IPO index calculation

Hi,
I am trying to calculate Interdecadal Pacific Oscillation Index using
HadSST2 data. I am following Parker et al., 2007 method to calculate the
IPO. Parker et al. use a filter called Chebyshev filter. I am not sure if
NCL has any built in function that does Chebyshev filtering. I could
calculate IPO index without the filter and but am particularly interested
in reproducing the monthly principal component values as in Parker et al.
2007. Does any one have a script already written to calculate IPO? Any help
will be appreciated.
Thanks,
Mahesh

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Received on Wed Apr 2 14:56:18 2014