Ozone production and trace gas correlations during the June 2000 MINATROC intensive measurement campaign at Mt. Cimone

Fischer, H.; Kormann, R.; Klüpfel, T.; Gurk, C.; Königstedt, R.; Parchatka, Uwe; Mühle, Jens; Rhee, Tae Siek; Brenninkmeijer, C. A. M.; Bonasoni, Paolo; Stohl, Andreas

doi:10.5194/acp-3-725-2003

Cited by 101 publications

(41 citation statements)

References 46 publications

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“…This pattern was also the case for most of the other species (figures not shown), and consistent with the diurnal variations of CO during the same studies . Such diurnal variation of air pollutants is opposite to those observed at other mountainous sites, which generally show higher daytime and lower nighttime levels driven by the mountain-valley breezes (Zaveri et al, 1995;Fischer et al, 1998Fischer et al, , 2003Zellweger et al, 2000;Carpenter et al, 2000). As a mountaintop site, WLG is also affected by mountain-valley breezes, with local anabatic and catabatic winds clearly observed during the observations Xue et al, 2011).…”

Section: Temporal Variation and Comparison Withmentioning

confidence: 59%

Sources and photochemistry of volatile organic compounds in the remote atmosphere of western China: results from the Mt. Waliguan Observatory

et al. 2013

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The chemistry of the natural atmosphere and the influence by long-range transport of air pollution are key issues in the atmospheric sciences. Here we present two intensive field measurements of volatile organic compounds (VOCs) in late spring and summer of 2003 at Mt. Waliguan (WLG, 36.28° N, 100.90° E, 3816 m a.s.l.), a baseline station in the northeast part of the Qinghai-Tibetan Plateau. Most VOC species exhibited higher concentrations in late spring than in summer. A typical diurnal variation was observed with higher nighttime levels, in contrast to results from other mountainous sites. Five different air masses were identified from backward trajectory analysis showing distinct VOC speciation. Air masses originating from the central Eurasian continent contained the lowest VOC levels compared to the others that were impacted by anthropogenic emissions from China and the Indian subcontinent. A photochemical box model based on the Master Chemical Mechanism (version 3.2) and constrained by a full suite of measurements was developed to probe the photochemistry of atmosphere at WLG. Our results show net ozone production from in situ photochemistry during both late spring and summer. Oxidation of nitric oxide (NO) by the hydroperoxyl radical (HO₂) dominates the ozone production relative to the oxidation by the organic peroxy radicals (RO₂), and the ozone is primarily destroyed by photolysis and reactions with the HO_x (HO_x = OH + HO₂) radicals. Ozone photolysis is the predominant primary source of radicals (RO_x = OH + HO₂ + RO₂), followed by the photolysis of secondary oxygenated VOCs and hydrogen peroxides. The radical losses are governed by the self and cross reactions among the radicals. Overall, the findings of the present study provide insights into the background chemistry and the impacts of pollution transport on the pristine atmosphere over the Eurasian continent

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Section: Temporal Variation and Comparison Withmentioning

confidence: 59%

Sources and photochemistry of volatile organic compounds in the remote atmosphere of western China: results from the Mt. Waliguan Observatory

et al. 2013

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“…It is located south of the Po Basin and is a strategic platform to study chemical and physical characteristics of regional background conditions and air mass transport. The measurements of atmospheric compounds carried out at CMN can be considered representative of the South European and North Mediterranean free troposphere (Fischer et al, 2003). Nevertheless, due to enhanced vertical mixing and a mountain breeze wind regime, during the warm months an influence from the lowest layer of the troposphere cannot be ruled out (Marinoni et al, 2008;Cristofanelli et al, 2007).…”

Section: Eusaar -European Supersites For Atmospheric Aerosol Researchmentioning

confidence: 99%

Number size distributions and seasonality of submicron particles in Europe 2008–2009

