排序方式: 共有13条查询结果,搜索用时 312 毫秒
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The use of ambient measurements to identify which precursor species limit aerosol nitrate formation 总被引:2,自引:0,他引:2
Blanchard CL Roth PM Tanenbaum SJ Ziman SD Seinfeld JH 《Journal of the Air & Waste Management Association (1995)》2000,50(12):2073-2084
A thermodynamic equilibrium model was used to investigate the response of aerosol NO3 to changes in concentrations of HNO3, NH3, and H2SO4. Over a range of temperatures and relative humidities (RHs), two parameters provided sufficient information for indicating the qualitative response of aerosol NO3. The first was the excess of aerosol NH4+ plus gas-phase NH3 over the sum of HNO3, particulate NO3, and particulate SO4(2-) concentrations. The second was the ratio of particulate to total NO3 concentrations. Computation of these quantities from ambient measurements provides a means to rapidly analyze large numbers of samples and identify cases in which inorganic aerosol NO3 formation is limited by the availability of NH3. Example calculations are presented using data from three field studies. The predictions of the indicator variables and the equilibrium model are compared. 相似文献
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Guo Ping Yu Shaocai Wang Liqiang Li Pengfei Li Zhen Mehmood Khalid Chen Xue Liu Weiping Zhu Yannian Yu Xing Alapaty Kiran Lichtfouse Eric Rosenfeld Daniel Seinfeld John H. 《Environmental Chemistry Letters》2019,17(3):1333-1340
Environmental Chemistry Letters - Climate change is predicted to induce more extreme events such as storms, heat waves, drought and floods. Dust storms are frequently occurring in northern China.... 相似文献
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Charles L. Blanchard Philip M. Roth Shelley J. Tanenbaum Steve D. Ziman John H. Seinfeld 《Journal of the Air & Waste Management Association (1995)》2013,63(12):2073-2084
ABSTRACT A thermodynamic equilibrium model was used to investigate the response of aerosol NO3 to changes in concentrations of HNO3, NH3, and H2SO4. Over a range of temperatures and relative humidities (RHs), two parameters provided sufficient information for indicating the qualitative response of aerosol NO3. The first was the excess of aerosol NH4 + plus gas-phase NH3 over the sum of HNO3, particulate NO3, and particulate SO4 2- concentrations. The second was the ratio of particulate to total NO3 concentrations. Computation of these quantities from ambient measurements provides a means to rapidly analyze large numbers of samples and identify cases in which inorganic aerosol NO3 formation is limited by the availability of NH3. Example calculations are presented using data from three field studies. The predictions of the indicator variables and the equilibrium model are compared. 相似文献
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Aleksandr Kuklin John H. Seinfeld 《Journal of the Air & Waste Management Association (1995)》2013,63(11):899-901
Abstract Combinations of total reactive organic gas (ROG) and nitrogen oxide (NOx) emissions that do not exceed the National Ambient Air Quality Standard (NAAQS) for ozone for the meteorological conditions of the August 26-28, 1987 SCAQS episode, have been determined using the California Institute of Technology (CIT) photochemical air quality model. The sensitivity of these combinations to pollutant boundary conditions is examined. 相似文献
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Pengfei Li Liqiang Wang Ping Guo Shaocai Yu Khalid Mehmood Si Wang Weiping Liu John H. Seinfeld Yang Zhang David C. Wong Kiran Alapaty Jon Pleim Rohit Mathur 《Environmental Chemistry Letters》2017,15(4):709-715
Many regions in China experience air pollution episodes because of the rapid urbanization and industrialization over the past decades. Here we analyzed the effect of emission controls implemented during the G-20 2016 Hangzhou summit on air quality. Emission controls included a forced closure of highly polluting industries, and limiting traffic and construction emissions in the cities and surroundings. Particles with aerodynamic diameter lower than 2.5 μm (PM2.5) and ozone (O3) were measured. We also simulated air quality using a forecast system consisting of the two-way coupled Weather Research and Forecast and Community Multi-scale Air Quality (WRF-CMAQ) model. Results show PM2.5 and ozone levels in Hangzhou during the G-20 Summit were considerably lower than previous to the G-20 Summit. The predicted concentrations of ozone were reduced by 25.4%, whereas the predicted concentrations of PM2.5 were reduced by 56%. 相似文献
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John H. Seinfeld 《Journal of the Air & Waste Management Association (1995)》2013,63(5):616-645
Abstract The field of ozone air quality modeling, or as it is commonly referred to, photochemical air quality modeling, has undergone rapid change in recent years. Improvements in model components, as well as in methods of interpreting model performance, have contributed to this change. Attendant with this rapid change has been a growing need for those developing and using air quality models and policy makers to have a common understanding of the use and role of models in the decision making process. This Critical Review highlights recent advances and continuing problem areas in photochemical air quality modeling. Emphasis is placed on the components and input data for such models, model performance evaluation, and the implications for their use in regulatory decisions. 相似文献