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A modelling study of OH, NO3 and H2SO4 in 2007- 2018 at SMEAR II, Finland : Analysis of long-term trends

Chen, Dean ; Xavier, Carlton ; Clusius, Petri ; Nieminen, Tuomo ; Roldin, Pontus LU ; Qi, Ximeng ; Pichelstorfer, Lukas ; Kulmala, Markku ; Rantala, Pekka and Aalto, Juho , et al. (2021) In Environmental Science: Atmospheres 1(6). p.449-472
Abstract

Major atmospheric oxidants (OH,O3 and NO3) dominate the atmospheric oxidation capacity, while H2SO4 is considered as a main driver for new particle formation. Although numerous studies have investigated the long-term trend of ozone in Europe, the trends of OH, NO3 and H2SO4 at specific sites are to a large extent unknown. The one-dimensional model SOSAA has been applied in several studies at the SMEAR II station and has been validated by measurements in several projects. Here, we applied the SOSAA model for the years 2007-2018 to simulate the atmospheric chemical components, especially the atmospheric oxidants OH and NO3, as well as H2SO4 at SMEAR II. The simulations were evaluated with observations from several shorter and longer... (More)

Major atmospheric oxidants (OH,O3 and NO3) dominate the atmospheric oxidation capacity, while H2SO4 is considered as a main driver for new particle formation. Although numerous studies have investigated the long-term trend of ozone in Europe, the trends of OH, NO3 and H2SO4 at specific sites are to a large extent unknown. The one-dimensional model SOSAA has been applied in several studies at the SMEAR II station and has been validated by measurements in several projects. Here, we applied the SOSAA model for the years 2007-2018 to simulate the atmospheric chemical components, especially the atmospheric oxidants OH and NO3, as well as H2SO4 at SMEAR II. The simulations were evaluated with observations from several shorter and longer campaigns at SMEAR II. Our results show that daily OH increased by 2.39% per year and NO3 decreased by 3.41% per year, with different trends of these oxidants during day and night. On the contrary, daytime sulfuric acid concentrations decreased by 2.78% per year, which correlated with the observed decreasing concentration of newly formed particles in the size range of 3- 25 nm with 1.4% per year at SMEAR II during the years 1997-2012. Additionally, we compared our simulated OH, NO3 and H2SO4 concentrations with proxies, which are commonly applied in case a limited number of parameters are measured and no detailed model simulations are available.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science: Atmospheres
volume
1
issue
6
pages
24 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85131757406
  • pmid:34604756
ISSN
2634-3606
DOI
10.1039/d1ea00020a
project
Continental Biosphere Aerosol Cloud climate feedback loop during the Anthropocene
Modelling atmospheric new particle formation from first principles – The role of Highly Oxygenated organic Molecules in clean and polluted air
language
English
LU publication?
yes
id
c58ca990-b76a-437d-8d8b-eede03f5dc60
date added to LUP
2022-10-10 09:47:07
date last changed
2024-06-13 13:05:24
@article{c58ca990-b76a-437d-8d8b-eede03f5dc60,
  abstract     = {{<p>Major atmospheric oxidants (OH,O3 and NO3) dominate the atmospheric oxidation capacity, while H2SO4 is considered as a main driver for new particle formation. Although numerous studies have investigated the long-term trend of ozone in Europe, the trends of OH, NO3 and H2SO4 at specific sites are to a large extent unknown. The one-dimensional model SOSAA has been applied in several studies at the SMEAR II station and has been validated by measurements in several projects. Here, we applied the SOSAA model for the years 2007-2018 to simulate the atmospheric chemical components, especially the atmospheric oxidants OH and NO3, as well as H2SO4 at SMEAR II. The simulations were evaluated with observations from several shorter and longer campaigns at SMEAR II. Our results show that daily OH increased by 2.39% per year and NO3 decreased by 3.41% per year, with different trends of these oxidants during day and night. On the contrary, daytime sulfuric acid concentrations decreased by 2.78% per year, which correlated with the observed decreasing concentration of newly formed particles in the size range of 3- 25 nm with 1.4% per year at SMEAR II during the years 1997-2012. Additionally, we compared our simulated OH, NO3 and H2SO4 concentrations with proxies, which are commonly applied in case a limited number of parameters are measured and no detailed model simulations are available. </p>}},
  author       = {{Chen, Dean and Xavier, Carlton and Clusius, Petri and Nieminen, Tuomo and Roldin, Pontus and Qi, Ximeng and Pichelstorfer, Lukas and Kulmala, Markku and Rantala, Pekka and Aalto, Juho and Sarnela, Nina and Kolari, Pasi and Keronen, Petri and Rissanen, Matti P. and Taipale, Ditte and Foreback, Benjamin and Baykara, Metin and Zhou, Putian and Boy, Michael}},
  issn         = {{2634-3606}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{449--472}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Environmental Science: Atmospheres}},
  title        = {{A modelling study of OH, NO3 and H2SO4 in 2007- 2018 at SMEAR II, Finland : Analysis of long-term trends}},
  url          = {{http://dx.doi.org/10.1039/d1ea00020a}},
  doi          = {{10.1039/d1ea00020a}},
  volume       = {{1}},
  year         = {{2021}},
}