利用宇宙球粒追踪上层地球大气的氧同位素组成。
Tracing the oxygen isotope composition of the upper Earth's atmosphere using cosmic spherules.
机构信息
Universität Göttingen, Geowissenschaftliches Zentrum, Goldschmidtstraße 1, 37077 Göttingen, Germany.
Karlsruher Institut für Technologie, Institut für Angewandte Materialien - Werkstoffprozesstechnik, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
出版信息
Nat Commun. 2017 Jun 1;8:15702. doi: 10.1038/ncomms15702.
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. Our data suggest that the Earth's atmospheric O is isotopically homogenous up to the thermosphere. This makes fossil I-type micrometeorites ideal proxies for ancient atmospheric CO levels.
熔融 I 型宇宙球粒是由外星 Fe、Ni 金属合金加热、氧化和熔化形成的。这些球粒中的全部氧都来源于大气。因此，I 型宇宙球粒是 80-115 公里高空上层大气同位素组成的合适示踪剂。本文给出了在南极洲采集的 I 型宇宙球粒的数据。将其组成与对流层 O 的组成进行了比较。我们的数据表明，地球大气中的 O 同位素在热层达到均一。这使得化石 I 型微陨石成为古代大气 CO 水平的理想示踪物。
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