Provision of diverse platforms with manifolds equipped with ACTRIS-ICOS compliant sampling systems for in-situ aerosol and reactive and greenhouse gases for exercises of instrument intercomparison. The platforms are hosted in two air-conditioned shelters equipped with internet. Multiple inlets to the sampling systems are available for the external users. Provision also of a 300 m² open terrace which overpass the pines canopy providing a 360º free horizon for optical field calibration and a radiometric calibration laboratory (absolute irradiance calibration and instrument characterization). All platforms are equipped with continuous power supply and security service.

 The service includes:

• Access to the intercomparison platforms at ARN.

• Administrative support for providing access to the facility, a workspace with internet access, and to advice on logistics for equipment transport and users and on accommodation near ARN observatory.

• Technical staff support to reception and storage of the transport cases, for adapting the facility to assemble the new equipment, for its installation (internet connection, power supply, etc) and for its operation.

• Provision of calibration or intercomparison reports.