ScienceAsia 2 (1976): 160-167 |doi: 10.2306/scienceasia1513-1874.1976.02.160

ATMOSPHERIC RADIATION AND SKY TEMPERATURES IN THAILAND

R.H.B. EXELL and MOHAMMAD ISSA KALWAR*

Summary: The downward longwave atmospheric radiation flux at Chiang Mai, Ubon, Bangkok, and Songkhla at 07:00 h daily during 1969 has been calculated from surface air temperatures using Swinbank's empirical formula with a correction for cloudiness depending on cloud amounts and heights. Mean values of the radiation flux, and the frequency distribulion of the fluxes, in eight 1 1/2 month periods of the year are given. The mean fluxes, lie in the range. 349 to 415 Wm^-2. Mean effective sky temperatures, at which a blackbody emits the same flux, lie in the range 6.9 to 19.3 ^oC. The results are consistent with measured values of atmospheric radiation under similar conditions in India.

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Division of Community and Regional Development, Asian Institute of Technology, P.D., Box 2754, Bangkok, Thailand

Received 28 September 1976