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Osnabrück 2002 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 2: Beschleunigermassenspektrometrie

MS 2.6: Vortrag

Mittwoch, 6. März 2002, 17:45–18:00, HS 02/E04

The origin of 36Cl in modern precipitation — •Vitali Lazarev1, A. Blinov2, Th. Huber1, F. Kubo1, H. Reithmeier1, and E. Nolte11Technische Universität München — 2St. Petersburg Technical University, Russia

The measurements of 36Cl in modern precipitation have shown significantly higher fluxes than those calculated from cosmic ray induced atmospheric production. The discrepancy can be explained by reemitting of the fallen down bomb 36Cl back into the troposphere. The biosphere taking up chlorine and releasing it in form of CH3Cl after decay is discussed to be a suitable storage box.

In order to get more information about distribution of 36Cl fluxes the AMS measurements of water from lakes with long flushing times were performed. 36Cl of different origins like natural production, Chernobyl accident, and bomb tests can be distinguished with the help of theoretical modeling. Also the experiment to collect CH3Cl from the air and to measure 36Cl/Cl is presented. The obtained ratio indicates that the recycling is likely to be the reason of high observed 36Cl fluxes.

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