DOI: 10.1016/j.palaeo.2015.02.024
论文题名: A model-based evaluation of tropical climate in Pangaea during the late Palaeozoic icehouse
作者: Heavens N.G. ; Mahowald N.M. ; Soreghan G.S. ; Soreghan M.J. ; Shields C.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 425 起始页码: 109
结束页码: 127
语种: 英语
英文关键词: Carboniferous
; Climate
; Glaciation
; Modeling
; Monsoon
; Palaeozoic
; Permian
英文摘要: The late Palaeozoic ice age (LPIA) is the Earth's penultimate "icehouse climate." Geological proxies for tropical Pangaean climate during the LPIA are significantly modulated on 100-400. kyr and sub-100. kyr scales. In addition, some geological proxies suggest that equatorial continental areas may have been colder and more arid during LPIA glacial intervals than during late Cenozoic glacial intervals. Furthermore, the relationship between polar and tropical climate variability remains controversial. The climate dynamics underlying these phenomena are only partly understood. Nevertheless, past modeling of LPIA climate has suggested that precipitation near the Equator was modulated by monsoonal circulation that itself was modulated by orbital variability. Here, the Earth's climate during Asselian-Sakmarian time (299-284. Ma) was simulated with the Community Climate System Model version 3 (CCSM3). These simulations address model climate sensitivity to direct and indirect effects of glaciation as well as variability in the Earth's orbit. The results of these simulations suggest that sea level and orbitally forced monsoon variability were the primary controls on tropical precipitation when ice sheets were confined to polar latitudes. Any impact of orbital forcing on glaciation therefore could have led to aliasing between glacial and monsoonal effects in particular regions, perhaps explaining contrasting geologically-based interpretations of how tropical climate responded to glaciation. Glaciation of the Central Pangaean Mountains would have led to widespread cold and aridity in equatorial Pangaea, but forming these glaciers would have required an unknown additional climate forcing with an unknown impact on tropical precipitation. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68980
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric and Planetary Sciences, Hampton University, 23 E. Tyler St, Hampton, VA, United States; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; School of Geology and Geophysics, University of Oklahoma, Norman, OK, United States; Climate Change Research Section, Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Heavens N.G.,Mahowald N.M.,Soreghan G.S.,et al. A model-based evaluation of tropical climate in Pangaea during the late Palaeozoic icehouse[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,425