Variability of the Linke and Unsworth-Monteith turbidity parameters in Athens, Greece |
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| Authors: | H D Kambezidis A K Fotiadi B D Katsoulis |
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| Institution: | (1) Now with the Laboratory of Aerology, UMR UPS/CNRS 5560, Observatory of Midi-Pyrenees, 14 Edouard Belin Ave., F-31480 Toulouse, France (e-mail: fota@aero.obs-mip.fr), FR;(2) Atmospheric Research Team, Institute of Environmental Research and Sustainable Development, National Observatory of Athens, GR-11810 Athens, Greece, GR;(3) Laboratory of Meteorology, Dept. of Physics, University of Ioannina, GR-45110 Ioannina, Greece, GR |
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| Abstract: | Summary This work studies the variability of the Linke (T
L
) and Unsworth-Monteith (T
U
) turbidity parameters in the urban atmosphere of Athens. Beam irradiance observations performed at the Actinometric Station
of the National Observatory of Athens are used in the period 1975–1995. This study examines (i) the inter-annual variation
of T
L
and T
U
, (ii) their mean seasonal variability, (iii) their monthly average variation, and (iv) their mean daily variation. Also,
for various air-mass origins, the mean seasonal variations of T
L
and T
U
are given. The frequency of occurrence of the parameters in various ranges is also shown. An innovative interpretation of
the impact of the Saharan dust on the radiative properties in the atmosphere of Athens is attempted.
Received May 19, 2000 Revised October 17, 2000 |
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| Keywords: | |
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