The Relationship Between the Change of Microclimate and Sector Visibility in Taipei Metropolis
The objective of this research is to analyze the correlation between microclimate variation and sector visibility in Taipei Metropolis. The effect of weather pattern on visibility via observation was studied through surveyed data. Using intensive observation results from the top attic of the Taipei County Government Building, analysis was performed on each visibility profile with respect to various meteorological factors and air pollution factors. Meteorological factors included the mixing high, the ventilation index, the atmospheric stability, the wind direction, the wind speed, the temperature, and the relative humidity. Correlation analysis was performed for microclimate variation and sector visibility for the summer and winter intensive observation periods.
To the Song-Shan (east-northeast) direction, high visibility was present with sunshine in the summer. Whenever the solar intensity weakens, the lift of moisture content in the air would cause the relative humidity to increase and lower the visibility. The visibility was generally lower in the winter when extra moisture was brought in by the NE monsoon. To the Dai-Sui (north) direction, the visibility was low all year due to moisture content of the local sea-land breeze. To the Hsin-Tien (east-southeast) direction, low visibility existed due to accumulation of suspended particulates within local circulation of the valley-mountain wind.