DOI: 10.1002/jgrd.50849
论文题名: Feedbacks in a coupled ice-atmosphere-dust model of the glacial Neoproterozoic "mudball Earth"
作者: Goodman J.C. ; Strom D.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11546
结束页码: 11557
语种: 英语
英文关键词: chaos
; deglaciation
; dust
; Neoproterozoic
; snowball Earth
; supraglacial
Scopus关键词: Carbon dioxide
; Chaos theory
; Climate models
; Dust
; Earth atmosphere
; Feedback
; Geochronology
; Greenhouse gases
; Solar radiation
; Chaotic oscillation
; Climate feedbacks
; Deglaciations
; Model resolution
; Neoproterozoic
; Orders of magnitude
; Snowball Earth
; supraglacial
; Ice
; albedo
; chaotic dynamics
; climate conditions
; climate feedback
; climate modeling
; deglaciation
; dust
; energy balance
; greenhouse gas
; ice
; meltwater
; paleoclimate
; Proterozoic
; warming
英文摘要: The climate state of an ice-covered Neoproterozoic "Snowball Earth" climate is highly sensitive to the presence of dust on the ice. Other authors have noted that the accumulation of dust can lower the albedo of an ice-covered world enough to allow deglaciation even with fairly modest amounts of greenhouse gas warming. Here, we model the accumulation, transport, and removal of dust in a coupled ice-atmosphere-dust climate model, operating within the simplified framework of a one-dimensional energy balance climate model. We confirm that the buildup of low-albedo dust makes our model easier to deglaciate (requiring orders of magnitude less carbon dioxide than a no-dust model) and discover novel climate feedbacks and chaos in the dusty ice system. As dust accumulates, its low albedo warms the ice and can cause it to melt: in our model, the meltwater carries away dust, leading to both a simple negative feedback (the "dust thermostat") and chaotic oscillations. The feedback is robust over a broad range of model parameters, but the chaotic oscillations are sensitive to model resolution. Key Points Adding dust to a Snowball Earth climate model lets it deglaciate more easily A negative feedback in which meltwater removes dust from the ice is discovered The dusty Snowball ice sheet exhibits chaotic flow surges across the equator ©2013. 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/63219
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Physics and Astronomy, Wheaton College, 26 E. Main Street, Norton MA 02766, United States; National Weather Service, Meteorological Development Lab, Silver Spring MD, United States
Recommended Citation:
Goodman J.C.,Strom D.C.. Feedbacks in a coupled ice-atmosphere-dust model of the glacial Neoproterozoic "mudball Earth"[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)