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|Title:||Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity|
|Authors:||Nölscher, Anke C.|
Yáñez-Serrano, Ana Maria
Araüjo, Alessandro Carioca de
Lavric, J. V.
Williams, Jonathan C.
Rainforest Air Reactivity
|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.|
|Appears in Collections:||Artigos|
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