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

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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.
Originalspråkengelska
TidskriftAtmospheric Chemistry and Physics
Volym18
Utgåva23
Sidor (från-till)17437-17450
Antal sidor14
ISSN1680-7316
DOI
StatusPublicerad - 10 dec 2018
MoE-publikationstypA1 Tidskriftsartikel-refererad

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  • 1172 Miljövetenskap
  • 114 Fysik

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@article{a300c44730a64a00bc5cf8edb58a385b,
title = "Vertical characterization of highly oxygenated molecules (HOMs) below and above a boreal forest canopy",
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.",
keywords = "OXIDIZED MULTIFUNCTIONAL COMPOUNDS, PARTICLE FORMATION, ORGANIC-MOLECULES, BOUNDARY-LAYER, SULFURIC-ACID, AMBIENT IONS, PTR-MS, OZONOLYSIS, NUCLEATION, PRODUCTS, 1172 Environmental sciences, 114 Physical sciences",
author = "Qiaozhi Zha and Chao Yan and Heikki Junninen and Matthieu Riva and Nina Sarnela and Juho Aalto and Lauriane Quelever and Simon Schallhart and Lubna Dada and Liine Heikkinen and Otso Per{\"a}kyl{\"a} and Jun Zou and Cl{\'e}mence Rose and Yonghong Wang and Ivan Mammarella and Gabriel Katul and Timo Vesala and Worsnop, {Douglas R.} and Markku Kulmala and Tuukka Pet{\"a}j{\"a} and Federico Bianchi and Mikael Ehn",
year = "2018",
month = "12",
day = "10",
doi = "10.5194/acp-18-17437-2018",
language = "English",
volume = "18",
pages = "17437--17450",
journal = "Atmospheric Chemistry and Physics",
issn = "1680-7316",
publisher = "COPERNICUS GESELLSCHAFT MBH",
number = "23",

}

TY - JOUR

T1 - Vertical characterization of highly oxygenated molecules (HOMs) below and above a boreal forest canopy

AU - Zha, Qiaozhi

AU - Yan, Chao

AU - Junninen, Heikki

AU - Riva, Matthieu

AU - Sarnela, Nina

AU - Aalto, Juho

AU - Quelever, Lauriane

AU - Schallhart, Simon

AU - Dada, Lubna

AU - Heikkinen, Liine

AU - Peräkylä, Otso

AU - Zou, Jun

AU - Rose, Clémence

AU - Wang, Yonghong

AU - Mammarella, Ivan

AU - Katul, Gabriel

AU - Vesala, Timo

AU - Worsnop, Douglas R.

AU - Kulmala, Markku

AU - Petäjä, Tuukka

AU - Bianchi, Federico

AU - Ehn, Mikael

PY - 2018/12/10

Y1 - 2018/12/10

N2 - 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.

AB - 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.

KW - OXIDIZED MULTIFUNCTIONAL COMPOUNDS

KW - PARTICLE FORMATION

KW - ORGANIC-MOLECULES

KW - BOUNDARY-LAYER

KW - SULFURIC-ACID

KW - AMBIENT IONS

KW - PTR-MS

KW - OZONOLYSIS

KW - NUCLEATION

KW - PRODUCTS

KW - 1172 Environmental sciences

KW - 114 Physical sciences

U2 - 10.5194/acp-18-17437-2018

DO - 10.5194/acp-18-17437-2018

M3 - Article

VL - 18

SP - 17437

EP - 17450

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 23

ER -