Vertical characterization of highly oxygenated molecules (HOMs) below and above a boreal forest canopy

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Zha , Q , Yan , C , Junninen , H , Riva , M , Sarnela , N , Aalto , J , Quelever , L , Schallhart , S , Dada , L , Heikkinen , L , Peräkylä , O , Zou , J , Rose , C , Wang , Y , Mammarella , I , Katul , G , Vesala , T , Worsnop , D R , Kulmala , M , Petäjä , T , Bianchi , F & Ehn , M 2018 , ' Vertical characterization of highly oxygenated molecules (HOMs) below and above a boreal forest canopy ' , Atmospheric Chemistry and Physics , vol. 18 , no. 23 , pp. 17437-17450 .

Title: Vertical characterization of highly oxygenated molecules (HOMs) below and above a boreal forest canopy
Author: Zha, Qiaozhi; Yan, Chao; Junninen, Heikki; Riva, Matthieu; Sarnela, Nina; Aalto, Juho; Quelever, Lauriane; Schallhart, Simon; Dada, Lubna; Heikkinen, Liine; Peräkylä, Otso; Zou, Jun; Rose, Clémence; Wang, Yonghong; Mammarella, Ivan; Katul, Gabriel; Vesala, Timo; Worsnop, Douglas R.; Kulmala, Markku; Petäjä, Tuukka; Bianchi, Federico; Ehn, Mikael
Contributor organization: INAR Physics
Institute for Atmospheric and Earth System Research (INAR)
Polar and arctic atmospheric research (PANDA)
Date: 2018-12-10
Language: eng
Number of pages: 14
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
Abstract: While the role of highly oxygenated molecules (HOMs) in new particle formation (NPF) and secondary organic aerosol (SOA) formation is not in dispute, the interplay between HOM chemistry and atmospheric conditions continues to draw significant research attention. During the Influence of Biosphere-Atmosphere Interactions on the Reactive Nitrogen budget (IBAIRN) campaign in September 2016, profile measurements of neutral HOMs below and above the forest canopy were performed for the first time at the boreal forest SMEAR II station. The HOM concentrations and composition distributions below and above the canopy were similar during daytime, supporting a well-mixed boundary layer approximation. However, much lower nighttime HOM concentrations were frequently observed at ground level, which was likely due to the formation of a shallow decoupled layer below the canopy. Near the ground HOMs were influenced by the changes in the precursors and oxidants and enhancement of the loss on surfaces in this layer, while the HOMs above the canopy top were not significantly affected. Our findings clearly illustrate that near-ground HOM measurements conducted under stably stratified conditions at this site might only be representative of a small fraction of the entire nocturnal boundary layer. This could, in turn, influence the growth of newly formed particles and SOA formation below the canopy where the large majority of measurements are typically conducted.
1172 Environmental sciences
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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