[ncl-talk] Calculation of Cloud Liquid water path from WRF out file

[Setareh Rahimi]

Hi,

I think it would be better to ask this question from the WRF-Chem forum.
And please have a look at this link.

https://bb.cgd.ucar.edu/cesm/threads/which-variable-is-the-cloud-liquid-water-path.2465/


On Thu, May 2, 2024 at 12:55 PM Anie K Lal via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi all
>
> I am tring to get CLWP from WRF out file.
>
> I tried prcwater_dp as follows:
>
> q1 = f1->QCLOUD[:,:,:,:]; kg/kg
>
> dp_a = wrf_user_getvar(f1,"p",-1)
> dp1 = dp_a[:,:,:,:]; Pa
>
> q1!0 = "time"
> q1!1 = "lev"
> q1!2 = "lat"
> q1!3 = "lon"
>
> dp1!0 = "time"
> dp1!1 = "lev"
> dp1!2 = "lat"
> dp1!3 = "lon"
>
> lwp_a = prcwater_dp (q1(time|:,lat|:,lon|:,lev|: ),
> dp1(time|:,lat|:,lon|:,lev|: ) ; kg/m2
>
> Here I am getting values like
> 27.09562 45.50217 61.3766 68.90879 67.90661 66.62698 64.72494 67.85168
> 64.0595 62.04931 55.23169 42.21736 23.00407... in kg/m2
>
> I also tried wrf_user_getvar(f1,"pw",-1). Here I am getting values like
>
> 5.871577 6.066606 6.3876 6.375202 6.273459 5.973719 6.050189 6.115168
> 6.225941 6.275452 6.347611 6.305155 6.381238 ... in kg/m2
>
> But the realistic values are very small compared to what I am getting,
> based on previous literature:
> To what extents do urbanization and air pollution affect fog? states
> values ~0-160 g/m2
> ACP - Radiative forcing estimates of sulfate aerosol in coupled
> climate-chemistry models with emphasis on the role of the temporal
> variability states values ~0-240 g/m2 and many examples are there. They
> all show clwp in g/m2 which is about 0-300 g/m2 range.
>
> So why I am getting very high values. Are the units in kg/m2 correct for
> the functions 'pw' and prcwater_dp?Or, am I doing something wrong!
>
> Looking forward to any kind of help.
>
> Thank you
> Anie
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-- 
S.Rahimi
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