Simulating δ15N of atmospheric NOx with the impacts from gas-phase tropospheric photochemistry within Midwestern United States

The new chemical mechanisms, which incorporate the 15N isotope, were used to simulate the δ15N values in CMAQ (the Community Multiscale Air Quality Modeling System), in order to qualitatively analyze the changes in δ15N values within Midwestern United States, due to the gas-phase tropospheric photochemistry of the atmospheric NOx emitted from different sources.本研究采用引入15N同位素（15N isotope）的新型化学机制，对社区多尺度空气质量模型系统（Community Multiscale Air Quality Modeling System，CMAQ）中的δ15N值进行模拟，以定性分析美国中西部地区内，不同排放源排放的大气氮氧化物（NOₓ）经对流层气相光化学反应后引发的δ15N值变化。