臺灣屬於亞熱帶季風區氣候，氣候溫暖潮溼，年平均雨量達2,452公釐，是世界年平均雨量的2.5倍之多，其主要來源為梅雨和颱風。然而部分月份各地區皆有蒸發量多於降水量的情形，南部地區在乾季期間蒸發尤為旺盛，且因降雨時空分配不均，地形陡峭，河水快速流入海中，故臺灣地區人民易受缺水之苦。
　　在自然界的水循環中，大氣水汽含量雖僅佔全水量的0.001%，但水汽在大氣中變化很大，是天氣變化的主要角色，其存在自然界中的型態有雲、霧、雨、雪、霜、露等。而空氣的溫度更直接影響大氣中的飽和水汽的含量；不同的季節有不同的溫度和濕度，因此有不同的水汽含量，故而影響降水量的多寡。
　　凝露是太陽西落時，物體以輻射降溫的方式達到露點溫度，而在物體表面凝結大氣中的水汽而產生的。由水文平衡觀點來看，夜間所產生的凝露亦為降水量的一種，其對乾旱地區的水資源和農業植物病理之研究具有一定程度之影響。
　　本試驗結果表示，單一逐時的氣象因子與凝露量其實並無法表現其間之關係，因而需同時考慮氣溫和濕度兩因子，如此則可得到良好相關性，其迴歸式可作為凝露評估之經驗公式。試驗期間的理想凝露條件為：平均氣溫高於平均露點溫度約2.5℃以內；平均相對濕度大於85.1％。
　　仁德與美濃地區的凝露機制相似，唯美濃地區因濕度較高，凝露情形較佳；兩地區暖季期間（四月和五月）比寒季期間（一月到三月）有較多的凝露量。本研究推估研究區域內年總凝露量約有19.87mm之多，與年總降雨量和年總蒸發量之百分比分別為0.8％和7.9％，單季較少降雨量和蒸發量的月份中，最大可高達24.7％之多，因此凝露於寒季或乾季時期對水資源的貢獻程度較大。

　　The climate of Taiwan is the subtropical monsoon. It is warm and humid. The annual total average of rainfall is 2,452mm, which is 2.5 times higher than that of the world’s record. However, due to its temporal and spatial asymmetric distribution, and in some months of the year the evapotranspiration is higher than the precipitation; especially in the southern areas. Therefore, people in Taiwan are facing the problems of lack of water.
　　Although vapor in the air within a hydrologic cycle holds only 0.001% in all water resources, it gives a lot of nature phenomenon, such as: cloud, fog, rain, snow, frost, and dew. It is also a primary factor affecting the change of the weather.
　　Dew is the condensation of atmospheric moisture on objects that have radiated sufficient heat to lower the surfacial temperature to below the dew point temperature of the surrounding air. On the hydraulic balance point of view, dew is similar to rainfall. It plays an essential role for studying the water resources in an arid area, as well as the studies on agricultural vegetation pathology.
　　In results, there is no apparent relationship between only single one meteorological factor and dewfall. However, including both temperature and humidity; these two meteorological factors give a very significant relationship among factors. According to the experimental results, the optimal conditions for condensation of dews are the average of temperature is 2.5℃lower than that of dew point, and the average of relative humidity is greater than 85.1%.
　　The mechanism of dew in Jente and Meinung area is similar. However, the humidity of Meinung is higher, such that it has more dew condensation. In these two areas, the dew condensation in the wormer seasons (April and May) is higher than that of colder seasons (January to March). The estimation of annual dewfall is 19.87mm. The dewfall takes 0.8% and 7.9% upon rainfall and evapotranspiration respectively. However, for signal season with less precipitation and evaportranspiraion, dewfall can be as high as 24.7%. Naturally it contributes more important role in the colder season to the aspect of regional water resources.

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