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EOF Arctic Oscillation for beginner [message #90535]

Fri, 06 March 2015 14:03

siumtesfai
Messages: 62
Registered: April 2013

Member

Hello All,

I have difficulty in reproducing AO regression map
( http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao _index/ao.loading.shtml)

I am working with the code (http://www.idlcoyote.com/code_tips/eof_analysis.html)

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

dims = Size(air_temp, /Dimensions)
nlon = dims[0] & nlat = dims[1] & ntime = dims[2]
lon = Reform(lon_ncep[*,0]) & dlon = Abs(lon[1]-lon[0])
lat = Reform(lat_ncep[0,*]) & dlat = Abs(lat[1]-lat[0])
weights = Sqrt(Cos((lat_ncep - dlat/2.) * !DtoR))
FOR j=0,ntime-1 DO air_temp[*,*,j] = air_temp[*,*,j] * weights

any suggestion

Best regards

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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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