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A comparison of two formula types for calculating long‐wave radiation from the atmosphere
Author(s) -
Aase J. K.,
Idso S. B.
Publication year - 1978
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr014i004p00623
Subject(s) - atmosphere (unit) , radiation , wave equation , flux (metallurgy) , environmental science , radiation flux , meteorology , sky , air temperature , atmospheric sciences , physics , mathematics , mathematical analysis , materials science , optics , metallurgy
Measurements of long‐wave radiation at Sidney, Montana, indicated that both an analytically derived equation and an empirically derived equation for clear‐sky conditions adequately predict the long‐wave radiation flux at that site for screen level air temperatures above 0°C. However, for air temperatures below 0°C the analytical equation always underestimated the true radiation, while the empirical equation just slightly underestimated it, then match it, and then overestimated it, as air temperature decreased from 0° to −37°C. These discrepancies in the below 0°C temperature regime indicate that the equations may need some modification to conform more closely to reality for low‐temperature conditions.