Unexpected seasonality in quantity and composition of Amazon 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 (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 ∼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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Nölscher AC,Yañez-Serrano AM,Wolff S,de Araujo AC,Lavrič JV,Kesselmeier J,Williams J

doi

10.1038/ncomms10383

subject

Has Abstract

pub_date

2016-01-22 00:00:00

pages

10383

issn

2041-1723

pii

ncomms10383

journal_volume

7

pub_type

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