<div dir="ltr"><div>Dear wrf-users,<br></div>we're attempting to assimilate both conventional
observations (METAR/SYNOP/RAOB) and observed surface data (2 m
temperature and 10 m wind) with sensors on board of commercial ships in
the Mediterranean area.<br>
We want to evaluate the impact of ships derived data in an OSSE
(Observing System Simulation Experiments) framework, where the
horizontal resolution of the "virtual" truth is 1 km and the resolution
of the numerical experiments is 3 km.<br>
<br>Using a custom background error (with method NMC) we have the following issue:<br>in
the interface between sea and land we observe an anomalous heating of
the land near the harbors where the ships record the data.<div>
Clearly these data affect improperly the assimilation.<br><br></div><div>Is anybody facing the same problem?<br></div><div>Thanks, Valerio<br></div><div>PS: WRF and WRFDA version is 3.5<br></div><div class="gmail_extra">
<br><br><br><br><br><div class="gmail_quote">On 13 February 2012 16:55, Sean Crowell <span dir="ltr"><<a href="mailto:sean.crowell@noaa.gov" target="_blank">sean.crowell@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi, I am running WRF and WRFDA version 3.3.1 for an OSSE and I am<br>
getting some pretty large errors over bodies of water. The inclusion<br>
of surface obs improves the analysis almost everywhere else (over a<br>
control run with no assimilation). Are there any water specific<br>
settings in the WRFDA process? I have the line "iswater = 16" in my<br>
namelist for updating the lower boundary condition file, and in my WRF<br>
namelist, I haven't changed the land use to MODIS, so far as I can tell.<br>
<br>
Is there any other obvious reason why the assimilation would degrade<br>
the solution over bodies of water?<br>
<span class="HOEnZb"><font color="#888888"><br>
Sean Crowell<br>
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</font></span></blockquote></div><br><br clear="all"><br>-- <br><font face="Calibri"><font face="Calibri"><font face="Calibri"><font><span style="font-family:arial,helvetica,sans-serif">Valerio Capecchi</span><br style="font-family:arial,helvetica,sans-serif">
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