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【环境讲坛70期】Source and Source-region Contributions to Summer Time Ozone in China

来源:    发布时间:2018-05-03    点击次数:

报告人:    应琦

报告时间:53日(星期四)15:00

报告地点:二楼报告厅

联系人:     

 

报告摘要:
While fine particulate matter (PM2.5) has been the pollutant of focus in recent years in China, O3 concentrations in many urban areas are high with increasing trends and are projected to continue to rise. Thus, as O3 pollution gradually becomes more serious, identification and quantification of the sources that contributes to O3 formation is essential in formulating cost-effective emission control policies. Contributions of industries, power plants, residential, transportation, open burning, and biogenic sectors to summertime ozone (O3) in China in August 2013 are quantified using an improved O3 source apportionment method implemented in a source-oriented Community Multiscale Air Quality (CMAQ) model. The new O3 source apportionment method attributes in-situ O3 formed in each time step to nitrogen oxides (NOx) and volatile organic compounds (VOCs) with a new attribution scheme that considers NOx-VOC-O3 formation sensitivity in NOx-limited, transition, and VOC-limited regimes based on the value of a regime indicator R. Industries, transportation, power plants and biogenic sources are the major emission sectors to O3. The Beijing-Tianjin-Hebei (BTH) region has an area-averaged 8-hr O3 of 75 ppb in August 2013 and about half is non-background. Contributions of industries, transportation, power and biogenic sources to non-background O3 are 37%, 22%, 13% and 23%, respectively. The new three-regime approach predicts up to 15 ppb higher NOx contributions to 8-hr O3 in in the North China Plain, the Yangtze River Delta and the Pearl River Delta than the traditional approach, with relative differences as high as 100%, which could have significant policy implications for air pollution emission controls.  In addition to source contributions, the new source apportionment technique is also applied to study source-region contributions to ozone in Beijing and Shanghai. In Beijing, both local and regional sources, mostly from south Hebei province, have significant contributions to 8-hr ozone.  In Shanghai, however, most of the non-background ozone is due to local emissions.

 

报告人简介:
    应琦,男,汉族,
19783月出生于上海市。20007月获得清华大学环境工程学士学位。20048月获得加州大学戴维斯分校环境工程博士学位。2005-2007年在加州环保局空气质量管理局(California Air Resources Board)任空气污染专家。从20078月起在美国德克萨斯州A&M大学土木工程系任助理教授,副教授(Tenured)。长期从事环境科学与工程领域教学和科研工作,目前主要研究方向为大气污染源解析、光化学烟雾反应机制、二次气溶胶机理、排放清单以及城市和区域多尺度大气污染模式。已发表SCI论文84, 其中通讯作者和第一作者论文50篇。文章总引用次数2300余次,H-index=29。开设本科生课程三门(环境科学与工程引论,数值计算方法,自然环境系统模型分析)研究生课程三门(环境工程中的物理过程,大气污染工程,空气质量数值模拟)。中国科学院大气物理所SCI论文分析2011-2015年“气象与大气物理”领域高影响力科学家排行榜第14位,海外华人科学家排行榜第4位。

 

 

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