Vertical levels in WRF EMS

Forum dedicated to older versions of EMS package (WRFEMS v3.2, v3.1 or older). Support is user-to-user based, so please help others if you can.
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Antonix
Posts: 260
Joined: Fri Oct 16, 2009 8:53 am

Vertical levels in WRF EMS

Post by Antonix » Fri Oct 22, 2010 11:40 am

Hello everyone
I have a question to ask.
as you change the vertical levels (and their distribution) with DWIZ??
You can do this??

dwillson88
Posts: 11
Joined: Mon Sep 27, 2010 1:22 pm

Re: vertical levels

Post by dwillson88 » Mon Oct 25, 2010 9:24 am

Hi,

You cant change the vertical levels in the dwiz, but you can go to wrfems/conf/ems_run and go to the run_levels.conf folder. In there you can specify the vertical levels by either number of levels or you can directly specify the height of each level in eta coordinates (similar to sigma, terrain following with msl as a reference pressure).

Hope that helps.

Cheers,

David

dwillson88
Posts: 11
Joined: Mon Sep 27, 2010 1:22 pm

Re: vertical levels

Post by dwillson88 » Fri Nov 19, 2010 4:09 pm

Hi guys,

Whilst on the subject of levels does anyone know the eta coordinates for the standard 45 level configuration. I am wanting to keep most levels the same but make them finer close to the ground in the hope of better resolving the wind speed and direction. Or if anyone knows a set of good well representative eta coordinates.

Thanks,

David

Antonix
Posts: 260
Joined: Fri Oct 16, 2009 8:53 am

Re: Vertical levels in WRF EMS

Post by Antonix » Sun Apr 24, 2011 7:27 pm

Hello everyone

I ask myself some questions ...
vore improve the forecasting of wind and soil temperature ...
Using a model to 5 km resolution, 45 vertical levels ... 168 h simulation, NMM core
MBJ + thomson (3.1 wrf)
I thought to increase levels to 55 and vertical thickening of the ground.
I have created with precision for dwiz and copied by hand in the file run_level.conf

do you think is a good idea??

you have other ideas for improving these parameters??

meteoadriatic
Posts: 1567
Joined: Wed Aug 19, 2009 10:05 am

Re: Vertical levels in WRF EMS

Post by meteoadriatic » Mon Apr 25, 2011 9:00 am

Hello, soil temperature would not be affected by number of vertical levels. It will mostly be influenced by short and long wave radiation schemes.

Raising vertical level density will help somewhat in low level temperature and wind predicting.

If you need higher resolutions, I would recommend ARW core. With ARW you can also try different SW/LW radiation schemes and tune them little bit by some parameters...

jpb
Posts: 14
Joined: Thu Jan 28, 2010 7:25 am

Re: Vertical levels in WRF EMS

Post by jpb » Wed May 04, 2011 3:26 pm

Hi

I've investigated the same test, but, when I've tried to modify levels in run_levels.conf, I didn't succeed in having the modified levels into the grib1 or grib2 files after modelling.
How can I check if it is ok in wrfout files, before searching into the wrfpost process.

Regards,
JPB

Nick7K
Posts: 4
Joined: Mon Apr 16, 2018 6:49 am

Re: Vertical levels in WRF EMS

Post by Nick7K » Thu Oct 25, 2018 4:51 am

This thread is the closest I have found to my question.

How do we find the eta levels for the standard 45 levels?

meteoadriatic
Posts: 1567
Joined: Wed Aug 19, 2009 10:05 am

Re: Vertical levels in WRF EMS

Post by meteoadriatic » Thu Oct 25, 2018 8:42 am

Hi, in EMS there is file run_levels.conf where you can read about how to define exact levels heights if you want. If you don't define, program real will distribute them automatically.

If EMS is not used, namelist entry for that option is eta_levels.

Nick7K
Posts: 4
Joined: Mon Apr 16, 2018 6:49 am

Re: Vertical levels in WRF EMS

Post by Nick7K » Thu Oct 25, 2018 7:36 pm

Thank you. Yes, I understand that.

My question is whether there is a way to find out what the automatic levels are.

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