DOI: 10.1029/2019GC008464
论文题名: Ice, Fire, or Fizzle: The Climate Footprint of Earth's Supercontinental Cycles
作者: Jellinek A.M. ; Lenardic A. ; Pierrehumbert R.T.
刊名: Geochemistry, Geophysics, Geosystems
ISSN: 15252027
出版年: 2020
卷: 21, 期: 2 语种: 英语
英文关键词: long-term climate variability
; mantle convective thermal mixing
; Mesozoic cooling-warming
; Neoproterozoic snowball Earth
; Precambrian global warming
; supercontinental assembly and breakup
Scopus关键词: Carbon
; Digital storage
; Earth (planet)
; Global warming
; Ice
; Mixing
; Oceanography
; Structural geology
; Surface waters
; Weathering
; Long-term climate variability
; Mesozoic
; Precambrian
; Snowball Earth
; Thermal mixing
; Climate models
; climate variation
; continental breakup
; cooling
; Ediacaran
; global warming
; mantle convection
; mid-ocean ridge
; mixing
; paleoclimate
; Precambrian
; supercontinent
英文摘要: Supercontinent assembly and breakup can influence the rate and global extent to which insulated and relatively warm subcontinental mantle is mixed globally, potentially introducing lateral oceanic-continental mantle temperature variations that regulate volcanic and weathering controls on Earth's long-term carbon cycle for a few hundred million years. We propose that the relatively warm and unchanging climate of the Nuna supercontinental epoch (1.8–1.3 Ga) is characteristic of thorough mantle thermal mixing. By contrast, the extreme cooling-warming climate variability of the Neoproterozoic Rodinia episode (1–0.63 Ga) and the more modest but similar climate change during the Mesozoic Pangea cycle (0.3–0.05 Ga) are characteristic features of the effects of subcontinental mantle thermal isolation with differing longevity. A tectonically modulated carbon cycle model coupled to a one-dimensional energy balance climate model predicts the qualitative form of Mesozoic climate evolution expressed in tropical sea-surface temperature and ice sheet proxy data. Applied to the Neoproterozoic, this supercontinental control can drive Earth into, as well as out of, a continuous or intermittently panglacial climate, consistent with aspects of proxy data for the Cryogenian-Ediacaran period. The timing and magnitude of this cooling-warming climate variability depends, however, on the detailed character of mantle thermal mixing, which is incompletely constrained. We show also that the predominant modes of chemical weathering and a tectonically paced abiotic methane production at mid-ocean ridges can modulate the intensity of this climate change. For the Nuna epoch, the model predicts a relatively warm and ice-free climate related to mantle dynamics potentially consistent with the intense anorogenic magmatism of this period. © 2020. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159683
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Department of Earth Science, Rice University, Houston, TX, United States; Department of Atmospheric Physics, Clarendon Laboratory, Oxford University, Oxford, United Kingdom
Recommended Citation:
Jellinek A.M.,Lenardic A.,Pierrehumbert R.T.. Ice, Fire, or Fizzle: The Climate Footprint of Earth's Supercontinental Cycles[J]. Geochemistry, Geophysics, Geosystems,2020-01-01,21(2)