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. Author manuscript; available in PMC: 2020 Dec 2.
Published in final edited form as: J Geophys Res Atmos. 2019 Nov 7;124(22):12301–12318. doi: 10.1029/2019JD031159

Figure 9.

Figure 9.

Twin Otter flight path colored by (A) the fraction of organic at m/z 44 (f44) and (B) the fraction of organic at m/z 60 (f60) for NiCE Research Flight 17 on 30 July 2013. Shown are samples containing smoke from the cluster of fires in southern Oregon (blue square). Greater f44 is an indication of oxidized organic aerosol (largely associated with organic acids, Ng et al., 2011), whereas greater f60 indicates a higher fraction of levoglucosan, a marker for fresh BB emissions (Alfarra et al., 2007).