
>> _______________________________________________
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>>
>>
>
--
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581
C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
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