DOI: 10.1175/JCLI-D-17-0821.1
Scopus记录号: 2-s2.0-85054084674
论文题名: Influence of surface topography on the critical carbon dioxide level required for the formation of a modern snowball Earth
作者: Liu Y. ; Richard Peltier W. ; Yang J. ; Hu Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8463
结束页码: 8479
语种: 英语
英文关键词: Climate change
; Ice age
; Model comparison
; Orographic effects
; Paleoclimate
; Topographic effects
Scopus关键词: Carbon dioxide
; Climate change
; Earth atmosphere
; Feedback
; Glacial geology
; Global warming
; Sea ice
; Snow
; Solar radiation
; Surface topography
; Topography
; Ice age
; Model comparison
; Orographic effects
; Paleoclimates
; Topographic effects
; Climate models
英文摘要: The influence of continental topography on the initiation of a global glaciation (i.e., snowball Earth) is studied with both a fully coupled atmosphere-ocean general circulation model (AOGCM), CCSM3, and an atmospheric general circulation model (AGCM), CAM3 coupled to a slab ocean model. It is found that when the climate is very cold, snow cover over the central region of the Eurasian continent decreases when the atmospheric CO2 concentration (pCO2) is reduced. In the coupled model, this constitutes a negative feedback due to the reduction of land surface albedo that counteracts the positive feedback due to sea ice expansion toward the equator. When the solar insolation is 94% of the present-day value, Earth enters a snowball state when pCO2 is ~35 ppmv. On the other hand, if the continents are assumed to be flat topographically (with the global mean elevation as in the more realistic present-day case), Earth enters a snowball state more easily at pCO2 = ~60 ppmv. Therefore, the presence of topography may increase the stability of Earth against descent into a snowball state. On the contrary, a snowball Earth is found to form much more easily when complex topography is present than when it is not in CAM3. This happens despite the fact that the mid- to high-latitude climate is much warmer (by ~10°C) when topography is present than when it is not. Analyses show that neglecting sea ice dynamics in this model prevents the warming anomaly in the mid- to high latitudes from being efficiently transmitted into the tropics. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110640
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China; Department of Physics, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Liu Y.,Richard Peltier W.,Yang J.,et al. Influence of surface topography on the critical carbon dioxide level required for the formation of a modern snowball Earth[J]. Journal of Climate,2018-01-01,31(20)