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DOI	10.1016/j.gr.2021.05.016
	New paleogeographic and degassing parameters for long-term carbon cycle models
	Marcilly, Chloe M.; Torsvik, Trond H.; Domeier, Mathew; Royer, Dana L.
通讯作者	Marcilly, CM (corresponding author), Univ Oslo, Ctr Earth Evolut & Dynam CEED, N-0315 Oslo, Norway.
来源期刊	GONDWANA RESEARCH
ISSN	1342-937X
EISSN	1878-0571
出版年	2021
卷号	97 页码:176-203
英文摘要	Long-term carbon cycle models are critical for understanding the levels and underlying controls of atmospheric CO2 over geological time-scales. We have refined the implementation of two important boundary conditions in carbon cycle models, namely consumption by silicate weathering and carbon degassing. Through the construction of continental flooding maps for the past 520 million years (Myrs), we have estimated exposed land area relative to the present-day (f(A)), and the fraction of exposed land area undergoing silicate weathering (f(AW-fA)). The latter is based on the amount of exposed land within the tropics (+/- 10 degrees) plus the northern/southern wet belts (+/- 40-50 degrees) relative to today, which are the prime regions for silicate weathering. We also evaluated climate gradients and potential weatherability by examining the distribution of climate-sensitive indicators. This is particularly important during and after Pangea formation, when we reduce f(AW-)f(A) during times when arid equatorial regions were present. We also estimated carbon degassing for the past 410 Myrs using the subduction flux from full-plate models as a proxy. We further used the subduction flux to scale and normalize the arc-related zircon age distribution (arc-activity), allowing us to estimate carbon degassing in much deeper time. The effect of these refined modelling parameters for weathering and degassing was then tested in the GEOCARBSULFvolc model, and the results are compared to other carbon cycle models and CO2 proxies. The use of arc-activity as a proxy for carbon degassing brings Mesozoic model estimates closer to CO2 proxy values but our models are highly sensitive to the definition of f(AW-)f(A). Considering only variations in the land availability to weathering that occur in tropical latitudes (corrected for arid regions) and the use of our new degassing estimates leads to notably higher CO2 levels in the Mesozoic, and a better fit with the CO2 proxies. (C) 2021 The Author(s). Published by Elsevier B.V. on behalf of International Association for Gondwana Research.
英文关键词	Carbon cycle Modelling Paleoclimate Phanerozoic Paleogeography Degassing
类型	Review
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000671547600006
WOS关键词	PALEOZOIC ICE-AGE ; ATMOSPHERIC CO2 ; SURFACE-TEMPERATURE ; RELATIVE IMPORTANCE ; GEOCHEMICAL CYCLE ; REFERENCE FRAME ; CLIMATE-CHANGE ; EARTH ; CONSTRAINTS ; SUBDUCTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350462
作者单位	[Marcilly, Chloe M.; Torsvik, Trond H.; Domeier, Mathew] Univ Oslo, Ctr Earth Evolut & Dynam CEED, N-0315 Oslo, Norway; [Torsvik, Trond H.] Univ Witwatersrand, Sch Geosci, ZA-2050 Johannesburg, South Africa; [Royer, Dana L.] Wesleyan Univ, Dept Earth & Environm Sci, Middletown, CT 06459 USA
推荐引用方式 GB/T 7714	Marcilly, Chloe M.,Torsvik, Trond H.,Domeier, Mathew,et al. New paleogeographic and degassing parameters for long-term carbon cycle models[J],2021,97:176-203.
APA	Marcilly, Chloe M.,Torsvik, Trond H.,Domeier, Mathew,&Royer, Dana L..(2021).New paleogeographic and degassing parameters for long-term carbon cycle models.GONDWANA RESEARCH,97,176-203.
MLA	Marcilly, Chloe M.,et al."New paleogeographic and degassing parameters for long-term carbon cycle models".GONDWANA RESEARCH 97(2021):176-203.