Re: Calculating Arctic Oscillation Index

EOF Example 1 and modified to create Example 4 at:

http://www.ncl.ucar.edu/Applications/eof.shtml

On 5/4/12 2:41 PM, Jinwoong Yoo wrote:
> Dear Dennis,
>
> I know the eof code.
> But I don't know how to get the actual AO index value as in their
> explanation:
>
> "Daily and monthly AO (AAO) indices are constructed *by projecting the
> daily and monthly mean 1000-hPa (700-hPa) height anomalies onto the
> leading EOF mode*. Both time series are normalized by the standard
> deviation of the /monthly/ index (1979-2000 base period). Since the
> loading pattern of AO
> <http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/loading.html> (AAO
> <http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/aao/aao.loading.shtml>)
> is obtained using the monthly mean height anomaly dataset, the index
> corresponding to each loading pattern becomes /one/ when it is
> normalized by the standard deviation of the /monthly/ index."
>
> Thank you.
>
> Best,
>
>
> Jinwoong Yoo
>
>
>
> On Fri, May 4, 2012 at 4:27 PM, Dennis Shea <shea@ucar.edu
> <mailto:shea@ucar.edu>> wrote:
>
> A process similar to what NOAA CPC uses is outlined t:
>
> http://www.ncl.ucar.edu/__Applications/eof.shtml
> <http://www.ncl.ucar.edu/Applications/eof.shtml>
> Example 3
>
>
>
>
> On 5/4/12 2:24 PM, Jinwoong Yoo wrote:
>
> Dear NCL users,
>
> I'd like to calculate Arctic Oscillation Index using NCL as NOAA
> CPC does.
> (see Teleconnection Pattern Calculation Procedures at
> http://www.cpc.ncep.noaa.gov/__products/precip/CWlink/daily___ao_index/history/method.shtml
> <http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/history/method.shtml>)
>
> If you know the step by step or have any tip, please let me know.
> Thank you in advance.
>
> Regards,
>
> Jinwoong Yoo
>
>
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Received on Fri May 11 15:01:47 2012