Long-term variations of p>14p>C and p>137p>Cs in the Bratislava air - implications of different atmospheric transport processes

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• 作者：P.P. Povinecp> ; p>p>Povinec@gmail.comp> ; K. Holý ; M. Chudý ; A. &Scaron ; ivo ; I. Sý ; kora ; M. Je&scaron ; kovský ; M. Richt&aacute ; rikov&aacute
• 关键词：Atmosphere ; Carbon dioxide ; Global fallout ; Suess effect ; Resuspension from soil ; Bratislava air
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：June, 2012
• 卷：108
• 期：Complete
• 页码：33-40
• 文件大小：817 K

摘要

This study summarizes measurements of atmospheric p>14p>C and p>137p>Cs in the Bratislava air since 1976. Higher p>14p>C levels observed in spring and early summer months until the 1980鈥檚 confirm injection of the stratospheric air into the troposphere. Later, deep winter minima were observed in p>14p>C concentrations, probably due to the depletion of the atmospheric p>14p>C levels in winter months by the injection of large quantities of fossil CO₂. Presently observed p>14p>C maxima in summer and minima in winter were caused by the depletion of the atmospheric p>14p>C in winter months, amplified by temperature inversions during winter, rather than by the injection of the stratospheric air into the troposphere. The observed p>137p>Cs activity concentrations also showed an impact of the stratospheric air on the p>137p>Cs levels until the early 1980鈥檚, documented by typical spring/early summer maxima and winter minima. The global fallout p>137p>Cs record was then disturbed by the Chernobyl accident (1986) when large quantities of p>137p>Cs were released to the atmosphere. The recent p>137p>Cs variations observed in the atmosphere, characterised by winter maxima and summer minima, are assumed to be mainly due to the resuspension of p>137p>Cs from the soil. A correlation was found between the p>137p>Cs activity concentration and the dust level in the air (the correlation coefficient r聽=聽0.74), as well as an anticorrelation with the temperature (r聽=聽鈭?.56).