Work has been performed according to the DoA to ensure implementation of ACTRIS services favouring provision of data of highest quality and use of ACTRIS facilities and resources. New data processing chains in most suited format have been developed for almost all ACTRIS components involving an increased number of stations. To date, ACTRIS data include about 110 different atmospheric variables, comprising about 80 different trace gases, 12 different in situ aerosol variables, 10 aerosol profile variables, 8 cloud profile variables. The measurements use almost 40 different methodologies with time resolution from seconds to 1 week. Additionally, ACTRIS provides near real time data (NRT) from about 25 sites. Significant access to calibrations centres has been offered (AERONET-Europe, LICAL, ECAC), technical developments made and implemented as Standard Operating Procedures, and training to young station operators provided. Higher than expected access to the observational ACTRIS-2 stations has been provided. ACTRIS TNA has outreach world-wide (with 14% of users from outside Europe) and to the private sector (23 different SMEs, recurrent access). To mention particularly:
• Set up of new measurement capabilities at a number of facilities operating aerosol and cloud profiling sites paralleled with development of common data products regarding aerosol, wind and water vapour (WP2).
• New Standard Operating Procedures (SOP) for sampling and analysis of a selection of organic tracers and VOCs, including SOP for on-line aerosol detection with Aerosol mass spectrometers (WP3).
• LiCal granted a total of 938.5 access days to 187 users, covering more than 115% from the initial estimated access for training, assistance for system debugging, quality checks, instrument characterization and inter-comparison also for non-EU users (13%), with a 24.6% of the users being women (WP6).
• AERONET-Europe granted 416 remote accesses to individual academic users, networks (UK Met Office, China) and SMEs (WP7). About 50% of the accesses are provided to users outside the ACTRIS consortium.
• The ECAC calibration and intercomparison workshops supported 323 projects (users) to address instrument and measurement uncertainties for measuring physical, optical and chemical aerosol properties (WP8).
• 17 ACTRIS advanced observational facilities in Europe have granted access to more than 150 research teams (370 users), accounting for 3202 access days (2195 estimated), with 10% from the private sector (WP9). More than 70% are new users and about 1/3 are young scientists.
• A specific Non-Disclosure Agreement was developed to facilitate the collaboration with the private sector under a mutual-support concept (WP4).
• ACTRIS Data Centre activities have increased significantly since project start with a significant number of different atmospheric variables, both in situ and profiles, available (WP10). Ca 25000 visits in the DC between 2015-2018 from 93 different countries to QA/QC and harmonized ACTRIS data and measurements, tools and new products, based on the ACTRIS Data Management Plan, recommendations and procedures. ACTRIS provides near real time data (NRT) from numerous sites with increased data flow: aerosol in situ NRT data is provided from 51 instruments distributed over 16 sites, practically all 9 ACTRIS cloud profile sites have provided data in NRT, and data of 17 aerosol profile sites are automatic transferred in NRT to the DC. The interoperability of DC with general international standards was facilitated in collaboration and compliance with the Environmental Research Infrastructures (ENVRI).
• Several relevant research campaigns were implemented within WP11 and 12 for developing new methodologies in the future. New tools are available for data analysis through the ACTRIS DC such as a toolbox to plot observations and model data (WP13).
