隨著科技的發展，帶來了人口的高速成長及集中，產生都市區域快速擴張及土地開發急遽增加的狀況，進而開始對整個生態環境造成巨大的衝擊，而熱島效應便是此衝擊下最為明顯的現象。過往對於熱島現象的研究多是基於大尺度的資料探討，且少涉及於區域環境差異影響的研究。
為了解區域環境差異對於都市氣溫的分佈及熱島現象的呈現之影響，以利於提供往後進行都市規劃及土地開發的參考，本研究經由統合都市現況各環境參數的評估，並參考過往氣象測站架設方式的優缺點，進行台南都會區域的密集氣候數據量測網絡建置，經由對長期且連續的數據資料進行分析，探討環境差異對氣溫分佈的影響。
首先，本研究呈現了研究區域內的熱島強度逐時變化，發現熱島強度於夜間時，涼、熱季的差異高達1度；而於日間時，差異僅約0.2度。此發現對於後續評估不同時段下都市環境對氣溫的影響極為重要。其次，利用溫度中心位變化的呈現，可看出整體區域的氣溫變化趨勢。而整體溫度中心移動路徑的變化，於熱季時呈現了東西狹長且循環位置位於研究區域的較北側；於涼季時則呈現了較方圓且位於研究區域的東南側。此一結果對於往後欲解析影響氣溫分佈的因子，具有相當大的利用價值。最後，區域氣溫的分佈，除受到地理特徵的不同有影響外，配合考量都市環境的差異，進行氣溫變化的分析後，發現在離海距較近的情況下，高開發的都市型態，氣溫高於低開發的都市型態，兩都相差高達1度。這更可證實隨都市開發程度的提升，區域的高溫呈現比例會隨之上升。

Observation of air temperature at street level is essential for elaborating the urban heat island phenomenon and exploring the effect of various urban characteristics on the air temperature distribution. Therefore, this study implements a high density street-level air temperature observation network (HiSAN) in Tainan, Taiwan. For the measurement location, it is determined by various criteria, e.g. urban morphology, building typology, land cover, building energy use, developed levels. Moreover, since the urban built environment is a classification of urban land use corresponding its thermal environment characteristic, the inhomogeneous built environment of the measurement point will be also considered. Finally, totally 100 points is selected in metropolitan area of the Tainan city. These points covered in 21 km in north-south direction and 24 km in east-west direction. The average distance between two nearest points are 1.9 km and is lower in core area as 0.8 km. There are 19 points for the greenery area and 18 points classified middle high residential area. The initial results indicate a 4.2° C heat island intensity in night time and 3.6° C in day time. Although the results indicated urban develop features are related to air temperature distribution, a follow-up analysis on each urban morphology parameter, e.g. sky view factor, material of building and pavement, energy use of buildings, green ratio and imperviousness, revealing better explanation on the phenomenon. For future analysis, the spatial and temporal distribution of air temperature had been studied, and the effect of land use, energy consumption will be also discussed based on the data. The results are useful for the policy maker of urban planning through the urban design review process, and are benefit for the architects during the design scheme, site planning, and material applied.

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