Erlangen 2018 – wissenschaftliches Programm
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 (t1/2 = 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.