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  • Hao, LiqingUniversity of Eastern Finland (author)

Combined effects of boundary layer dynamics and atmospheric chemistry on aerosol composition during new particle formation periods

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-12-13
  • Copernicus GmbH,2018
  • 12 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:7102c7be-902d-4622-9d2b-b05635d6cc6e
  • https://lup.lub.lu.se/record/7102c7be-902d-4622-9d2b-b05635d6cc6eURI
  • https://doi.org/10.5194/acp-18-17705-2018DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Characterizing aerosol chemical composition in response to meteorological changes and atmospheric chemistry is important to gain insights into new particle formation mechanisms. A BAECC (Biogenic Aerosols - Effects on Clouds and Climate) campaign was conducted during the spring 2014 at the SMEAR II station (Station for Measuring Forest Ecosystem-Aerosol Relations) in Finland. The particles were characterized by a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS). A PBL (planetary boundary layer) dilution model was developed to assist interpreting the measurement results. Right before nucleation events, the mass concentrations of organic and sulfate aerosol species were both decreased rapidly along with the growth of PBL heights. However, the mass fraction of sulfate aerosol of the total aerosol mass was increased, in contrast to a decrease for the organic mass fraction. Meanwhile, an increase in LVOOA (low-volatility oxygenated organic aerosol) mass fraction of the total organic mass was observed, in distinct comparison to a reduction of SVOOA (semi-volatile OOA) mass fraction. Our results demonstrate that, at the beginning of nucleation events, the observed sulfate aerosol mass was mainly driven by vertical turbulent mixing of sulfate-rich aerosols between the residual layer and the newly formed boundary layer, while the condensation of sulfuric acid (SA) played a minor role in interpreting the measured sulfate mass concentration. For the measured organic aerosols, their temporal profiles were mainly driven by dilution from PBL development, organic aerosol mixing in different boundary layers and/or partitioning of organic vapors, but accurate measurements of organic vapor concentrations and characterization on the spatial aerosol chemical composition are required. In general, the observed aerosol particles by AMS are subjected to joint effects of PBL dilution, atmospheric chemistry and aerosol mixing in different boundary layers. During aerosol growth periods in the nighttime, the mass concentrations of organic aerosols and organic nitrate aerosols were both increased. The increase in SVOOA mass correlated well with the calculated increase in condensed HOMs' (highly oxygenated organic molecules) mass. To our knowledge, our results are the first atmospheric observations showing a connection between increase in SVOOA and condensed HOMs during the nighttime.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Garmash, OlgaUniversity of Helsinki (author)
  • Ehn, MikaelUniversity of Helsinki (author)
  • Miettinen, PasiUniversity of Eastern Finland (author)
  • Massoli, PaolaAerodyne Research, Inc. (author)
  • Mikkonen, SanttuUniversity of Eastern Finland (author)
  • Jokinen, TuijaUniversity of Helsinki (author)
  • Roldin, PontusLund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Environmental and Climate Science (CEC),Faculty of Science,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-pur (author)
  • Aalto, PasiUniversity of Helsinki (author)
  • Yli-Juuti, TainaUniversity of Eastern Finland (author)
  • Joutsensaari, JormaUniversity of Eastern Finland (author)
  • Petäjä, TuukkaUniversity of Helsinki (author)
  • Kulmala, MarkkuUniversity of Helsinki (author)
  • Lehtinen, Kari E.J.Finnish Meteorological Institute,University of Eastern Finland (author)
  • Worsnop, Douglas R.Aerodyne Research, Inc.,University of Helsinki,University of Eastern Finland (author)
  • Virtanen, AnneleUniversity of Eastern Finland (author)
  • University of Eastern FinlandUniversity of Helsinki (creator_code:org_t)

Related titles

  • In:Atmospheric Chemistry and Physics: Copernicus GmbH18:23, s. 17705-177161680-73161680-7324

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