[ncl-talk] help

[Alan Brammer]

ok, I’ll bite and attempt to answer. 

Assuming you mean this:
Power Dissipation Index (PDI) for a tropical cyclone is defined as, "the sum of the maximum one-minute sustained wind speed cubed, at six-hourly intervals, for all periods when the cyclone is at least tropical storm strength”.


so calculate wind speed. 		https://www.ncl.ucar.edu/Document/Functions/Contributed/wind_speed.shtml
find maximum  				https://www.ncl.ucar.edu/Document/Functions/Built-in/local_max.shtml
cube the maximum value.  		x^3


What your units are and whether they match Emanuels or others is a problem you’ll have to work out. 



##############################
Alan Brammer,
Post-Doc Researcher

Department of Atmospheric and Environmental Sciences,
University at Albany, State University of New York, Albany, NY, 12222
abrammer at albany.edu
##############################

> On 3 Feb 2016, at 09:19, Dennis Shea <shea at ucar.edu> wrote:
> 
> Please do not post the same question.
> 
> The reason for no answer is that no one knows what you mean by "power dissipation". Hence, there is no function.
> 
> On Tue, Feb 2, 2016 at 4:06 PM, Key Tone <keytone25 at gmail.com <mailto:keytone25 at gmail.com>> wrote:
> Hi,
> 
> I was wondering what code/script to use when calculating the power dissipation of this vector plot below?
> 
> <image.png>
> 
> Here is the code for the plot: <image.png>
> 
> Thanks!
> 
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