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- Title
Vertical characterization of Highly Oxygenated Molecules (HOMs) below and above a boreal forest canopy.
- Authors
Qiaozhi Zha; Chao Yan; Junninen, Heikki; Riva, Matthieu; Aalto, Juho; Quéléver, Lauriane; Schallhart, Simon; Dada, Lubna; Heikkinen, Liine; Peräkylä, Otso; Jun Zou; Rose, Clémence; Yonghong Wang; Mammarella, Ivan; Katul, Gabriel; Vesala, Timo; Worsnop, Douglas R.; Kulmala, Markku; Petäjä, Tuukka; Bianchi, Federico
- 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, profile measurements of neutral HOM molecules below and above the forest canopy were performed for the first time in the boreal forest SMEAR II station during September 2016. The HOM concentrations and composition distributions below and above the canopy were similar, supporting a well-mixed boundary layer approximation during daytime. However, much lower HOM concentration were frequently observed at ground level due to the formation of a shallow decoupled layer below the canopy attached to the forest floor. Near 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 also illustrate that near-ground HOM measurements conducted in strong stably stratified conditions might only be representative of a small fraction of the entire nocturnal boundary layer. This might, in turn, influence the growth of newly formed particles and SOA formation below the canopy where a large majority of measurements are typically conducted.
- Subjects
TAIGA ecology; ATMOSPHERIC aerosols; WEATHER; REACTIVE nitrogen species; OXIDIZING agents
- Publication
Atmospheric Chemistry & Physics Discussions, 2017, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2017-1098