Atmospheric measurements

The Atmospheric Measurements group studies tropospheric aerosols and their interaction with cloud droplets and ice nuclei by conducting long-term in-situ and Lidar measurements.

The aerosol-cloud-ice nuclei interactions and cloud formation are studied at Puijo measurement station, which is in cloud for about 15 per cent of time. At Puijo, the continuous measurements have been running since 2006 and intensive measurement campaigns are organized annually.

Puijo tower surrounded by a cloud
The Puijo tower during a cloud event. Photo: Pekka Ahponen

The vertical distribution of tropospheric particles are studied by using Lidars to obtain information of the particle properties and their residence height or the wind profile.

Puijo tower surrounded by a cloud
A Lidar sends a laser beam into the sky and analyzes the light scattered from particles

The group is also involved in studies of aerosol transformation and health effects in conditions simulating real life exposures. This is done in a lately built research environment, called Ilmari, including combustion emission sources, an environmental chamber, and an on-line air-liquid interface cell exposure unit.

Puijo tower surrounded by a cloud
The Ilmari research environment consists of (1) biomass burning appliances, (2) a vehicle dynamometer, (3) different dilution appliances, (4) an environmental chamber, (5) a cell exposure system, and (6) gas and particle analyzers.

The group works in close collaboration with aerosol research groups at the University of Eastern Finland. We also actively participate in international campaigns elsewhere in Finland and abroad.

Puijo tower surrounded by a cloud
The group performs, e.g., air quality measurements in Nanjing, China.