Surface Trace Gases at a Rural Site between the Megacities of Beijing and Tianjin
Surface Trace Gases at a Rural Site between the Megacities of Beijing and Tianjin
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北京和天津大城市之间农村地区的地表痕量气体
DOI：
10.3878/j.issn.1674-2834.13.0115
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发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
Zhaoze Deng
中科院分区：
文献类型：
--
作者：
Liang Ran;Weili Lin;Pucai Wang;Zhaoze Deng
摘要 由于城市化进程和经济快速增长导致气体污染物排放增加，华北平原（NCP）近年来面临严重的空气质量问题。为了了解NCP的区域空气污染情况，2013年5月至11月在北京和天津这两个大城市之间的农村地区（香河）进行了表面臭氧（O3）、氮氧化物（NOx）和二氧化硫（SO2）的测量。 5 月份臭氧每小时平均值最高，接近 240 ppbv，其次是 6 月和 7 月，约为 160 ppbv。高臭氧事件比2005年更为显着，主要与受污染的NCP腹地城市群至该地点西南方向的空气团有关。对于重要的臭氧前体氮氧化物来说，其浓度在夏季从几个 ppbv 到近 180 ppbv，在秋季超过 400 ppbv。平静条件下氮氧化物高浓度的出现表明香河地区以局地排放为主。 NOx 浓度和 NO/NOx 比率中发现的双峰日模式可能是由局部排放、光化学去除以及表面风速和边界层高度的日变化引起的稀释形成的。值得注意的是，白天出现了明显的 SO2 峰值，并将其归因于上方富含 SO2 的层的向下混合，而从可能的排放源输送来的 SO2 污染的气团，在非供暖（9 月和 10 月）和供暖（11 月）期间有所不同，被认为是造成夜间高浓度的原因。
Abstract The North China Plain (NCP) has recently faced serious air quality problems as a result of enhanced gas pollutant emissions due to the process of urbanization and rapid economic growth. To explore regional air pollution in the NCP, measurements of surface ozone (O3), nitrogen oxides (NOx), and sulfur dioxide (SO2) were carried out from May to November 2013 at a rural site (Xianghe) between the twin megacities of Beijing and Tianjin. The highest hourly ozone average was close to 240 ppbv in May, followed by around 160 ppbv in June and July. High ozone episodes were more notable than in 2005 and were mainly associated with air parcels from the city cluster in the hinterland of the polluted NCP to the southwest of the site. For NOx, an important ozone precursor, the concentrations ranged from several ppbv to nearly 180 ppbv in the summer and over 400 ppbv in the fall. The occurrence of high NOx concentrations under calm conditions indicated that local emissions were dominant in Xianghe. The double-peak diurnal pattern found in NOx concentrations and NO/NOx ratios was probably shaped by local emissions, photochemical removal, and dilution resulting from diurnal variations of surface wind speed and the boundary layer height. A pronounced SO2 daytime peak was noted and attributed to downward mixing from an SO2-rich layer above, while the SO2-polluted air mass transported from possible emission sources, which differed between the non-heating (September and October) and heating (November) periods, was thought to be responsible for night-time high concentrations.
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影响因子：
6.3
作者：
L. Ran;Chunsheng Zhao;Wanyun Xu;M. Han;Xueqiang Lu;S. Han;Weili Lin;Xiaobin Xu;W. Gao
通讯作者：
L. Ran;Chunsheng Zhao;Wanyun Xu;M. Han;Xueqiang Lu;S. Han;Weili Lin;Xiaobin Xu;W. Gao
影响因子：
5.2
作者：
Tao Wang;A. Ding;Jian Gao;Wai-shing Wu
通讯作者：
Tao Wang;A. Ding;Jian Gao;Wai-shing Wu
影响因子：
6.3
作者：
Jiwei Xu;Jianmin Ma;Xiaoling Zhang;Xiaobin Xu;Xiaofeng Xu;Weili Lin;Y. Wang;W. Meng;
通讯作者：
Jiwei Xu;Jianmin Ma;Xiaoling Zhang;Xiaobin Xu;Xiaofeng Xu;Weili Lin;Y. Wang;W. Meng;
中国北京山地烟囱效应的飞机研究
影响因子：
--
作者：
通讯作者：
--
影响因子：
6.9
作者：
Weili Lin;Xiaobin Xu;Zhiqiang Ma;Huarong Zhao;Xiwen Liu;Y. Wang
通讯作者：
Weili Lin;Xiaobin Xu;Zhiqiang Ma;Huarong Zhao;Xiwen Liu;Y. Wang