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Discussion papers | Copyright
https://doi.org/10.5194/acp-2017-1218
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Feb 2018

Research article | 13 Feb 2018

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Are EARLINET and AERONET climatologies consistent? The case of Thessaloniki, Greece

Nikolaos Siomos1, Dimitris S. Balis1, Kalliopi A. Voudouri1, Eleni Giannakaki2,4, Maria Filioglou1,2, Vassilis Amiridis3, Alexandros Papayannis5, and Konstantinos Fragkos6 Nikolaos Siomos et al.
  • 1Laboratory of atmospheric physics, Physics Department, Aristotle University of Thessaloniki, Greece
  • 2Finnish Meteorological Institute, Atmospheric Research Center of Eastern Finland, Kuopio, Finland
  • 3Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece
  • 4Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, Greece
  • 5National Technical University of Athens, Physics Department, Laser Remote Sensing Laboratory, Athens, Greece
  • 6National Institute of R&D in Optoelectronics, Magurele, Romania

Abstract. In this study we investigate the climatological behavior of the aerosol optical properties over Thessaloniki during the years 2003–2017. For this purpose, measurements of two independent instruments, a lidar and a sunphotomer, were deployed. These two instruments represent two individual networks, the European Lidar Aerosol Network (EARLINET) and the Aerosol Robotic Network (AERONET). They include different measurement schedules. Fourteen years of lidar and sunphotometer measurements were analyzed in order to obtain the annual cycles and trends of multiple optical and geometrical aerosol properties in the boundary layer, in the free troposphere and for the whole atmospheric column. The analysis resulted in consistent statistically significant and decreasing AOD 355nm trends of −21.0% and −16.6% per decade in the study period over Thessaloniki for the EARLINET and the AERONET datasets respectively. Therefore, the analysis implies that the EARLINET sampling schedule can be quite effective in producing data that can be applied to climatological studies. It has also been confirmed that the observed decreasing trend is mainly attributed to changes in the aerosol properties inside the boundary layer. Seasonal profiles of the most dominant aerosol mixture types have been generated from the lidar data. The higher values of the extinction at 355nm appear in summer, while the lower ones appear in winter. The dust component is much more dominant in the free troposphere than in the boundary layer during summer while the opposite is observed in winter. The strongest biomass burning episodes tend to occur during summer in the free troposphere and are probably attributed to wildfires rather than agricultural fires that are predominant during spring and autumn. This kind of information can be quite useful for applications that require a priori aerosol profiles. For instance, they can be utilized in models that require aerosol climatological data as input, in the development of algorithms for satellite products, and also in passive remote sensing techniques that require knowledge of the aerosol vertical distribution.

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Nikolaos Siomos et al.
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In this study we investigate the climatological behavior of the aerosol optical properties over Thessaloniki during the years 2003–2017. For this purpose, measurements from two individual networks, the European Lidar Aerosol Network (EARLINET) and the Aerosol Robotic Network (AERONET) were deployed. The analysis implies that the EARLINET sampling schedule can be quite effective in producing data that can be applied to climatological studies.
In this study we investigate the climatological behavior of the aerosol optical properties over...
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