2019
DOI: 10.5194/acp-2019-416
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Abstract: The Arabian Peninsula is characterized by high and increasing levels of photochemical air pollution. Strong solar irradiation, high temperatures and large anthropogenic emissions of reactive trace gases result in intense photochemical activity, especially during the summer months. However, air chemistry measurements in the region are scarce. In order to assess regional pollution sources and oxidation rates, the first ship-based direct measurements of total OH reactivity were 15 performed in summer 2017 from a … Show more

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Cited by 6 publications
(7 citation statements)
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“…The uncertainty of the k X i +OH for standard-calibrated compounds and specifically assigned compounds was estimated to be ∼10%, while for the averaged k X i +OH derived from isomeric compounds, a large uncertainty (100%) was estimated. 30 The uncertainty of calculated reactivity for each species is a propagation of uncertainties from the mixing ratio and the k X i +OH . Therefore, the total uncertainty of the total calculated OH reactivity is highly dependent on the reactivity fraction of the species having less uncertainty (i.e., standard-calibrated compounds), with a mean and median uncertainty of 29% for the experiments in this study.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…The uncertainty of the k X i +OH for standard-calibrated compounds and specifically assigned compounds was estimated to be ∼10%, while for the averaged k X i +OH derived from isomeric compounds, a large uncertainty (100%) was estimated. 30 The uncertainty of calculated reactivity for each species is a propagation of uncertainties from the mixing ratio and the k X i +OH . Therefore, the total uncertainty of the total calculated OH reactivity is highly dependent on the reactivity fraction of the species having less uncertainty (i.e., standard-calibrated compounds), with a mean and median uncertainty of 29% for the experiments in this study.…”
Section: Methodsmentioning
confidence: 99%
“…The OH reactivity in this study is determined using the comparative reactivity method (CRM), 29 which has been applied in various outdoor locations worldwide from megacities to rainforests. 25 , 26 , 30 32 A recent intercomparison of OH reactivity methods has shown that the CRM method accurately measures OH reactivity, 33 especially under high OH reactivity conditions. Therefore, indoor environments, where high OH reactivity can be expected, present a good application for this method.…”
Section: Introductionmentioning
confidence: 99%
“…The model attributes 47% (0.7 s −1 ) of the 1.5 s −1 VOC reactivity in this region to oil and gas C 2 ‐C 5 alkanes. Similarly, a recent study by Pfannerstill et al (2019) around the Arabian Peninsula found the highest contribution from alkanes to total OH reactivity (on average 1.2 s −1 or 9% of total OH reactivity) in the Arabian Gulf (also known as Persian Gulf). Among the regions in that study, the Arabian Gulf is the region that encompasses the largest number of gas fields.…”
Section: Resultsmentioning
confidence: 61%
“…by defining ozone production regimes in terms of the OH reactivities of VOCs and NOx. Based on this analysis, the relatively clean air of the Arabian Sea was found to be due to partially NOxlimited ozone production in this region (Pfannerstill et al, 2019).…”
Section: Ozonementioning
confidence: 88%