Intercomparison of two comparative reactivity method instruments inf the Mediterranean basin during summer 2013

Zannoni, Nora; Dusanter, Sébastien; Gros, Valérie; Esteve, R. Sarda; Michoud, Vincent; Sinha, Vinayak; Locoge, N.; Bonsang, B.

doi:10.5194/amt-8-3851-2015

Cited by 28 publications

(40 citation statements)

References 39 publications

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“…The difference between the measured OH reactivity (total sink of OH) and the calculated one using all measured compounds reported for this campaign indicates that approximately 56 ± 15 % (1σ on average) of the measured OH reactivity was missing. The largest fraction of missing OH reactivity was observed between 23 and 30 July, a period associated with the marine west and south clusters (Zannoni et al, 2016). Therefore, a large fraction of the VOCs composing the air masses reaching the site has not been measured yet.…”

Section: Gas Phasementioning

confidence: 99%

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Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment

et al. 2017

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Abstract. The ChArMEx (Chemistry and Aerosols Mediterranean Experiments) SOP2 (special observation period 2) field campaign took place from 15 July to 5 August 2013 in the western Mediterranean Basin at Ersa, a remote site in Cape Corse. During the campaign more than 80 volatile organic compounds (VOCs), including oxygenated species, were measured by different online and offline techniques. At the same time, an exhaustive description of the chemical composition of fine aerosols was performed with an aerosol chemical speciation monitor (ACSM). Low levels of anthropogenic VOCs (typically tens to hundreds of parts per trillion for individual species) and black carbon (0.1-0.9 µg m −3 ) were observed, while significant levels of biogenic species (peaking at the ppb level) were measured. Furthermore, secondary oxygenated VOCs (OVOCs) largely dominated the VOC speciation during the campaign, while organic matter (OM) dominated the aerosol chemical composition, representing 55 % of the total mass of non-refractory PM 1 on average (average of 3.74 ± 1.80 µg m −3 ), followed by sulfate (27 %, 1.83 ± 1.06 µg m −3 ), ammonium (13 %, 0.90 ± 0.55 µg m −3 ) and nitrate (5 %, 0.31 ± 0.18 µg m −3 ).Positive matrix factorization (PMF) and concentration field (CF) analyses were performed on a database containing 42 VOCs (or grouped VOCs), including OVOCs, to idenPublished by Copernicus Publications on behalf of the European Geosciences Union. 8838V. Michoud et al.: Organic carbon at a remote site of the western Mediterranean Basin tify the covariation factors of compounds that are representative of primary emissions or chemical transformation processes. A six-factor solution was found for the PMF analysis, including a primary and secondary biogenic factor correlated with temperature and exhibiting a clear diurnal profile. In addition, three anthropogenic factors characterized by compounds with various lifetimes and/or sources have been identified (long-lived, medium-lived and short-lived anthropogenic factors). The anthropogenic nature of these factors was confirmed by the CF analysis, which identified potential source areas known for intense anthropogenic emissions (north of Italy and southeast of France). Finally, a factor characterized by OVOCs of both biogenic and anthropogenic origin was found. This factor was well correlated with submicron organic aerosol (OA) measured by an aerosol chemical speciation monitor (ACSM), highlighting the close link between OVOCs and organic aerosols; the latter is mainly associated (96 %) with the secondary OA fraction. The source apportionment of OA measured by ACSM led to a three-factor solution identified as hydrogenlike OA (HOA), semi-volatile oxygenated OA (SV-OOA) and low volatility OOA (LV-OOA) for averaged mass concentrations of 0.13, 1.59 and 1.92 µg m −3 , respectively.A combined analysis of gaseous PMF factors with inorganic and organic fractions of aerosols helped distinguish between anthropogenic continental and biogenic influences on the aerosol-and gas-phase compositions.

