Response to reviewer comments

Author response: Simulations with and without lightning and with biomass burning on and off have previously been performed and discussed in Fischer et al. [2014], albeit for a different year (2008) than the years discussed here (2005 and 2006). Fischer et al. [2014] includes a figure that shows the sensitivity of PAN to different emission types, illustrating strong sensitivity to both lightning and biomass burning in the tropics for October and January.We have repeated these simulations for 2005 and 2006 and difference plots for PAN are now included in the Supplemental Information.

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