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

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...

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Bibliographic Details
Published in:Nature Communications
Main Authors: Pack, Andreas, Höweling, Andres, Hezel, Dominik C., Stefanak, Maren T., Beck, Anne-Katrin, Peters, Stefan T. M., Sengupta, Sukanya, Herwartz, Daniel, Folco, Luigi
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
550
Antarc*
Antarctica
Online Access:https://resolver.sub.uni-goettingen.de/purl?gro-2/58894
https://resolver.sub.uni-goettingen.de/purl?gs-1/14540
https://doi.org/10.1038/ncomms15702
Description
Summary: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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