Articles | Volume 23, issue 2
Research article
24 Jan 2023
Research article |  | 24 Jan 2023

Nitrogen oxides in the free troposphere: implications for tropospheric oxidants and the interpretation of satellite NO2 measurements

Viral Shah, Daniel J. Jacob, Ruijun Dang, Lok N. Lamsal, Sarah A. Strode, Stephen D. Steenrod, K. Folkert Boersma, Sebastian D. Eastham, Thibaud M. Fritz, Chelsea Thompson, Jeff Peischl, Ilann Bourgeois, Ilana B. Pollack, Benjamin A. Nault, Ronald C. Cohen, Pedro Campuzano-Jost, Jose L. Jimenez, Simone T. Andersen, Lucy J. Carpenter, Tomás Sherwen, and Mat J. Evans

Data sets

SEAC4RS Field Campaign Data SEAC4RS Science Team

DC3 Field Campaign Data from DC-8 aircraft DC3 Science Team

ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2 S. C. Wofsy, S. Afshar, H. M. Allen, et al.

ATom: Global Modeling Initiative (GMI) Chemical Transport Model (CTM) Output S. A. Strode, S. D. Steenrod, J. M. Nicely, J. Liu, M. R. Damon, and S. E. Strahan

Model code and software

GEOS-Chem 12.9.2 The International GEOS-Chem User Community

Short summary
NOx in the free troposphere (above 2 km) affects global tropospheric chemistry and the retrieval and interpretation of satellite NO2 measurements. We evaluate free tropospheric NOx in global atmospheric chemistry models and find that recycling NOx from its reservoirs over the oceans is faster than that simulated in the models, resulting in increases in simulated tropospheric ozone and OH. Over the U.S., free tropospheric NO2 contributes the majority of the tropospheric NO2 column in summer.
Final-revised paper