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Ground Based Remote Sensing

"In ReACT we are using active and passive remote sensing to investigate atmospheric processes of importance to climate research, weather forecast, aviation and air quality.
Our experimental and theoretical work is dedicated to studies of aerosols, clouds, water vapour and their interactions using measurements from our ground-based long-term stations (Athens, Antikythera, Finokalia), dedicated experimental campaigns, and long-lived space borne sensors.
Key topics of our research are:
  • The investigation of the processes that determine the life cycle of dust and its interactions with clouds and radiation.
  • The development of new lidar instruments for dedicated studies (e.g. new polarimetric observations, evaluation of space borne lidar missions).
  • The investigation of key atmospheric parameters (e.g. optical and physical properties of aerosols, clouds, water vapor, temperature, wind) above the Mediterranean.
  • The 24/7 monitoring of the atmosphere, from the ground up to the stratosphere, supporting governmental and European infrastructures regulating aviation and air quality hazards (e.g. volcano eruptions, fires)."

       - Dr. Eleni Marinou

Numerical Modeling

"In ReACT we work on numerical model development and applications with focus on the representation of atmospheric dynamics at all scales, the description of aerosol interactions and feedbacks in the atmosphere (direct and indirect effects), severe atmospheric phenomena (e.g. hurricanes, floods, duststorms), air pollution, dispersion modeling (e.g. dust, smoke, volcanic ash), modeling-remote sensing synergies (e.g. satellite assimilation, source-receptor apportionment) and operational weather forecast. Atmospheric modeling research and applications in ReACT is facilitated through a number of numerical tools such as WRF (ARW,CHEM, NMM), RAMS, DREAM, NMMB, FLEXPART and HYSPLIT."
                            - Dr. Stavros Solomos

Satellite Remote Sensing

"Contemporary satellite instruments, providing accurate long-term observations at global scale, consist a fundamental tool in aerosol research. Relied on different remote sensing techniques, spaceborne sensors provide information about suspended particles’ load and nature, which are both highly variable in spatial and temporal terms. Our team has vast experience on the implementation of active and passive aerosol retrievals, acquired from lidars (e.g., CALIOP, CATS) and spectroradiometers (e.g., MODIS), in a wide range of scientific tasks. The in-house developed ESA-LIVAS database, in which a global 4D depiction of aerosols and clouds has been realized through the utilization of CALIOP vertically resolved observations, consists the flagship of the satellite component of the ReACT group. Advanced techniques, applied and tested at the ground, have been adopted in spaceborne observations making feasible a global view of fine/coarse dust aerosols and dust-related CCN/IN concentrations. Moreover, a global fine resolution dust optical depth dataset has been developed via the exploitation of MODIS and CALIOP data, whereas any possible multi-sensor synergy is considered aiming at optimizing aerosol loads’ description and characterization. One of the priorities of our team is the participation in the Cal/Val activities of ongoing (AEOLUS) and forthcoming (EarthCARE) satellite missions of the European Space Agency (ESA). Satellite observations are also analyzed for the investigation of outstanding cases (e.g., dust outbreaks, smoke transport, volcanic eruptions) as well as for the evaluation of numerical simulation aerosol outputs. Finally, in collaboration with modelling groups, satellite data are ingested in data assimilation schemes towards improving dust forecasting and monitoring. " 

                                                                               - Dr. Antonis Gkikas

About Us

ReACT stands for “Remote sensing of Aerosols, Clouds and Trace gases”, to describe the research focus of the respective research team led by Dr. Vassilis Amiridis. ReACT consists of highly motivated scientists within the field of Atmospheric Sciences, combining a number of Post-doc researchers, Ph.D. and M.Sc. students as well as other research and technical staff, using the resources, infrastructure and experience of the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS).

Address :

Vas.Sofias 79

Phone :

+30 210 81 09 182



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