Origin of observed high 7Be and mineral dust concentrations in ambient air on the Island of Tenerife

Hernández, Francisco; Rodrı́guez, Sergio; Karlsson, Linn; Alonso-Pérez, Silvia; López‐Pérez, María; Hernández-Armas, J.; Cuevas, E.

doi:10.1016/j.atmosenv.2008.01.017

Cited by 37 publications

(11 citation statements)

References 21 publications

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“…Our present results are in good agreement with previous studies by Hernández et al [2008], Menut et al [2009], Dueñas et al [2011], andGordo et al [2015], 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: Source Areas Of Atmospheric Radiotracers and Ozonesupporting

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%

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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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Section: Source Areas Of Atmospheric Radiotracers and Ozonesupporting

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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“…No strong correlation between 7 Be and 210 Pb concentrations in aerosols is found (Figure 8, unlike in the precipitation samples (Figure 3)). Although the 7 Be concentration in aerosol may be independent of the sources of air masses (maritime versus continental) to the sampling site, the 210 Pb concentration will be very sensitive to the sources of air masses [ Carvalho , 1995; Hernández et al , 2008], and hence if the fractional amount of oceanic air mass changes, the 210 Pb concentration in aerosols will also change, while 7 Be may not change and hence the linear relationship between 210 Pb and 7 Be in aerosol samples is expected to be weak. The washout of 7 Be and 210 Pb during precipitation is from the bottom of the cloud layer to Earth surface and the differences in the sources of air masses for the whole air column will affect 210 Pb much less compared to the surface layer (where the aerosols were collected) and thus, there is a stronger correlation between 210 Pb and 7 Be in precipitation.…”

Section: Resultsmentioning

confidence: 99%

Depositional fluxes and concentrations of⁷Be and²¹⁰Pb in bulk precipitation and aerosols at the interface of Atlantic and Mediterranean coasts in Spain

et al. 2011

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Bulk depositional fluxes of 7Be and 210Pb in precipitation measured over a period of 16 months (April 2009–July 2010) in Huelva, Spain varied between 5.6 and 186 Bq m−2 month−1 (annual mean: 834 Bq m−2 year−1) and 0.8 and 8.1 Bq m−2 month−1 (annual mean: 59 Bq m−2 year−1), respectively, with the lowest depositional fluxes occurring during dry summer months. Quantitative evaluation of the precipitation‐normalized seasonal depositional fluxes of 7Be and 210Pb indicates that the enrichment factor in winter is < 1.0 while in 2010 spring, it is significantly higher than 1, possibly indicating input of air from the stratosphere‐troposphere exchange (for 7Be). The specific activities of 7Be and 210Pb varied from 0.03 to 7.42 Bq L−1 (mean = 2.5 Bq L−1) and 0.005 to 1.07 BqL−1 (mean = 0.23 Bq L−1), respectively, with the highest values corresponding to the spring season. The spatial and temporal variations of 7Be and 210Pb in aerosols from three stations are evaluated and compared to their monthly depositional fluxes. The mean depositional velocity of aerosols using 7Be and 210Pb are similar, ∼0.5 cm s−1 and are compared to other published values. This is the first time the fractional amounts of 7Be and 210Pb in monthly bulk precipitation are compared to the fractional amount of precipitation and provides insight on how the amount of precipitation plays a key role on the scavenging of these nuclides. The importance of dry fallout is evaluated for the study site which has direct implications for other areas in the Mediterranean Climate Zone.

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“…It should be noted however that for the prevailing summer-winter conditions the Judean Desert 7 Be flux estimated in this study is close to the flux estimated for Damascus. The variations between the sites may stem from storm variability that affect the atmospheric 7 Be flux [Hernandez et al, 2008].…”

Section: Mass-balance Model Of 7 Be Dry Deposition In the Dead Sea Drmentioning

confidence: 99%

Short residence time and fast transport of fine detritus in the Judean Desert: Clues from⁷Be in settled dust

Belmaker¹,

Lazar

Stein³

et al. 2011

Geophys. Res. Lett.

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The cosmogenic isotope 7Be (t1/2 = 53.3d) was measured in sediments collected from dust traps deployed in the Judean Desert which is part of the Dead Sea drainage basin. The results show that (a) the 7Be dry deposition flux in the Dead Sea region is 2.0 ± 0.6 × 104 atoms cm−2 y−1 during summer and winter and 5.3 ± 0.7 × 104 atoms cm−2 y−1 during fall; (b) the residence time of dust in the Dead Sea drainage basin is less than one year; (c) the recycled component of the cosmogenic isotope 10Be (t1/2 = 1.39 106y) in Judean desert dust is potentially small; and (d) the 7Be inventory (atoms cm−2) in dust settled in the drainage basin did not reach steady state between consecutive rare events of desert winter floods suggesting a short transport rate of fine detritus material from the marginal terraces into the Dead Sea. Provided 10Be behaves similarly (as implied by the common geochemistry and cosmogenic origin of 7Be and 10Be), we suggest 10Be in Lake Lisan (Pleistocene Dead Sea) detrital sediments as a potential proxy for paleo‐flood frequency and dust transport.

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Origin of observed high 7Be and mineral dust concentrations in ambient air on the Island of Tenerife

Cited by 37 publications

References 21 publications

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

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

Depositional fluxes and concentrations of⁷Be and²¹⁰Pb in bulk precipitation and aerosols at the interface of Atlantic and Mediterranean coasts in Spain

Short residence time and fast transport of fine detritus in the Judean Desert: Clues from⁷Be in settled dust

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Origin of observed high 7Be and mineral dust concentrations in ambient air on the Island of Tenerife

Cited by 37 publications

References 21 publications

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

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

Depositional fluxes and concentrations of7Be and210Pb in bulk precipitation and aerosols at the interface of Atlantic and Mediterranean coasts in Spain

Short residence time and fast transport of fine detritus in the Judean Desert: Clues from7Be in settled dust

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Depositional fluxes and concentrations of⁷Be and²¹⁰Pb in bulk precipitation and aerosols at the interface of Atlantic and Mediterranean coasts in Spain

Short residence time and fast transport of fine detritus in the Judean Desert: Clues from⁷Be in settled dust