On carbon burial and net primary production through Earth's history

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ID: 294273
2022
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Abstract
The carbonate carbon isotope record has been traditionally interpreted as evidence of stability in the globally integrated ratio of organic to total carbon burial from Earth9s surface environments over the past ∼3.8 billion years, but recent work has begun to question this conclusion. Herein, we use a reactive-transport modeling approach to track organic carbon oxidation at varying atmospheric oxygen levels and use that information to provide a rough estimate of net primary production through time. Our results support the emerging view that there was extensive variability in the fraction of carbon buried as organic matter (fb,org) throughout Earth9s history. We strengthen the case that the carbonate carbon isotope record has been characterized by a relatively constant baseline value over time due to a fundamental mechanistic link between atmospheric O2 levels and the carbon isotope composition of net inputs to the ocean-atmosphere system. Further, using estimates of the organic carbon burial flux (Fb,org) and the burial efficiency of the carbon pump from our marine reactive-transport modeling, we also support previous work suggesting extensive fluctuation in marine net primary production over time.
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openalex_W4281568571 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Noah J. Planavsky, Mojtaba Fakhraee, Edward W. Bolton, Christopher T. Reinhard, Terry T. Isson, Shuang Zhang, Benjamin Mills
Journal american journal of science
Year 2022
DOI
10.2475/03.2022.01
URL
https://doi.org/10.2475/03.2022.01
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