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Remote Sensing Station (ARSS)
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Remote Sensing Station (ARSS)

ARSS Instrumentation



ARSS is equipped with a CIMEL CE318-NEDPS9 sunphotometer for the retrieval of aerosol optical depth at 8 wavelengths from 340 to 1640 nm, including polarization measurements. The measurements of aerosol optical depth are at a rate approximately 1 measurement per 15 minutes when the sun is not obstructed by clouds. In addition, it performs measurements of the diffuse sky radiance and using inversion algorithms it produces microphysical aerosol properties such as the single scattering albedo, the aerosol phase function, the asymmetry parameter, the indexes of refraction and the size distribution. The CIMEL instrument is a part of NASA’s AERONET (Aerosol Robotic Network) network (http://aeronet.gsfc.nasa.gov). The data are processed every day (level 2.0 Quality Assured) and are available at AERONET’s webpage along with the aerosol inversion retrievals for the complete aerosol characterization (e.g. Saharan dust events, smoke cases etc). The instrument is located on the roof of the Research Center for Atmospheric Physics and Climatology of the Academy of Athens with an elevation of 130 m from mean sea level. The campus is located in the city center and 10 km from the sea.


Photo of UV-MFR instrument for radiation measurements
UV-MFR instrument for radiation measurements

ARSS is additionally equipped with a UV-MFR instrument for radiation measurements in the UV spectral region. It provides measurements from 305nm to 368nm (UVB and UVA) with a resolution of 1 minute under all conditions. The instrument with a use of a shadowing disc is able to provide global (total) and diffuse solar irradiance for each wavelength. Using aerosol retrieval algorithms by products of the instrument are: the aerosol optical depth, the total column ozone. In addition the combination of the CIMEL and the UVMFR measurements can provide aerosol absorption related parameters.





PSR (Precision Solar Spectrometer)

ARSS is additionally equipped with a PSR (Precision Solar Spectrometer) since December 2015, which measures global horizontal (GHI) and direct normal (DNI) solar Irradiance at the wavelength region of 300-1020nm, with a sampling step of 0.7nm and recording frequency of 1 minute. The instrument has a certified absolute calibration procedure, held at PMOD-WRC (Davos, Switzerland). The high frequency spectral output of GHI can be used for solar energy applications and the calculation of a series of biological weighted effects such as the UV index, the DNA damage, the vitamin D, photosynthetically active radiation, e.t.c. DNI spectral measurements are used for energy applications too and in addition for aerosol optical depth spectral retrievals and water vapor column retrievals.






PANDORA-1S spectral radiometer

Since April 2016, a PANDORA-1S spectral radiometer is installed on the station. This instrument records Direct Solar Irradiance at the region 290-520nm (0.12nm step) with 1min frequency. PANDORA measurements are used to retrieve Total Column O3 and NO2. These retrievals will be available online through the PANDORA network (due to Fall 2016). The system is part of the pandonia network. The planned data products of Pandonia are: 


  • Total and tropospheric ozone (O3) column
  • Total and tropospheric nitrogen dioxide (NO2) column
  • Spectral aerosol optical depth (AOD) in the ultraviolet (>300nm) and visible range
  • The possibility of adding other data products such as sulfur dioxide (SO2, formaldehyde (CH2O), and water vapor (H2O) columns is also explored.



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