Puijo Observatory - Panel Board

The Puijo site (62º54' N, 27º39' E) is located approximately 2 km northwest from the center of Kuopio on the top of an observation tower on Puijo hill. Measurements are made at the height of 306 m above sea level and 230 m above the surrounding lake level. The Puijo site is supported by observations in Savilahti at the campus area of the University of Kuopio, approximately 2 km southwest from Puijo and approximately 2 km west from the center of Kuopio. The site is at the height of 87 m above sea level and 5 m above the surrounding lake level.

At Savilahti, the FMI has an automated weather station measuring several meteorological parameters, including the cloud base height measured with a ceilometer, sun photometer and other solar radiation components. The Puijo station is operated by Finnish Meteorological Institute (FMI) and University of Kuopio (Department of Physics). The present instrumentation covers meteorological parameters, aerosol size distribution and number concentration, light scattering from and absorption to aerosol particles, cloud droplet size distribution, trace gas concentration (O3, NOx, SO2), and several meteorological parameters. The aerosol size distribution is measured through two inlets: one, which removes the cloud droplets and particles below 2.5 µm size, and the total air inlet, which allows cloud droplets to enter the sampling line. In the total air inlet the cloud droplets are dried and the remaining residual particles are also measured.

By this method, the difference in the in-cloud and out-of-cloud aerosol size distributions is calculated, giving the fraction of activated particles as a function of particle size. Within the ICOS project, measurements of methane and carbon dioxide will be started in the Puijo tower in the same instrument room as the other measurements. Sample inlet will be on the roof just above the instrument room minimizing the sampling line problems. Also the flask samples can be collected in without long sampling lines. The measurement system is connected to the net. There are urban or suburban areas in some wind directions but extensive set of aerosol and air pollution species measured makes it easy to flag the contaminated samples. The plumbing of the Picarro monitor will be most simple exploring this possibility of constructing the most trouble free system. The sample air will be dried using one Nafion drier which also equilibrates dry calibration gases.

Instrument 102 | Meteo | Diagnostic parameters

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