Problems on cloud fields

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meteo60
Posts: 104
Joined: Tue Apr 17, 2012 4:50 pm

Re: Problems on cloud fields

Post by meteo60 » Mon Jun 17, 2013 5:38 pm

This is Robert's response:

There was a change in the way cloud fraction is calculated from the beta release (34.beta) and the current EMS.

Specifically, in the beta release I wrote the code for the ARW that calculates cloud fraction based on cloud moisture,
(cloud water + cloud ice mr > 10-6) and relative humidity.

In the new release, I switched to the ZHAO technique that is part of the UPP since that was an accepted method.

I looked at the cloud fields for some cases over the US and they appeared more reasonable than those
from the beta release so I kept the ZHAO code in place for the update.

I will be happy to take another look.


I'm not convinced with this last version, 3.2 had very good results on cloud fields...

rodi
Posts: 57
Joined: Tue Apr 05, 2011 8:00 pm
Location: Genoa - Italy
Contact:

Re: Problems on cloud fields

Post by rodi » Thu Jun 20, 2013 8:57 am

I do confirm. At present time the version 3.2.1.5 it's better than 3.4 about clouds field. As reported on my previous post I thought that the problem was solved but I was wrong.
The new release has some bugs for example using the ARW core I can't plot charts using RIP4 due to an error (NetCDF error in ripdp_wrfarw. Marker = 78.00000) while for NMM core it's OK.
So I've decided to come back to previous version and it's OK.
Rodi

wrfems
Posts: 8
Joined: Mon Jun 07, 2010 7:36 pm
Location: Boulder, Colorado - USA
Contact:

Re: Problems on cloud fields

Post by wrfems » Thu Jun 20, 2013 1:54 pm

Good Morning (Here),

After being prompted & prodded to look into the cloud cover issues again, I did some additional investigating.

As for the line running through the domain, I was not able to replicate the error but in looking at the code I did find a potential bug that could explain the line depicted.

I recompiled the emsupp and put the new binary on-line:

x64 version: http://soostrc.comet.ucar.edu/strc/wrfe ... update.tgz

x32 version: http://soostrc.comet.ucar.edu/strc/wrfe ... update.tgz

To install (from top level of EMS): % tar -xzvf <file>

I'll include it in the next update.

As for the NMM low-level cloud issue, I am also not able to replicate the problem. The NMM low, middle, and high cloud cover fields are calculated within the WRF NMM core and I don't believe it has changed since WRF 3.2.1, so I am perplexed as to the cause of the issue.

You can investigate by using ncview to examine the "CFRACL" field in the wrfprd/wrfout* files to determine whether they look anything like the image depicted

I can keep looking though if necessary.

Send any questions directly to me.

Robert

meteo60
Posts: 104
Joined: Tue Apr 17, 2012 4:50 pm

Re: Problems on cloud fields

Post by meteo60 » Thu Jul 11, 2013 7:23 pm

Hi everybody

I received a new email from Robert, he changed the emsupp and now I do not see any problems on the clouds. I continue testing ...

To DL last emsupp: http://soostrc.comet.ucar.edu/strc/wrfe ... update.tgz

To install (from top level of EMS): % tar -xzvf <file>

delinend
Posts: 65
Joined: Wed Oct 28, 2009 7:07 pm

Re: Problems on cloud fields

Post by delinend » Thu Jul 18, 2013 5:01 am

Hello everybody.

Robert have just released a new EMSUPP here (16-Jul-2013): http://soostrc.comet.ucar.edu/strc/wrfe ... update.tgz

New Things:
* The TCDCpres output, is now in % and not Fractions anymore, regarding WMO GRIB2 Standard. So if you do this in GrADS 'd tcdcprs*100', you have to remove *100
* I don't see the holes in clouds anymore :)

Please try/test it...

Best regards.

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