Title:	Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity.
Authors:	NÖLSCHER, A. C. YAÑEZ-SERRANO, A. M. WOLFF, S. ARAUJO, A. C. de LAVRIC, J. V. KESSELMEIER, J. WILLIAMS, J.
Affiliation:	A. C. Nölscher, Max Planck Institute for Chemistry; A. M. Yañez-Serrano, Max Planck Institute for Chemistry / INPA; S. Wolff, Max Planck Institute for Chemistry / INPA; ALESSANDRO CARIOCA DE ARAUJO, CPATU; J. V. Lavric, Max Planck Institute for Biogeochemistry; J. Kesselmeier, Max Planck Institute for Chemistry; J. Williams, Max Planck Institute for Chemistry.
Date Issued:	2016
Citation:	Nature Communications, v. 7, art. n. 10383, 22 Jan. 2016.
Description:	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 s1) and high during dry season (62 s1). 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 B20% 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.
Thesagro:	Floresta
NAL Thesaurus:	Amazonia
Keywords:	Sazonalidade
DOI:	10.1038/ncomms10383
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATU)