Processes controlling the seasonal variations in &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Pb and &amp;lt;sup&amp;gt;7&amp;lt;/sup&amp;gt;Be at the Mt. Cimone WMO-GAW global station, Italy: a model analysis

Brattich, Erika; Liu, Hongyu; Tositti, Laura; Considine, David B.

doi:10.5194/acp-17-1061-2017

Cited by 21 publications

(13 citation statements)

References 109 publications

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“…The reason for that are higher temperatures and more dry soils enhancing 222 Rn emanation during this time of the year. Similar seasonal pattern with maximums during the warm season is reported for the Mediterranean coasts in [4] in Spain and at the GAW mountain station at Mt.Cimone in Italy [14]. The monthly variation of 210 Pb in Serbia, reported in [15] for the period 2011-2012, show spring minimum, maximum in November followed by the low values for December and January.…”

Section: Lead-210 Concentration In Tsp Samplessupporting

confidence: 55%

Measurements of Lead-210 Activity Concentration in the Ground-Level Air in Finland and Bulgaria

Paatero¹,

Veleva²,

Hristova³

et al. 2017

RadJ

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Abstract. Airborne lead-210 is a useful tracer for studying air mass origin and transport. 210 Pb is produced in the atmosphere by the decay of the radioactive noble gas 222 Rn, emanating after 226 Ra decay from the earth crust. The results obtained for 210 Pb concentration in total suspended particulate (TSP) display seasonal pattern with maximum in the summer-autumn period. The TSP filters are collected within the scope of atmospheric radioactivity monitoring in NIMH, Bulgaria and were measured initially for short and long lived beta radionuclides. The methodology developed in FMI, Finland, based on gross alpha counting of 210 Po-the daughter of the combined aerosol filters samples collected in Sofia during the period 2001 -2003 and 2006-2007, is applied. The first results for 210 Pb in particulate matter, fraction below 10 μm (PM10), in February 2012 in Sofia are presented. The alpha counting methodology was successfully applied for daily PM10 quartz filters with the counting uncertainty value of ≤20%. Lead-210 daily concentration is compared to the PM10 mass concentration and elemental lead concentration, determined by EDXRF technique. The comparison between 210 Pb, elemental lead and PM10 mass concentration reveals a different time variation for days with cyclonic weather and mass transport from south-west and an anticyclone episode with increasing PM10, lead-210 and lead concentrations from day to day. An increase in the PM10/ 210 Pb ratio indicates local sources of the particulate mass.

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Section: Lead-210 Concentration In Tsp Samplessupporting

confidence: 55%

Measurements of Lead-210 Activity Concentration in the Ground-Level Air in Finland and Bulgaria

Paatero¹,

Veleva²,

Hristova³

et al. 2017

RadJ

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“…We cannot measure this directly based on isotopes. What we see and describe is the systematic changes and trends of beryllium-7 concentrations during the last 1-2 decades, presumably caused by gradual changes in circulation patterns 19,29 .…”

Section: Radioisotopes Demonstrate Changes In Global Atmospheric Circmentioning

confidence: 73%

Radioisotopes demonstrate changes in global atmospheric circulation possibly caused by global warming

Terzi

Wotawa

Schoeppner

et al. 2020

Sci Rep

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In this paper, we present a new method to study global atmospheric processes and their changes during the last decade. A cosmogenic radionuclide measured at ground-level, beryllium-7, is utilized as a proxy to study atmospheric dynamics. Beryllium-7 has two advantages: First, this radionuclide, primarily created in the lower stratosphere, attaches to aerosols that are transported downwards to the troposphere and travel around the globe with the general atmospheric circulation. By monitoring these particles, we can provide a global, simple, and sustainable way to track processes such as multi-annual variation of the troposphere, tropopause heightening, position and speed of atmospheric interface zones, as well as the poleward movement and stalling patterns of jet streams. Second, beryllium-7 is a product of cosmic rays which are themselves directly linked to solar activity and the earth magnetic field. This study shows whether beryllium-7 observed concentration changes are correlated with such natural processes or independent of them. Our work confirms that major changes in the atmospheric circulation are currently ongoing, even though timeseries are too short to make climatological assessments. We provide solid evidence of significant and progressive changes of the global atmospheric circulation as well as modifications of tropopause heights over the past decade. As the last decade happened to be the warmest on record, this analysis also indicates that the observed changes are, at least to some extent, attributable to global warming.

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“…However, potential errors in the individual trajectories are averaged out when considering a large number of back trajectories over a long‐time period. In addition, our results are further limited from the coarse resolution of the meteorological database used in the back trajectory calculation over a region having a complex topography, similar to the previous work of [ Brattich et al , ] at the same sampling site. In fact, Mt.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2017

Self Cite

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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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Processes controlling the seasonal variations in <sup>210</sup>Pb and <sup>7</sup>Be at the Mt. Cimone WMO-GAW global station, Italy: a model analysis

Cited by 21 publications

References 109 publications

Measurements of Lead-210 Activity Concentration in the Ground-Level Air in Finland and Bulgaria

Measurements of Lead-210 Activity Concentration in the Ground-Level Air in Finland and Bulgaria

Radioisotopes demonstrate changes in global atmospheric circulation possibly caused by global warming

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

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