Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS)

Duration: Longterm observations spanning multiple decades
Funding: various (see below)
Contact: Benjamin Brem and Martin Gysel-Beer,

Table of Contents

Observation network of the Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS). Source:

The Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS) is the pan-European research infrastructure producing high-quality data and information on short-lived atmospheric constituents and on the processes leading to the variability of these constituents in natural and controlled atmospheres.

ACTRIS Science:

The Aerosols, Clouds and Trace gases Research Infrastructure (ACTRIS) is a distributed infrastructure dedicated to high-quality observation of aerosols, clouds, trace gases and exploration of their interactions. It will deliver precision data, services and procedures regarding the 4D variability of clouds, short-lived atmospheric species and the physical, optical and chemical properties of aerosols to improve the current capacity to analyse, understand and predict past, current and future evolution of the atmospheric environment. ACTRIS serves a vast community of users working on observations, experiments, models, satellite data, analysis and predicting systems. It offers access to advanced technological platforms for exploration of the relevant atmospheric processes in the fields of climate change and air quality.

Included in ESFRI Roadmap in 2016, the ACTRIS European Research Infrastructure Consortium (ACTRIS-ERIC) is about to be implemented as a legal entity before the end of 2021.

ACTRIS web page:

ESFRI project and landmarks:

ACTRIS-IMP project

Duration: 2020-2024
Funding: European Commission under Horizon 2020 – Research and Innovation Framework Programme, H2020-INFRADEV-2019-2, Grant Agreement number: 871115
Contact: Martin Gysel-Beer (

The transition of ACTRIS towards an ERIC and implementation of the ERIC is supported through the ACTRIS-IMP project. ACTRIS-IMP further supports pilot phase transnational access to the JFJ national facility.

Duration: 2021-2024 (implementation phase)
Funding: Swiss State Secretariat for Education Research and Innovation (SERI)
Contact: Martin Gysel-Beer,

Atmospheric composition and processes play a key role in environmental and societal challenges such as air quality, adverse health impacts or climate change. Permanent and long-term observations of aerosols, clouds and trace gases at distributed National Facilities are performed by ACTRIS ERIC member countries. This is vital for producing observational data products of high quality and with sufficient spatial coverage, making them openly available for any kind of users and services, and providing a platform for researchers to address the challenges associated with these atmospheric constituents in an effective and comprehensive manner.

In ACTRIS, the National Facilities are comprised of i) Observational Platforms, which cover the classical measurements of atmospheric air pollutants and cloud properties at rural and background sites and of ii) Exploratory Platforms, which are additional facilities for answering more science-based questions, such as atmospheric simulation chambers and mobile installations. ACTRIS also has European level Central Facilities which include Head Office, Data Centre and Topical Centres for training, calibration and operation support.

PSI is coordinating the ACTRIS Switzerland (ACTRIS-CH) consortium with Empa, University of Berne, ETH Zurich, PMOD/WRC and MeteoSwiss as further partners. Altogether, ACTRIS-CH contributes to two Topical Centres of ACTRIS and runs two Observational Platforms as well as one exploratory platform as National Facilities of ACTRIS, as illustrated in below figure. PSI is involved in multiple National Facilities of ACTRIS, as detailed in the following.

National Facilities and contributions to Central Facilities during implementation of ACTRIS Switzerland (ACTRIS-CH) as foreseen to be integrated in the ACTRIS ERIC.

Jungfraujoch observational platform (JFJ)

Contact: Benjamin Brem ( and Martin Gysel-Beer (

The research programmes on trace gases (i.e. greenhouse gases, reactive air pollutants) and aerosols at the Jungfraujoch (JFJ, 3571 m a.s.l.) are among the most comprehensive worldwide. The JFJ research station, operated by the foundation High Altitude Research Stations Jungfraujoch & Gornergrat (HFSJG), is the highest research station in Europe that is accessible all year by rail, and it is the only accessible observation point in Europe with adequate infrastructure that is within the free troposphere most of the year. Therefore, the JFJ station is of utmost importance for ground-based observations of the free troposphere, which is reflected by its participation in more than thirty national and international networks for atmospheric research. EMPA continuously measures more than 70 gaseous species of reactive gases and greenhouse gases including some of their isotopes. PSI measures all aerosol variables including aerosol physical, optical and chemical properties. As the observatory is within clouds around 40% of the time throughout the year, it provides a unique opportunity for in situ studies of liquid clouds (in summer) and mixed-phase and glaciated clouds (in winter). Continuous cloud in-situ observations are covered by ETH Zurich.

Transnational access opportunities to this user facility are made available through the ACTRIS-IMP and ATMO-ACCESS projects (see also below).

Payerne observational platform (PAY)

Contact: Benjamin Brem ( and Martin Gysel-Beer (

The Aerological Station of Payerne is operated by the Federal Office of Meteorology and Climatology MeteoSwiss. Observations include continuous remote sensing profiling of atmospheric parameters (relative humidity, temperature, and wind profiles), aerosols (optical and microphysical parameters), and clouds (cloud base height and cloud cover) within EARLINET (one of the predecessors of ACTRIS) since 2008 and AERONET since 2018. MeteoSwiss also operates microwave radiometers and Doppler lidars and radars and performs radio soundings twice a day providing high quality temperature, humidity and wind profiles. The parameters covered by continuous observations are being upgraded as part of ACTRIS-CH implementation. PSI adds a range of in-situ aerosol observations to determine aerosol physical, optical and chemical properties. The University of Berne together with MeteoSwiss add advanced cloud remote sensing capabilities. It is foreseen to integrate the Payerne site together with the Beromünster site (operated by Empa/NABEL) as Swiss Midland national facility in the ACTRIS-ERIC that covers a comprehensive set of observations of short-lived atmospheric constituents through multiple in-situ and remote sensing approaches.

