Depositional fluxes and other physical characteristics of atmospheric beryllium-7 in the temperate zones (40°N) with a dry (precipitation-free) climate

Papastefanou, C.; Ioannidou, A.

doi:10.1016/0960-1686(91)90108-j

Cited by 42 publications

(155 citation statements)

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“…As already mentioned, the 7 Be specific activity in surface air has been previously studied in relation to some of the chosen variables, but the investigated sets of variables encompassed shorter time periods and contained fewer data points. In that respect, the linear correlations studied in this paper represent novel results.…”

Section: Introductionmentioning

confidence: 99%

“…A notable exception is a 7 Be database compiled in Helsinki, Finland. This database contains measurements of the 7 Be specific activity in surface air between 1987 and 2011, with a total number of measurements larger than 4000. This dataset is stored by the online Radioactivity Environmental Monitoring (REM) Database.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the 7 Be specific activity measured in Helsinki was linearly correlated with the following ten variables: tropopause height; mean, minimum and maximum temperature; precipitation; atmospheric pressure; potential vorticity at 300 hPa and 200 hPa; solar zenith angle; and number of sunspots. As already mentioned, the 7 Be specific activity in surface air has been previously studied in relation to some of the chosen variables, but the investigated sets of variables encompassed shorter time periods and contained fewer data points.…”

Section: Introductionmentioning

confidence: 99%

“…In Europe, the 7 Be measurements have been conducted with a relatively sparse temporal and spatial resolution [18], [19]. A notable exception is a 7 Be database compiled in Helsinki, Finland.…”

Section: Introductionmentioning

confidence: 99%

“…After production, 7 Be attaches to fine aerosols [2]- [4], and its ensuing behaviour in the atmosphere is governed by air mass transport and removal mechanisms [5], [6]. Therefore, 7 Be reaching the surface could be an indicator of a number of atmospheric processes, and indeed, the 7 Be specific activity in surface air has been studied in relation to meteorological variables [7]- [11], solar activity [5], [9], [12], [13], large-scale atmospheric transport [6], [14]- [16], and tropopause height [11], [17].…”

Section: Introductionmentioning

confidence: 99%

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Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Ajtić¹,

Djurdjević²,

Sarvan³

et al. 2016

RAD Conference Proceedings

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Abstract. This analysis presents linear correlations of beryllium-7 specific activity in surface air with several variables measured in Helsinki, Finland, over 1987-2011. Measurements of beryllium-7 are linearly correlated with the following 10 variables: tropopause height; mean, minimum and maximum temperature; precipitation; atmospheric pressure; potential vorticity at 300 hPa and 200 hPa; solar zenith angle; and the number of sunspots. A time lag is also introduced into the calculations of Pearson's linear correlation coefficients, i.e. the beryllium-7 specific activity measured on a day is correlated with a value of a given variable measured on some preceding day. In particular, the time lag is allowed to vary between 0 and 7 days for tropopause height, meteorological parameters and potential vorticity, and between 0 and 31 days for solar zenith angle and number of sunspots. In this way, we obtain sets of correlation coefficients for each pair of the analysed variables, in which we look for the maximum correlation coefficient as well as for the time lag on which this value is reached. In addition to investigating all of the available measurements, the time series are further split into seasonal subsets. Weak to moderate maximum correlation coefficients, ranging between 0.29 and 0.44, are found for the beryllium-7 specific activity with the tropopause height, temperatures and atmospheric pressure. These correlations are reached with a time lag of 0-2 days. Seasonal correlation coefficients show that the strongest linear relationships are obtained in summer. Similarly, a moderate correlation (0.48) with the solar zenith angle is reached with a time lag of 0 days, but the seasonal correlation coefficients in this case show a weaker relationship during different seasons. On the other hand, our analysis suggests that the correlations of beryllium-7 with precipitation, potential vorticity and the number of sunspots are not statistically significant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Ajtić¹,

Djurdjević²,

Sarvan³

et al. 2016

RAD Conference Proceedings

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Seasonal controls on meteoric⁷Be in coarse-grained river channels

et al. 2013

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Cosmogenic 7Be is a natural tracer of short‐term hydrological processes, but its distribution in upland fluvial environments over different temporal and spatial scales has not been well described. We measured 7Be in 450 sediment samples collected from perennial channels draining the middle of the Connecticut River Basin, an environment that is predominantly well‐sorted sand. By sampling tributaries that have natural and managed fluctuations in discharge, we find that the 7Be activity in thalweg sediments is not necessarily limited by the supply of new or fine‐grained sediment, but is controlled seasonally by atmospheric flux variations and the magnitude and frequency of bed mobilizing events. In late winter, 7Be concentrations in transitional bedload are lowest, typically 1 to 3 Bq kg−1 as 7Be is lost from watersheds via radioactive decay in the snowpack. In mid‐summer, however, 7Be concentrations are at least twice as high because of increased convective storm activity which delivers high 7Be fluxes directly to the fluvial system. A mixed layer of sediment at least 8 cm thick is maintained for months in channels during persistent low rainfall and flow conditions, indicating that stationary sediments can be recharged with 7Be. However, bed mobilizing rain on snowmelt events in late Spring can ‘reset’ 7Be amounts and concentrations in the channel as previously buried ‘old’ sediment with low 7Be is mixed into the thalweg. We conclude that given proper temporal and spatial sampling, 7Be is a valuable tracer of seasonal‐timescale mass transport and exchange in coarse‐grained fluvial systems. Copyright © 2013 John Wiley & Sons, Ltd.

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Similarities and Differences in Behavior of 137Cs, 40K and 7Be in Natural Ecosystems

Papastefanou

Manolopoulou

Stoulos

et al.

NATO Security Through Science Series

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Depositional fluxes and other physical characteristics of atmospheric beryllium-7 in the temperate zones (40°N) with a dry (precipitation-free) climate

Cited by 42 publications

References 8 publications

Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Seasonal controls on meteoric⁷Be in coarse-grained river channels

Similarities and Differences in Behavior of 137Cs, 40K and 7Be in Natural Ecosystems

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Depositional fluxes and other physical characteristics of atmospheric beryllium-7 in the temperate zones (40°N) with a dry (precipitation-free) climate

Cited by 42 publications

References 8 publications

Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Beryllium-7 Specific Activity in Surface Air and Its Correlation With Meteorological Variables, Solar Zenith Angle, and Number of Sunspots

Seasonal controls on meteoric7Be in coarse-grained river channels

Similarities and Differences in Behavior of 137Cs, 40K and 7Be in Natural Ecosystems

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Seasonal controls on meteoric⁷Be in coarse-grained river channels