Characterizations of ozone and related compounds under the influence of maritime and continental winds at a coastal site in the Yangtze Delta, nearby Shanghai
Characterizations of ozone and related compounds under the influence of maritime and continental winds at a coastal site in the Yangtze Delta, nearby Shanghai
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DOI：
10.1016/j.atmosres.2010.03.004
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发表时间：
2010-07
影响因子：
5.5
通讯作者：
Wenpo Shan;Jianda Zhang;Zhixin Huang;L. You
中科院分区：
文献类型：
--
作者：
Wenpo Shan;Jianda Zhang;Zhixin Huang;L. You
本文对上海附近长江三角洲沿海地区海洋风（MW）和大陆风（CW）期间地面臭氧及相关化合物（NO、NO2和CO）浓度的一些显著特征进行了研究和讨论。MW的频率在春、夏两季较高，秋、冬两季较低。各季节中，微波期间的臭氧浓度均明显高于CW期间，而主要污染物浓度则相反。在CW期间，可能存在由上海市区输送来的相对新鲜的初级污染物引起的现场臭氧降低过程。相反，MW期间的污染物更老化，因此臭氧抑制过程较弱，臭氧水平较高。由于缺乏新鲜NO，臭氧日最大值滞后，清晨臭氧最小值在MW期间被掩盖。CW期间臭氧浓度呈现明显的“周末效应”，MW期间臭氧浓度呈现明显的反“周末效应”。与上海市区一样，CW期间的“周末效应”主要与“VOCs限制”和NO2/NO比值的变化有关。MW期间的臭氧反“周末效应”可能与周末的高NOx浓度有关，这是由于CW期间从城市地区携带的污染物在工作日的再循环造成的。
In this study, some distinct characteristics of surface ozone and related compound (NO, NO2, and CO) levels during maritime winds (MW) and continental winds (CW) at a coastal site in the Yangtze Delta, nearby Shanghai, were presented and discussed. The frequency of MW was higher in spring and summer and lower in autumn and winter. The ozone level during MW was much higher than those during CW in each season, while the primary pollutant levels presented the opposite result. There may be ozone depression processes during CW at the site caused by relatively fresh primary pollutants, which are transported from urban Shanghai. In contrast, pollutants during MW were more aged, so the ozone depression processes were weak and the ozone level was high. Due to the lack of fresh NO, the daily ozone maximum was lagged, and the early morning ozone minimum was obscured during MW. Ozone concentrations during CW presented evident “weekend effect”, while the concentrations during MW showed obvious anti-“weekend effect”. Just like in urban Shanghai, “weekend effect” during CW in the site is mainly associated with “VOCs-limited” and the change of NO2/NO ratio. The ozone anti-“weekend effect” during MW might be associated with the high NOxconcentrations in weekend, which were caused by the recirculation of the pollutants carried over in weekdays from urban areas during CW.