DOI: 10.1016/j.earscirev.2020.103298
论文题名: Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle
作者: Penman D.E. ; Caves Rugenstein J.K. ; Ibarra D.E. ; Winnick M.J.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 209 语种: 英语
中文关键词: Atmospheric carbon dioxide
; Carbon cycle
; Carbon emissions
; Earth system modeling
; Paleoclimatology
; Silicate weathering
英文关键词: carbon cycle
; carbon dioxide
; chemical weathering
; climate cycle
; climate feedback
; climate forcing
; silicate mineral
; surface temperature
英文摘要: Current understanding of the long-term carbon cycle posits that Earth's climate is stabilized by a negative feedback involving CO2 consumption by chemical weathering of silicate minerals. This theory holds that silicate weathering responds to climate: when atmospheric pCO2 and surface temperatures rise, chemical weathering accelerates, consuming more atmospheric CO2 and cooling global climate; when pCO2 falls, weathering fluxes decrease, permitting buildup of CO2 and consequent warming. However, the functional dependence of global weathering rates on atmospheric pCO2 (Earth's “weathering curve”) remains highly uncertain, with a variety of mathematical formulations proposed in the literature. We explore the factors influencing this relationship, and how they may have changed over Earth history. We then revisit classic carbon cycle model experiments to demonstrate how the choice of weathering curve has dramatic consequences for the response of the Earth system to several types of climatic and carbon-cycle perturbations. First, the slope of the weathering curve determines the timescale of recovery and the “long tail” of elevated pCO2 following carbon release events. Second, the nature of Earth's weathering curve determines the response of pCO2 to changing volcanic CO2 degassing, which has varied significantly over geologic timescales. Finally, we demonstrate how changes to Earth's weathering curve over time driven by, for example, tectonic or evolutionary processes, can act as a forcing, in addition to a feedback, in the carbon cycle and climate. These examples highlight the importance of constraining Earth's weathering curve, both for improving our understanding of past carbon cycle perturbations and predicting the future impact of anthropogenic carbon release on long timescales. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166214
Appears in Collections: 气候变化与战略
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作者单位: DepartmentDepartment of Geosciences, Utah State University, Logan, UT 84321, United States; Department of Geology & Geophysics, Yale University, New Haven, CT 06511, United States; Department of Earth Sciences, ETH Zürich, Zürich, 8092, Switzerland; Department of Geological Sciences, Stanford University, Stanford, CA 94305, United States; Department of Geosciences, University of Massachusetts, Amherst, MA 01003, United States
Recommended Citation:
Penman D.E.,Caves Rugenstein J.K.,Ibarra D.E.,et al. Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle[J]. Earth Science Reviews,2020-01-01,209