Contrasting drivers of OH and ozone changes in 2020 across the hemispheres (IMAGE)
Caption
Contrasting OH-O3 responses to reduced human emissions and enhanced natural fire emissions. a, Chemical responses to perturbations by the Australian wildfire in January (left) and COVID-19 lockdowns in May (right). Model responses are computed as the difference between the baseline and sensitivity simulation (see Methods). Observed tropospheric ozone responses are computed by subtracting the monthly average of 2019 from that of 2020. b, Schematic presentation of a simplified chemical mechanism governing ozone and OH responses to emission perturbations by Australian fires and COVID-19 lockdowns. Arrows represent main perturbations to precursor emissions by the two events and +/- signs represent chemical responses. Red symbols are for Australian fire and green for COVID-19 lockdowns.
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