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Section: Gas Phasementioning

confidence: 99%

“…1). The measurement site is surrounded by widespread vegetation, such as the "maquis" shrubland typical of Mediterranean areas (Zannoni et al, 2015). The closest city, Bastia, is located approximately 30 km south of the site.…”

Section: Description Of the Cape Corse Ground Sitementioning

confidence: 99%

Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment

et al. 2017

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“…Measurements taken with the MDOUAI CRM were also compared to measurements by the LSCE CRM during a field campaign at a remote site in France in summer 2013 (Zannoni et al, 2015). Both instruments sampled either ambient air or emissions from enclosed plants.…”

Section: Previous Comparisonsmentioning

confidence: 99%

“…Only two side-by-side comparisons have been performed between two CRM instruments in a remote environment (Zannoni et al, 2015) and between a CRM and a pump-probe instrument in an urban environment .…”

Section: Introductionmentioning

confidence: 99%

“…The CRM method is more commonly used than the direct OH measurement techniques because of the commercial availability of PTR-MS instruments. It is applied by the Max Planck Institute Mainz (MPI) (Sinha et al, 2008), IMT Lille Douai, formally called Mines Douai (MDOUAI) Michoud et al, 2015), Laboratoire des Sciences du Climat et de l'Environnement (LSCE) (Zannoni et al, 2015), Indian Institute of Science Education and Research Mohali (Kumar et al, 2014), the Finnish Meteorological Institute (Praplan et al, 2017), Peking University (Yang et al, 2017), the University of Leicester and University of California, Irvine (Kim et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of OH reactivity measurements in the atmospheric simulation chamber SAPHIR

Fuchs¹,

Novelli²,

Rolletter³

et al. 2017

Atmos. Meas. Tech.

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Abstract. Hydroxyl (OH) radical reactivity (k OH ) has been measured for 18 years with different measurement techniques. In order to compare the performances of instruments deployed in the field, two campaigns were conducted performing experiments in the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich in October 2015 and April 2016. Chemical conditions were chosen either to be representative of the atmosphere or to test potential limitations of instruments. All types of instruments that are currently used for atmospheric measurements were used in one of the two campaigns. The results of these campaigns demonstrate that OH reactivity can be accurately measured for a wide range of atmospherically relevant chemical conditions (e.g. water vapour, nitrogen oxides, various organic compounds) by all instruments. The precision of the measurements (limit of detection < 1 s −1 at a time resolution of 30 s to a few minutes) is higher for instruments directly detecting hydroxyl radicals, whereas the indirect comparative reactivPublished by Copernicus Publications on behalf of the European Geosciences Union. H. Fuchs et al.: OH reactivity comparison in SAPHIRity method (CRM) has a higher limit of detection of 2 s −1 at a time resolution of 10 to 15 min. The performances of the instruments were systematically tested by stepwise increasing, for example, the concentrations of carbon monoxide (CO), water vapour or nitric oxide (NO). In further experiments, mixtures of organic reactants were injected into the chamber to simulate urban and forested environments. Overall, the results show that the instruments are capable of measuring OH reactivity in the presence of CO, alkanes, alkenes and aromatic compounds. The transmission efficiency in Teflon inlet lines could have introduced systematic errors in measurements for low-volatile organic compounds in some instruments. CRM instruments exhibited a larger scatter in the data compared to the other instruments. The largest differences to reference measurements or to calculated reactivity were observed by CRM instruments in the presence of terpenes and oxygenated organic compounds (mixing ratio of OH reactants were up to 10 ppbv). In some of these experiments, only a small fraction of the reactivity is detected. The accuracy of CRM measurements is most likely limited by the corrections that need to be applied to account for known effects of, for example, deviations from pseudo first-order conditions, nitrogen oxides or water vapour on the measurement. Methods used to derive these corrections vary among the different CRM instruments. Measurements taken with a flowtube instrument combined with the direct detection of OH by chemical ionisation mass spectrometry (CIMS) show limitations in cases of high reactivity and high NO concentrations but were accurate for low reactivity (< 15 s −1 ) and low NO (< 5 ppbv) conditions.

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Total OH Reactivity

Gros

Zannoni

2022

Atmospheric Chemistry in the Mediterranean Region

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Intercomparison of two comparative reactivity method instruments inf the Mediterranean basin during summer 2013

Cited by 28 publications

References 39 publications

Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment

Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment

Comparison of OH reactivity measurements in the atmospheric simulation chamber SAPHIR

Total OH Reactivity

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