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Seasonal Trends of Marine CCN Sources in the Southern Ocean

Investigating marine CCN sources in the Southern Ocean, this research compares measurements and models to understand seasonality, emphasizing the impact of DMS emissions on CCN formation. Findings reveal a significant increase in CCN from November to April, with DMS playing a crucial role, especially from December to February. The study highlights the influence of wind speed, sea spray, and non-linear FT nucleation processes, shedding light on the complexity of aerosol dynamics in this region.

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Seasonal Trends of Marine CCN Sources in the Southern Ocean

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  1. Hannele's research since Hyytiälä • Now working at University of Kuopio, Finland • Global modelling of (marine) aerosols with GLOMAP (Univ. Leeds) • CCN seasonality in the Southern Ocean • geoengineering: controlled sea spray fluxes to increase albedo of low level marine clouds • changes in marine CCN sources due to climate change (wind speed, DMS) • Hoping to move to the continents (and SOA business) soon…

  2. Marine CCN sources in Southern Ocean • Comparison to measurements • seasonal trend captured well • seasonality not predicted if DMS emissions neglected • CCN increase due to DMS from November to April (max 48% in Jan); no winter effect • South of 45o S • DMS effect only from December to February • seasonality also in run with DMS emissions • strong winds -> sea spray source • oxidation of LRT SO2 -> non-linearity of FT nucleation • Over 94% of DMS effect via FT nucleation (the rest via growth of sea spray to CCN size)

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