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Weekday/weekend difference of ozone and its precursors in urban areas of Japan, focusing on nitrogen oxides and hydrocarbons

机译：日本城市地区臭氧及其前驱物的工作日/周末差异，重点是氮氧化物和碳氢化合物

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摘要

This paper analyzes the weekday-weekend differences of ozone, NO_x ( = NO and NO_2) and non-methane hydrocarbons (NMHCs) in Tokyo and Osaka, Japan, from 2001 to 2004, in order to investigate the ozone weekend effect (OWE). Data were measured at 24 and 23 general air monitoring stations in Tokyo and Osaka, respectively. We focused on NO_x and NMHCs to investigate the causes of OWE. Specifically, we examined weekday/weekend differences in the titration of O_3 by NO and the photochemical ozone production. Weekend ozone concentrations were confirmed to be greater than those of weekdays during most periods in both Tokyo and Osaka, although precursor concentrations were higher on weekdays. Weekday ozone concentrations in Tokyo (other than during 2003) and Osaka decreased due to the reaction of O_3 with NO, resulting in higher ozone but lower O_x (the sum of O_3 and NO_2) concentrations on weekends than on weekends. In 2003 in Tokyo, however, the effect of the photochemical ozone production on weekends was larger than on weekdays, as determined by the comparison of ozone concentration increase versus NMHCs/NO_x ratio and O_x between weekdays and the weekend. The weekend NMHCs/NO_x ratio would be in the boundary area between volatile organic compound (VOC)-and NO_x-limited regime, so it is considered that the difference between 2003 and the other periods in Tokyo might be due to a change in precursor limitation.
机译：本文分析了2001年至2004年日本东京和大阪的臭氧，NO_x（分别为NO和NO_2）和非甲烷碳氢化合物（NMHC）的工作日－周末差异，以研究臭氧周末效应（OWE）。分别在东京和大阪的24个和23个一般空气监测站测量了数据。我们专注于NO_x和NMHC，以调查OWE的原因。具体而言，我们研究了工作日/周末在NO滴定O_3和光化学臭氧产生方面的差异。在东京和大阪，大部分时期的周末臭氧浓度都被确认为高于工作日的臭氧浓度，尽管前一天的臭氧浓度较高。由于O_3与NO的反应，东京（2003年除外）和大阪的工作日臭氧浓度降低，导致周末的臭氧含量较高，但O_x（O_3和NO_2之和）的浓度低于周末。然而，2003年东京的光化学臭氧生产量对周末的影响大于平日，这是通过比较工作日和周末之间臭氧浓度增加与NMHCs / NO_x比率和O_x的比较确定的。周末的NMHCs / NO_x比值将处于挥发性有机化合物（VOC）和NO_x限制制度之间的边界区域，因此可以认为，2003年与东京其他时期的差异可能是由于前体限制因素的变化。

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