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Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity

MPS-Authors
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Nölscher,  A.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons192241

Yanez-Serrano,  A M
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons187722

Wolff,  S.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101057

Kesselmeier,  J.
Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101364

Williams,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Nölscher, A., Yanez-Serrano, A. M., Wolff, S., de Araujo, A. C., Lavric, J. V., Kesselmeier, J., et al. (2016). Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity. Nature Communications, 7: 10383. doi:10.1038/ncomms10383.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-89C6-4
Abstract
The hydroxyl radical (OH) removes most atmospheric pollutants from air. The loss frequency of OH radicals due to the combined effect of all gas-phase OH reactive species is a measureable quantity termed total OH reactivity. Here we present total OH reactivity observations in pristine Amazon rainforest air, as a function of season, time-of-day and height (0-80 m). Total OH reactivity is low during wet (10 s(-1)) and high during dry season (62 s(-1)). Comparison to individually measured trace gases reveals strong variation in unaccounted for OH reactivity, from 5 to 15% missing in wet-season afternoons to mostly unknown (average 79%) during dry season. During dry-season afternoons isoprene, considered the dominant reagent with OH in rainforests, only accounts for similar to 20% of the total OH reactivity. Vertical profiles of OH reactivity are shaped by biogenic emissions, photochemistry and turbulent mixing. The rainforest floor was identified as a significant but poorly characterized source of OH reactivity.