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DOI | 10.1073/pnas.1721296115 |
Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model | |
Krissansen-Totton, Joshua1,2; Arney, Giada N.2,3,4; Catling, David C.1,2 | |
2018-04-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:16页码:4105-4110 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The early Earth's environment is controversial. Climatic estimates range from hot to glacial, and inferred marine pH spans strongly alkaline to acidic. Better understanding of early climate and ocean chemistry would improve our knowledge of the origin of life and its coevolution with the environment. Here, we use a geological carbon cycle model with ocean chemistry to calculate self-consistent histories of climate and ocean pH. Our carbon cycle model includes an empirically justified temperature and pH dependence of seafloor weathering, allowing the relative importance of continental and seafloor weathering to be evaluated. We find that the Archean climate was likely temperate (0-50 degrees C) due to the combined negative feed-backs of continental and seafloor weathering. Ocean pH evolves monotonically from 6.6(-0.4)(+0.6) (2 sigma) at 4.0 Ga to 7.0(-0.5)(+0.7) (2 sigma) at the Archean-Proterozoic boundary, and to 7.9(-0.2)(+0.1) (2 sigma) at the Proterozoic-Phanerozoic boundary. This evolution is driven by the secular decline of pCO(2), which in turn is a consequence of increasing solar luminosity, but is moderated by carbonate alkalinity delivered from continental and seafloor weathering. Archean seafloor weathering may have been a comparable carbon sink to continental weathering, but is less dominant than previously assumed, and would not have induced global glaciation. We show how these conclusions are robust to a wide range of scenarios for continental growth, internal heat flow evolution and outgassing history, greenhouse gas abundances, and changes in the biotic enhancement of weathering. |
英文关键词 | carbon cycle paleoclimate Precambrian ocean pH weathering |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430191900055 |
WOS关键词 | ISOTOPIC COMPOSITION ; PRECAMBRIAN OCEAN ; MASS-BALANCE ; OXYGEN ; TEMPERATURE ; EVOLUTION ; SEAWATER ; CRUST ; CO2 ; FEEDBACK |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204900 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA; 2.NASA, Virtual Planetary Lab Team, Astrobiol Inst, Seattle, WA 98195 USA; 3.NASA, Planetary Syst Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 4.NASA, Sellers Exoplanet Environm Collaborat, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA |
推荐引用方式 GB/T 7714 | Krissansen-Totton, Joshua,Arney, Giada N.,Catling, David C.. Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(16):4105-4110. |
APA | Krissansen-Totton, Joshua,Arney, Giada N.,&Catling, David C..(2018).Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(16),4105-4110. |
MLA | Krissansen-Totton, Joshua,et al."Constraining the climate and ocean pH of the early Earth with a geological carbon cycle model".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.16(2018):4105-4110. |
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