et al. 2011

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Abstract.Two years of harmonized aerosol number size distribution data from 24 European field monitoring sites have been analysed. The results give a comprehensive overview of the European near surface aerosol particle number concentrations Correspondence to: A. Asmi (ari.asmi@helsinki.fi) and number size distributions between 30 and 500 nm of dry particle diameter. Spatial and temporal distribution of aerosols in the particle sizes most important for climate applications are presented. We also analyse the annual, weekly and diurnal cycles of the aerosol number concentrations, provide log-normal fitting parameters for median number size distributions, and give guidance notes for data users. Emphasis is placed on the usability of results within the aerosol modelling community.Published by Copernicus Publications on behalf of the European Geosciences Union. We also show that the aerosol number concentrations of Aitken and accumulation mode particles (with 100 nm dry diameter as a cut-off between modes) are related, although there is significant variation in the ratios of the modal number concentrations. Different aerosol and station types are distinguished from this data and this methodology has potential for further categorization of stations aerosol number size distribution types.The European submicron aerosol was divided into characteristic types: Central European aerosol, characterized by single mode median size distributions, unimodal number concentration histograms and low variability in CCN-sized aerosol number concentrations; Nordic aerosol with low number concentrations, although showing pronounced seasonal variation of especially Aitken mode particles; Mountain sites (altitude over 1000 m a.s.l.) with a strong seasonal cycle in aerosol number concentrations, high variability, and very low median number concentrations. Southern and Western European regions had fewer stations, which decreases the regional coverage of these results. Aerosol number concentrations over the Britain and Ireland had very high variance and there are indications of mixed air masses from several source regions; the Mediterranean aerosol exhibit high seasonality, and a strong accumulation mode in the summer. The greatest concentrations were observed at the Ispra station in Northern Italy with high accumulation mode number concentrations in the winter. The aerosol number concentrations at the Arctic station Zeppelin in Ny-Ålesund in Svalbard have also a strong seasonal cycle, with greater concentrations of accumulation mode particles in winter, and dominating summer Aitken mode indicating more recently formed particles. Observed particles did not show any statistically significant regional work-week or weekday related variation in number concentrations studied.Analysis products are made for open-access to the research community, available in a freely accessible internet site. The results give to the modelling community a reliable, easy-touse and freely available comparison dataset of aerosol size distributions.

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“…These features indicate that the site was within the residual layer/free troposphere (e.g. Fischer et al, 2003). To separate the data the ozone values were multiplied by the mirrored relative humidity (100-RH).…”

Section: Transport Processes and Influence Of The Source Region And Tmentioning

confidence: 99%

Volatile organic compounds (VOCs) in photochemically aged air from the eastern and western Mediterranean

et al. 2017

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Abstract. During the summertime CYPHEX campaign (CYprus PHotochemical EXperiment 2014) in the eastern Mediterranean, multiple volatile organic compounds (VOCs) were measured from a 650 m hilltop site in western Cyprus (34 • 57 N/32 • 23 E). Periodic shifts in the northerly Etesian winds resulted in the site being alternately impacted by photochemically processed emissions from western (Spain, France, Italy) and eastern (Turkey, Greece) Europe. Furthermore, the site was situated within the residual layer/free troposphere during some nights which were characterized by high ozone and low relative humidity levels. In this study we examine the temporal variation of VOCs at the site. The sparse Mediterranean scrub vegetation generated diel cycles in the reactive biogenic hydrocarbon isoprene, from very low values at night to a diurnal median level of 80-100 pptv. In contrast, the oxygenated volatile organic compounds (OVOCs) methanol and acetone exhibited weak diel cycles and were approximately an order of magnitude higher in mixing ratio (ca. 2.5-3 ppbv median level by day, range: ca. 1-8 ppbv) than the locally emitted isoprene and aromatic compounds such as benzene and toluene. Acetic acid was present at mixing ratios between 0.05 and 4 ppbv with a median level of ca. 1.2 ppbv during the daytime. When data points directly affected by the residual layer/free troposphere were excluded, the acid followed a pronounced diel cycle, which was influenced by various local effects including photochemical production and loss, direct emission, dry deposition and scavenging from advecting air in fog banks. The Lagrangian model FLEXPART was used to determine transport patterns and photochemical processing times (between 12 h and several days) of air masses originating from eastern and western Europe. Ozone and many OVOC levels were ∼ 20 and ∼ 30-60 % higher, respectively, in air arriving from the east. Using the FLEXPART calculated transport time, the contribution of photochemical processing, sea surface contact and dilution was estimated. Methanol and acetone decreased with residence time in the marine boundary layer (MBL) with loss rate constants of 0.74 and 0.53 day −1 from eastern Europe and 0.70 and 0.34 day −1 from western Europe, respectively. Simulations using the EMAC model underestimate these loss rates. The missing sink in the calculation is most probably an oceanic uptake enhanced by microbial consumption of methanol and acetone, although the temporal and spatial variability in the source strength on the continents might play a role as well. Correlations between acetone and methanol were weaker in western air massesPublished by Copernicus Publications on behalf of the European Geosciences Union. = 0.68), but were stronger in air masses measured after the shorter transport time from the east (r 2 = 0.73).

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Ozone production and trace gas correlations during the June 2000 MINATROC intensive measurement campaign at Mt. Cimone

Cited by 101 publications

References 46 publications

Sources and photochemistry of volatile organic compounds in the remote atmosphere of western China: results from the Mt. Waliguan Observatory

Sources and photochemistry of volatile organic compounds in the remote atmosphere of western China: results from the Mt. Waliguan Observatory

Number size distributions and seasonality of submicron particles in Europe 2008–2009

Volatile organic compounds (VOCs) in photochemically aged air from the eastern and western Mediterranean

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