Did Earth drive itself to a snowball?  

作　　者：Chunan Tang 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences [2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan)

出　　处：《Science Bulletin》2018年第16期1032-1033,共2页科学通报（英文版）

基　　金：supported by the project from the State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences) (183120)

摘　　要：The icehouse model,in terms of low CO_2 effect,elegantly accounted for the global cooling events on Earth’s surface,which has occurred at least several times in the history of Earth evolution.However,it does not appear to explain the great cooling events such as the Late Ordovician glaciation with an unusually high CO_2 level of 4,000 ppmv[1],more than ten times higher thanThe icehouse model, in terms of low CO2 effect, elegantly accounted for the global cooling events on Earth＇s surface, which has occurred at least several times in the history of Earth evolution. However, it does not appear to explain the great cooling events such as the Late Ordovician glaciation with an unusually high CO2 level of 4,000 ppmv [1], more than ten times higher than the CO2 level of today. Previous published records shows a CO2 increase during some glaciations [2], conflicting with the mainstream theory. Although Pagani et al. [3] later suggested that the evidences available support a drop in C02 as a critical condition for global cooling, whether CO2 played a dominant role alone to cause the greenhouse-icehouse transition or whether a threshold level of CO2 ultimately induced global cooling cannot be determined from their results.

关 键 词：冷却事件 驾驶 CO2 水平解 奥陶纪 C02 地球 冰库 

分 类 号：P343.6[天文地球—水文科学]