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Title: Nitrogen oxides in the global upper troposphere: interpreting cloud-sliced NO2 observations from the OMI satellite instrument
Authors: Marais, EA
Jacob, DJ
Choi, S
Joiner, J
Belmonte-Rivas, M
Cohen, RC
Beirle, S
Murray, LT
Schiferl, LD
Shah, V
Jaegle, L
First Published: 30-Nov-2018
Publisher: European Geosciences Union (EGU), Copernicus Publications
Citation: Atmospheric Chemistry and Physics, 2018, 18 (23), pp. 17017-17027 (11)
Abstract: Nitrogen oxides (NOx ≡ NO + NO2) in the upper troposphere (UT) have a large impact on global tropospheric ozone and OH (the main atmospheric oxidant). New cloudsliced observations of UT NO2 at 450–280 hPa (∼ 6–9 km) from the Ozone Monitoring Instrument (OMI) produced by NASA and the Royal Netherlands Meteorological Institute (KNMI) provide global coverage to test our understanding of the factors controlling UT NOx . We find that these products offer useful information when averaged over coarse scales (20◦ × 32◦ , seasonal), and that the NASA product is more consistent with aircraft observations of UT NO2. Correlation with Lightning Imaging Sensor (LIS) and Optical Transient Detector (OTD) satellite observations of lightning flash frequencies suggests that lightning is the dominant source of NOx to the upper troposphere except for extratropical latitudes in winter. The NO2 background in the absence of lightning is 10–20 pptv. We infer a global mean NOx yield of 280 ± 80 moles per lightning flash, with no significant difference between the tropics and midlatitudes, and a global lightning NOx source of 5.9 ± 1.7 Tg N a−1 . There is indication that the NOx yield per flash increases with lightning flash footprint and with flash energy
DOI Link: 10.5194/acp-18-17017-2018
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This work was funded by the NASA Tropospheric Chemistry Program and a University of Birmingham Research Fellowship and NERC/EPSRC grant (EP/R513465/1) awarded to Eloise A. Marais. Model simulations were performed on the University of Birmingham's BlueBEAR High-Performance Cluster (HPC). The authors would like to thank the BlueBEAR support team for IT and HPC support.
Description: Data from this work can be made available upon request: Eloise A. Marais for GEOS-Chem output, Maria Belmonte-Rivas for KNMI OMI UT NO2, Sungyeon Choi and Joanna Joiner for NASA OMI UT NO2, and Steffen Beirle for LIS lightning properties. Aircraft observations are available at for SEAC4RS (NASA, 2017a, last access: 1 April 2017), for DC3 (NASA, 2017b, last access: 1 April 2017), for INTEX-A (NASA, 2017c, last access: 1 April 2017), for INTEX-B (NASA, 2017d, last access: 1 April 2017), and for ARCTAS (NASA, 2017e, last access: 1 April 2017). Supplement. The supplement related to this article is available online at:
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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