2023
DOI: 10.5194/acp-23-1227-2023
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Nitrogen oxides in the free troposphere: implications for tropospheric oxidants and the interpretation of satellite NO2 measurements

Abstract: Abstract. Satellite-based retrievals of tropospheric NO2 columns are widely used to infer NOx (≡ NO + NO2) emissions. These retrievals rely on model information for the vertical distribution of NO2. The free tropospheric background above 2 km is particularly important because the sensitivity of the retrievals increases with altitude. Free tropospheric NOx also has a strong effect on tropospheric OH and ozone concentrations. Here we use observations from three aircraft campaigns (SEAC4RS, DC3, and ATom) and fou… Show more

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Cited by 40 publications
(50 citation statements)
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“…Overall, our analysis shows the urgent need for a critical revision of the external cycling pathways of NO x and HONO and the oxidative capacity of the atmosphere. However, budget closure measurements of NO 2 and NO z which are essential to explore external cycling, are only sporadically available, especially for low-NO x atmospheres 5,17,35,49,50 . Distribution patterns of HONO (a), NO (b), HONO/NO y ratio (c), NO 2 /NO y ratio (d), HONO/NO 2 ratio (e), and (f) during plume aging under the full sun scenario NO x emission in a fresh plant plume as simulated by the MCM model (SI).…”
Section: Resultsmentioning
confidence: 99%
“…Overall, our analysis shows the urgent need for a critical revision of the external cycling pathways of NO x and HONO and the oxidative capacity of the atmosphere. However, budget closure measurements of NO 2 and NO z which are essential to explore external cycling, are only sporadically available, especially for low-NO x atmospheres 5,17,35,49,50 . Distribution patterns of HONO (a), NO (b), HONO/NO y ratio (c), NO 2 /NO y ratio (d), HONO/NO 2 ratio (e), and (f) during plume aging under the full sun scenario NO x emission in a fresh plant plume as simulated by the MCM model (SI).…”
Section: Resultsmentioning
confidence: 99%
“…Such a NO 2 diel profile lacking a daytime minimum or with a solar noon peaks was observed in the marine boundary layer with NO x concentrations of 20–30 pptv in Cape Verde (Lee et al., 2009) and 40–200 pptv in Loop Head (52.5°N, 10°W) (Helas & Warneck, 1981) and seems to be extrapolated to low‐NO x background atmospheres such as the polar region (Domine & Shepson, 2002; Honrath et al., 2002), tropical forests (Zhou et al., 2011), and the clean free troposphere (Andersen et al., 2023; Shah et al., 2023; Silvern et al., 2018; Yang et al., 2023). The reported solar noon peaks of the NO 2 mixing ratios ranged from tens of pptv to ∼200 pptv, which were higher than the values predicted by the current models.…”
Section: Resultsmentioning
confidence: 99%
“…As described in Shah et al. (2023), Equation corrects previous GEOS‐Chem low bias in simulating NO x concentrations over the remote oceans. It is consistent with the inverse relationship between EF and ][pNO3 $\left[\text{pN}{\mathrm{O}}_{3}^{-}\right]$ derived by Andersen et al.…”
Section: Methodsmentioning
confidence: 96%