Some on-line data
All times are UTC+2
Instructions for database use
Data from Hyytiälä station
here
Weather from Helsinki station
here
Gas concentrations and station temperature from Helsinki station
here
EddyCPC
here
Data from Värriö station
hereData from K-Puszta
here
HSY DMPS data
here
Particle concentration
data from Helsinki, Hyytiälä and Värriö stations
Helsinki station is a
typical urban
background station. Aerosol particle concentration is governed mainly
by the local activities (weekday-weekend, traffic), meteorological
conditions (mixing height, wind speed, inversion situation) and long
range
transport (North Atlantic or Eastern Europe air masses).
Hyytiälä station is a rural boreal forest station with some
local pollution from the near-by field station and a local village five
kilometres away. Particle concentrations is governed by local
production by nucleation (Events) and long range transport.
Värriö station is a remote subarctic station. Particle
concentrations is governed by local production by nucleation (Events)
and long range transport (Kola peninsula).
Particle size distribution
from Helsinki station
Particle size
distributions are
measured with Differential mobility particle sizers (DMPS). The
instrument classifies the particles according to their electrical
mobility, which is dependent on the particle size and charge. The first
plot presents the particle number size distribution. Size is on the
y-axis and time on the x-axis. Particle concentration is on the z-axis.
The more red the colour is the more particles there exists in the given
size class and time. Particles transported to the site further away
have typically size around 100nm or more. Particles produced locally by
traffic have size between 10 and 100 nm. Particles produced locally in
the near future by gas to particle formation have a diameter less than
10nm when they are "fresh". With time more material condense
on
them and their size increases ("banana curve")
