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Title: Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity
Authors: Nölscher, Anke C.
Yáñez-Serrano, Ana Maria
Wolff, Stefan
Araüjo, Alessandro Carioca de
Lavric, J. V.
Kesselmeier, Jürgen
Williams, Jonathan C.
Keywords: Isoprene
Air Quality
Atmospheric Pollution
Concentration (composition)
Hydroxyl Radical
Pollutant Removal
Pristine Environment
Quantitative Analysis
Reaction Kinetics
Trace Gas
Turbulent Mixing
Dry Season
Environmental Parameters
Environmental Temperature
Rainforest Air Reactivity
Seasonal Variation
Wet Season
Issue Date: 2016
metadata.dc.publisher.journal: Nature Communications
metadata.dc.relation.ispartof: Volume 7
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 (10s-1) and high during dry season (62s-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 ∼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.
metadata.dc.identifier.doi: 10.1038/ncomms10383
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