Summertime Primary and Secondary Contributions to Southern Ocean Cloud Condensation Nuclei.

ABSTRACT: 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' wind-produced 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 dro

SUBMITTER: Fossum KN 

PROVIDER: S-EPMC6138724 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature