Research Fellow, Ph.D.


Contact Info:
e-mail: piraptisThis email address is being protected from spambots. You need JavaScript enabled to view it.
tel: (+30) 210 3490151


Institute for Environmental Research & Sustainable Development, National Observatory of Athens, I. Metaxa & Vas. Pavlou, P. Penteli (Lofos Koufou), 15236 Athens, Greece


Born in Athens, Greece, in 1983. Holds a Diploma of Physics (University of Athens, 2009), a M.Sc. degree in Environmental Physics (20011) and a Doctorate in Physics (2018) in the Physics dept. of the same university. His Ph.D. Thesis was in the field of Solar Measurements for aerosol  and  trace gases research titled “Aerosol, Trace Gases and Water Vapour optical properties study, using spectral measurements of solar irradiance”.  He has worked at Atmospheric Physics group of University of Athens, at APCG at National Observatory of Athens and at Physicalisch Meteorologisches Observatorium Davos, World Radiation Center at Davos, Switzerland. He is an expert on solar spectral measurements and developing tools and algorithms to retrieve atmospheric physical properties of aerosols and gases. He specializes in the installation, maintenance and operation of measuring equipment and the quality assurance procedures of the data. He has 12 accepted publications in peer reviewed scientific journals and 96 citations (25/03/2019, source google scholar) and 16 publications in conference proceedings.

Research Interests:

Real time aerosol chemical composition using online mass spectrometry, Source apportionment of organic aerosol utilizing receptor modeling techniques, Fine aerosol size distribution, nucleation and New Particle Formation, Absorption and scattering of light by airborne particles, Design and implementation of low-cost atmospheric monitoring networks, along with the development of calibration schemes for low-cost sensors

Solar radiation measurements and techniques using ground based and satellite based instrumentation, Aerosol research based on ground based sun-photometric measurements, Algorithm development for aerosol and trace gases retrieval, Aerosol and solar UV satellite validation activities, Development, characterization, calibration, quality control of solarspectroradiometerinstrumentation, Solar UV forecast and health effects

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