Members of the APCG group are involved with numerical model applications from the global to the local spatial scales.

They perform

earth system,


chemical transport


radiative transfer


  modeling picture 


1. Earth system model: The European community Earth-System Model EC-Earth ( ) is applied. The model has been extended with an on-line atmospheric chemistry scheme of the main nutrients (i.e., nitrogen, phosphorus and iron), taking into account dust minerals, bioaerosols and combustion aerosols.


2. Regional atmospheric model: COSMO-ART is a regional atmospheric model which couples online meteorology, chemistry, and aerosol dynamics. COSMO is the operational numerical weather prediction model of the German and other European weather services (Baldauf et al., 2011) and is used as a regional climate model in a modified version CCLM (Rockel et al., 2008). ART (Aerosols and Reactive Trace gases) is the chemistry extension of COSMO. Detailed descriptions of the model, the physic-chemical characteristics of the aerosol modes and the parameterizations of interactions of aerosols with radiation, temperature, cloud and ice condensation nuclei (CCN and IN), are given in Vogel et al. (2009), Bangert et al. (2011; 2012), and Rieger et al. (2014). The model domain chosen for the research activities of the APCG group is the extended area of Greece, centered on Athens. The setup of the model applications is given in Athanasopoulou et al (2017), largely based on the pilot study of the COSMO-ART application over the same domain (Athanasopoulou et al., 2014).

Computational time and space is systematically granted by the GRNET (HPC ARIS).

 EPISODE CityChem  3. Local chemistry transport model: The CityChem extension (Karl et al., 2019), developed at Helmholtz-Zentrum Geesthacht (HZG) is designed for treating complex atmospheric chemistry in urban areas and improved representation of the near-field dispersion (Karl et al., 2019). The model is an extension of the EPISODE dispersion model to enable chemistry/transport simulations of reactive pollutants on city scale. EPISODE is an Eulerian dispersion model developed at the Norwegian Institute for Air Research (NILU) appropriate for air quality studies at the local scale (Slørdal et al., 2003; Slørdal et al., 2008).

 The model is applied over the Athens urban center to study AQ in the intra-urban scale.

4. Solar energy services: Operational running in real-time for the European and North Africa domain, using a Rack PC, Windows server with CentOS, 32 cores, 64 Gb RAM, 12 Tb RAID10. When advanced, dynamic and large scale applications are performed, using and producing big data for solar energy, then the Cloud GRNET with Openstack technology, Unix, 64 cores, 512 Gb RAM, 24 Tb is used.

  • Radiative transfer models: The radiative transfer models library libRadtran for the simulation of surface solar radiation and energy in terms of global horizontal and direct normal irradiances, the ultraviolet index, the photosynthetically active radiation, the vitamin D effective dose, the energy capture at tilted planes of any orientation
  • Fast solar spectral radiation computing architectures: Use of machine learning for instant radiative transfer simulations for solar energy related operational products and services
  • Cloud motion vector analysis: development of pattern identification and tracking algorithms for short-term forecasting purposes