[NARCCAP-discuss] why 50km x 50km

[Huang Jianhua]

Thanks Gutowski and Oleksandr for the detailed inputs, which solved my
first question very well. Another question is whether 50 km x 50 km
resolution good enough to catch the pattern of climate variation? In other
words, is the intra-grid variation negligible compared with the inter-grid
variation? Is it verified in any publication?

Thanks for any suggestion.

Jianhua


On Fri, May 24, 2013 at 11:35 AM, Oleksandr Huziy <guziy.sasha at gmail.com>wrote:

> Hello,
>
> since nobody has answered this, I could try to suggest these reasons:
> 1. The resolution is limited by the computational cost, when you decrease
> gridsize, you'll have to decrease the time step (this increases integration
> times enormously, talking from experience, since we're not yet
> parallelizing in time) and when you decrease the grid spacing the number of
> points will increase, since you would still want to cover the same region
> (North America). For example from 200x200 points domain with 50km spacing
> you would get 1000x1000 with 10 km spacing and as far as I know these sizes
> are not available for all institutions (even for the operational tasks (i.e
> short periods) they have become available only recetly)... It'll take a lot
> of time to run, and a lot of space to store...
> 2. The model parameterizations were developed for the rough resolutions and
> not all the models can be easily changed to the higher resolution.
> 3. I would even say that the analysis of the 1000x1000 grid over 30 years,
> with daily resolution is not an easy task...
>
> Cheers
>
> --
> Oleksandr (Sasha) Huziy
>
>
>
> 2013/5/23 Jianhua Huang <jianhua.huangsdu at gmail.com>
>
> > Dear all:
> >
> >
> >
> > Anyone knows why the NARCCAP models choose the 50km x 50km resolution?
> This
> > looks a naïve question, but I was asked in a recent presentation. I
> checked
> > the NARCCAP website thoroughly, but found no answer. Why the resolution
> is
> > 50km x 50km, why not 10km x 10 km? Is 50 km resolution good enough to
> catch
> > the spatial heterogeneity of climate change in the United States?
> >
> >
> >
> > Thanks for any clue or suggestion.
> >
> >
> >
> > Jianhua
> >
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