Figure 3: Aerosol neutralization state at Alert.

Monthly median (April to October) aerosol neutralization ratios from filter measurements (black) at Alert, Nunavut, Canada and for the GEOS-Chem-TOMAS (GCT) simulations with (blue) and without (red) seabird-colony NH₃ emissions. Error bars show the 20th and 80th percentiles.