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Re: EOF Arctic Oscillation for beginner [message #90537 is a reply to message #90536]

Fri, 06 March 2015 14:37

siumtesfai
Messages: 62
Registered: April 2013

Member

On Friday, March 6, 2015 at 5:19:35 PM UTC-5, David Fanning wrote:
> siumtesfai@gmail.com writes:
>
>> According the website it says
>> Note that my latitude values go from 47.5 to 90.0 degrees of latitude, in 2.5 degree increments. I am going to subtract 1.75 degrees from each of these latitude values, in order to locate the latitudes in the center of the grid, and to avoid multiplying by zero for all the latitudes at 90 degrees.
>>
>> so dlat/2. should be 1.75
>
> I think 1.25 probably makes more sense. :-)
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Thanks

I have used geopotential height at 1000hPa from NCEP/NCAR
I looked at JFM average , and other seasons.
The PC1 looks similar to their website ( http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao _index/JFM_season_ao_index.shtml)

However, when I regress the EOF with PC1 , I do not see dipole structure.

Did I get the method right or somethings is wrong which I do not understand ?

My final answer should be similar to the figure from NOAA website
( http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao _index/ao.loading.shtml)

Thanks for your help

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[Message index]

		EOF Arctic Oscillation for beginner By: siumtesfai on Fri, 06 March 2015 14:03
		Re: EOF Arctic Oscillation for beginner By: David Fanning on Fri, 06 March 2015 14:19
		Re: EOF Arctic Oscillation for beginner By: siumtesfai on Fri, 06 March 2015 14:37
		Re: EOF Arctic Oscillation for beginner By: David Fanning on Fri, 06 March 2015 14:58
		Re: EOF Arctic Oscillation for beginner By: siumtesfai on Fri, 06 March 2015 15:00

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