Comments (9)
dudhia
commented on June 1, 2024
The default value works with the default p_top of 50 hPa.
Going to 1 hPa would probably need at least 56 levels according to a table
I had,
Jimy
…On Thu, May 24, 2018 at 3:16 PM, Michael Duda ***@***.***> wrote:
With the default namelist.input file for ARW real-data cases, I get the
following error when trying to run real.exe with metgrid output produced
from GFS data going up to 100 Pa:
d01 2016-12-29_00:00:00 You need one of four things:
d01 2016-12-29_00:00:00 1) More eta levels: e_vert
d01 2016-12-29_00:00:00 2) A lower p_top: p_top_requested
d01 2016-12-29_00:00:00 3) Increase the lowest eta thickness: dzbot
d01 2016-12-29_00:00:00 4) Increase the stretching factor: dzstretch_s or dzstretch_u
d01 2016-12-29_00:00:00 All are namelist options
Increasing the value of e_vert to 35 resolved the issue.
Should we consider increasing e_vert in the default namelist.input file?
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dudhia
commented on June 1, 2024
OK, I see that the default is 30 levels. That should be fixed. 33 is the
minimum that works,
Jimy
…On Thu, May 24, 2018 at 3:20 PM, Jimy Dudhia ***@***.***> wrote:
The default value works with the default p_top of 50 hPa.
Going to 1 hPa would probably need at least 56 levels according to a table
I had,
Jimy
On Thu, May 24, 2018 at 3:16 PM, Michael Duda ***@***.***>
wrote:
> With the default namelist.input file for ARW real-data cases, I get the
> following error when trying to run real.exe with metgrid output produced
> from GFS data going up to 100 Pa:
>
> d01 2016-12-29_00:00:00 You need one of four things:
> d01 2016-12-29_00:00:00 1) More eta levels: e_vert
> d01 2016-12-29_00:00:00 2) A lower p_top: p_top_requested
> d01 2016-12-29_00:00:00 3) Increase the lowest eta thickness: dzbot
> d01 2016-12-29_00:00:00 4) Increase the stretching factor: dzstretch_s or dzstretch_u
> d01 2016-12-29_00:00:00 All are namelist options
>
> Increasing the value of e_vert to 35 resolved the issue.
>
> Should we consider increasing e_vert in the default namelist.input file?
>
> —
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> <#557>, or mute the thread
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mgduda
commented on June 1, 2024
Sorry... I should have been more clear: I'm requesting the default p_top of 5000 Pa. I only mentioned that I have GFS levels up to 100 Pa to alleviate any concerns that I had insufficient levels in the metgrid files.
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kkeene44
commented on June 1, 2024
@dudhia
Do we want this default value to be 33 or 35? or maybe something even higher?
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davegill
commented on June 1, 2024
Folks,
There are a couple of points that I see in this discussion.
- Michael, are you asking if we can just remove the p_top_requested from the namelist entirely? The reasonable default in the Registry is 50 hPa. If that is the request, I agree with removing settings that most users do not need to modify.
- For our em_real namelists, there are several that we should bump up the number of vertical levels, from 30 to perhaps 35.
> grep e_vert namelist.input* | grep 30
namelist.input: e_vert = 30, 30, 30,
namelist.input.diags: e_vert = 30, 30, 30,
namelist.input.jan00: e_vert = 30, 30, 30,
namelist.input.jun01: e_vert = 30, 30, 30,
namelist.input.ndown_1: e_vert = 30, 30, 30,
namelist.input.ndown_2: e_vert = 30, 30, 30,
namelist.input.ndown_3: e_vert = 30, 30, 30,
namelist.input.volc: e_vert = 30, 30, 30,
- Jimy is working on a table of user-selected p_top and an appropriate value for e_vert.
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mgduda
commented on June 1, 2024
@davegill I'm not suggesting we remove p_top_requested. I'm suggesting we increase the value of e_vert so that the default namelist.input file works.
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davegill
commented on June 1, 2024
@mgduda
Michael,
Gotcha. Out default setup should actually work
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dudhia
commented on June 1, 2024
Yes, we normally recommend the minimum one that works, which is 33 with
default level settings and p_top=50 hPa.
Jimy
…On Thu, May 24, 2018 at 4:29 PM, Dave Gill ***@***.***> wrote:
@mgduda <https://github.com/mgduda>
Michael,
Gotcha. Out default setup should actually work
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davegill
commented on June 1, 2024
Folks,
I'll get a PR that ONLY does this em_real e_vert modification, where the value of 30 is bumped up to 33. I have never linked a PR and an issue.
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