[ncl-talk] Temp advection, wrf_contour fails
Dennis Shea
shea at ucar.edu
Wed Apr 20 09:59:22 MDT 2016
NOTE: I have not looked at this in detail.
[1]
You could not use 'advect_variable' because it requires "[t]he array *must
be global and ordered south to north*." Also, this assumes a rectilinear
grid (eg: fixed or gaussian)
Your data are not global :-(
Yourhorizontal grid is not rectilinear.
Note: I could change ''advect_variable" which uses spherical harmonics
(hence, the global grid requirement) to derive the horizontal and
latitudinal gradients tusing the 6.4.0
https://www.ncl.ucar.edu/Document/Functions/Contributed/grad_latlon_cfd.shtml
BUT that would take a day or two.
[2]
center_finite_diff "the issue" .. yes and no
The error occurs in center_finite_diff but the issue is, I speculate, the
arguments. Specifically, the use of lat and lon
====
lon = wrf_user_getvar(a,"lon",it)
lat = wrf_user_getvar(a,"lat",it)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Interpolate to isobaric planes
pressure = 850.
tc_plane = wrf_user_intrp3d(tc,p,"h",pressure,0.,False)
z_plane = wrf_user_intrp3d(z_dec,p,"h",pressure,0.,False)
u_plane = wrf_user_intrp3d( u,p,"h",pressure,0.,False)
v_plane = wrf_user_intrp3d( v,p,"h",pressure,0.,False)
; Define variables needed to calculate temp advection
dTdx = center_finite_diff_n(tc_plane,lon,False,0,0)
dTdy = center_finite_diff_n(tc_plane,lat,False,0,0)
===
Maybe,
dTdx = center_finite_diff_n(tc_plane,lon,False,0,1) ; <==
dTdy = center_finite_diff_n(tc_plane,lat,False,0,0)
Or [281] x [353]=>nlat,mlon
dTdx = center_finite_diff_n(tc_plane,lon(nlat/2,:),False,0,0)
dTdy = center_finite_diff_n(tc_plane,lat(:,mlon/2),False,0,0)
Note that NCL's 'dimension reduction' (elimination of degenerate
dimensions), lon(nlat/2,:) and lat(:,mlon/2) are one dimensional.
Use printVarSummary( lon(nlat/2,:) ) to verify
[3]
[2] is a thumb in the dike approach. I think it would be best (if possible)
to calculate
lon_plane =
lat_plane =
dTdx = center_finite_diff_n(tc_plane,lon_plane,False,0,0)
dTdy = center_finite_diff_n(tc_plane,lat_plane,False,0,0)
[4]
Maybe you could send a sample filw (one only) to
ftp ftp.cgd.ucar.edu
anonymous
your_email
cd incoming
put .....
quit
then let ncl_talk know the name of the file.
On Tue, Apr 19, 2016 at 4:21 PM, Mary Haley <haley at ucar.edu> wrote:
> Hi Ryan,
>
> That makes sense why you can't upgrade.
>
> As for the "inf", this is definitely an issue. To further determine where
> the problem is, I suggest doing a printMinMax on the individual variables
> in the calculation:
>
> printMinMax(dTdx,0)
> printMinMax(dTdy,0)
>
> etc.
>
> You may want to do this on every variable that you are getting with
> "wrf_user_getvar" to make sure those all look okay.
>
> If it looks like center_finite_diff is the issue, then revisit the
> documentation to make sure all the input parameters are being input
> correctly:
>
>
> http://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff.shtml
>
> --Mary
>
> On Tue, Apr 19, 2016 at 3:53 PM, Ryan Connelly <rconne01 at gmail.com> wrote:
>
>> Hi Mary,
>>
>> I use NCL that's installed on a shared server where WRF is configured. I
>> don't suspect I have permissions to remove an old version. I recently
>> updated to 6.3.0 on my local machine, but then I have to copy the wrfout
>> over, which is a bit time-consuming since I'm running a triple nest down to
>> 1.333 km! :O
>>
>> These extra commands that you suggested certainly give a clue that I'm
>> not calculating things right:
>>
>> Variable: temp_adv
>> Type: float
>> Total Size: 396772 bytes
>> 99193 values
>> Number of Dimensions: 2
>> Dimensions and sizes: [281] x [353]
>> Coordinates:
>> Number Of Attributes: 1
>> _FillValue : 9.96921e+36
>> (0) min=-inf max=inf
>>
>>
>> 281x353 is my grid size, so that's good, but the infinities probably are
>> not...
>>
>> Thanks,
>> Ryan
>>
>> On Tue, Apr 19, 2016 at 10:38 AM, Mary Haley <haley at ucar.edu> wrote:
>>
>>> Hi Ryan,
>>>
>>> Is there a reason why you don't want to upgrade from V6.1.2? The version
>>> you have is over 3 years old.
>>>
>>> I can't be sure of why your temp_adv variable is not plotting, without
>>> actually being able to run the script.
