Hydrogen peroxide, methyl hydroperoxide, and formaldehdye over North America and the North Atlantic

The impact of convection on H₂O₂, CH₃OOH, and CH₂O is also discussed. Using the ratio H₂O₂/CH₃OOH, convectively influenced air parcels were found to be enhanced in CH₃OOH, CH₂O, CO, NO, and NO₂ while H₂O₂ and HNO3 were depleted by wet removal. Biomass burning was also shown to increase H₂O₂, CH₃OOH, and CH₂O mixing ratios up to 1.5, 2, and 1 ppbv, respectively, even after 4-5 days of transit.

Results from this study show considerable variability in H₂O₂, CH₃OOH, and CH₂O throughout the North American and North Atlantic troposphere. The variability in the upper troposphere is driven by local photochemical production and transport via regional convection and long-range pathways, suggesting transport mechanisms are important factors to include in photochemical models simulating H₂O₂, CH₃OOH, CH₂O, and HOx.