Factors controlling atmospheric DMS and its oxidation products (MSA and nssSO<SUB>4</SUB><SUP>2-</SUP>) in the aerosol at Terra Nova Bay, Antarctica - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Atmospheric Chemistry and Physics Year : 2022

Factors controlling atmospheric DMS and its oxidation products (MSA and nssSO42-) in the aerosol at Terra Nova Bay, Antarctica

Silvia Becagli
  • Function : Author
Elena Barbaro
  • Function : Author
Simone Bonamano
  • Function : Author
Laura Caiazzo
  • Function : Author
Alcide Di Sarra
  • Function : Author
Matteo Feltracco
  • Function : Author
Paolo Grigioni
  • Function : Author
Jost Heintzenberg
  • Function : Author
Luigi Lazzara
  • Function : Author
Alice Madonia
  • Function : Author
Marco Marcelli
  • Function : Author
Chiara Melillo
  • Function : Author
Daniela Meloni
  • Function : Author
Caterina Nuccio
  • Function : Author
Giandomenico Pace
  • Function : Author
Ki-Tae Park
  • Function : Author
Mirko Severi
  • Function : Author
Marco Vecchiato
  • Function : Author
Roberta Zangrando
  • Function : Author
Rita Traversi
  • Function : Author

Abstract

This paper presents the results of simultaneous high time-resolution measurements of biogenic aerosol (methane sulfonic acid (MSA), non-sea salt sulfate nssSO42-) with its gaseous precursor dimethylsulfide (DMS), performed at the Italian coastal base Mario Zucchelli Station (MZS) in Terra Nova Bay (MZS) during two summer campaigns (2018-2019 and 2019-2020). Data on atmospheric DMS concentration are scarce, especially in Antarctica. The DMS maximum at MZS occurs in December, one month earlier than at other Antarctic stations. The maximum of DMS concentration is connected with the phytoplanktonic senescent phase following the bloom of Phaeocystis antarctica that occurs in the polynya when sea ice opens up. The second plankton bloom occurs in January and, despite the high dimethylsufoniopropionate (DMSP) concentration in seawater, atmospheric DMS remains low, probably due to its fast biological turnover in seawater in this period. The intensity and timing of the DMS evolution during the two years suggest that only the portion of the polynya close to the sampling site produces a discernible effect on the measured DMS. The closeness to the DMS source area and the occurrence of air masses containing DMS and freshly formed oxidation products allow us to study the kinetic of biogenic aerosol formation and the reliable derivation of the branch ratio between MSA and nssSO42- from DMS oxidation that is estimated to be 0.84±0.06. Conversely, for aged air masses with low DMS content, an enrichment of nssSO42- with respect to MSA, is observed. We estimate that the mean contribution of freshly formed biogenic aerosol to PM10 is 17 % with a maximum of 56 %. The high contribution of biogenic aerosol to the total PM10 mass in summer in this area highlights the dominant role of the polynya on biogenic aerosol formation. Finally, due to the regional and year-to-year variability of DMS and related biogenic aerosol formation, we stress the need for long-term measurements of seawater and atmospheric DMS and biogenic aerosol along the Antarctic coast and in the Southern Ocean.
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insu-03839375 , version 1 (04-11-2022)

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Silvia Becagli, Elena Barbaro, Simone Bonamano, Laura Caiazzo, Alcide Di Sarra, et al.. Factors controlling atmospheric DMS and its oxidation products (MSA and nssSO42-) in the aerosol at Terra Nova Bay, Antarctica. Atmospheric Chemistry and Physics, 2022, 22, pp.9245-9263. ⟨10.5194/acp-22-9245-2022⟩. ⟨insu-03839375⟩
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