Yogesh Tiwari

2017-Jul-10 13:24 UTC

### [R] 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 [[alternative HTML version deleted]]