DOI: 10.1016/j.epsl.2018.04.034
Scopus记录号: 2-s2.0-85046474359
论文题名: Mountain ranges, climate and weathering. Do orogens strengthen or weaken the silicate weathering carbon sink?
作者: Maffre P. ; Ladant J.-B. ; Moquet J.-S. ; Carretier S. ; Labat D. ; Goddéris Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 174
结束页码: 185
语种: 英语
英文关键词: erosion
; modeling
; parameter sensitivity
; regression
; weathering
Scopus关键词: Climate change
; Climate models
; Erosion
; Landforms
; Models
; Organic carbon
; Silicates
; Sulfur compounds
; Atmospheric circulation
; Carbon transport
; Erosion conditions
; Geological evolution
; Orders of magnitude
; Parameter sensitivities
; regression
; Silicate weathering
; Weathering
; carbon sink
; climate effect
; climate modeling
; continental lithosphere
; erosion
; mountain region
; orogeny
; regression analysis
; sensitivity analysis
; silicate
; weathering
英文摘要: The role of mountains in the geological evolution of the carbon cycle has been intensively debated for the last decades. Mountains are thought to increase the local physical erosion, which in turns promotes silicate weathering, organic carbon transport and burial, and release of sulfuric acid by dissolution of sulfides. In this contribution, we explore the impact of mountain ranges on silicate weathering. Mountains modify the global pattern of atmospheric circulation as well as the local erosion conditions. Using an IPCC-class climate model, we first estimate the climatic impact of mountains by comparing the present day climate with the climate when all the continents are assumed to be flat. We then use these climate output to calculate weathering changes when mountains are present or absent, using standard expression for physical erosion and a 1D vertical model for rock weathering. We found that large-scale climate changes and enhanced rock supply by erosion due to mountain uplift have opposite effect, with similar orders of magnitude. A thorough testing of the weathering model parameters by data-model comparison shows that best-fit parameterizations lead to a decrease of weathering rate in the absence of mountain by about 20%. However, we demonstrate that solutions predicting an increase in weathering in the absence of mountain cannot be excluded. A clear discrimination between the solutions predicting an increase or a decrease in global weathering is pending on the improvement of the existing global databases for silicate weathering. Nevertheless, imposing a constant and homogeneous erosion rate for models without relief, we found that weathering decrease becomes unequivocal for very low erosion rates (below 10 t/km2/yr). We conclude that further monitoring of continental silicate weathering should be performed with a spatial distribution allowing to discriminate between the various continental landscapes (mountains, plains …). © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109860
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Géosciences Environnement Toulouse, CNRS-IRD-Université Toulouse III, Toulouse, France; Laboratoire des Sciences du Climat et de l'Environnement, CNRS, Gif-sur-Yvette, France; Institut de Physique du Globe de Paris, CNRS, Sorbonne Paris Cité, France
Recommended Citation:
Maffre P.,Ladant J.-B.,Moquet J.-S.,et al. Mountain ranges, climate and weathering. Do orogens strengthen or weaken the silicate weathering carbon sink?[J]. Earth and Planetary Science Letters,2018-01-01,493