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 O 2. Our data suggest that the Earth's atmospheric O 2 is isotopically homogenous up to the thermosphere. This makes fossil I-Type micrometeorites ideal proxies for ancient atmospheric CO 2 levels.

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

Folco L.
2017

Abstract

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 O 2. Our data suggest that the Earth's atmospheric O 2 is isotopically homogenous up to the thermosphere. This makes fossil I-Type micrometeorites ideal proxies for ancient atmospheric CO 2 levels.
Pack, A.; Höweling, A.; Hezel, D. C.; Stefanak, M. T.; Beck, A-K; Peters, S. T. M.; Sengupta, S.; Herwartz, D.; Folco, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/881005
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