Articles | Volume 14, issue 4
https://doi.org/10.5194/amt-14-3071-2021
https://doi.org/10.5194/amt-14-3071-2021
Research article
 | 
27 Apr 2021
Research article |  | 27 Apr 2021

Long-term NOx measurements in the remote marine tropical troposphere

Simone T. Andersen, Lucy J. Carpenter, Beth S. Nelson, Luis Neves, Katie A. Read, Chris Reed, Martyn Ward, Matthew J. Rowlinson, and James D. Lee

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Latest update: 17 Jul 2024
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Short summary
NOx has been measured in remote marine air via chemiluminescence detection using two different methods for NO2 to NO photolytic conversion: (a) internal diodes and a reaction chamber made of Teflon-like barium-doped material, which causes a NO2 artefact, and (b) external diodes and a quartz photolysis cell. Once corrections are made for the artefact of (a), the two converters are shown to give comparable NO2 mixing ratios, giving confidence in the quantitative measurement of NOx at low levels.