R help - Jul 2017 - filtering of CO2 observation time series residuals using FFT

Hi,

I have CO2 observations time series, I can calculate residuals by removing
seasonal cycle and trend. But how to filter residuals using Fast Fourier
Transform (FFT) which transforms the data into the frequency domain. And
then apply a low pass filter function to the frequency data, then transform
the filtered data to the real domain using an inverse FFT.

Can anyone working on carbon cycle research, have R script which can do
above analysis.
You can take example of Mauna Loa CO2 time series and do filtering.

Great Thanks,

Best Regards,
Yogesh

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