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Day‐time long‐wave radiation from the sky
Author(s) -
Paltridge G. W.
Publication year - 1970
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709641007
Subject(s) - cloud cover , environmental science , meteorology , diurnal temperature variation , atmospheric sciences , radiation , climatology , sky , humidity , time of day , physics , geology , optics , cloud computing , zoology , computer science , operating system , biology
Six months of records of the hemispheric flux F of long‐wave radiation at Aspendale, Victoria, are analysed. A day‐time correction to Swinbank's formula for the radiation from clear skies is established, and this correction is probably applicable also to other more accurate formulae which include a term dependent on screen level humidity. It varies with time of day and season, but is of the order of − 3 mW cm −2 on summer afternoons. The correction is applied to all‐weather data, and at Aspendale the average long‐wave radiation at the ground due to clouds is found to be 0.6 mW cm −2 /tenth of cloud cover. The mean value of F under cloudy skies is sensibly constant throughout the day, and is not greatly influenced by the diurnal variation of screen temperature.