Summary
A comparison between two global solar radiation- and two net longwave radiation flux formulas applied to the calculation of the net radiation flux was made. The differences between the two global solar radiation formulas were fairly small but the ratio of the two net longwave radiation formulas varied from approximately 1.21 under cloudless conditions to 0.25 under completely overcast conditions. The calculation of the net radiation flux was primarily influenced by the calculation of the global solar radiation flux under cloudless conditions, but under overcast conditions it was largely influenced by the calculation of the net longwave radiation flux. The net radiation flux could be predicted successfully only when locally determined constants were used in the equation to calculate the global solar radiation flux and when a cloud adjustment factor was included in the net longwave radiation formulas. Evidence from the literature also indicated that, at least in humid climates, a cloud correction factor is required for the successful calculation of the net longwave radiation flux.
Zusammenfassung
Es wurde ein Vergleich der Anwendung von je zwei Formeln für die globale Sonnenstrahlung und für den langwelligen Strahlungsbilanzstrom auf die Berechnung des gesamten Strahlungsbilanzstromes angestellt. Der Unterschied zwischen den beiden formeln für die globale Sonnenstrahlung war gering. Das Verhältnis zwischen den beiden langwelligen Strahlungsbilanzgleichungen variierte jedoch zwischen ungefähr 1.21 unter wolkenfreien Bedingungen und 0.25 unter völlig bedeckten Verhältnissen. Die Berechnung der gesamten Strahlungsbilanz wurde hauptsächlich von der Berechnung der globalen Sonnenstrahlung unter wolkenfreien Bedingungen beeinflußt, während unter bedeckten Verhältnissen hauptsächlich die Berechnung der langwelligen Strahlungsbilanz maßgeblich war. Die Gesamtstrahlungsbilanz konnte nur dann erfolgreich vorhergesagt werden, wenn in der Gleichung für die globale Sonnenstrahlung lokal bestimmte Konstanten verwendet wurden und wenn ein Korrekturfaktor für Bewölkung in die langwellige Strahlungsbilanzgleichung aufgenommen wurde. Aus der einschlägigen Literatur geht ebenfalls hervor, daß zumindest in feuchten Klimaten ein Wolkenkorrekturfaktor für die erfolgreiche Berechnung der langwelligen Strahlungsbilanz erforderlich ist.
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de Jong, R., Shaykewich, C.F. & Reimer, A. The calculation of the net radiation flux. Arch. Met. Geoph. Biokl. B. 28, 353–363 (1980). https://doi.org/10.1007/BF02352272
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DOI: https://doi.org/10.1007/BF02352272