Figure 3.

Time series of 1 h average observations from the San Clemente Island (SCI; a, b), Victorville (VIC; c, d), and La Jolla (LJO; e, f) sites between January 2014 and June 2016. Hourly average observations of CO₂ (a, c, e) and CH₄ (b, d, f) were filtered using stability criteria, as described in the text. The CCGCRV curve-fitting algorithm was then used to fit the selected data in an iterative approach by removing CO₂ and CH₄ outliers > ±2σ (see Supplement for further information on the fitting parameters). The final filtered data set (red points) and smooth curve fits (cyan lines) are also shown. Note: values outside of the range plotted are not shown.