Hannover 2003 – scientific programme
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MS: Massenspektrometrie
MS 1: Beschleunigermassenspektrometrie
MS 1.6: Talk
Monday, March 24, 2003, 15:15–15:30, F 428
Application of 36Cl for hydrology — •Vitali Lazarev1, Alexander Blinov2, Thomas Huber1, Herbert Reithmeier1, and Eckehart Nolte1 — 1Technische Universität München — 2Technical University, St. Petersburg, Russia
In order to investigate the distribution of the 36Cl fallout, measurements of the 36Cl concentration in a number of lakes over the globe were performed. In dependence on the flushing time (the ratio of volume of a lake to runoff of its outlet), the main sources of 36Cl are the natural production due to cosmic rays and the bomb production due to water nuclear tests. In central and eastern parts of Europe 36Cl released by Chernobyl accident dominates. With help of modeling, it is possible to distinguish the contributions of these sources.
The sharp form of Chernobyl input allows determination of flushing times if they are in the range of 2-10 years. It can be seen that theoretical flushing times are typically lower than the renewal times, which are determined by means of radionuclides. This happens due to the ground water, which plays an important role in the salt balance. The bomb input can be used to study the mixing dynamic in lakes with long flushing times (e.g. Baikal). The natural production of 36Cl can be applied to investigate the closure time of salty lakes, which became isolated less than one million years ago (e.g. Issyk-Kul).