Diurnal Variation of Visibility with its related Meteorological Factors in Thailand

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Ladda Tasaso
Pakpong Pochanart


Visibility is an important factor in our daily life and visibility is considered a standard meteorological parameter. The objective was to study diurnal variation of visibility in Thailand and its related meteorological factors. A research study of secondary data consisting of visibility data, cloud data, relative humidity data and rainfall data for a weather 3 hours for 10 years (2009 - 2018) of 43 stations (from all regions in Thailand). To study the diurnal variation and analyze the correlation by using the rescaling (min-max normalization) analysis of visibility and meteorological factors. The results revealed that the diurnal variation and diurnal correlation of visibility and meteorological factors were consistent. Relative humidity has the greatest impact on changes in visibility diurnal variation. Relative humidity greater than 90 percent, except for the Southern (West Coast) is 66.65 percent and this results in low visibility because of the 24-hour variations of the relative humidity and light scattering of aerosols depends on ambient relative humidity since hygroscopic particles absorb significant water at high relative humidity. The factor affecting relative humidity and cloud was air temperature, diurnal variation of pressure, physical characteristics of measurement area and measurement time.

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