>>>
>>> However, rather than printing the whole temp_adv array, what does the
>>> following report:
>>>
>>> printVarSummary(temp_adv)
>>> printMinMax(temp_adv,0)
>>>
>>> Sometimes this will give you a clue where the problem is, for example,
>>> your min/max values are off scale, or the size of the array is not what you
>>> were expecting.
>>>
>>> You can also try plotting temp_adv with a basic contour plot call:
>>>
>>> plot = gsn_csm_contour(wks,temp_adv,False)
>>>
>>> just to make sure that the problem isn't with wrf_contour itself.
>>>
>>> --Mary
>>>
>>>
>>> On Mon, Apr 18, 2016 at 12:49 PM, Ryan Connelly <rconne01 at gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Running 6.1.2, so can't use advect_variable without upgrading. So
>>>> instead I have...
>>>>
>>>> ;do it = 12,30,3 ; TIME LOOP
>>>> do it = 12,13,1
>>>>
>>>> print("Working on time: " + times(it) )
>>>> res at TimeLabel = times(it) ; Set Valid time to use on plots
>>>>
>>>>
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>> ; First get the variables we will need
>>>>
>>>> tc = wrf_user_getvar(a,"tc",it) ; 3D tc
>>>> td = wrf_user_getvar(a,"td",it) ; 3D td
>>>> u = wrf_user_getvar(a,"ua",it) ; 3D U at mass points
>>>> v = wrf_user_getvar(a,"va",it) ; 3D V at mass points
>>>> p = wrf_user_getvar(a, "pressure",it) ; pressure is our vertical
>>>> coordinate
>>>> z = wrf_user_getvar(a,"z",it) ; Full model height in meters
>>>> z_dec = z/10. ; Height in decameters
>>>> lon = wrf_user_getvar(a,"lon",it)
>>>> lat = wrf_user_getvar(a,"lat",it)
>>>>
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>> ; Interpolate to isobaric planes
>>>>
>>>> pressure = 850.
>>>>
>>>> tc_plane = wrf_user_intrp3d(tc,p,"h",pressure,0.,False)
>>>> z_plane = wrf_user_intrp3d(z_dec,p,"h",pressure,0.,False)
>>>> u_plane = wrf_user_intrp3d( u,p,"h",pressure,0.,False)
>>>> v_plane = wrf_user_intrp3d( v,p,"h",pressure,0.,False)
>>>>
>>>>
>>>> ; Define variables needed to calculate temp advection
>>>>
>>>> dTdx = center_finite_diff_n(tc_plane,lon,False,0,0)
>>>> dTdy = center_finite_diff_n(tc_plane,lat,False,0,0)
>>>>
>>>> temp_adv = u_plane*dTdx + v_plane*dTdy
>>>>
>>>> print(temp_adv)
>>>>
>>>>
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>>
>>>> ; Plotting options for Tc
>>>> opts = res
>>>> print("Defined ops")
>>>> opts at cnFillOn = True
>>>> print("Turned fill on")
>>>> opts at cnLabelMasking = True
>>>> opts at cnInfoLabelOn = False
>>>> opts at cnLineLabelPerimOn = False
>>>> opts at ContourParameters = (/ -60., 60., 3./)
>>>> print("Accepted contour parameters")
>>>> ;opts at gsnSpreadColorEnd = -3 ; End third from the last color in
>>>> color map
>>>> contour_tc = wrf_contour(a,wks,temp_adv,opts) ; <- Breaks right
>>>> here
>>>> print("wrf_contour called")
>>>> delete(opts)
>>>> print("opts deleted")
>>>>
>>>> print("Got past plotting options for Tc")
>>>>
>>>>
>>>> ; MAKE PLOTS
>>>> ;plot =
>>>> wrf_map_overlays(a,wks,(/contour_tc,contour_td,contour_z/),pltres,mpres)
>>>> plot = wrf_map_overlays(a,wks,(/contour_tc/),pltres,mpres)
>>>> ;plot = wrf_map_overlays(a,wks,(/contour_td,vector/),pltres,mpres)
>>>>
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>>
>>>> end do ; END OF TIME LOOP
>>>>
>>>>
>>>> When it prints out the full grid of temp_adv, or random indexes of the
>>>> array, I get reasonable values and no reason to suspect the grid is
>>>> undefined anywhere. Yet as you can see from my print statements, the call
>>>> to wrf_contour fails. It does not throw an error; it just hangs up. I
>>>> checked with just tc_plane instead, and that completed fine, so it has to
>>>> be an issue with the temp_adv grid I calculated.
>>>>
>>>> Thanks,
>>>> Ryan
>>>>
>>>> --
>>>> Ryan Connelly
>>>> M.S. Student in Atmospheric Sciences, Stony Brook University
>>>> B.S. in Meteorology with Minors in Mathematics and GIS, Valparaiso
>>>> University
>>>> rconne01 at gmail.com
>>>> ryan.connelly at stonybrook.edu
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
>>
>>
>> --
>> Ryan Connelly
>> M.S. Student in Atmospheric Sciences, Stony Brook University
>> B.S. in Meteorology with Minors in Mathematics and GIS, Valparaiso
>> University
>> rconne01 at gmail.com
>> ryan.connelly at stonybrook.edu
>>
>
>
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