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Article: Evolution of the Global Carbon Cycle and Climate Regulation on Earth

TitleEvolution of the Global Carbon Cycle and Climate Regulation on Earth
Authors
KeywordsCarbon Cycle
Climate
Weathering
Reverse Weathering
Degassing
Issue Date2020
PublisherAmerican Geophysical Union.
Citation
Global Biogeochemical Cycles, 2020, v. 34 n. 2, p. article no. e2018GB006061 How to Cite?
AbstractThe existence of stabilizing feedbacks within Earth's climate system is generally thought to be necessary for the persistence of liquid water and life. Over the course of Earth's history, Earth's atmospheric composition appears to have adjusted to the gradual increase in solar luminosity, resulting in persistently habitable surface temperatures. With limited exceptions, the Earth system has been observed to recover rapidly from pulsed climatic perturbations. Carbon dioxide (CO2) regulation via negative feedbacks within the coupled global carbon‐silica cycles are classically viewed as the main processes giving rise to climate stability on Earth. Here we review the long‐term global carbon cycle budget, and how the processes modulating Earth's climate system have evolved over time. Specifically, we focus on the relative roles that shifts in carbon sources and sinks have played in driving long‐term changes in atmospheric pCO2. We make the case that marine processes are an important component of the canonical silicate weathering feedback, and have played a much more important role in pCO2 regulation than traditionally imagined. Notably, geochemical evidence indicate that the weathering of marine sediments and off‐axis basalt alteration act as major carbon sinks. However, this sink was potentially dampened during Earth's early history when oceans had higher levels of dissolved silicon (Si), iron (Fe), and magnesium (Mg), and instead likely fostered more extensive carbon recycling within the ocean‐atmosphere system via reverse weathering—that in turn acted to elevate ocean‐atmosphere CO2 levels.
Persistent Identifierhttp://hdl.handle.net/10722/290562
ISSN
2020 Impact Factor: 5.703
2020 SCImago Journal Rankings: 2.512
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorIsson, TT-
dc.contributor.authorPlanavsky, NJ-
dc.contributor.authorCoogan, LA-
dc.contributor.authorStewart, EM-
dc.contributor.authorAgue, JJ-
dc.contributor.authorBolton, EW-
dc.contributor.authorZhang, S-
dc.contributor.authorMc Kenzie, NR-
dc.contributor.authorKump, LR-
dc.date.accessioned2020-11-02T05:44:00Z-
dc.date.available2020-11-02T05:44:00Z-
dc.date.issued2020-
dc.identifier.citationGlobal Biogeochemical Cycles, 2020, v. 34 n. 2, p. article no. e2018GB006061-
dc.identifier.issn0886-6236-
dc.identifier.urihttp://hdl.handle.net/10722/290562-
dc.description.abstractThe existence of stabilizing feedbacks within Earth's climate system is generally thought to be necessary for the persistence of liquid water and life. Over the course of Earth's history, Earth's atmospheric composition appears to have adjusted to the gradual increase in solar luminosity, resulting in persistently habitable surface temperatures. With limited exceptions, the Earth system has been observed to recover rapidly from pulsed climatic perturbations. Carbon dioxide (CO2) regulation via negative feedbacks within the coupled global carbon‐silica cycles are classically viewed as the main processes giving rise to climate stability on Earth. Here we review the long‐term global carbon cycle budget, and how the processes modulating Earth's climate system have evolved over time. Specifically, we focus on the relative roles that shifts in carbon sources and sinks have played in driving long‐term changes in atmospheric pCO2. We make the case that marine processes are an important component of the canonical silicate weathering feedback, and have played a much more important role in pCO2 regulation than traditionally imagined. Notably, geochemical evidence indicate that the weathering of marine sediments and off‐axis basalt alteration act as major carbon sinks. However, this sink was potentially dampened during Earth's early history when oceans had higher levels of dissolved silicon (Si), iron (Fe), and magnesium (Mg), and instead likely fostered more extensive carbon recycling within the ocean‐atmosphere system via reverse weathering—that in turn acted to elevate ocean‐atmosphere CO2 levels.-
dc.languageeng-
dc.publisherAmerican Geophysical Union.-
dc.relation.ispartofGlobal Biogeochemical Cycles-
dc.rightsGlobal Biogeochemical Cycles. Copyright © American Geophysical Union.-
dc.rights©[2020]. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1029/2018GB006061-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectCarbon Cycle-
dc.subjectClimate-
dc.subjectWeathering-
dc.subjectReverse Weathering-
dc.subjectDegassing-
dc.titleEvolution of the Global Carbon Cycle and Climate Regulation on Earth-
dc.typeArticle-
dc.identifier.emailMc Kenzie, NR: ryan00@hku.hk-
dc.identifier.authorityMc Kenzie, NR=rp02198-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2018GB006061-
dc.identifier.scopuseid_2-s2.0-85081116969-
dc.identifier.hkuros318402-
dc.identifier.volume34-
dc.identifier.issue2-
dc.identifier.spagearticle no. e2018GB006061-
dc.identifier.epagearticle no. e2018GB006061-
dc.identifier.isiWOS:000520158900001-
dc.publisher.placeUnited States-
dc.identifier.issnl0886-6236-

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