Simulating δ15N of NOx emission within Midwestern United States

<p>A new emission dataset of NO_x, which incorporates the ¹⁵N isotope in all emission sectors of SMOKE (Sparse Matrix Operator Kernel Emission) outputs, before merging into CMAQ (The Community Multiscale Air Quality Modeling System)-ready emission input dataset. Using this dataset to simulate the &delta;¹⁵N values in the 3-D photochemical transport models, such as CAMQ, and compare to the corresponding measurements, researchers could explore the evolution of &delta;¹⁵N values along the &ldquo;journey&rdquo; of atmospheric NO_x, thus evaluating and improving the accuracy of the NO_x emission inventory using ¹⁵N.</p>