[ncl-talk] Vertical Cross-Section

[BasitAli Khan]

Hello,

A couple of years ago I found that in the Vertical cross-sections, NCL does not seems  to plot the few lowest levels (at least WRF data), so I always used well trusted  GrADS for vertical cross-sections. However, this time i have no option but to use NCL and facing the same problem again. Please see the attached plot and the ncl script.

In the attached vertical cross section i have plotted the first 1 km. Height on y-axis and longitude on x-axis. The  horizontal extent from 37.5E to 39.3E  is the sea surface. The white space over the sea surface is actually the data that NCL did not read and put it as missing values in the first two levels. NCL has started plotting data from the 3rd level at 206m Above Sea Surface. The wrfout data form a single point on the sea surface (Longitude 38.0E) is as follows:

Pressure(hPa)
(0) 999.4364
(1) 991.2365
(2) 980.1375
(3) 966.2803
(4) 949.0901
(5) 927.6281

Height (m)
(0) 30.53536
(1) 104.9377
(2) 206.3695
(3) 335.6851
(4) 498.7719
(5) 706.6218

Theta
(0) 302.5804
(1) 308.4214
(2) 312.7661
(3) 316.1294
(4) 317.4146
(5) 317.9083



By looking at the plot it is clear that NCL missed the first two levels and has started plotting data from 206 m onwards. Pressure field is plotted from 980 onwards instead of 999 hPa. Theta contour at the lowest level is 312K while in the wrfout data it is 302.5 K.

Still when i plot the same cross-section with GrADS, i get all the vertical levels and data and the sea-surface (37.5E to 39.3E) is also plotted close to zero

I wonder if any of our NCL /WRF experts (i am cc'ing it to wrfhelp also) can help in fixing this problem.
Thank you in advance for your much appreciated help.

b:)
----
Basit A. Khan, Ph.D.
Postdoctoral Research Fellow
Division of Physical Sciences & Engineering
Office# 3203-CU-12, Level 3, Building 1,
King Abdullah University of Science & Technology
4700 King Abdullah Blvd, Box 2753, Thuwal 23955 –6900,
Kingdom of Saudi Arabia.

Office: +966(0)12 808 0276,  Mobile: +966(0)5 0860 3617
E-mail: basitali.khan at kaust.edu.sa<mailto:basitali.khan at kaust.edu.sa>
Skype name: basit.a.khan

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