都市氣源系模式（簡稱UAM）為三維光化格點模式，係近二十年來在美國被廣泛運用以計算光化污染物於大氣物理化學過程中濃度變化之光化污染擴散模式之一，本研究係針對台灣北部地區高臭氧濃度事件，探討氣源系模式對該個案臭氧濃度時空分布變化之模擬能力。經實際案例模擬結果，其預測值與觀測值有相同時間序列趨勢，然運用鄰近單一格點法，比較預測值與實際測站值，則顯示模式整體表現為高估，於各測站點除臨近地形變化較大之背風面點以外，其平均相對誤差值在30%左右，但兩者變化趨勢一致且每日之單高峰亦相近。因而在恰當選取時間及空間因子之條件下，UAM模式對空氣品質劣化實際案件之模擬，具有相當能力。
Urban Airshed Model (UAM) is a widely used three dimensionals photochemical air quality model in United States in the least 20 years. Case studies proved that UAM calculated the air pollutant concentration change under certain physical and chemical processes by numerical solution are very successful.In this paper, we select an ozone episode in Northern Taiwan and use UAM to simulate the spatial and temporal variations of ozone and to learn the suitableness of UAM in simulating the regional problem in Taiwan.
It is found that the time series of the predicted and observed values have the same tendency. In the one-cell search evaluation, the predicted values are somewhat higher than the observed ones. In most area, except to the leeside of terrain,even though the relative error between the calculated and the observed values are up to a quarter or so,the trends of both values are very close and all have”one peak” I one day results. This suggest ,that the UAM is a possible tool for simulating the regional pollution event in northern Taiwan.
