Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Accelerator Mass Spectrometry 1

MS 5.3: Vortrag

Mittwoch, 7. März 2018, 14:45–15:00, R 1.020

The Flux of Interplanetary Dust on Earth: Status. — •David Krieg¹, Christoph Busser¹, Thomas Faestermann¹, Leticia Fimiani¹, J. M. Gomez-Guzman¹, Angelina Kinast¹, Dominik Koll¹, Gunther Korschinek¹, Manuel Lebert¹, Silke Merchel², Jan Welch³, and Sepp Kipfstuhl⁴ — ¹Technische Universität München, Garching, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³Atominstitut of the Technischen Universität Wien, Vienna, Austria — ⁴Alfred-Wegener-Institut, Bremerhaven, Germany

Earth’s accumulation rate of Interplanetary Dust Particles (IDPs) is a matter of discussion, ranging from 5 (middle atmosphere measurements) up to 300 (space borne dust detection) tons per day.
A new approach for a more precise measurement of this accumulation rate is made by extracting manganese from 500 kg of Antarctic snow collected near the Kohnen station, and measuring the concentration of ⁵³Mn with AMS at the MLL in Munich.
This ⁵³Mn (t_1/2 = 3,7 Ma) is mostly produced by nuclear reactions of cosmic rays on the iron of the IDPs. Relating the amount of ⁵³Mn to the precipitation rate, a meridional transport and deposition model based on ¹⁰Be measurements, and to a chemical model of meteoritic ablation will help to reduce the uncertainty of the IDP input on Earth. The method of our measurement and the status of this study will be discussed.