科研进展
科研进展
您的当前位置:首页 > 科研成果 > 科研进展

Surface trace gases at a rural site between the megacities of Beijing and Tianjin

发布人:ljh  |  来自:本站  |  发布时间:2014-05-20 18:38:20  |  点击次数:1180
全文下载链接:http://lageo.iap.ac.cn/uploads/140521023927gercpwl0oumc.pdf

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.

  • 卫星数据中心
  • |
  • 大气物理所
  • |
  • 北京朝阳区华严里40号, 100029 电话:010-82995065,82995091 传真:010-82995073
    版权所有:中国科学院大气物理研究所中层大气和全球环境探测重点实验室
    京ICP备1234556号