Wang Ying, Li Ling-Jun, Liu Yang
College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.
Huan Jing Ke Xue. 2012 Nov;33(11):3685-92.
The interannual variability of NO2 levels in two major Chinese economic regions, the Beijing-Tianjin-Hebei (BTH) economic circle and the Yangtze River Delta (YRD), were studied using multiple years of OMI-retrieved NO2 columns and ground measurements. The NO2 columns were comparable in the two regions, which were - 50% higher than the BTH and YRD regional background and two times higher than the Asia-Europe continental background. Satellite data showed that the high NO2 regions scattered around Beijing and Shanghai in summer, and the coverage of high NO2 regions increased in spring and merged in winter, affecting the entire eastern China. Ground level NO2 concentrations in the urban centers of Beijing and Shanghai were also comparable, which were - 10 times greater than the regional background and 1 000 times higher than the Asia-Europe continental background. As industries gradually migrated out of the urban centers, the NO2 concentrations in Beijing and Shanghai decreased, but the regional background NO2 concentration in BTH and YRD increased. It reflected in part the impact of NO2 emission reductions related to fossil fuel combustion as a result of air quality control measures in BTH and YRD. NO2 levels during the Beijing 2008 Olympic Games and the Shanghai World Expo 2010 decreased temporarily, but bounced back quickly afterwards, indicating that sustainable air quality improvement can only be achieved through long-term regional efforts.
利用多年的OMI反演二氧化氮柱浓度数据和地面测量数据，研究了中国两个主要经济区——京津冀（BTH）经济圈和长江三角洲（YRD）二氧化氮水平的年际变化。两个地区的二氧化氮柱浓度具有可比性，比京津冀和长三角地区背景值高50%，比亚欧大陆背景值高两倍。卫星数据显示，夏季高二氧化氮区域分散在北京和上海周围，春季高二氧化氮区域覆盖范围扩大，冬季合并，影响了中国东部地区。北京和上海城市中心的地面二氧化氮浓度也具有可比性，比区域背景值高10倍，比亚欧大陆背景值高1000倍。随着产业逐渐从城市中心迁出，北京和上海的二氧化氮浓度下降，但京津冀和长三角地区的区域背景二氧化氮浓度上升。这部分反映了京津冀和长三角地区空气质量控制措施导致的化石燃料燃烧相关二氧化氮减排的影响。2008年北京奥运会和2010年上海世博会期间二氧化氮水平暂时下降，但之后迅速反弹，表明只有通过长期的区域努力才能实现空气质量的持续改善。
