Temporal changes of 7Be, 137Cs and 210Pb activity concentrations in surface air at Monaco and their correlation with meteorological parameters

Pham, Mai Khanh; Betti, M.; Nies, H.; Povinec, P.

doi:10.1016/j.jenvrad.2011.06.002

Cited by 86 publications

(42 citation statements)

References 63 publications

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“…The 137 Cs present in the atmosphere mainly from global fallout and the Chernobyl accident has primarily been deposited on the earth's surface, including the ocean by wet and dry deposition (Pham et al, 2011a(Pham et al, , 2013.…”

Section: Cesium-137mentioning

confidence: 99%

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

et al. 2013

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Abstract. Radionuclide impact of the Fukushima Dai-ichi nuclear power plant accident on the distribution of radionuclides in seawater of the NW Pacific Ocean is compared with global fallout from atmospheric tests of nuclear weapons. Surface and water column samples collected during the Ka'imikai-o-Kanaloa (KOK) international expedition carried out in June 2011 were analyzed for 134Cs, 137Cs, 129I and 3H. The 137Cs, 129I and 3H levels in surface seawater offshore Fukushima varied between 0.002–3.5 Bq L−1, 0.01–0.8 μBq L−1, and 0.05–0.15 Bq L−1, respectively. At the sampling site about 40 km from the coast, where all three radionuclides were analyzed, the Fukushima impact on the levels of these three radionuclides represents an increase above the global fallout background by factors of about 1000, 50 and 3, respectively. The water column data indicate that the transport of Fukushima-derived radionuclides downward to the depth of 300 m has already occurred. The observed 137Cs levels in surface waters and in the water column are compared with predictions obtained from the ocean general circulation model, which indicates that the Kuroshio Current acts as a southern boundary for the transport of the radionuclides, which have been transported from the Fukushima coast eastward in the NW Pacific Ocean. The 137Cs inventory in the water column is estimated to be about 2.2 PBq, what can be regarded as a lower limit of the direct liquid discharges into the sea as the seawater sampling was carried out only in the area from 34 to 37° N, and from 142 to 147° E. About 4.6 GBq of 129I was deposited in the NW Pacific Ocean, and 2.4–7 GBq of 129I was directly discharged as liquid wastes into the sea offshore Fukushima. The total amount of 3H released and deposited over the NW Pacific Ocean was estimated to be 0.1–0.5 PBq. These estimations depend, however, on the evaluation of the total 137Cs activities released as liquid wastes directly into the sea, which should improve when more data are available. Due to a suitable residence time in the ocean, Fukushima-derived radionuclides will provide useful tracers for isotope oceanography studies on the transport of water masses during the next decades in the NW Pacific Ocean.

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Section: Cesium-137mentioning

confidence: 99%

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

et al. 2013

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“…The changes in temperatures and atmospheric pressure were mirrored by changes in 7 Be within the same day and two days later, respectively. On the other hand, the correlation coefficients implied no linear correlation with precipitation, which is considered a major removal process of 7 Be from the atmosphere [7], [9], [26].…”

Section: Methodsmentioning

confidence: 91%

“…For example, a linear correlation coefficient of ~0.50 for the 7 Be specific activity in surface air and temperature, was reported for Málaga, Spain [3] and Monaco [9]. Correlation coefficients for other meteorological variables, though, were not as consistent -while in Málaga, the 7 Be surface concentration was anticorrelated with precipitation and relative humidity [3], the Monaco records showed no statistically significant linear correlation [9].…”

Section: Methodsmentioning

confidence: 98%

“…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%

“…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.…”

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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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Temporal variations of atmospheric depositional fluxes of ⁷Be and ²¹⁰Pb over 8 years (2006–2013) at Shanghai, China, and synthesis of global fallout data

Baskaran²,

et al. 2015

JGR Atmospheres

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7Be and 210 Pb, two atmospherically delivered radionuclides, have been broadly applied to study the processes including air mass transport, soil erosion, and particle cycling in aqueous systems. These studies require temporal variations of their depositional fluxes. In the present work, monthly atmospheric bulk depositional fluxes of Pb. There were strong seasonal variations in the depositional fluxes of these nuclides. The seasonal fraction of depositional fluxes was >30% of the total annual depositional fluxes of Pb depositional fluxes increase with the distance from the coast in inland regions (distance from the coast >50 km) and increase with the amount of precipitation in onshore region (distance from the coast ≤50 km). We also report that Shanghai, China, has the second highest bulk depositional fluxes of 210 Pb in literature.

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Temporal changes of 7Be, 137Cs and 210Pb activity concentrations in surface air at Monaco and their correlation with meteorological parameters

Cited by 86 publications

References 63 publications

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

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

Temporal variations of atmospheric depositional fluxes of ⁷Be and ²¹⁰Pb over 8 years (2006–2013) at Shanghai, China, and synthesis of global fallout data

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Temporal changes of 7Be, 137Cs and 210Pb activity concentrations in surface air at Monaco and their correlation with meteorological parameters

Cited by 86 publications

References 63 publications

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

Cesium, iodine and tritium in NW Pacific waters – a comparison of the Fukushima impact with global fallout

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

Temporal variations of atmospheric depositional fluxes of 7Be and 210Pb over 8 years (2006–2013) at Shanghai, China, and synthesis of global fallout data

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Temporal variations of atmospheric depositional fluxes of ⁷Be and ²¹⁰Pb over 8 years (2006–2013) at Shanghai, China, and synthesis of global fallout data