under a Creative Commons License. Atmospheric Chemistry and Physics New particle formation in air mass transported between two measurement sites in Northern Finland

• Main Authors: S. -l. Sihto, H. Korhonen, H. Lihavainen, V. -m. Kerminen, M. Kulmala, Y. Viisanen
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2006
• Subjects: Northern Finland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.405.1632; http://hal.archives-ouvertes.fr/docs/00/29/59/75/PDF/acp-6-2811-2006.pdf

Abstract. This study covers four years of aerosol number size distribution data from Pallas and Värriö sites 250 km apart from each other in Northern Finland and compares new particle formation events between these sites. In air masses of eastern origin almost all events were observed to start earlier at the eastern station Värriö, whereas in air masses of western origin most of the events were observed to start earlier at the western station Pallas. This demonstrates that particle formation in a certain air mass type depends not only on the diurnal variation of the parameters causing the phenomenon (such as photochemistry) but also on some properties carried by the air mass itself. The correlation in growth rates between the two sites was relatively good, which suggests that the amount of condensable vapour causing the growth must have been at about the same level in both sites.