The long-term impact of transboundary on Taiwan’s ozone using photochemical grid model and indiactors

• Main Authors: An-De Jhang, 張安德
• Other Authors: Ken-Hui Chang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/03496512937068927644

碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 99 === Recently, duo to the fast development in East Asia, emissions of pollutants have gradually increased and it will result in a serious air pollutant problem. Emission sources of pollutants affect air quality not only in local, but also in other regions by long-range transport. Therefore, the assessment of ozone pollution in Taiwan should consider pollutants not only from inside, but also from outside. With the increased emission in nearby countries, the control direction of ozone precursors may change in Taiwan, due to transboundary long-range transport. In order to clarify that, impact of the emission of air pollutants in East Asia on Taiwan''s ozone air quality. This study utilized the Taiwan Air Quality Model (TAQM) to long-term simulate with four months. This study analysis that, impact of the emission in the status quo (2007s) and the future (2020s) in East Asia on the ozone concentration and the control direction of ozone pollution in Taiwan. The four periods of modeling are February, May, August, October, representing winter, spring, summer, autumn, respectively. Using Four months of the simulation results, represent the impact of transboundary transport to Taiwan in 2007s and 2020s. The study also discussed that, new emissions which Economic Zone in West of Taiwan Strait affect Taiwan''s ozone concentration in May and October in the future (2020s) except the whole of East Asia. The impact of transboundary transport in 2007s on the average of daily peak ozone in Taiwan is 15.5 ppb, and the most serious case in 2020s increased by 3.7 ppb. If further calculated exposure days with ozone over 120 ppb, this is equivalent to ozone PSI≧100 days of station, the influence of transboundary transport in 2007 contribution to 72% of days of station in Taiwan, and increased by 47% in 2020s. Using H2O2/HNO3 as a photochemical indicator, analyze impact of transboundary transport on the control species of ozone pollution in Taiwan. The control species of ozone pollution in Taiwan in 2007s are primarily VOCs-limited. If emissions remain unchanged in Taiwan, but other countries continue to grow emissions in East Asia. The control species of ozone pollution in Taiwan in 2020s are still VOCs-limited. However, the increase is more in NOx-limited (26487 km2-d), and the increase is less in VOCs-limited (13770 km2-d). Further statistics change in control direction of ozone pollution for each grid in Taiwan from 2007s to 2020s. Move to the area of NOx-limited is 15% of the total pollution area, and move to the area of VOCs-limited is only 3%. This means that the future with other countries to increase their emissions, through the impact of transboundary transport, NOx control will more important in Taiwan. Future (2020s) Economic Zone in West of Taiwan Strait may be added emissions after completion of construction. Taiwan will increase 0.5 ppb on the average of daily peak ozone, and 3.2% on days of station. Although the effect is only 3.2%, this is only the new emissions of a single region from China (Fujian Province and its vicinity). Therefore, the effect of 3.2% is quite substantial.