Instability and atmospheric CO2 anomalies in the recent global carbon cycle

Roger James Francey, Jorgen Segerlund Frederiksen

A major instability occurred in the recent global carbon cycle. It manifests as a major CO2 anomaly between 2009 and 2015 that is clearly seen in the residuals from generalized exponential growth, or equivalent quadratic curves through Taylor expansion, or 10-year running means. Our findings contradict recent assertions of the stability of the recent global carbon cycle based on growth rate analysis. Our analysis highlights the methodological problems of attempting to determine systematic anomalies in the carbon cycle based on annual tendency growth rates where the anomaly is hidden in plain sight.