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DOI: 10.5445/IR/1000070814

Tracing the oxygen isotope composition of the upper Earth’s atmosphere using cosmic spherules

Pack, Andreas; Höweling, Andres; Hezel, Dominik C.; Stefanak, Maren T.; Beck, Anne-Katrin.; Peters, Stefan T. M.; Sengupta, Sukanya; Herwartz, Daniel; Folco, Luigi

Molten I-type cosmic spherules formed by heating, oxidation and melting of extraterrestrial Fe,Ni metal alloys. The entire oxygen in these spherules sources from the atmosphere. Therefore, I-type cosmic spherules are suitable tracers for the isotopic composition of the upper atmosphere at altitudes between 80 and 115 km. Here we present data on I-type cosmic spherules collected in Antarctica. Their composition is compared with the composition of tropospheric O₂. Our data suggest that the Earth’s atmospheric O₂ is isotopically homogenous up to the thermosphere. This makes fossil I-type micrometeorites ideal proxies for ancient atmospheric CO₂ levels.

Zugehörige Institution(en) am KIT Fakultät für Maschinenbau (MACH)
Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
URN: urn:nbn:de:swb:90-708140
KITopen ID: 1000070814
Erschienen in Nature Communications
Band 8
Seiten Art. Nr.: 15702
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