Arid
DOI10.1029/2011JD015927
The Jormungand global climate state and implications for Neoproterozoic glaciations
Abbot, Dorian S.1; Voigt, Aiko2; Koll, Daniel1
通讯作者Abbot, Dorian S.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
出版年2011
卷号116
英文摘要

Geological and geochemical evidence can be interpreted as indicating strong hysteresis in global climate during the Neoproterozoic glacial events (similar to 630 Ma and similar to 715 Ma). Standard climate theory only allows such strong hysteresis if global climate enters a fully-glaciated "Snowball" state. However, the survival of photosynthetic, eukaryotic, marine species through these glaciations may indicate that there were large areas of open ocean. A previously-proposed "Slushball" model for Neoproterozoic glaciations could easily explain the survival of these organisms because it has open ocean throughout the tropics, but there is only a small amount of hysteresis associated with the Slushball state. In this paper a new state of global climate, the "Jormungand" state, is proposed. In this state the ocean is very nearly globally ice-covered, but a very small strip of the tropical ocean remains ice-free. The low ice latitude of the Jormungand state is a consequence of the low albedo of snow-free (bare) sea ice. If the ice latitude propagates into the subtropical desert zone, it can stabilize without collapsing to the equator because subtropical ice-covered regions have a relatively low top-of-atmosphere albedo as a result of the exposure of bare sea ice and relatively lower cloud cover. Moreover, there is strong hysteresis associated with the Jormungand state as greenhouse gas levels are varied because of the high albedo contrast between regions of bare and snow covered sea ice. The Jormungand state is illustrated here in two different atmospheric global climate models and in the Budyko-Sellers model. By offering a scenario that could explain both strong hysteresis in global climate and the survival of life, the Jormungand state represents a potential model for Neoproterozoic glaciations, although further study of this issue is needed.


类型Article
语种英语
国家USA ; Germany
收录类别SCI-E
WOS记录号WOS:000295131700006
WOS关键词HARD SNOWBALL EARTH ; GENERAL-CIRCULATION MODELS ; FLOWING SEA GLACIERS ; ICE CAP INSTABILITY ; ANTARCTIC PENINSULA ; HEAT-TRANSPORT ; CO2 LEVELS ; DEGLACIATION ; FEEDBACK ; OCEAN
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/169181
作者单位1.Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA;
2.Max Planck Inst Meteorol, D-20146 Hamburg, Germany
推荐引用方式
GB/T 7714
Abbot, Dorian S.,Voigt, Aiko,Koll, Daniel. The Jormungand global climate state and implications for Neoproterozoic glaciations[J],2011,116.
APA Abbot, Dorian S.,Voigt, Aiko,&Koll, Daniel.(2011).The Jormungand global climate state and implications for Neoproterozoic glaciations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,116.
MLA Abbot, Dorian S.,et al."The Jormungand global climate state and implications for Neoproterozoic glaciations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 116(2011).
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