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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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The distribution of monthly mean nucleation frequency possessed a characteristic pattern. Its shape was compared to those of environmental variables including vegetation-derived properties. The spring maximum in the occurrence frequency often overlapped with the positive T anomaly. The link between the heat stress and the occurrence minimum in summer could not be proved, while association between the occurrence frequency and vegetation growth dynamics was clearly identified in spring.
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https://doi.org/10.5194/acp-2020-862
https://doi.org/10.5194/acp-2020-862

  30 Nov 2020

30 Nov 2020

Review status: this preprint is currently under review for the journal ACP.

Influence of vegetation on occurrence and time distributions of regional new aerosol particle formation and growth

Imre Salma1,2, Wanda Thén1,3, Pasi Aalto4, Veli-Matti Kerminen4, Anikó Kern5, Zoltán Barcza2,6,7, Tuukka Petäjä4, and Markku Kulmala4 Imre Salma et al.
  • 1Institute of Chemistry, Eötvös University, Budapest, Hungary
  • 2Excellence Center, Faculty of Science, Eötvös University, Martonvásár, Hungary
  • 3Hevesy György Ph. D. School of Chemistry, Eötvös University, Budapest, Hungary
  • 4Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland
  • 5Department of Geophysics and Space Science, Eötvös University, Budapest, Hungary
  • 6Department of Meteorology, Eötvös University, Budapest, Hungary
  • 7Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic

Abstract. Occurrence frequency (fNPF) of regional atmospheric new aerosol particle formation (NPF) and consecutive growth events were studied with respect to vegetation activity, aerosol properties, air pollutants and meteorological data in Budapest over the time interval of 2008–2018. The data set evaluated contained results of in situ measurements on land surface mostly performed at the Budapest platform for Aerosol Research and Training Laboratory, of satellite-based products recorded by MODIS on Terra and of modelled vegetation emission-related properties from an advanced regional biogeochemical model. Annual mean relative occurrence frequencies were considerable (with an overall mean of 21 %), remained at a constant level (with an overall SD of 5 %) and did not exhibit tendentious change over the years. The shape of the distributions of monthly mean fNPF exhibited large variability from year to year, while the overall distribution already possessed a characteristic pattern. This structure of the NPF occurrence distributions was compared to those of environmental variables including concentrations of gas-phase H2SO4, SO2, O3, NO, NO2, CO, PM10 mass and NH3, of particle numbers in the size fractions of 6–1000, 6–100 and 100–1000 nm, condensation sink, air temperature (T), relative humidity, wind speed (WS), atmospheric pressure, global solar radiation, gross primary production of vegetation, leaf area index and stomatal conductance. There were no evident systematic similarities between fNPF on one hand and all variables on the other hand, except for H2SO4 and perhaps NH3. The spring maximum in the NPF occurrence frequency distribution often overlapped with the time intervals of positive T anomaly on vegetated territories. The link between the potential heat stress exerted on plants in sultry summer intervals and the summer fNPF minimum could not be proved. The relevance of environmental variables was assessed by their ratios on NPF event day and on non-event days. Gas-phase H2SO4 concentration showed the largest monthly ratios, followed by O3. The WS, biogenic precursor gases and SO2 can generally favour NPF events although their influence seemed to be constrained. Association between the fNPF and vegetation growth dynamics was clearly identified.

Imre Salma et al.

 
Status: open (until 25 Jan 2021)
Status: open (until 25 Jan 2021)
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Imre Salma et al.

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Latest update: 20 Jan 2021
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Short summary
The distribution of monthly mean nucleation frequency possessed a characteristic pattern. Its shape was compared to those of environmental variables including vegetation-derived properties. The spring maximum in the occurrence frequency often overlapped with the positive T anomaly. The link between the heat stress and the occurrence minimum in summer could not be proved, while association between the occurrence frequency and vegetation growth dynamics was clearly identified in spring.
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