Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-32047-4
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Funding
- European Union's Seventh Framework Programme (FP7/2007-2013) project BACCHUS [n_ 603445]
- Spanish Ministry of Economy and Competitiveness (MINECO) as part of the PEGASO project [CTM2012-37615]
- Spanish Ministry of Economy and Competitiveness (MINECO) as part of BIO-NUC project [CGL2013-49020-R]
- EPA Ireland
- Italian RITMARE fellowship
- Centre National d'Etudes Spatiales (CNES, Paris, France)
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN/04315-2014]
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Atmospheric aerosols in clean remote oceanic regions contribute significantly to the global albedo through the formation of haze and cloud layers; however, the relative importance of 'primary' windproduced sea-spray over secondary (gas-to-particle conversion) sulphate in forming marine clouds remains unclear. Here we report on marine aerosols (PM1) over the Southern Ocean around Antarctica, in terms of their physical, chemical, and cloud droplet activation properties. Two predominant pristine air masses and aerosol populations were encountered: modified continental Antarctic (cAA) comprising predominantly sulphate with minimal sea-salt contribution and maritime Polar (mP) comprising sulphate plus sea-salt. We estimate that in cAA air, 75% of the CCN are activated into cloud droplets while in mP air, 37% are activated into droplets, for corresponding peak supersaturation ranges of 0.37-0.45% and 0.19-0.31%, respectively. When realistic marine boundary layer cloud supersaturations are considered (e.g. similar to 0.2-0.3%), sea-salt CCN contributed 2-13% of the activated nuclei in the cAA air and 8-51% for the marine air for surface-level wind speed < 16 m s(-1). At higher wind speeds, primary marine aerosol can even contribute up to 100% of the activated CCN, for corresponding peak supersaturations as high as 0.32%.
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