Surface ozone at the Caucasian site Kislovodsk High Mountain Station and the Swiss Alpine site Jungfraujoch: data analysis and trends (1990–2006)

Tarasova, Oksana; Senik, I. A.; Sosonkin, M. G.; Cui, J.; Staehelin, J.; Prévôt, Andrê S. H.

doi:10.5194/acp-9-4157-2009

Cited by 26 publications

(19 citation statements)

References 52 publications

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“…2a), CMN (~60 ppb) (Bonasoni et al 2000a;Campana et al 2005; Fig. 2e), KSL (Elansky et al 1995;Senik and Elansky 2001;Senik et al 2005;Tarasova et al 2003Tarasova et al , 2009, KVV (~55 ppb; Fig. 2d), ARO Pochanart et al 2001;Staehelin et al 1994), and JFJ (~60 ppb;Balzani Lööv et al 2008;Schuepbach et al 2001;Zanis et al 2007; Fig.…”

Section: Seasonal Variationsmentioning

confidence: 98%

“…Although total anthropogenic NO x emissions at northern mid-latitudes increased by only~14 % for the period from 1980 to 2010, long-term O 3 trends showed remarkable increases . The long-term trend for surface O 3 at KSL in Caucasus differed from that in central and southern Europe (Senik and Elansky 2001;Tarasova et al 2003Tarasova et al , 2009 with the former showing a decreasing trend in the 1990s (Senik and Elansky 2001;Tarasova et al 2003). For the period from 1991 to 2001, a strong concentration change of −0.91 ± 0.17 ppb year −1 was observed, after which the O 3 changes decreased to −0.37 ± 0.14 ppb year −1 for the period from 1997 to 2006 (Tarasova et al 2009).…”

Section: Seasonal Variationsmentioning

confidence: 99%

“…The main features of air transport to KSL in the summer are the prevailing northern components, which include the town of Kislovodsk and the Caucasus foothills, and the northeastern components, which include the northern Caspian. In the winter, the main air transport features are the prevailing southern components, which include the regions behind the Caucasus and Asia Minor deserts, and the southwestern components, which include the Mediterranean and the deserts of North Africa (Tarasova et al 2003).…”

Section: Region Vi: Europementioning

confidence: 99%

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A review of atmospheric chemistry observations at mountain sites

Okamoto

Tanimoto

2016

Prog. in Earth and Planet. Sci.

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Located far from anthropogenic emission sources, high-altitude mountain stations are considered to be ideal sites for monitoring climatic and environmentally important baseline changes in free tropospheric trace gases and aerosols. In addition, the observations taken at these stations are often used to study the long-range transport of dust as well as anthropogenic and biomass burning pollutants from source regions and to evaluate the performance of global and regional models. In this paper, we summarize the results from past and ongoing field measurements of atmospheric constituents at high-altitude stations across the globe, with particular emphasis on reactive trace species including tropospheric ozone, along with its precursors such as carbon monoxide, nitrogen oxides, total reactive nitrogen, and nonmethane hydrocarbons. Over the past decades, our understanding of the temporal variability and meteorological mechanisms of long-range transport has advanced in tandem with progress in instrumentation and modeling. Finally, the future needs of atmospheric chemistry observations at mountain sites are addressed.

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Section: Seasonal Variationsmentioning

confidence: 98%

Section: Seasonal Variationsmentioning

confidence: 99%

Section: Region Vi: Europementioning

confidence: 99%

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A review of atmospheric chemistry observations at mountain sites

Okamoto

Tanimoto

2016

Prog. in Earth and Planet. Sci.

