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Short Report

ScienceAsia 10 (1984): 057-062 |doi: 10.2306/scienceasia1513-1874.1984.10.057

 

CALCULATIONS OF LONG - WAVE SPECTRAL ATMOSPHERIC EMISSIVITIES FOR BANGKOK, SONGKHLA AND UBON RATCHATHANEE

 

PIYAWAT BOON-LONG

ABSTRACT: Spectral atmospheric emissivity in the wavelength range 5 - 35 m has been calculated for three cities in Thailand: Bangkok, Songkhla and Ubon Ratchathanee. This is in addition to the work previously published for Chiang Mai (Boonlong, P. (1981) J. Sci.Soc. Thailand 7, 147 - 153). The method used was based on an approximate monochromatic emissivity equation, qnd published upper - air data for the three cities. Results show that the lowest spectral emissivity in the transparency window (8.5 - 12 m) occurs in Feblfuary, ranging from 0.49 at Ubon Ratchathanee to 0.66 at Bangkok. A sample or calculated outward radiation fluxes from four radiators at the three cities is also presented and discussed.

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Department of Mechanical Engineering, Chiang Mai University, Chiang Mai, Thailand

Received 8 August 1983