[wrfems] temperatures crashing during night over water
rozumal at ucar.edu
Thu Oct 27 11:24:23 MDT 2011
Kurt and Bryan,
No action taken other than my spending 2 days debugging the code looking
for the source of the
problem in vain.
I'll continue to look for the next release or maybe it will hopefully
resolve itself when I do the testing.
On 10/27/2011 11:13 AM, Kurt Mayer wrote:
> Bob sent out an email about this back in May... don't know if any
> action has taken place since then.
> I appreciate the users who brought this problem to my attention.
> There appears to be a bug in the latest version of the WRF EMS (the
> WRF itself actually)
> in that using the default setting for SST_SKIN (ON) in
> run_physics.conf will result in excessive
> decreases in the skin temperature over water.
> Change SST_SKIN = 0 (OFF) in your wrfems/conf/ems_run/run_physic
> and wrfems/runs/<domain>/conf/ems_run/run_physics.conf files - ASAP
> A test simulation over the Gulf of Mexico showed water temperatures
> decreasing from 80F (28C)
> to less than 50F (10C) within a few hours after nightfall. Setting
> SST_SKIN = 0 corrected this
> On Thu, Oct 27, 2011 at 12:05 PM, Bryan Mroczka
> <Bryan.Mroczka at noaa.gov <mailto:Bryan.Mroczka at noaa.gov>> wrote:
> I have been playing around with the EMS3.2beta release and have
> had some issues with my overnight 2meter temperatures over
> water/ocean. As soon as the model thinks the sun has set, it
> begins a rapid downward trend in the temps over the water. This
> eventually leads in a short time to some very unrealistic values.
> The issue seems to be related to the SST_SKIN variable. The
> default in the run_physics.conf file states that this should be
> set to 1. However, when I reset this variable to 0, the issue of
> low level temps over water goes away. I have tried several
> different short/long radiation options, always with basically the
> same result.
> Can anyone think of why this may be occurring with the SST_SKIN=1
> variable set. I have attached my run_physics.conf file in hopes
> that someone might see a conflict in my configuration.
> WFO Tallahassee, FL
> _Bryan Mroczka_
> bryan.mroczka at noaa.gov <mailto:bryan.mroczka at noaa.gov>
> National Weather Service - Tallahassee, FL
> wrfems mailing list
> wrfems at comet.ucar.edu <mailto:wrfems at comet.ucar.edu>
> wrfems mailing list
> wrfems at comet.ucar.edu
Robert A. Rozumalski, PhD
NWS National SOO Science and Training Resource Coordinator
COMET/UCAR PO Box 3000 Phone: 303.497.8356
Boulder, CO 80307-3000
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