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The turbidity parameters in Athens

Die Trübungsparameter in Athen

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Summary

In this paper Ångström's turbidity coefficient β0, wave-length exponent α0 and the decadic turbidity coefficientB after Schüepp have been computed in Athens from pyrheliometric measurements of direct solar radiation for the whole spectrum and of specified spectral regions using Schott filters for the period 1963–1972. Turbidity coefficient β0 shows an annual variation with low values in winter and high values in spring. The wavelength exponent α0 shows a similar but opposite in sense variation. The decadic trubidity coefficientB is low in winter and attains the highest values in late spring and summer. In order to show the diurnal variation of the turbidity parameters this are given for each of the observation hours 0820, 1120, 1420 and 1720. The annual and diurnal variations of the turbidity parameters are discussed in reference to their relation with seasonal changes of synoptic weather situations, to the prevailing winds and the different air masses.

Zusammenfassung

Aus den in Athen von 1963 bis 1972 durchgeführten Pyrheliometermessungen der direkten Sonnenstrahlung im Gesamtspektrum und in speziellen Spektralbereichen werden der Wellenlängenexponent α0 und der Trübungskoeffizient β0 nach Ångström sowie der dekadische TrübungskoeffizientB nach Schüepp berechnet. Im Jahresgang weist25-7 niedrige Werte im Winter und hohe Werte im Frühling auf, α0 zeigt einen dazu inversen Jahresgang undB ist im Winter niedriger und am höchsten im Spätfrühling und im Sommer. Zur Beurteilung des Tagesganges der Trübungsparameter werden diese auch für die Beobachtungstermine 8h20, 11h20, 14h20 und 17h20 gesondert angegeben. Jahres-und Tagesgang der Trübungsparameter werden in ihrem Zusammenhang mit den jahreszeitlichen Änderungen der synoptischen Wetterlagen, der vorherrschenden Winde und der verschiedenen Luftmassen diskutiert und zu erklären versucht.

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  1. John D. Karalis

    Present address: Meteorological Institute, University of Athens, 33, Hippocratous Street, (144), Athens, Greece

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    Karalis, J.D. The turbidity parameters in Athens. Arch. Met. Geoph. Biokl. B. 24, 25–34 (1976). https://doi.org/10.1007/BF02243382

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