[gradsusr] How to Calculate Vector Wind composites using Grads

[gibies george]

Dear Kalyan,

I don't find any scope for technical error on a quick look. If get some
technical error, please mention it.

But, scientifically your methodology is not fair and hence, I have a
suggestion on it.

# use "sum" function instead of "ave" function and finally divide the sum
with total number of days.

There is slight difference between the two procedures since all the break
episodes need not be of same length.



*Gibies George,**Senior Research Fellow (**CSIR)**,*














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On 25 February 2016 at 10:02, kalyan chakravarthy <kalyan4space at gmail.com>
wrote:

> Dear Users,
>
> Good Morning. I want to calculate the vector wind composites during active
> and break periods of monsoon season using grads. Below is the script used
> to calculate the composites. But I think the script doesn't work well.
>
> reinit
> set xlopts 1 3 0.15
> Set ylopts 1 3 0.15
> Set arrowhead -0.4
> sdfopen uwind850mb2009.nc
> sdfopen vwind850mb2009.nc
> set lat -40 30
> set lon 30 120
> set lev 850
> set mpdset rupres
> set background 0
> set display color white
> set map 1 1 15
> set gxout vector
> set cthick 8
> define u1=ave(uwnd,t=31,t=50)
> define v1=ave(vwnd.2,t=31,t=50)
> define u2=ave(uwnd,t=56,t=75)
> define v2=ave(vwnd.2,t=56,t=75)
> define u=(u1+u2)/2
> define v=(v1+v2)/2
> d u;v
> draw title 850mb Composite winds during break period 2009
> printim Breakcomposite2009.jpg
> clear
>
> Thanks & Regards,
> Kalyan
>
>
>
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