Extended Data Fig. 6: Contributions of NOx from the boundary layer, free troposphere and whole troposphere to global [OH]trop-M and CH4 sink changes during unusual years.
From: Air pollution modulates trends and variability of the global methane budget
The unusual years include the El Niño event starting in 2015 (mean values of May 2015 to April 2016 minus May 2014 to April 2015) and the COVID-19 lockdown in 2020 (2020 minus 2019). a, [OH]trop-M. b, Chemical loss of CH4. Box plots and error bars indicate the means and ranges of individual calculations, each represented by grey circles (n = 3).
