Statistical analysis of eight surface ozone measurement series for various sites in Ireland

Tripathi, Om Prakash; Jennings, S. G.; O’Dowd, Colin; Coleman, L.F.; Leinert, S.; O’Leary, Barbara; Moran, Eoin; O’Doherty, Simon; Spain, T.G.

doi:10.1029/2010jd014040

Cited by 20 publications

(16 citation statements)

References 50 publications

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“…The methodology used in this study is described in more detail in Tripathi et al . []. The cluster analysis yielded an optimal number of 11 clusters for Mace Head.…”

Section: Methodsmentioning

confidence: 99%

Submicron NE Atlantic marine aerosol chemical composition and abundance: Seasonal trends and air mass categorization

Ovadnevaitė

Čeburnis

Leinert

et al. 2014

J. Geophys. Res. Atmos.

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Three years of continuous Aerosol Mass Spectrometry measurements at the Mace Head GlobalAtmosphere Watch research station revealed seasonal patterns in the chemical composition of submicron NE Atlantic marine aerosol as well as distinct chemical signatures associated with marine air masses of different origin (i.e., polar, Arctic, or tropical). Concentrations of secondary inorganic aerosol species and both primary and secondary organic compounds were closely related to oceanic biological activity and ranged from low median mass concentrations during winter to high median values during summer as follows: 0.025-0.9 μg m ). Maritime polar air masses typically featured the highest concentrations of sea salt and marine organics, particularly enhanced under primary organic plumes during periods of high biological activity. MSA and nss-sulfate were more prominent in tropical air masses. The oxidation of organic matter increased with increasing ozone concentration and wintertime (low biological activity) organic matter displayed a different fragmentation pattern from that of summertime organic compounds.

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“…The methodology used in this study is described in more detail in Tripathi et al . []. The cluster analysis yielded an optimal number of 11 clusters for Mace Head.…”

Section: Methodsmentioning

confidence: 99%

Submicron NE Atlantic marine aerosol chemical composition and abundance: Seasonal trends and air mass categorization

Ovadnevaitė

Čeburnis

Leinert

et al. 2014

J. Geophys. Res. Atmos.

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“…Over some Europeans stations (Hohenpeissenberg, Zugspitze and Mace Head) small trends or reductions during summer are observed, while there is an increase during winter (Oltmans et al, 2006). Mace Head, a site that is representative of O 3 changes in the air advected from the North Atlantic to Europe in the MBL, has shown a positive trend of 0.16 ± 0.04 ppb yr −1 over the entire period 1988-2007, but this positive trend has reduced during recent years (Tripathi et al, 2010). Hence, tropospheric O 3 trends over Europe do not show a homogeneous behaviour.…”

Section: North Atlantic Oscillation (Nao) Indexmentioning

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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“…Cluster analysis has been performed to interpret ozone concentrations in Mace Head by Cape et al [2000] and Tripathi et al [2010], to relate variations in aerosol size distribution close to Elche [Cabello et al, 2008], and to analyze the transport pathways associated to naturally occurring radionuclides of either stratospheric or soil origin at Málaga [Dueñas et al, 2011]. For Lecce [Santese et al, 2008], trajectories were classified according to geographical sectors defined after a sensitivity study that used aerosol optical depth measures.…”

Section: Introductionmentioning

confidence: 99%

“…Henne et al [2010] studied the Cabauw back trajectory footprint to analyze the spatial representativeness together with that of 33 other sites, and Vermeulen et al [2011] presented the footprint for sensitivity to greenhouse gas emissions based on trajectory calculations. The work of Tripathi et al [2010] identified the main air flow types reaching Mace Head from a back trajectory cluster analysis for a 20 year period, though trends in ozone concentration was done for trajectories combined into four main directions (compass sectors). The rest of those works considered much shorter study period.…”

Section: Introductionmentioning

confidence: 99%

The Association Between the North Atlantic Oscillation and the Interannual Variability of the Tropospheric Transport Pathways in Western Europe

Orza¹,

Cabello²,

Galiano³

et al. 2013

Lagrangian Modeling of the Atmosphere

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The variations in tropospheric transport pathways over a 20 year period, 1990-2009, are studied at six locations in Europe. Three Atlantic (Lisbon, Mace Head, and Cabauw) and three Mediterranean sites (Málaga and Elche in the western part and Lecce in the central Mediterranean) are considered. The work is based on the identification of flow types at each location by robust cluster analysis of the trajectories, the assessment of temporal trends for each advection pattern, and subsequent quantification of the association, at the monthly scale, between the North Atlantic Oscillation (NAO) index (NAOi) and the frequency of occurrence of the identified flows. This exploratory study demonstrates the usefulness of the approach for specific locations in a context where synoptic circulation/weathertype classifications are usually used. A different number of advection pathways were identified at each location. Common features to all the sites were prevalence of westerly flows, strong seasonal variability, and association of the air flow types to known synoptic situations in both phases of the NAO. The degree of association varies strongly with latitude, location within the Mediterranean basin, and closeness to the action centers. Overall, flows reaching Mace Head and Cabauw present stronger association to the NAO, which is substantially reduced at lower latitudes and is not significant at Lisbon. Significant temporal trends are found for northerly flows at Mace Head and Málaga, associated to changes at the beginning of the study period that are also present in the NAOi time series. WSW flows at Mace Head exhibit a steady decreasing trend over the whole period.

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Statistical analysis of eight surface ozone measurement series for various sites in Ireland

Cited by 20 publications

References 50 publications

Submicron NE Atlantic marine aerosol chemical composition and abundance: Seasonal trends and air mass categorization

Submicron NE Atlantic marine aerosol chemical composition and abundance: Seasonal trends and air mass categorization

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

The Association Between the North Atlantic Oscillation and the Interannual Variability of the Tropospheric Transport Pathways in Western Europe

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