Air mass origin and its influence on radionuclide activities (7Be and 210Pb) in aerosol particles at a coastal site in the western Mediterranean

Dueñas, C.; Orza, J.A.G.; Cabello, M.; Fernández, M.C.; Cañete, S.; Pérez, M.; Gordo, Elisa

doi:10.1016/j.atmosres.2011.02.011

Cited by 54 publications

(25 citation statements)

References 41 publications

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“…However, on the basis of an ongoing study focussing on the characterization of advection patterns and their impacts on atmospheric composition at Mt. Cimone (Brattich et al, manuscript in preparation), the authors anticipate that some episodes of transport from North Africa appear to be characterized by concurrent uplift of crustal particles (leading to increases of PM 10 and 210 Pb) and downdrafts from the upper troposphere characterized by air masses enriched in 7 Be, in agreement with Dueñas et al (2011). The observation of stratospheric-upper tropospheric signals together with the arrival of dust from the Sahara desert can be tentatively attributed to the fact that the transit of troughs might favour both dust advection from the North Africa as well as tropopause folding.…”

Section: Resultssupporting

confidence: 52%

An outstanding Saharan dust event at Mt. Cimone (2165 m a.s.l., Italy) in March 2004

Brattich

Riccio

Tositti

et al. 2015

Atmospheric Environment

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Section: Resultssupporting

confidence: 52%

An outstanding Saharan dust event at Mt. Cimone (2165 m a.s.l., Italy) in March 2004

Brattich

Riccio

Tositti

et al. 2015

Atmospheric Environment

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“…Our present results are in good agreement with previous studies by Hernández et al [], Menut et al [], Dueñas et al [], and Gordo et al [], all conducive to an increase in both 7 Be and 210 Pb from Northern African transport. In fact, deep convection occurring during Saharan dust outbreaks always generates strong updraft and downdraft components: while usually the upward component carrying huge amounts of crustal particles dominates, in single episodes downdrafts are so strong to reach the upper troposphere and scavenge 7 Be and transport it together with crustal particles.…”

Section: Resultssupporting

confidence: 94%

“…Moreover, these airflows may interact with the Alps and therefore can be connected to STE in several ways. Interestingly, apart from likely “ghost sources” located west of the Canary Islands and east of Morocco, where a high conditional probability is located due to only few back trajectories during high concentration events, a high conditional probability is also detected in Northern Africa, a region which has been connected to high 7 Be events only by few authors so far [ Hernández et al , ; Dueñas et al , ; Gordo et al , ]. Menut et al [] associated an increase in 7 Be, 210 Pb, and 137 Cs with one intense African dust event in France.…”

Section: Resultsmentioning

confidence: 99%

“…However, Pausata et al [] highlighted Greenland as a high ozone concentration area in spring, an observation which could somehow support the connection of this region with STE events; moreover, surface‐bound diabatically generated low‐level PV anomalies may sometimes come in contact with the low tropopause and merge with stratospheric PV to form a so‐called PV tower [ Rossa et al , ], leading to the occurrence of true STE events over these regions [ Škerlak et al , ]. Also, North Africa turns out as a high PV source area, confirming that this region is connected not only to uplift from the Earth's crust but also to subsidence from the upper troposphere as already reported by Dueñas et al [], thus suggesting that the high 7 Be observation at CMN related to air masses from these regions might be traced back to the upper troposphere. In particular, the seasonal analysis performed over the PV “source regions” (supporting information) shows that North Africa, besides being a 7 Be source region during summer, is an important PV source during both “cold” and “warm” seasons.…”

Section: Resultsmentioning

confidence: 99%

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Influence of stratospheric air masses on radiotracers and ozone over the central Mediterranean

et al. 2017

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This work aims at determining the characteristics and the preferred source regions of stratospheric air masses at the Mt. Cimone World Meteorological Organization‐Global Atmosphere Watch station located in the Italian northern Apennines (44°11′N, 10°42′E, 2165 m above sea level) , a site which is considered representative of Southern Europe‐Mediterranean free troposphere. Source regions of high concentrations of 7Be, 7Be/210Pb, and O3 and regions originating high potential vorticity values are analyzed by means of trajectory statistical methods applied over the time series collected in the period of 1998–2011 to this aim. Our analysis points out the frequent occurrence of stratosphere‐to‐troposphere exchange in the North America and northern Atlantic region, which can be linked to the usual location of the polar‐front and subtropical jet streams in these two regions, but also to the tropopause discontinuity and to the high cyclogenetic activity in the Atlantic region. High 7Be concentrations associated with trajectories of high‐latitude origin descend from high altitudes to the study site, while at midlatitudes trajectories arrive from relatively lower levels. The geographical distribution of the tropopause crossing of air masses before arriving the study site points out particularly to Greenland. Our results also suggest the importance of the interaction between upper level disturbances and the Alps mountain range as a driver for stratosphere‐to‐troposphere exchange. In this case, the time between the tropopause crossing and the arrival at the elevated study site is less than 24 h and frequently below 6 h. The Atlas range in northern Africa plays a similar role though with lower influence.

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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%

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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Air mass origin and its influence on radionuclide activities (7Be and 210Pb) in aerosol particles at a coastal site in the western Mediterranean

Cited by 54 publications

References 41 publications

An outstanding Saharan dust event at Mt. Cimone (2165 m a.s.l., Italy) in March 2004

An outstanding Saharan dust event at Mt. Cimone (2165 m a.s.l., Italy) in March 2004

Influence of stratospheric air masses on radiotracers and ozone over the central Mediterranean

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

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