[ncl-talk] ncl-talk Digest, Vol 135, Issue 22

[Negin S]

Dear Mary,

Thanks so much for your email and useful information.
Is there any example of extracting flight data using NCL codes? I need to
do extract the data using post-processing tools. I need to do interpolation
over time and layers(height).

I appreciate your helps.

Best Regards,
Negin

On Tue, Feb 17, 2015 at 1:36 PM, Mary Barth <barthm at ucar.edu> wrote:

>  Hi Negin,
>
> For doing the same thing as you, I have found the model level by using the
> WRF height array ("z") that you can get from wrf_getvar routine.
>
> It is also possible to create an output file from WRF-chem of variables
> along a flight track. Here is some more info:
>
>  “Tracking”  output:  vertical  profiles  of  prescribed  meteorological
> and  chemical
> species  at  a  set  of  prescribed  times  and  horizontal  coordinates
> are  written  to  a
> special  output  file,  wrfout_track_d<nn>.    The  namelist  variable
> track_loc_in  is  a
> count  of  the  track  locations  and  must  be  set  to  a  positive
> value  otherwise  the  default
> setting  of  zero  will  result  in  no  track  output  of  any
> variables.    Times  and  locations
> must  be  specified  in  the  file  wrfinput_track.txt(  see  example
> below).  Meteorological
> variables  z,  p,  t,  u,  v,  w,  alt,  qcloud,  qrain,  qice,  qsnow,
> qgraup,  and  qvapor  are  output
> if  track_loc_in  is  non-­zero.    Chemical  species  concentrations
> may  also  be  output  if
> both  namelist  variables  track_chem_num  and  track_chem_name  are
> set.    The  total
> number  of  chemical  species  to  output  must  be  <=  100.
>
> As  an  example  the  following  namelist  settings  will  output  the
> default  meteorological
> variables  and  co  and  o3  species  concentrations  at  the  two  times
> and  locations
> specified  in  the  wrfinput_track.txt  file  :
>
> &domains
> track_loc_in  =  2,
> /
> &chem
> track_chem_num  =  2,
> track_chem_name  =  ‘co’,  ‘o3’,
> /
>
> The  following  two  lines  comprise  the  contents  of  the  ascii
> input  file
> wrfinput_track.txt:
>
> 2010-­08‐10_00:12:00  41.450  -­87.300
> 2010‐08‐10_00:36:00  41.510  -­87.390
>
> This  will  result  in  the  indicated  variables  being  output  to
> wrfout_track_d01  at  the
> times  00:12:00  UTC  and  00:36:00  UTC  on  August  10,  2010  at  the
> grid  points  nearest
> to  the  points  (41.450, -­87.300)  and  (41.510, -­87.390).    Note
> that  the  tracking  tool
> does  not  interpolate  in  time.  The  indicated  output  times  need
> to  be  given  in
> multiples  of  model  time  steps  else  no  output  is  produced.
> The  exact  Fortran  format  for  the  lines  in  the  file
> wrfinput_track.txt  is
> (A19,1X,F7.3,1X,F7.3)  and  the  horizontal  coordinates  are  ordered
> for  latitude,
> longitude  with  standard  WRF  conventions  wherein  south  latitudes
> and  west
> longitudes  are  negative.
>
> This information is from
> http://www.acd.ucar.edu/wrf-chem/MOZCART_UsersGuide.pdf
>
> -- Mary Barth
>
> On 2/17/15 12:00 PM, ncl-talk-request at ucar.edu wrote:
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 16 Feb 2015 23:45:34 -0600
> From: Negin S <negin513 at gmail.com> <negin513 at gmail.com>
> Subject: [ncl-talk] flight pathway data
> To: Ncl Talk <ncl-talk at ucar.edu> <ncl-talk at ucar.edu>
> Message-ID:
> 	<CAJpVDhqVPP-5sXWZ2saDg4vpE4OxcWK8LcN7nwgk_gtRN99X7Q at mail.gmail.com> <CAJpVDhqVPP-5sXWZ2saDg4vpE4OxcWK8LcN7nwgk_gtRN99X7Q at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Everyone!
>
> Recently I am working on extracting data along a flight pathway.
>
> I used the following for figuring out grid index of flight data across its
> pathway:
>
> nm = getind_latlon2d (lat2d,lon2d, lat, lon)
>
> do k=0,dimsizes(lat)-1
>      n = nm(k,0)
>      m = nm(k,1)
> end
>
> but I also need some help calculating the layer number based on flight
> altitude and time step based on flight time.
> I could not find any example for extracting data along flight pathway.
>
> Basically what I wanted to do is to extract data along flight pathway from
> model output(i.e. wrf-chem output) and write all the variables from model
> in a txt file.
>
> I highly appreciate all your helps.
>
> Best Regards,
> Negin
>
>
>
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