Greifswald 2024 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Cryosphere and Arctic Oceans
UP 5.5: Vortrag
Mittwoch, 28. Februar 2024, 12:15–12:30, ELP 6: HS 4
Applications of 39Ar-ATTA in Alpine ice samples - surface ages and constraints on diffusion — •Joshua Marks1, David Wachs1,2, Pascal Bohleber3,4, Andrea Fischer3, Yannis Arck1, Martin Stocker3, Susanne Preunkert1,5, Markus Oberthaler2, and Werner Aeschbach1 — 1Institute of Environmental Physics, Heidelberg, Germany — 2Kirchhoff-Institute for Physics, Heidelberg, Germany — 3Institute for Interdisciplinary Mountain Research, Innsbruck, Austria — 4Ca’ Foscari University of Venice, Venice, Italy — 5Institut des Géosciences de l’Environnement (IGE), Grenoble, France
In the study of alpine ice cores, dating with radiometric methods is an important tool. Common tracers used for dating like 3H, 210Pb and 14C do not cover the important age range of several 100 years. 39Ar with its half-life of 269 years is well suited for dating between 50 and 1000 years. However, due to its low abundance of 10-15 a very selective measurement method is needed. This is implemented by the quantum technology of Argon Trap Trace Analysis (ArTTA) which enables ice dating with samples of only few kg of ice.
This work focuses on the further development of the sampling methods and sample preparation for the ArTTA dating tool. Several alpine glaciers have been investigated with surface age profiles. Furthermore, the possible contamination of samples by diffusion of argon into the ice has been addressed and a first estimation of effective magnitude of diffusion was conducted
Keywords: ATTA; alpine; age dating; 39Ar