Factors controlling atmospheric DMS and its oxidation products (MSA and nssSO 4 2− ) in the aerosol at Terra Nova Bay, Antarctica

• Published in: Atmospheric Chemistry and Physics
• Main Authors: S. Becagli, E. Barbaro, S. Bonamano, L. Caiazzo, A. di Sarra, M. Feltracco, P. Grigioni, J. Heintzenberg, L. Lazzara, M. Legrand, A. Madonia, M. Marcelli, C. Melillo, D. Meloni, C. Nuccio, G. Pace, K.-T. Park, S. Preunkert, M. Severi, M. Vecchiato, R. Zangrando, R. Traversi
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2022
• Subjects: Physics; QC1-999; Chemistry; QD1-999; Antarctic; Terra Nova Bay; Mario Zucchelli; Mario Zucchelli Station; Antarc*; Antarctica; Sea ice
• Online Access: https://doi.org/10.5194/acp-22-9245-2022; https://doaj.org/article/551718a648b4456db25541422c4914b9

This paper presents the results of simultaneous high time-resolution measurements of biogenic aerosol (methane sulfonic acid (MSA), non-sea salt sulfate nss <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="74b4be02f6bf1e477b176a208786a61b"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-22-9245-2022-ie00003.svg" width="29pt" height="17pt" src="acp-22-9245-2022-ie00003.png"/></svg:svg> ) 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 ...