[Wrf-users] omlcall & sst_update options

[Megan Mallard]

This issue of calling the sst_update and oml at the same time was discussed
in my Journal of Climate article:
Mallard, Megan S., Gary M. Lackmann, Anantha Aiyyer, Kevin Hill, 2013:
Atlantic Hurricanes and Climate Change. Part I: Experimental Design and
Isolation of Thermodynamic Effects. *J. Climate*, *26*, 4876-4893.

At least in version 3.0.1.1, these two parts of the model code would
overwrite each other's SST fields, so I would not recommend turning them on
at the same time.  The OML is initialized with the first skin temperature
it reads in which is from wrfinput_d01, not wrflowinp_d01.  The OML code
refers to this field as TML0 and it calculates a new field (TML) as a
function of the mechanical mixing of TML0.  Later, a new SST is read in
from wrflowinp_d01 and this new SST and TML both set the skin temperature
over water grid cells at different points in the same timestep.  Of coarse,
this might have changed in subsequent releases, but I believe this
description is still current.

A described in article above, I was able to combine the two features by
modifying the source code so that every time there was an SST update, I
added the OML anomaly from the last 24 to the SST field that had just been
read in from wrflowinp and then restarted the OML this new SST.  So you can
successfully combine them if you do something similar

Megan

On Fri, Mar 14, 2014 at 2:00 PM, <wrf-users-request at ucar.edu> wrote:

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>    1. omlcall & sst_update options (Gino Passalacqua)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 14 Mar 2014 10:22:11 -0700
> From: Gino Passalacqua <gpassala at ucsd.edu>
> Subject: [Wrf-users] omlcall & sst_update options
> To: wrf-users at ucar.edu
> Message-ID: <53233AC3.2030007 at ucsd.edu>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear WRF Users,
>
> I'm trying to understand what exactly happens with the omlcall =1
> (Pollard, Rhines and Thompson 1D Ocean Mixed-Layer Model) and
> sst_update=1 options for WRF V 3.4.1 .
>
>  From the following tutorial (slide 4):
>
> http://www.mmm.ucar.edu/wrf/users/tutor ... hysics.pdf
> <http://www.mmm.ucar.edu/wrf/users/tutorial/hurricanes/AHW_physics.pdf>
>
> I understand that the initial temperature the slab mix layer model comes
> from SST. So if I have sst_update = 1 as well as omlcall=1 on the same
> namelist, I'm assuming that the initial SST comes from the prescribed
> SST given by the file and wrflowinp_d0* . Am I right? What happens if
> there is not a wrflowinp_d0*? Which initial SST the 1D Ocean Mixed-Layer
> Model uses without a wrflowinp_d0* file?
>
> What happens then (let's say on day # 2 of the simulation) with the SST
> that WRF is using as boundary conditions?Is it provided by the 1D Ocean
> Mixed-Layer Model and WRF ignores the wrflowinp_d0* files? A combination
> of both?
>
> I have look for information online and manuals but I have not found
> anything that is that specific.
>
> I would really appreciate if somebody could help me understand what is
> exactly is happening with this two options as I'm trying to design some
> experiments and both options are a key components for them.
>
> Thank you very much,
>
> Gino
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-- 
--------------------------------------------------------------------
Megan S. Mallard, Ph.D.
ORISE Postdoc
US EPA | Office of Research and Development
National Exposure Research Laboratory
Atmospheric Modeling and Analysis Division
Former university email: msgentry at ncsu.edu
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