Pulsed carbon export from mountains by earthquake-triggered landslides explored in a reduced-complexity model

doi:10.5194/esurf-9-823-2021

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	Pulsed carbon export from mountains by earthquake-triggered landslides explored in a reduced-complexity model
	Croissant, Thomas 1; Hilton, Robert G.1; Li, Gen K.2; Howarth, Jamie 3; Wang, Jin 1,5; Harvey, Erin L.1,6; Steer, Philippe 4; Densmore, Alexander L.1
通讯作者	Croissant, Thomas(thomas.croissant@durham.ac.uk)
	2021-08-02
发表期刊	EARTH SURFACE DYNAMICS
ISSN	2196-6311
卷号	9 期号:4 页码:823-844
摘要	In mountain ranges, earthquakes can trigger widespread landsliding and mobilize large amounts of organic carbon by eroding soil and vegetation from hillslopes. Following a major earthquake, the landslide-mobilized organic carbon can be exported from river catchments by physical sediment transport processes or stored within the landscape where it may be degraded by heterotrophic respiration. The competition between these physical and biogeochemical processes governs a net transfer of carbon between the atmosphere and sedimentary organic matter, yet their relative importance following a large landslide-triggering earthquake remains poorly constrained. Here, we propose a model framework to quantify the post-seismic redistribution of soil-derived organic carbon. The approach combines predictions based on empirical observations of co-seismic sediment mobilization with a description of the physical and biogeochemical processes involved after an earthquake. Earthquake-triggered landslide populations are generated by randomly sampling a landslide area distribution, a proportion of which is initially connected to the fluvial network. Initially disconnected landslide deposits are transported downslope and connected to rivers at a constant velocity in the post-seismic period. Disconnected landslide deposits lose organic carbon by heterotrophic oxidation, while connected deposits lose organic carbon synchronously by both oxidation and river export. The modeling approach is numerically efficient and allows us to explore a large range of parameter values that exert a control on the fate of organic carbon in the upland erosional system. We explore the role of the climatic context (in terms of mean annual runoff and runoff variability) and rates of organic matter degradation using single pool and multi-pool models. Our results highlight the fact that the redistribution of organic carbon is strongly controlled by the annual runoff and the extent of landslide connection, but less so by the choice of organic matter degradation model. In the context of mountain ranges typical of the southwestern Pacific region, we find that model configurations allow more than 90 % of the landslide-mobilized carbon to be exported from mountain catchments. A simulation of earthquake cycles suggests efficient transfer of organic carbon out of a mountain range during the first decade of the post-seismic period. Pulsed erosion of organic matter by earthquake-triggered landslides is therefore an effective process to promote carbon sequestration in sedimentary deposits over thousands of years.
DOI	10.5194/esurf-9-823-2021
关键词[WOS]	PARTICULATE ORGANIC-CARBON ; ALPINE FAULT ; TERRESTRIAL BIOSPHERE ; SEDIMENT TRANSPORT ; MARINE-SEDIMENTS ; SOUTH ISLAND ; EROSION ; RIVER ; SOIL ; PRESERVATION
收录类别	SCI ; SCI
语种	英语
资助项目	UK Natural Environment Research Council[NE/P013538/1] ; Rutherford Foundation Postdoctoral Fellowship[RFTGNS1201-PD] ; COFUND Junior Research Fellowship at Durham University
WOS研究方向	Physical Geography ; Geology
项目资助者	UK Natural Environment Research Council ; Rutherford Foundation Postdoctoral Fellowship ; COFUND Junior Research Fellowship at Durham University
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000680812300001
出版者	COPERNICUS GESELLSCHAFT MBH
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16898
专题	加速器质谱中心
通讯作者	Croissant, Thomas
作者单位	1.Univ Durham, Dept Geog, Durham DH1 3LE, England 2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA 3.Victoria Univ Wellington, Sch Geog Environm & Earth Sci, POB 600, Wellington, New Zealand 4.Univ Rennes 1, CNRS, Geosci Rennes, UMR 6118, F-35000 Rennes, France 5.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China 6.Cardiff Univ, Sch Earth & Ocean Sci, Main Bldg,Pk Pl, Cardiff CF10 3AT, Wales
推荐引用方式 GB/T 7714	Croissant, Thomas,Hilton, Robert G.,Li, Gen K.,et al. Pulsed carbon export from mountains by earthquake-triggered landslides explored in a reduced-complexity model[J]. EARTH SURFACE DYNAMICS,2021,9(4):823-844.
APA	Croissant, Thomas.,Hilton, Robert G..,Li, Gen K..,Howarth, Jamie.,Wang, Jin.,...&Densmore, Alexander L..(2021).Pulsed carbon export from mountains by earthquake-triggered landslides explored in a reduced-complexity model.EARTH SURFACE DYNAMICS,9(4),823-844.
MLA	Croissant, Thomas,et al."Pulsed carbon export from mountains by earthquake-triggered landslides explored in a reduced-complexity model".EARTH SURFACE DYNAMICS 9.4(2021):823-844.