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首页> 外文期刊>Atmospheric environment >Diurnal and seasonal cycles of ozone precursors observed from continuous measurement at an urban site in Taiwan
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Diurnal and seasonal cycles of ozone precursors observed from continuous measurement at an urban site in Taiwan

机译：通过台湾城市地区的连续测量观察到的臭氧前体的昼​​夜和季节周期

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Hourly measurement of 56 ozone precursors was conducted by a monitoring station located in a metropolitan area in central Taiwan. After nearly a year of continuous operation at this urban site, both diurnal and seasonal cycles of nonmethane hydrocarbons (NMHCs) were clearly observed, which was caused by the interplay between source, chemical loss, and meteorology. Selected species representing three different types of major sources namely the household fuel leakage, vehicular exhaust and gasoline evaporation, as well as biogenic emissions exhibit dramatic diurnal or seasonal cycles with each displaying its own unique characteristics. Ethane and propane, largely originated from leakage of natural gas or liquefied petroleum gases (LPG), showed concentrations elevating throughout the night and early morning, but began to decrease towards noon as the nocturnal temperature inversion elevated. Because of the lower chemical reactivity and somewhat more constant emissions than other measured target compounds, their diurnal cycles were presumably the direct reflection of the mixing height over the metropolitan area. For compounds originating from vehicular plus evaporative emissions such as benzene, which accounts for most of the monitored compounds, their diurnal cycles were also largely controlled by the variation in the height of temperature inversion. Of all the 56 species monitored, isoprene, an abundant biogenic species largely released by plants, showed distinct diurnal and seasonal cycles different from the other measured NMHCs. Its concentration usually peaked at noon in summer and fall when temperature and solar radiation reached their maximum level, demonstrating the close relationship of isoprene with photosynthesis. Seasonal variation was also clearly observed for the other NMHCs quantified. With the exception of isoprene, most species show higher average concentration in winter and lower in summer with the fall values being the intermediate, which presumably is caused by both the seasonal variation in HO abundance and the height of the temperature inversion.
机译：位于台湾中部大都市区的一个监测站每小时对56种臭氧前体进行测量。在该城市站点连续运行了将近一年后，清楚地观察到非甲烷碳氢化合物（NMHC）的昼夜循环和季节性循环，这是由源，化学损失和气象之间的相互作用引起的。选定的代表三种不同主要来源的物种，即家庭燃料泄漏，车辆尾气和汽油蒸发以及生物成因排放，表现出明显的昼夜或季节循环，每种循环都有其独特的特征。乙烷和丙烷主要来自天然气或液化石油气（LPG）的泄漏，在整个夜晚和清晨浓度都升高，但随着夜间温度反演的升高，其浓度逐渐降低至正午。由于其化学反应性较低，且排放量比其他测得的目标化合物要稳定一些，因此其昼夜周期大概是大都市地区混合高度的直接反映。对于源于汽车和蒸发排放物的化合物（例如苯），这些化合物占大多数监测化合物，它们的日循环也很大程度上受温度反转高度变化的控制。在所有受监测的56种物种中，异戊二烯是植物释放的大量生物物种，其昼夜和季节周期与其他测得的NMHC不同。它的浓度通常在夏季的中午达到高峰，而在温度和太阳辐射达到最大水平时下降，表明异戊二烯与光合作用的密切关系。对于其他定量的NMHC，也清楚地观察到季节变化。除异戊二烯外，大多数物种在冬季均表现出较高的平均浓度，而在夏季则表现出较低的平均值，其下降值为中间值，这可能是由于HO丰度的季节性变化和温度反转高度引起的。

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