scholarly journals Top-down estimate of methane emissions in California using a mesoscale inverse modeling technique: The South Coast Air Basin

2015 ◽  
Vol 120 (13) ◽  
pp. 6698-6711 ◽  
Author(s):  
Yu Yan Cui ◽  
Jerome Brioude ◽  
Stuart A. McKeen ◽  
Wayne M. Angevine ◽  
Si-Wan Kim ◽  
...  
Keyword(s):  
Inverse Modeling ◽  
Methane Emissions ◽  
South Coast ◽  
Modeling Technique ◽  
The South ◽  
Top Down ◽  
South Coast Air Basin

scholarly journals Top-down estimate of methane emissions in California using a mesoscale inverse modeling technique: The San Joaquin Valley

2017 ◽  
Vol 122 (6) ◽  
pp. 3686-3699 ◽  
Author(s):  
Yu Yan Cui ◽  
Jerome Brioude ◽  
Wayne M. Angevine ◽  
Jeff Peischl ◽  
Stuart A. McKeen ◽  
...  
Keyword(s):  
Inverse Modeling ◽  
Methane Emissions ◽  
San Joaquin Valley ◽  
Modeling Technique ◽  
Top Down

scholarly journals Contribution of Water to Particulate Mass in the South Coast Air Basin

1995 ◽  
Vol 22 (1) ◽  
pp. 111-123 ◽  
Author(s):  
Zhaoyue Meng ◽  
John H. Seinfeld ◽  
Pradeep Saxena ◽  
Yong Pyo Kim
Keyword(s):  
South Coast ◽  
The South ◽  
Particulate Mass ◽  
South Coast Air Basin

scholarly journals Nitrate Artifacts during PM25 Sampling in the South Coast Air Basin of California

1999 ◽  
Vol 49 (9) ◽  
pp. 142-153 ◽  
Author(s):  
Bong Mann Kim ◽  
Julia Lester ◽  
Laki Tisopulos ◽  
Melvin D. Zeldin
Keyword(s):  
South Coast ◽  
The South ◽  
South Coast Air Basin

scholarly journals Air quality impacts of liquefied natural gas in the South Coast Air Basin of California

2014 ◽  
Vol 21 ◽  
pp. 680-690 ◽  
Author(s):  
Marc Carreras-Sospedra ◽  
Melissa M. Lunden ◽  
Jack Brouwer ◽  
Brett C. Singer ◽  
Donald Dabdub
Keyword(s):  
Air Quality ◽  
Natural Gas ◽  
Liquefied Natural Gas ◽  
South Coast ◽  
The South ◽  
South Coast Air Basin

scholarly journals Impacts of electronically photo-excited NO<sub>2</sub> on air pollution in the South Coast Air Basin of California

2010 ◽  
Vol 10 (3) ◽  
pp. 1171-1181 ◽  
Author(s):  
J. J. Ensberg ◽  
M. Carreras-Sospedra ◽  
D. Dabdub
Keyword(s):  
Particulate Matter ◽  
Rate Constant ◽  
Reaction Rate ◽  
Control Strategies ◽  
Reaction Rates ◽  
Reaction Rate Constant ◽  
South Coast ◽  
Nox Emissions ◽  
The South ◽  
South Coast Air Basin

Abstract. A new path for hydroxyl radical formation via photo-excitation of nitrogen dioxide (NO2) and the reaction of photo-excited NO2 with water is evaluated using the UCI-CIT model for the South Coast Air Basin of California (SoCAB). Two separate studies predict different reaction rates, which differ by nearly an order of magnitude, for the reaction of photo-excited NO2 with water. Impacts of this new chemical mechanism on ozone and particulate matter formation, while utilizing both reaction rates, are quantified by simulating two summer episodes. First, sensitivity simulations are conducted to evaluate the uncertainty in the rate of reaction of photo-excited NO2 with water reported in the literature. Results indicate that the addition of photo-excited NO2 chemistry increases peak 8-h average ozone and particulate matter concentrations. The importance of this new chemistry is then evaluated in the context of pollution control strategies. A series of simulations are conducted to generate isopleths for ozone and particulate matter concentrations, varying baseline nitrogen oxides (NOx) and volatile organic compounds (VOC) emissions. Isopleths are obtained using 1987 emissions, to represent past conditions, and 2005, to represent current conditions in the SoCAB. Results show that the sensitivity of modeled pollutant control strategies due to photoexcitation decreases with the decrease in baseline emissions from 1987 to 2005. Results show that including NO2 photo-excitation, increases the sensitivity of ozone concentration with respect to changes in NOx emissions for both years. In particular, decreasing NOx emissions in 2005 when NO2 photo-excitation is included, while utilizing the higher reaction rate, leads to ozone relative reduction factors that are 15% lower than in a case without photo-excited NO2. This implies that photoexcitation increases the effectiveness in reducing ozone through NOx emissions reductions alone, which has implications for the assessment of future emission control strategies. However, there is still disagreement with respect to the reaction rate constant for the formation of OH. Therefore, further studies are required to reduce the uncertainty in the reaction rate constant before this new mechanism is fully implemented in regulatory applications.

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