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“…The surface O 3 positive trend found at elevated European sites was explained by Ordóñez et al (2007) in terms of an increased contribution of stratospheric O 3 in the 90s. Conversely, Tarasova et al (2003) found negative trends in a high mountain in Russia, and Vingarzan (2004) and Tarasova et al (2009) reported a slower rate of tropospheric O 3 increase or in some cases lack of an increase over the past decade. Logan et al (2012) found a slow decrease in summer surface ozone in alpine stations and in the free troposphere over Europe, with an average trend of −0.15 ppb yr −1 since 1998.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere

et al. 2013

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Abstract. An analysis of the 22-yr ozone (O3) series (1988–2009) at the subtropical high mountain Izaña~station (IZO; 2373 m a.s.l.), representative of free troposphere (FT) conditions, is presented. Diurnal and seasonal O3 variations as well as the O3 trend (0.19 ± 0.05 % yr−1 or 0.09 ppbv yr−1), are assessed. A climatology of O3 transport pathways using backward trajectories shows that higher O3 values are associated with air masses travelling above 4 km altitude from North America and North Atlantic Ocean, while low O3 is transported from the Saharan continental boundary layer (CBL). O3 data have been compared with PM10, 210Pb, 7Be, potential vorticity (PV) and carbon monoxide (CO). A clear negative logarithmic relationship was observed between PM10 and surface O3 for all seasons. A similar relationship was found between O3 and 210Pb. The highest daily O3 values (90th percentile) are observed in spring and in the first half of summer time. A positive correlation between O3 and PV, and between O3 and 7Be is found throughout the year, indicating that relatively high surface O3 values at IZO originate from the middle and upper troposphere. We find a good correlation between O3 and CO in winter, supporting the hypothesis of long-range transport of photochemically generated O3 from North America. Aged air masses, in combination with sporadic inputs from the upper troposphere, are observed in spring, summer and autumn. In summer time high O3 values seem to be the result of stratosphere-to-troposphere (STT) exchange processes in regions neighbouring the Canary Islands. Since 1995–1996, the North Atlantic Oscillation has changed from a predominantly high positive phase to alternating between negative, neutral or positive phases. This change results in an increased flow of the westerlies in the mid-latitude and subtropical North Atlantic, thus favouring the transport of O3 and its precursors from North America, and a higher frequency of storms over North Atlantic, with a likely higher incidence of STT processes in mid-latitudes. These processes lead to an increase of tropospheric O3 in the subtropical North Atlantic region after 1996 that has been reflected in surface O3 records at IZO.

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“…There are indications that O 3 at mountain tops in Europe increase due to stratospheric input (Ordóñez et al, 2007;Tarasova et al, 2009). Furthermore, the transport of Asian pollution in the upper troposphere over the Pacific has been shown to be subject to mixing with lower stratospheric air in summertime (Liang et al, 2007).…”

Section: Changes In Stratospheric Ozonementioning

confidence: 99%

Can a global model reproduce observed trends in summertime surface ozone levels?

Koumoutsaris

Bey

2012

Atmos. Chem. Phys.

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Abstract. Quantifying trends in surface ozone concentrations is critical for assessing pollution control strategies. Here we use observations and results from a global chemical transport model to examine the trends (1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) in daily maximum 8-h average concentrations in summertime surface ozone at rural sites in Europe and the United States (US). We find a decrease in observed ozone concentrations at the high end of the probability distribution at many of the sites in both regions. The model attributes these trends to a decrease in local anthropogenic ozone precursors, although simulated decreasing trends are overestimated in comparison with observed ones. The low end of observed distribution show small upward trends over Europe and the western US and downward trends in Eastern US. The model cannot reproduce these observed trends, especially over Europe and the western US. In particular, simulated changes between the low and high end of the distributions in these two regions are not significant. Sensitivity simulations indicate that emissions from far away source regions do not affect significantly summer ozone trends at both ends of the distribution in both Europe and US. Possible reasons for discrepancies between observed and simulated trends are discussed.

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Surface ozone at the Caucasian site Kislovodsk High Mountain Station and the Swiss Alpine site Jungfraujoch: data analysis and trends (1990–2006)

Cited by 26 publications

References 52 publications

A review of atmospheric chemistry observations at mountain sites

A review of atmospheric chemistry observations at mountain sites

Assessment of atmospheric processes driving ozone variations in the subtropical North Atlantic free troposphere

Can a global model reproduce observed trends in summertime surface ozone levels?

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