Development of particle number size distribution near a major road in Helsinki during an episodic inversion situation

2007 ◽  
Vol 41 (8) ◽  
pp. 1759-1767 ◽  
Author(s):  
Veli-Matti Kerminen ◽  
Tuomo A. Pakkanen ◽  
Timo Mäkelä ◽  
Risto E. Hillamo ◽  
Markus Sillanpää ◽  
...  
Keyword(s):  
Size Distribution ◽  
Particle Number ◽  
Major Road ◽  
Number Size Distribution ◽  
Particle Number Size Distribution

scholarly journals Evaluation and modeling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part II: Aerosol measurements within the SAPPHIRE project

2007 ◽  
Vol 7 (15) ◽  
pp. 4081-4094 ◽  
Author(s):  
T. Hussein ◽  
J. Kukkonen ◽  
H. Korhonen ◽  
M. Pohjola ◽  
L. Pirjola ◽  
...  
Keyword(s):  
Size Distribution ◽  
Aerosol Particle ◽  
Particle Number ◽  
Model Simulation ◽  
Ultrafine Particle ◽  
Traffic Density ◽  
Major Road ◽  
Urban Background ◽  
Number Size Distribution ◽  
Particle Number Size Distribution

Abstract. This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003 and 14 January–11 February 2004. The available information also included electronic traffic counts, on-site meteorological measurements, and urban background particle number size distribution measurement. The ultrafine particle (UFP, diameter<100 nm) number concentrations at the roadside site were approximately an order of magnitude higher than those at the urban background site during daytime and downwind conditions. Both the modal structure analysis of the particle number size distributions and the statistical correlation between the traffic density and the UFP number concentrations indicate that the UFP were evidently from traffic related emissions. The modeling exercise included the evolution of the particle number size distribution nearby the road during downwind conditions. The model simulation results revealed that the evaluation of the emission factors of aerosol particles might not be valid for the same site during different time.

scholarly journals The effect of local sources on aerosol particle number size distribution, concentrations and fluxes in Helsinki, Finland

Tellus B ◽  
2013 ◽  
Vol 65 (1) ◽  
pp. 19786 ◽  
Author(s):  
Giovanna Ripamonti ◽  
Leena Järvi ◽  
Bjarke Mølgaard ◽  
Tareq Hussein ◽  
Annika Nordbo ◽  
...  
Keyword(s):  
Size Distribution ◽  
Aerosol Particle ◽  
Particle Number ◽  
Number Size Distribution ◽  
Local Sources ◽  
Particle Number Size Distribution

scholarly journals Vertical and horizontal variation of aerosol number size distribution in the boreal environment

2016 ◽  
Author(s):  
Riikka Väänänen ◽  
Radovan Krejci ◽  
Hanna E. Manninen ◽  
Antti Manninen ◽  
Janne Lampilahti ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Size Distribution ◽  
Planetary Boundary Layer ◽  
Particle Number ◽  
Ground Level ◽  
Number Concentration ◽  
Field Station ◽  
Airborne Measurements ◽  
Number Size Distribution ◽  
Particle Number Size Distribution

Abstract. This study explores the vertical and horizontal variability of the particle number size distribution from two flight measurements campaigns over a boreal forest in Hyytiälä, Finland during May–June 2013 and March–April 2014, respectively. Our other aims were to study the spatial extent of new particle formation events and to compare the airborne observation with the ground measurements from the SMEAR II (Station for Measuring Ecosystem-Atmosphere Relations) field station located in Hyytiälä. The airborne measurements extended vertically 3.8 km and horizontally 30 km from the station. A Cessna 172 aircraft was used as a measurement platform. The measured parameters included the particle number concentration (> 3 nm) and particle number size distribution (10–400 nm). The airborne data used in this study were equal to 111 flight hours. The measurements showed that despite local fluctuations there was a good agreement between the on-ground and airborne measurements inside the planetary boundary layer. On median, the airborne total number concentration was found to be 10 % larger than at the ground level. The seasonal and meteorological differences between the campaigns were reflected in aerosol properties. NPF days showed areas of intensified NPF on a scale from kilometres up to couple of tens of kilometres in the planetary boundary layer. NPF was also observed frequently in the free troposphere.

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