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Observations of new particle formation events in the south-eastern Baltic Sea

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Author(s): Kristina Plauškaitė | Vidmantas Ulevicius | Narciza Špirkauskaitė | Steigvile Byčenkienė | Tymon Zieliński | Tomasz Petelski | Agnieszka Ponczkowska

Journal: Oceanologia
ISSN 0078-3234

Volume: 52;
Issue: 1;
Start page: 53;
Date: 2010;
Original page

Keywords: Nucleation events | Nucleation event characteristics | Backward air mass trajectories | Meteorological and chemical parameters | Coastal site

ABSTRACT
New particle formation and growth were observed at a coastal site (Preila station, Lithuania) during 1997 and 2000-2002. The total amountof data analysed covers 291 one-day periods, 45 (15%) of which were long-term, new particle formation days. Short-term nucleationevents (from a few minutes to one hour) and long-term events (from one to eight hours) were identified. The mean particlegrowth rate, condensation sink and condensable vapour source rate during nucleation events were 3.9 nm h-1, 1.45 × 10-3 cm-3 s-1 and 7.5 × 104 cm-3 s-1 respectively.The average formation rate J10 was 0.4 cm-3 s-1. The nucleation events were accompaniedmainly by air masses transported from the north (43%) and north-west (19%). Meteorological parameters and trace gas (O3, SO2,NO2) concentrations were also analysed. It was found that nucleation events are related to high levels of solar radiation.