2013
DOI: 10.1073/pnas.1216639110
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Isotopic composition of atmospheric nitrate in a tropical marine boundary layer

Abstract: Long-term observations of the reactive chemical composition of the tropical marine boundary layer (MBL) are rare, despite its crucial role for the chemical stability of the atmosphere. Recent observations of reactive bromine species in the tropical MBL showed unexpectedly high levels that could potentially have an impact on the ozone budget. Uncertainties in the ozone budget are amplified by our poor understanding of the fate of NO x (= NO + NO 2 ), particularly the importance of nighttime chemical NO x sinks.… Show more

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Cited by 82 publications
(96 citation statements)
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References 52 publications
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“…5c and 5d). All the observed values of δ 15 N-NO 3 − fall within the previously reported atmospheric δ 15 N-NO 3 − ranges in land (Elliott et al, 2009;Fang et al, 2011;Felix and Elliott, 2014) and in marine boundary layer (Altieri et al, 2013;Gobel et al, 2013;Hastings et al, 2003;Morin et al, 2009;Savarino et al, 2013). The mass-weighted mean aerosol δ 15 N-NO 3 − in 2014 (+1.6‰ in the ECSs, -1.1‰ for dust aerosol and -2.6‰ for background aerosol sampled in the NWPO) were similar to those in 2015 (+1.9‰ in the ECSs, -3.8‰…”
supporting
confidence: 65%
“…5c and 5d). All the observed values of δ 15 N-NO 3 − fall within the previously reported atmospheric δ 15 N-NO 3 − ranges in land (Elliott et al, 2009;Fang et al, 2011;Felix and Elliott, 2014) and in marine boundary layer (Altieri et al, 2013;Gobel et al, 2013;Hastings et al, 2003;Morin et al, 2009;Savarino et al, 2013). The mass-weighted mean aerosol δ 15 N-NO 3 − in 2014 (+1.6‰ in the ECSs, -1.1‰ for dust aerosol and -2.6‰ for background aerosol sampled in the NWPO) were similar to those in 2015 (+1.9‰ in the ECSs, -3.8‰…”
supporting
confidence: 65%
“…This contrasts with most other atmospheric O-bearing molecules including molecular oxygen (O 2 ), water (H 2 O), and peroxy radicals (RO 2 or HO 2 ) that have Δ 17 O values near 0‰ (Barkan & Luz, 2005). These differences provide quantitative measures to evaluate NO x oxidation chemistry involving various contributions from O 3 , HO x , RO x , and XO (where X = bromine [Br] or chlorine [Cl]) oxidation pathways (Michalski et al, 2003) and to compare modeled formation pathways (Alexander et al, 2009) with direct observations (Morin et al, 2008;Savarino et al, 2013 (Morin et al, 2011), representing a NO + O 3 branching ratio of 0.72 to 1.0. Post-NO 2 reaction pathways have been assumed to reflect O isotopic mass balance with the associated oxidants, which has been derived in previous works (Alexander et al, 2009;Ishino et al, 2017;Michalski et al, 2003;Morin et al, 2009) Patris et al, 2002;Sanusi et al, 2006), 21±0.1‰ for sea salt SO 4 2− (Rees et al, 1978), 3±3‰ for continental SO 4 2− (Jenkins & Bao, 2006;Li & Barrie, 1993;Norman et al, 1999), and 2.6±0.3‰ for stratospheric SO 4 2− (Castleman et al, 1974), respectively.…”
Section: Introductionmentioning
confidence: 99%
“…Under these conditions, the NO 2 in the atmosphere likely reflects 15 N/ 14 N ratios of local NO x sources [Freyer et al, 1993]. Therefore, this isotope exchange reaction has important implications for using the N stable isotope composition of atmospheric nitrate to partition NO x sources [Heaton, 1987;Freyer, 1991;Elliott et al, 2007Elliott et al, , 2009 or as a chemical tracer of atmospheric processes [Freyer, 1978[Freyer, , 1991Heaton, 1987;Freyer et al, 1993;Savarino et that depends on the thermodynamic differences between the N isotopologues of NO and NO 2 [Urey, 1947].…”
Section: Introductionmentioning
confidence: 99%