[RegCNET] 10 km run

[Prodromos Zanis]

Dear Csaba

>From my point of view  the CRU precipitation data is good value for large
domains but for specific regions of Europe is not a "golden rule".
Especially when you look in high resolutions like 10x10 km and in regions
with complex topography. In our domain in Greece, we saw that from
comparisons of precipitation station data in Greece with CRU we had
differences. So I think and I aggree with Gao that for high resolution
simulations for specific domain it is important to compare also with
station data or even better with gridded data produced from precipitation
station data of the region.

best regards
Prodromos Zanis


> Dear RegCM Users,
>
> We just started to use RegCM3 driven by ERA40 2.5 degree resolution ICBC
> data for a European subregion containing the Carpathian Basin and Hungary.
>
> Our grid resolution is 10 km.
>
> In the precipitation pattern we found big biases as compared to the CRU
> data, especially during summer (convective events cause too much
> precipitation). We tried to use both Emanuel and Grell convective schemes,
> but the result was quite the same: the precipition was overestimated by
> the model with a factor of about 2.
>
> We suspect that the 10 km resolution causes this overestimation. Using 25
> km grid resolution the result is much more realistic, but we would like to
> use 10 km grid spacing. Is there any possible solution for this
> overestimation? Any suggestion is welcome!
>
> Thanks in advance.
>
> Kind regards,
> Csaba TORMA
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> RegCNET at lists.ictp.it
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>


-- 
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Dr. Prodromos Zanis
Centre for Atmospheric Physics and Climatology
Academy of Athens
3rd September 131, Athens 11251, Greece
Tel. +30 210 8832048
Fax: +30 210 8832048
e-mail: pzanis at geol.uoa.gr
Web address: http://users.auth.gr/~zanis/
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