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
8: 15702 - 15702
DOI: https://doi.org/10.1038/ncomms15702
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7054
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7054
Pack, Andreas; Höweling, Andres; Hezel, Dominik C.; Stefanak, Maren T.; Beck, Anne-Katrin; Peters, Stefan T. M.; Sengupta, Sukanya; Herwartz, Daniel; Folco, Luigi, 2017: Tracing the oxygen isotope composition of the upper Earth's atmosphere using cosmic spherules. In: Nature communications, Band 8: 15702 - 15702, DOI: 10.1038/ncomms15702.
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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.
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