Preprints
https://doi.org/10.5194/gmd-2020-415
https://doi.org/10.5194/gmd-2020-415

Submitted as: development and technical paper 06 Jan 2021

Submitted as: development and technical paper | 06 Jan 2021

Review status: this preprint is currently under review for the journal GMD.

Simulating δ15N of atmospheric NOx in CMAQ version 5.2.1, based on 15N incorporated SMOKE version 4.6 and WRF version 4.0 for assessing the role atmospheric processes plays in controlling the isotopic composition of NOx, NOy, and atmospheric nitrate

Huan Fang1 and Greg Michalski1,2 Huan Fang and Greg Michalski
  • 1Department of Earth, Atmospheric, and Planetary Sciences Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, USA
  • 2Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA

Abstract. Nitrogen oxides (NOx = nitric oxide (NO) + nitrogen dioxides (NO2)) are important trace gases that affect atmospheric chemistry, air quality, and climate. Despite the importance of NOx emissions, there are significant uncertainties in NOx emission inventories. After NOx from different sources being emitted into the atmosphere, its composition will change due to atmospheric processes. In this study, we used the nitrogen stable isotope composition of NOx15N(NOx)) to trace the changes in δ15N values along the journey of atmospheric NOx, by incorporating 15N into the emission input dataset prepared from the previous companion research (Fang & Michalski, 2020) to run CMAQ (the Community Multiscale Air Quality Modeling System). The simulated spatiotemporal patterns in NOx isotopic composition were compared with corresponding atmospheric measurements in West Lafayette, Indiana, USA. The results indicate that estimating of atmospheric δ15N(NOx) using CMAQ shows better agreement with observation than using SMOKE (Sparse Matrix Operator Kernel Emissions), due to the consideration of mixing, disperse, transport, and deposition of NOx emission from different sources.

Huan Fang and Greg Michalski

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2020-415', Anonymous Referee #1, 05 Feb 2021
  • RC2: 'Comment on gmd-2020-415', Anonymous Referee #2, 04 Mar 2021

Huan Fang and Greg Michalski

Data sets

Simulating δ15N of atmospheric NOx with the impacts from atmospheric processes Huan Fang https://doi.org/10.5281/zenodo.4311986

Huan Fang and Greg Michalski

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Short summary
A new emission input dataset that incorporates nitrogen isotopes has been used in CMAQ (the Community Multiscale Air Quality Modeling System) simulation to qualitatively analyze the changes in δ15N values, due to the disperse, mixing, and transport of the atmospheric NOx emitted from different sources. The disperse, mixing, and transport of the atmospheric NOx were based on the meteorology files generated from WRF (the Weather Research and Forecasting Model).