Facilities

ACTRIS National Facilities consist of observational and exploratory platforms. Observational platforms are fixed ground-based stations that deliver long-term data based on a regular measurement schedule and common operation standards. Exploratory platforms are atmospheric simulation chambers, laboratory platforms and mobile platforms that perform dedicated experiments and contribute data on atmospheric constituents, processes, events or regions.

ACTRIS Central Facilities are the key operative entities of the Research Infrastructure, providing operation support to the National Facilities, and services to the ACTRIS users. Topical Centers are organised around the main scientific themes of ACTRIS: aerosol, clouds, and reactive trace gases, each with a particular focus on either remote sensing (from the ground) or in situ (near surface) measurement techniques.

Finland has 14 National Facilities fulfilling ACTRIS standards and contributes to five ACTRIS Central Facilities. The leadership of ACTRIS is in Finland; the statutory seat of ACTRIS ERIC (est. April 2023) and ACTRIS Head Office is located in Helsinki (with a Unit also in Italy). University of Helsinki leads a unit in Centre for Aerosol In Situ Measurements and a unit in Centre for Reactive Trace Gases In Situ Measurements. Finnish Meteorological Institute leads a unit in Centre for Cloud Remote Sensing and a unit in ACTRIS Data Centre.

UH = University of Helsinki, FMI = Finnish Meteorological Institute, UEF = University of Eastern Finland

• SMEAR I (Värriö, UH): Aerosol in situ, Cloud in situ, Reactive trace gases in situ. PI: Mikko Sipilä.
• SMEAR II (Hyytiälä, UH): Aerosol in situ, Reactive trace gases in situ, Aerosol remote sensing, Cloud remote sensing. PI: Tuukka Petäjä
• SMEAR III (Helsinki, UH&FMI): Aerosol in situ, Reactive trace gases in situ. PI: Leena Järvi and Tuukka Petäjä.
• SMEAR IV (Kuopio, UEF&FMI): Aerosol in situ, Cloud in situ. PI: Annele Virtanen and Mika Komppula
• Pallas Atmosphere-Ecosystem Supersite (FMI): Aerosol in situ, Cloud in situ, Reactive trace gases in situ, Cloud remote sensing. PI: Antti Hyvärinen.
• Utö Atmospheric and Marine Research Station (FMI): Aerosol in situ, Reactive trace gases in situ. PI: Antti Hyvärinen.
• Marambio (Antarctic Peninsula, FMI): Aerosol in situ. PI: EIja Asmi.

UH = University of Helsinki, FMI = Finnish Meteorological Institute, UEF = University of Eastern Finland, TAU = Tampere University

• Multi-wavelength Raman Lidar (FMI, mobile): Aerosol remote sensing. PI: Mika Komppula.
• Doppler Cloud Radar (FMI, mobile): Cloud remote sensing. PI: Ewan O'Connor.
• Doppler Lidar (FMI, mobile): Cloud remote sensing. PI: Ewan O'Connor.
• Mobile Aerosol Laboratory (TAU, mobile):  Aerosol in situ, Reactive trace gases in situ. PI: Miikka Dal Maso, Jorma Keskinen.
• Unmanned Aerial Vehicle (FMI, mobile):  Aerosol in situ, Cloud in situ. PI: David Brus.
• Kuopio Atmospheric Simulation Chambers, KASCs (UEF, atmospheric simulation chamber): Aerosol in situ. PI: Annele Virtanen.
• Aerosol, cluster and trace gas laboratory (UHEL, laboratory): Aerosol in situ, Reactive trace gases. PI: Tuukka Petäjä.

• ACTRIS ERIC Head Office: PI: ACTRIS ERIC Director General Eija Juurola (note that ACTRIS ERIC is not part of ACTRIS-FI but its own European organization located in Helsinki, Finland)
• Centre for Aerosol In Situ Measurements: Unit for nanoparticle number concentration and size distribution measurements (namely Cluster Calibration Centre, CCC) (UH). PI: Silja Häme
• Centre for Reactive Trace Gases In Situ Measurements: Unit for condensable vapor and aerosol presursor measurements using chemical ionisation mass spectrometry (namely CiGas-UHEL) (UH). PI: Silja Häme
• Centre for Cloud Remote Sensing: Unit for Doppler Lidar data processing and quality control (FMI). PI: Ewan O’Connor
• Data Centre: Unit for cloud remote sensing data (FMI). PI: Ewan O’Connor