PSI Atmospheric Chemistry Simulation chamber exploratory platform (PACS)

Contact: Dave Bell ( and Imad El Haddad (

PACS is a stationary 9 m3 cool chamber that can be operated in the temperature range from -10 °C to +30 °C. PSI has a full complement for state-of-the-art instrumentation. The chamber can be equipped with the following gas-phase instruments: a proton-transfer reaction time of flight mass spectrometer, a chemical ionisation atmospheric pressure interface time of flight MS, as well as the standard NOx and ozone monitors. A whole suite of instruments is available for the characterisation of the particle phase. Specific expertise includes generation of complex emissions from a range of combustion sources present in the atmosphere (e.g., wood or coal combustion).

Transnational access opportunities to this user facility are made available through the ATMO-ACCESS project (see also below).

Scientific and logistical assistance as well as financial support for performing experiments at the JFJ and PACS facilities is provided through ACTRIS with financial support through the transnational access schemes of the ACTRIS-IMP and ATMO-ACCESS projects. Please do not hesitate to approach the contacts provided for each facility if you were e.g. interested in running an instrument that complements our experimental setup or in performing an experiment addressing your own research question. Besides such user driven access, we also publish calls for access as part of foreseen experiments addressing a predefined research question.
More information is provided on the website of the ACTRIS-ERIC, which also serves as entry point for the formal TNA application process:

Open calls for access

  •  ACTRIS-IMP pilot TNA 2nd call: Carbon balance field campaign at Jungfraujoch research station. See PDF for details.
  • User driven access: please do not hesitate to contact us at any time.

Duration: 2021-2025
Funding: European Commission under Horizon 2020 - Research and Innovation Framework Programme, H2020-INFRAIA-2020-1, Grant Agreement number: 101008004
Contact: Martin Gysel-Beer ( and Dave Bell (

ATMO-ACCESS is the organized response of distributed atmospheric research facilities for developing a pilot for a new model of Integrating Activities. The project will deliver a series of recommendations for establishing a comprehensive and sustainable framework for access to distributed atmospheric Research Infrastructures (RI), ensuring integrated access to and optimised use of the services they provide. ATMO-ACCESS mobilizes extensive resources in the atmospheric RIs communities to engage into harmonizing access procedures in relation to policies, financial regulations and conditions for access. It will develop and test innovative modalities of access to facilities and complementary and more advanced services, including digital services, developed as part of cross-RI efforts. ATMO-ACCESS will open physical and remote access to 43 operational European atmospheric research facilities, including ground-based observation stations, simulation chambers, but also mobile facilities and central laboratories that are fundamental elements in distributed RIs. Innovative cross-RI cloud services, addressing the management of data produced via access and the use of new, integrated data products, but also virtual tools for training, are offered through virtual access to RI data centres. All work in ATMO-ACCESS integrates experiences from past access programs, thus, synergistically streamlining the work and avoiding duplication of efforts. ATMO-ACCESS will continuously engage with users and with national and international stakeholders to propose optimal conditions for a coherent and effective framework of access that has been sufficiently tested and is supported by the relevant user and stakeholder groups to establish and ensure the long-term sustainability of access with the European RI landscape.

The ATMO-ACCESS project provides financial support for trans-national access opportunities to the JFJ and PACS national facilities.

Web page:

ACTRIS-CH is tightly linked to the Swiss contribution to the Global Atmosphere Watch programme, which is coordinated by MeteoSwiss. Further info at:

PSI: GAW Aerosol Montioring at Jungfraujoch

MeteoSwiss: GAW-CH

The ACTRIS ERIC combines the heritage of multiple EU-funded infrastructure development projects that addressed different components which are now integrated in the ACTRIS ERIC:

  • ACTRIS-ERIC implementation: ACTRIS-PPP
  • Aerosol in-situ observations: EUSAAR ACTRIS → ACTRIS-2
  • Aerosol remote sensing: EARLINET
  • Chamber facilities: EUROCHAMP → EUROCHAMP-2 → EUROCHAMP-2020
  • Cloud remote sensing: CLOUDNET
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    Automated identification of local contamination in remote atmospheric composition time series
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    The diurnal and seasonal variability of ice-nucleating particles at the high altitude station Jungfraujoch (3580 m a.s.l.), Switzerland
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    Assessing local CO2 contamination revealed by two near-by high altitude records at Jungfraujoch, Switzerland
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    Multidecadal trend analysis of in situ aerosol radiative properties around the world
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    The second ACTRIS inter-comparison (2016) for Aerosol Chemical Speciation Monitors (ACSM): calibration protocols and instrument performance evaluations
    Aerosol Science and Technology. 2019; 53(7): 830-842.
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