DOI: 10.1016/j.palaeo.2015.09.008
论文题名: Transition into a Hothouse World at the Permian-Triassic boundary-A model study
作者: Winguth A.M.E. ; Shields C.A. ; Winguth C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 316
结束页码: 327
语种: 英语
英文关键词: Anoxia
; Climate modeling
; Clouds feedbacks
; Global climate change
; Mass extinction
; Permian-Triassic boundary
; Primary productivity
英文摘要: The Permian-Triassic boundary (PTB, ~252.3Ma) marks the largest mass extinction of the Phanerozoic, with a loss of more than 90% of marine organisms, and is characterized by lethally hot surface temperatures. The PTB global warming has been linked to greenhouse gas emissions from the Siberian Traps and associated coal-bed intrusions and likely led to severe environmental consequences, such as ocean acidification, a decline in the marine productivity, and extensive hypoxia. In order to understand these changes, feedbacks in the climate system have been explored with sensitivity climate simulations and compared to temperature proxies from the sedimentary record. The response of the PTB ocean circulation to an atmospheric perturbation of ~5000PgC, comparable to Earth's total fossil fuel inventory, leads to a global temperature increase by 3-4°C and an increase in ocean stratification. The pole-to-equator temperature gradient decreases by 2°C with an increase in CO2-radiative forcing, predominately due to snow albedo feedbacks over Gondwana. The greenhouse-induced warming would have led to a weakening of the Hadley cell and an associated decrease in the trade winds and equatorial primary productivity. These climatic changes might have been amplified by cloud-feedback processes. A reduced concentration of cloud condensation nuclei due to a biologic decline of dimethylsulfide caused by the temperature stress or changes in airborne mineral particles could have reduced the cloud albedo, particularly in high latitudes. Results from a climate simulation with reduced cloud albedo suggest a polar warming of up to 7°C and a reduction of the pole-to-equator temperature gradient by ~4°C in addition to the reduction caused by the increase in greenhouse-induced radiative forcing. The scenario with reduced cloud albedo further leads to an increase in ocean stratification and widespread low-oxygen concentrations in the Panthalassa during the Early Triassic. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68712
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Environmental Sciences, University of Texas at ArlingtonTX, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Winguth A.M.E.,Shields C.A.,Winguth C.. Transition into a Hothouse World at the Permian-Triassic boundary-A model study[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440