DOI: 10.5194/cp-11-635-2015
Scopus记录号: 2-s2.0-84926473424
论文题名: A new approach for modeling Cenozoic oceanic lithium isotope paleo-variations: The key role of climate
作者: Vigier N. ; Goddéris Y.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 4 起始页码: 635
结束页码: 645
语种: 英语
Scopus关键词: carbon cycle
; Cenozoic
; flux measurement
; foraminifera
; isotopic composition
; lithium
; marine record
; paleoclimate
; uncertainty analysis
; weathering
; Foraminifera
英文摘要: The marine record of ocean lithium isotope composition may provide important information constraining the factors that control continental weathering and how they have varied in the past. However, the equations establishing links between the continental flux of Li to the ocean, the continental Li isotope composition and the ocean Li isotope composition are under-constrained, and their resolution are related to significant uncertainties. In order to partially reduce this uncertainty, we propose a new approach that couples the C and Li cycles, such that our proposed reconstruction of the Cenozoic Li cycle is compatible with the required stability of the exospheric carbon cycle on geological timescales. The results of this exercise show, contrary to expectations, that the Cenozoic evolution of the Li isotope composition of rivers did not necessarily mimic the oceanic δ7Li rise. In contrast, variations in the continental flux of Li to the ocean are demonstrated to play a major role in setting the ocean δ7Li. We also provide evidence that Li storage in secondary phases is an important element of the global Li cycle that cannot be neglected, in particular during the early Cenozoic. Our modeling of the published foraminifera record highlights a close link between soil formation rate and indexes recording the climate evolution during the Cenozoic, such as foraminifera δ18O and pCO2 reconstructions. This leads us to conclude that the Li isotope record does not provide persuasive, unique evidence for erosional forcing of Cenozoic change because it could alternatively be consistent with a climatic control on soil production rates. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49152
Appears in Collections: 气候变化与战略
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Recommended Citation:
Vigier N.,Goddéris Y.. A new approach for modeling Cenozoic oceanic lithium isotope paleo-variations: The key role of climate[J]. Climate of the Past,2015-01-01,11(4)