基于OMI数据的京津冀及周边地区O_3生成敏感性

Sensitivity analysis of ozone in Beijing-Tianjin-Hebei(BTH) and its surrounding area using OMI satellite remote sensing data

基于O_3生成敏感性的指示剂法,利用OMI对流层柱浓度HCHO/NO_2分析夏季O_3敏感性.O_3控制区空间分布特征分析结果表明,O_3生成受VOCs排放控制的地区主要集中在北京、太原、石家庄等城市中心及工业较发达地区,受NOx排放控制的地区主要集中在北京北部、河北北部、河南大部分地区、山东沿海城市,其他区域为NOx-VOCs协同控制区.分析2005~2016年间京津冀及周边地区O_3生成敏感性的年纪变化特征表明,受VOCs控制的区域面积呈现先增大后减少,受NOx控制的区域呈先减少后增加的趋势.NOx控制区在2011年出现"拐点",NOx控制区面积占研究区域面积的比例达到最低38%.2011年之后NOx排放量下降,NOx控制区面积逐步增大,2016年NOx控制区占比达到65%,VOCs控制区占比降低为3%.分析2005~2016年6~9月份O_3控制区月变化特征发现,相比6~8月份,9月份VOCs控制区增加显著,这是由于6~8月份的NOx控制区转变为NOx-VOCs协同控制区,NOx-VOCs协同控制区向VOCs控制区转变.

The chemical sensitivity of O3 production was assessed using HCHO and NO2 vertical column densities(VCDs)in BTH and its surrounding areas during the period of June to September from 2005~2016,since HCHO/NO2 serves as a proxy for the sensitivity.The results showed that VOCs-limited was mainly concentrated in the central areas in the industrial cities,e.g.Beijing,Taiyuan,Shijiazhuang,etc.NOx-limited regime concentrated in north of Beijing,Hebei Province,most areas of Henan Province,and the coastal cities in Shandong Province.The proportion of VOCs-limited conditions of O3 production increased first and then reduced to 3%in BTH and its surrounding areas in 2016.At the same time,NOx-limited regime showed a trend of increase after the first reduce,and the areas accounted for 65%in 2016.The main reason was that the NOx emission control during“12th five-year plan”was remarkably effective.The results showed VOCs-limited regimes increased significantly in September,with transitions in regimes of NOx-limited into mixed NOx-VOCs-limited,and mixed NOx-VOCs-limited regimes into VOCs-limited regimes compared with June-August.