New aerosol particle formation in different synoptic situations at Hyytiala, Southern Finland

authorCount :7
We examine the meteorological conditions favourable for new particle formation as a contribution to clarifying the responsible processes. Synoptic weather maps and satellite images over Southern Finland for 2003-2005 were examined, focusing mainly on air mass types, atmospheric frontal passages. and cloudiness. Arctic air masses are most favourable for new aerosol particle formation in the boreal forest. New particle formation tends to occur on days after passage of a cold front and on days without frontal passages. Cloudiness, often associated with frontal passages, decreases the amount of: solar radiation. reducing the growth of new particles. When cloud cover exceeds 3-4 octas, particle formation proceeds at a slower rate or does not occur at all. During 2003-2005, the conditions that favour particle formation Lit Hyytiala (Arctic air mass, post-cold-frontal passage or no frontal passage and cloudiness less than 3-4 octas) occur oil 198 d. On 105 (57%) of those days, new particle formation occurred, indicating that these meteorological conditions alone can favour, but are not sufficient for, new particle formation and growth. In contrast, 53 d (28%) were classified as undefined days; 30 d (15%) were non-event days, where no evidence of increasing particle concentration and growth has been noticed.

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
continental boundary-layer
ion-induced nucleation
sulfuric-acid
size distribution
warm-front
meteorological parameters
air masses
smear-ii
growth
model
Meteorology
Meteorologi
NATURAL SCIENCES
NATURVETENSKAP

Saukkonen, L. (författare)
Nilsson, E. D.Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM) (författare)
Dal Maso, M. (författare)
Schultz, David M. (författare)
De Leeuw, G. (författare)
Kulmala, M. (författare)
Stockholms universitetInstitutionen för tillämpad miljövetenskap (ITM) (creator_code:org_t)

Ingår i:Tellus. Series B, Chemical and physical meteorology: Stockholm University Press60:4, s. 485-4940280-65091600-0889

Av författaren/redakt...: Sogacheva, L.; Saukkonen, L.; Nilsson, E. D.; Dal Maso, M.; Schultz, David M ...; De Leeuw, G.; visa fler...; Kulmala, M.; visa färre...

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