The Transmittance to Direct Irradiance due to Absorption by Precipitable Water Vapor in the Atmosphere

Sayan Phokate; Nitiphat Pisutthipong

doi:10.4028/www.scientific.net/AMR.979.7

Paper Titles

Preface and Committees

Micro Plasma Source Design Using WGMs a PANDA Ring
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The Transmittance to Direct Irradiance due to Absorption by Precipitable Water Vapor in the Atmosphere
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Drying Pineapple Using a Mix Mode Solar Dryer
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Detection of Pesticide Residues in Vegetables and Fruits Using Piezoelectric Crystal Biosensor
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Physical Parameters for a Contact Binary AY Aquarius
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Analysis of Neutron Flux Measurement in Thai Research Reactor-1/Modification 1 Using the Monte Carlo Method
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A Fabrication of Galvanic Cell from Pineapple Peel Residue in Agricultural Industries
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Quantum Field Theory Viewpoint of Refractive Index
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 979The Transmittance to Direct Irradiance due to...

The Transmittance to Direct Irradiance due to Absorption by Precipitable Water Vapor in the Atmosphere

Abstract:

This research aims to calculate the transmittance to direct irradiance due to absorption by precipitable water vapor in the atmosphere of Thailand, estimation of the absorptance by water vapor in the atmosphere and calculate the precipitable water vapor in the atmosphere. The precipitable water vapor in the atmosphere was calculated from upper air checking data relative humidity and temperature. The data were collected at four meteorological monitoring station located in Chiang Mai, Ubon Ratchathani, Bangkok and Songkhla during the years 1991-2010. The figures for precipitable water vapor obtained from this investigation were used to formulate a mathematical model relating to the precipitable water from four stations with surface climatological data, relative humidity and temperature at the same stations. The result showed that the relationship has a relatively high level of reliability. The precipitable water vapor obtained from upper air nearly is equal to the value from the model. The difference in the Root Mean Square Error (RMSE) is equal to 0.250 cm. Then, the researcher used a model to calculate the amount of precipitable water vapor at 85 meteorology stations nationwide. The result showed that the precipitable water vapor was less in the dry (November to March) and relative high in the rainy season (April-October). The average per year was found to be 4.559 cm. When analyzing the solar radiation absorption by water vapor in the atmosphere, found that the absorption is more or less depending on the precipitable water vapor in the atmosphere, which has an average annual as 15.53 percent. The transmittance to direct irradiance due to absorption average per year was found to be 84.51 percent.

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Periodical:

Advanced Materials Research (Volume 979)

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7-10

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https://doi.org/10.4028/www.scientific.net/AMR.979.7

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Online since:

June 2014

Authors:

Sayan Phokate*, Nitiphat Pisutthipong

Keywords:

Absorption, Direct Irradiance, Precipitable Water Vapor, Solar Radiation, Transmittance

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