Subject: Re: sea ice and topo.nc
From: Erik Kluzek (erik@ucar.edu)
Date: Tue Jan 22 2002 - 09:50:01 MST
On Tue, 22 Jan 2002, Gudrun Nina Petersen wrote:
>
> Dear colleagues!
>
> When changing the resolution from T42, using interpic and definesurf,
> I noticed that I no longer have sea ice as a possible surface type,
> just land and ocean. The reason is that the high resolution
> topography dataset, topo.nc, only has land/no-land topography flags.
>
> Does anyone know how to regain the sea ice information?
>
Gudrun
Actually you are fine as it is. Sea-ice is kept as a flag
value on the SST dataset. In other words any value that equals
-1.8C on the SST dataset indicates that that grid-square for that
particular month is covered with sea-ice. Now, it is true that
the initial condition files, may contain ORO that indicates where
sea-ice is. But, UNDERSTAND THAT AS FAR AS SEA-ICE IS CONCERNED
THE INITIAL-CONDITION DATASET IS IGNORED AND THE SST DATASET IS
USED. So it really doesn't matter that your interpolated initial
condition file doesn't have sea-ice on it. All that matters is
that your SST dataset has sea-ice flagged on it. And provided
you used "intersst", to interpolate the SST dataset to the resolution
you wanted -- this will be the case.
Erik Kluzek, (CGD at NCAR)
National Center for Atmospheric Research
Boulder CO, (off) (303)497-1326 (fax) (303)497-1324
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