Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Studies of aerosols advected to coastal areas with the use of remote techniques

Zieliński T., Petelski T., Makuch P., Strzałkowska A., Ponczkowska A., Markowicz K., Chourdakis G., Georgoussis G., Kratzer S

Acta Geophysica

2012

Vol. 60, no. 5

1359-1385

This paper presents the results of the studies of aerosol optical properties measured using lidars and sun photometers. We describe two case studies of the combined measurements made in two coastal zones in Crete in 2006 and in Rozewie on the Baltic Sea in 2009. The combination of lidar and sun photometer measurements provides comprehensive information on both the total aerosol optical thickness in the entire atmosphere as well as the vertical structure of aerosol optical properties. Combination of such information with air mass back-trajectories and data collected at stations located on the route of air masses provides complete picture of the aerosol variations in the study area both vertically and horizontally. We show that such combined studies are especially important in the coastal areas where depending on air mass advection directions and altitudes the influence of fine or coarse mode (in this case possibly sea-salt) particles on the vertical structure of aerosol optical properties is an important issue to consider.

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

Plauškaite K., Ulevicius V., Špirkauskaite N., Byčenkiene S., Zieliński T., Petelski T., Ponczkowska A.

Oceanologia

2010

No. 52 (1)

53-75

New particle formation and growth were observed at a coastal site (Preila station, Lithuania) during 1997 and 2000-2002. The total amount of data analysed covers 291 one-day periods, 45 (15%) of which were long-term, new particle formation days. Short-term nucleation events (from a few minutes to one hour) and long-term events (from one to eight hours) were identified. The mean particle growth 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 x 104 cm-3 s-1 respectively. The average formation rate J_10 was 0.4 cm-3 s-1. The nucleation events were accompanied mainly 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.