دورية أكاديمية
On seasonal variations of radiocesium speciation in the surface sediments of Lake Juodis, Lithuania
| العنوان: | On seasonal variations of radiocesium speciation in the surface sediments of Lake Juodis, Lithuania |
|---|---|
| المؤلفون: | Tarasiuk, Nikolaj, Koviazina, Eva, Kubarevičienė, Vaida |
| المصدر: | Journal of environmental radioactivity, 2008, Vol. 99, iss. 1, p. 199-210 ; ISSN 0265-931X |
| سنة النشر: | 2008 |
| المجموعة: | LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) / LAEI VB (Lietuvos agrarinės ekonomikos institutasvirtualią biblioteką) |
| مصطلحات موضوعية: | Radiocesium, Lake, Sediments, Speciation, Seasonal variations, Remobilization |
| الوصف: | Data on radiocesium speciation measured seasonally in black silt surface sediments in the shallow terrace and in the deepest southern part of Lake Juodis (Lithuania) in 2004-2005 are presented. It is shown that seasonal variations of radiocesium exchangeable fractions in the sediments in the shallow terrace are mainly related to its redistribution due to the vital cycle of green algae covering bottom surfaces - processes of their growth and decomposition. A seasonal course of those fractions in surface sediments of the deepest bottom areas of the lake follows a distinct pattern and is annually recycling. It is maximum in winter and declines due to stagnant bottom water zone disruption in summer. It is shown that surface sediments in the deepest bottom areas of the lake are not a radiocesium source during the formation of the anaerobic zone in bottom water in winter, and act in that case as its acceptor. The radiocesium remobilization to the bottom water is seasonal and site-specific. It is suggested to be due to three main processes: its diffusion from deeper and more active sediments, its redistribution during decomposition of organics freshly accumulated in surface sediments and a radiocesium flux induced by the mechanism of the seasonal anaerobic zone formation in near-bottom water. 2007 Elsevier Ltd. All rights reserved. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://ftmc.lvb.lt/FTMC:ELABAPDB6055945&prefLang=en_USTest |
| الإتاحة: | https://doi.org/10.1016/j.jenvrad.2007.10.014Test http://ftmc.lvb.lt/FTMC:ELABAPDB6055945&prefLang=en_USTest |
| رقم الانضمام: | edsbas.B379701E |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |