Trend Analysis

Trend Analysis
The online trend analysis tool uses Fast Fourier Transform and Thoning’s filter [Thoning et al., 1989, J. Geophys. Res., 94(6):8549-8565] to remove the short-term variations from a time series observation and obtain a long-term variation and trend. The tool is designed particularly for extracting the trend and increase rate of a daily mean atmospheric pCO2 data. Users can paste their data into the data box of the interface, set the cut-off frequency, and then get the filtered results and coefficients.
  • [Software] Web application by Dr. Jiye Zeng
  • [Parameters of Calculation] Long-term variation and trend of time series data.