气候变化领域集成服务门户(CCPortal): Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle

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DOI	10.1016/j.earscirev.2020.103298
	Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle
	Penman D.E.; Caves Rugenstein J.K.; Ibarra D.E.; Winnick M.J.
发表日期	2020
ISSN	0012-8597
卷号	209
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
英文关键词	Atmospheric carbon dioxide; Carbon cycle; Carbon emissions; Earth system modeling; Paleoclimatology; Silicate weathering
语种	英语
scopus关键词	carbon cycle; carbon dioxide; chemical weathering; climate cycle; climate feedback; climate forcing; silicate mineral; surface temperature
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209526
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
推荐引用方式 GB/T 7714	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],2020,209.
APA	Penman D.E.,Caves Rugenstein J.K.,Ibarra D.E.,&Winnick M.J..(2020).Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle.EARTH-SCIENCE REVIEWS,209.
MLA	Penman D.E.,et al."Silicate weathering as a feedback and forcing in Earth's climate and carbon cycle".EARTH-SCIENCE REVIEWS 209(2020).