Atmospheric Nitrogen When Life Evolved on Earth.

التفاصيل البيبلوغرافية
العنوان:	Atmospheric Nitrogen When Life Evolved on Earth.
المؤلفون:	Gebauer S; Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany., Grenfell JL; Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany., Lammer H; Space Research Institute, Austrian Academy of Sciences, Graz, Austria., de Vera JP; Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany., Sproß L; Space Research Institute, Austrian Academy of Sciences, Graz, Austria.; Institute for Physics, University of Graz, Graz, Austria., Airapetian VS; NASA Goddard Space Flight Center (GSFC), Greenbelt, Maryland, USA.; American University, NW Washington, District of Columbia, USA., Sinnhuber M; Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany., Rauer H; Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany.; Institute for Geological Sciences, Planetology and Remote Sensing, Freie Universität Berlin (FUB), Berlin, Germany.; Centre for Astronomy and Astrophysics, Technische Universität Berlin (TUB), Berlin, Germany.
المصدر:	Astrobiology [Astrobiology] 2020 Dec; Vol. 20 (12), pp. 1413-1426. Date of Electronic Publication: 2020 Oct 29.
نوع المنشور:	Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
اللغة:	English
بيانات الدورية:	Publisher: Mary Ann Liebert, Inc Country of Publication: United States NLM ID: 101088083 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1557-8070 (Electronic) Linking ISSN: 15578070 NLM ISO Abbreviation: Astrobiology Subsets: MEDLINE
أسماء مطبوعة:	Original Publication: Larchmont, N.Y. : Mary Ann Liebert, Inc., c2001-
مواضيع طبية MeSH:	Earth, Planet* , Nitrogen/chemistry , Origin of Life, Atmosphere/*chemistry, Oxidation-Reduction
مستخلص:	The amount of nitrogen (N 2 ) present in the atmosphere when life evolved on our planet is central for understanding the production of prebiotic molecules and, hence, is a fundamental quantity to constrain. Estimates of atmospheric molecular nitrogen partial surface pressures during the Archean, however, widely vary in the literature. In this study, we apply a model that combines newly gained insights into atmospheric escape, magma ocean duration, and outgassing evolution. Results suggest <420 mbar surface molecular nitrogen at the time when life originated, which is much lower compared with estimates in previous works and hence could impact our understanding of the production rate of prebiotic molecules such as hydrogen cyanide. Our revised values provide new input for atmospheric chamber experiments that simulate prebiotic chemistry on the early Earth. Our results that assume negligible nitrogen escape rates are in agreement with research based on solidified gas bubbles and the oxidation of iron in micrometeorites at 2.7 Gyr ago, which suggest that the atmospheric pressure was probably less than half the present-day value. Our results contradict previous studies that assume N 2 partial surface pressures during the Archean were higher than those observed today and suggest that, if the N 2 partial pressure were low in the Archean, it would likely be low in the Hadean as well. Furthermore, our results imply a biogenic nitrogen fixation rate from 9 to 14 Teragram N 2 per year (Tg N 2 /year), which is consistent with modern marine biofixation rates and, hence, indicate an oceanic origin of this fixation process.
فهرسة مساهمة:	Keywords: Atmosphere; Escape; Evolution; Life; Nitrogen; Outgassing
المشرفين على المادة:	N762921K75 (Nitrogen)
تواريخ الأحداث:	Date Created: 20201030 Date Completed: 20210921 Latest Revision: 20210921
رمز التحديث:	20221213
DOI:	10.1089/ast.2019.2212
PMID:	33121251
قاعدة البيانات:	MEDLINE

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