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.
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.
| Original language | English |
|---|---|
| Pages (from-to) | 7807-7817 |
| Number of pages | 11 |
| Journal | Environmental Science and Technology |
| Volume | 54 |
| Issue number | 13 |
| Early online date | 5 Jun 2020 |
| DOIs | |
| Publication status | Published - 7 Jul 2020 |
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
