<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>
<div><span style="font-size:14px;">Hi Marc,</span></div>
<div> </div>
<div><span style="font-size:14px;">From my recalls you also should remove topography for HGT_U & HGT_V to get</span></div>
<div><span style="font-size:14px;">ocean level instead of terrain. You definitely get topography 0 from the restart files</span></div>
<div><span style="font-size:14px;">as these data are obtained from HGT_M.</span></div>
<div> </div>
<div><span style="font-size:14px;"><span style="font-family: arial, helvetica, sans-serif; line-height: normal;">Dr Mikhail Titov</span><br style="font-family: arial, helvetica, sans-serif; font-size: 12px; line-height: normal;"/>
<span style="font-family: arial, helvetica, sans-serif; line-height: normal;">Principal modeling Consultant, </span><br style="font-family: arial, helvetica, sans-serif; font-size: 12px; line-height: normal;"/>
<span style="font-family: arial, helvetica, sans-serif; line-height: normal;">Aurecon Ltd., New Zealand</span><br style="font-family: arial, helvetica, sans-serif; font-size: 12px; line-height: normal;"/>
<span style="font-family: arial, helvetica, sans-serif; line-height: normal;">http://www.aurecongroup.com</span></span></div>
<div> </div>
<div> </div>
<div>
<div name="quote" style="margin:10px 5px 5px 10px; padding: 10px 0 10px 10px; border-left:2px solid #C3D9E5; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div style="margin:0 0 10px 0;"><b>Sent:</b> Wednesday, July 29, 2015 at 6:45 AM<br/>
<b>From:</b> "Marcella, Marc" <MMarcella@AIR-WORLDWIDE.COM><br/>
<b>To:</b> "wrf-users@ucar.edu" <wrf-users@ucar.edu><br/>
<b>Subject:</b> [Wrf-users] properly removing topography from a restart simulation?</div>
<div name="quoted-content">Hi wrfusers,<br/>
<br/>
I am trying to remove topography over Taiwan in a WRF simulation where I restart from a prior run to simulate the effects on a typhoon traversing the region. The procedure I follow is to remove the topography (HGT_M, VAR_SSO, and SLOPECAT variables) in geogrid, re-run metgrid.exe, then re-run real.exe. I checked the geo.nc, met.nc files, and the real input files---all show the topography variables over the region as zeroed out. I then am sure to remove the topography from the wrfrst.nc file that the simulation is restarting from.<br/>
<br/>
When I run the model however, the results do look slightly different than a simulation with topography but not significant given the drastic change (from having topo go from 3km to 0km). Similarly, the results still show a barrier of sorts when the wind/rainfield comes ashore. When I check the restart files created after the fact, I see that the topography is still 0 but the surface pressure over the island appears as if mountains are there as it is very low (~800mb) as is the sfc pressure in the met_em.nc files. My question is, am I properly removing the topography? Or are there other variables that also must be zeroed out to mimic a 0km island? And, is there some other definitive check I can perform to ensure that this simulation is actually not seeing the topography?<br/>
<br/>
Any help would be greatly appreciated.<br/>
<br/>
Thanks,<br/>
Marc<br/>
_______________________________________________<br/>
Wrf-users mailing list<br/>
Wrf-users@ucar.edu<br/>
<a href="http://mailman.ucar.edu/mailman/listinfo/wrf-users" target="_blank">http://mailman.ucar.edu/mailman/listinfo/wrf-users</a></div>
</div>
</div>
</div></div></body></html>