[ncl-talk] Wrf 3hrs output to daily outputs

[Dennis Shea]

This question is being forwarded to wrfhelp at ucar.edu

---
Good Luck

On Fri, May 1, 2015 at 5:32 AM, Raja Sivaranjan <rajasivaranjan92 at gmail.com>
wrote:

> Dear Madam,
>
> I need to convert wrf 6 hrs outputs to daily ouputs. Is there any ncl code
> to convert wrf 6hrs data to daily data which consider Bucket Option. Major
> variables required are Max and min Temperature( Tmax, Tmin), Rainfall,
> Swdown and Wind Speed.
>
> Below is the description for wrf bucket option
>
> *Buckets in the namelist.input*
>
> The other suggestion is the use of buckets in the &physics section of the
> namelist.input file. Let me explain what that is: if you do not use
> buckets, then the precipitation field keeps accumulating at each timestep.
> This is fine for weather simulations. But if you run WRF for several months
> or several years, then you will end up with a large number for the
> precipitation. So, let's suppose that you need to add 1 mm of rainfall to a
> very large number. Due to rounding errors in computer systems, this 1 mm
> may end up not being added at all. This is where the idea of buckets come
> to place.
>
> When you use buckets, for example of size 100 mm, every time your bucket
> is full, it empties and starts from zero. WRF keeps a count of how many
> buckets you have. It also uses a bucket per grid point.
>
> How do you use buckets in your namelist.input file? Well, in the
> *&physics* section, you should add these options:
>
> *bucket_mm      =  100,*
>
> *bucket_J          =  1.e9,*
>
> Now, remember that when you finish your simulation and you want to
> estimate the precipitation, you will need to multiply the number of buckets
> you have by 100 mm. You will need to perform the following calculations,
> using the variables WRF has separated when you activated the bucket system:
>
> *  RAINC + 100.*I_RAINC*
>
> *RAINNC + 100.*I_RAINNC*
> Need your help
>
> Thanks in advance
> Rajasivaranjan
>
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