Contribution of water-soluble organic matter from multiple marine geographic eco-regions to aerosols around Antarctica

Research output: Contribution to journalArticlepeer-review

Authors

  • Matteo Rinaldi
  • Marco Paglione
  • Stefano Decesari
  • David C.S. Beddows
  • Jurgita Ovadnevaite
  • Darius Ceburnis
  • Colin O´Dowd
  • Rafel Simó

External organisations

  • Department of Environmental Sciences/Center of Excellence in Environmental Studies, King Abdulaziz University
  • School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
  • Institute of Atmospheric Sciences and Climate of the National Research Council of Italy (ISAC-CNR)
  • Birmingham University
  • National University of Ireland Galway
  • School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
  • CSIC - Instituto de Ciencias del Mar (ICM)

Abstract

We present shipborne measurements of size-resolved concentrations
of aerosol components across ocean waters next to the Antarctic Peninsula,
South Orkney Islands, and South Georgia Island, evidencing aerosol features
associated with distinct eco-regions. Nonmethanesulfonic acid Water-Soluble
Organic Matter (WSOM) represented 6−8% and 11−22% of the aerosol PM1
mass originated in open ocean (OO) and sea ice (SI) regions, respectively. Other
major components included sea salt (86−88% OO, 24−27% SI), non sea salt
sulfate (3−4% OO, 35−40% SI), and MSA (1−2% OO, 11−12% SI). The
chemical composition of WSOM encompasses secondary organic components with diverse behaviors: while alkylamine concentrations were higher in SI air masses, oxalic acid showed higher concentrations in the open ocean air. Our online singleparticle mass spectrometry data exclude a widespread source from sea bird colonies, while the secondary production of oxalic acid and sulfur-containing organic species via cloud processing is suggested. We claim that the potential impact of the sympagic planktonic ecosystem on aerosol composition has been overlooked in past studies, and multiple eco-regions act as distinct aerosol sources around Antarctica.

Details

Original languageEnglish
Pages (from-to)7807-7817
Number of pages11
JournalEnvironmental Science and Technology
Volume54
Issue number13
Early online date5 Jun 2020
Publication statusPublished - 7 Jul 2020

ASJC Scopus subject areas