摘要
为确定石家庄东部郊区交通干线附近O_(3)生成光化学敏感性,利用2019年1月1日—2020年10月31日在线观测的NO_(x)、NOy和O_(3)等数据计算并分析了O_(3)生成效率(OPE)及O_(3)光化学敏感性的NO_(x)临界浓度.结果表明:①交通干线附近O_(3)光化学敏感性存在季节差异,春季主要受VOCs控制,整体OPE为2.6±0.3,夏、秋季节主要受NO_(x)与VOCs协同控制,整体OPE分别为5.3±0.4和5.1±0.8;②NO_(x)体积分数>11×10^(-9)时,O_(3)生成主要为VOCs控制;NO_(x)体积分数介于6×10^(-9)~11×10^(-9)时,O_(3)生成主要受VOCs与NO_(x)协同控制;NO_(x)体积分数<6×10^(-9)时,O_(3)生成主要为NO_(x)控制;③O_(3)生成敏感性存在日变化特征,10:00之前O_(3)生成主要受VOCs控制,10:00—11:00是O_(3)生成由VOCs控制转变为VOCs和NO_(x)协同控制的过渡时段,12:00之后O_(3)生成主要由VOCs和NO_(x)协同控制,且午后14:00—16:00之间NO_(x)对O_(3)控制比例凸显.因此,石家庄O_(3)治理不但要重视NO_(x)与VOCs排放源的协同管控,尤其午后还需要对NO_(x)排放源进行分时段精细化管控.
In order to study the formation sensitivity of ozone at the Traffic Trunk Roads site located in the eastern suburbs of Shijiazhuang,ozone production efficiency(OPE)and critical NO_(x) concentration was calculated and analyzed using the on-line data from 1 January 2019 to 31 October 2020.The observed results were listed following:①The formation sensitivity of ozone was of significantly seasonal variation.OPE was 5.3±0.4 and 5.1±0.8 in summer and autumn,respectively,controlled by synergistic effect of NO_(x) and VOCs.While the OPE in spring was 2.6±0.3,and mainly controlled by VOCs.②The NO_(x) volume fraction was less than 6×10^(-9),between 6×10^(-9) and 11×10^(-9),and greater than 11×10^(-9) correspond to that the ozone formation limited by NO_(x),NO_(x)⁃VOCs and VOCs,respectively.③The ozone formation sensitivity was daily variant,controlled by the NO_(x) critical concentration.The transformation period when the ozone formation gradually transferred from being VOCs⁃sensitive to NO_(x)⁃VOCs⁃sensitive was from 10:00 to 11:00.The ozone formation was VOCs⁃sensitive before 10:00,and was limited by NO_(x)⁃VOCs after 12:00,and the ozone formation sensitivity to NO_(x) increased in the afternoon.Thus,the ozone management in Shijiazhuang should not only pay attention to the coordinated control of NO_(x) and VOCs emission sources,especially in the afternoon,but also need to carry out time⁃divided fine control of NO_(x) emission sources.
作者
张晓
鲍晓磊
赵江伟
贺军亮
ZHANG Xiao;BAO Xiaolei;ZHAO Jiangwei;HE Junliang(College of Resources and Environment,Shijiazhuang University,Shijiazhuang 050035;Hebei Provincial Academy of Ecological Environmental Science,Shijiazhuang 050037;Hebei Ecological Environment Monitoring Center,Shijiazhuang 050037)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第12期5047-5054,共8页
Acta Scientiae Circumstantiae
基金
河北省青年科学基金项目(No.D2019106042)
河北省自然科学基金面上项目(No.D2021106002)。
