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Vertical distribution of sources and sinks of volatile organic compounds within a boreal forest canopy

Petersen, Ross LU ; Holst, Thomas LU ; Mölder, Meelis LU ; Kljun, Natascha LU orcid and Rinne, Janne LU (2023) In Atmospheric Chemistry and Physics 23(13). p.7839-7858
Abstract

The ecosystem-atmosphere flux of biogenic volatile organic compounds (BVOCs) has important impacts on tropospheric oxidative capacity and the formation of secondary organic aerosols, influencing air quality and climate. Here we present within-canopy measurements of a set of dominant BVOCs in a managed spruce- and pine-dominated boreal forest located at the ICOS (Integrated Carbon Observation System) station Norunda in Sweden, collected using proton-transfer-reaction mass spectrometry (PTR-MS) during 2014-2016 and vertical emission profiles derived from these data. Ozone concentrations were simultaneously measured in conjunction with these PTR-MS measurements. The main BVOCs investigated with the PTR-MS were isoprene, monoterpenes,... (More)

The ecosystem-atmosphere flux of biogenic volatile organic compounds (BVOCs) has important impacts on tropospheric oxidative capacity and the formation of secondary organic aerosols, influencing air quality and climate. Here we present within-canopy measurements of a set of dominant BVOCs in a managed spruce- and pine-dominated boreal forest located at the ICOS (Integrated Carbon Observation System) station Norunda in Sweden, collected using proton-transfer-reaction mass spectrometry (PTR-MS) during 2014-2016 and vertical emission profiles derived from these data. Ozone concentrations were simultaneously measured in conjunction with these PTR-MS measurements. The main BVOCs investigated with the PTR-MS were isoprene, monoterpenes, methanol, acetaldehyde, and acetone. The distribution of BVOC sources and sinks in the forest canopy was explored using Lagrangian dispersion matrix methods, in particular continuous near-field theory. The forest canopy was found to contribute ca. 86% to the total monoterpene emission in summertime, whereas the below-canopy and canopy emissions were comparable (ca. 42% and 58%, respectively) during the fall period. This result indicates that boreal forest litter and other below-canopy emitters are a principal source of total forest monoterpene emissions during the fall months. During night, our results for methanol, acetone, and acetaldehyde seasonally present strong sinks in the forest canopy, especially in the fall, likely due to the nighttime formation of dew on vegetation surfaces.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
23
issue
13
pages
20 pages
publisher
Copernicus GmbH
external identifiers
  • scopus:85169669526
  • scopus:85169669526
ISSN
1680-7324
DOI
10.5194/acp-23-7839-2023
project
Sesquiterpene emissions from boreal forest, and their interactions with climate and tropospheric chemistry
FORMAS: Towards full understanding of managed boreal forests as part of climate system: Role of biogenic volatile organic compounds
language
English
LU publication?
yes
id
6adff26d-0b6a-4d31-8b92-cd24eb22b049
date added to LUP
2023-07-31 14:07:07
date last changed
2023-09-12 11:22:08
@article{6adff26d-0b6a-4d31-8b92-cd24eb22b049,
  abstract     = {{<p>The ecosystem-atmosphere flux of biogenic volatile organic compounds (BVOCs) has important impacts on tropospheric oxidative capacity and the formation of secondary organic aerosols, influencing air quality and climate. Here we present within-canopy measurements of a set of dominant BVOCs in a managed spruce- and pine-dominated boreal forest located at the ICOS (Integrated Carbon Observation System) station Norunda in Sweden, collected using proton-transfer-reaction mass spectrometry (PTR-MS) during 2014-2016 and vertical emission profiles derived from these data. Ozone concentrations were simultaneously measured in conjunction with these PTR-MS measurements. The main BVOCs investigated with the PTR-MS were isoprene, monoterpenes, methanol, acetaldehyde, and acetone. The distribution of BVOC sources and sinks in the forest canopy was explored using Lagrangian dispersion matrix methods, in particular continuous near-field theory. The forest canopy was found to contribute ca. 86% to the total monoterpene emission in summertime, whereas the below-canopy and canopy emissions were comparable (ca. 42% and 58%, respectively) during the fall period. This result indicates that boreal forest litter and other below-canopy emitters are a principal source of total forest monoterpene emissions during the fall months. During night, our results for methanol, acetone, and acetaldehyde seasonally present strong sinks in the forest canopy, especially in the fall, likely due to the nighttime formation of dew on vegetation surfaces.</p>}},
  author       = {{Petersen, Ross and Holst, Thomas and Mölder, Meelis and Kljun, Natascha and Rinne, Janne}},
  issn         = {{1680-7324}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{13}},
  pages        = {{7839--7858}},
  publisher    = {{Copernicus GmbH}},
  series       = {{Atmospheric Chemistry and Physics}},
  title        = {{Vertical distribution of sources and sinks of volatile organic compounds within a boreal forest canopy}},
  url          = {{http://dx.doi.org/10.5194/acp-23-7839-2023}},
  doi          = {{10.5194/acp-23-7839-2023}},
  volume       = {{23}},
  year         = {{2023}},
}