Distinctive white laminations appear in the black sediments of the Great Ghost Lake in Taiwan.Compared with the black sediments, these white laminations have lower porosity, organic matter content and C/N ra-tio, but ...Distinctive white laminations appear in the black sediments of the Great Ghost Lake in Taiwan.Compared with the black sediments, these white laminations have lower porosity, organic matter content and C/N ra-tio, but higher C/S and N/S ratios, and with organic matter characterized by the phytoplanktons. It suggests thatthey may be deposited in cooler and drier periods. The organic matter of the black sediments was mainiy from landplants, suggesting deposition under warmer and wetter climates. Major white laminations appear in 0 AD, 500 AD,70D AD, 900 AD, 1 350 AD, 1 500 AD, etc., and cortespond to the periods of cold/dry and frequent dust stormsfrom the historical and natural records of China or Peru. These seem to reflect large-scale climatic changes.展开更多
THERE have been seven Great Ice Age (GIA) events during the Earth’s evolutionary history of4.6 Ga. Li Siguang put forward an explanation about the causes of their formation andref. [3] summarized various theories con...THERE have been seven Great Ice Age (GIA) events during the Earth’s evolutionary history of4.6 Ga. Li Siguang put forward an explanation about the causes of their formation andref. [3] summarized various theories concerned. A commonly accepted point is that the even-tual formation of GIA is due to lesser solar radiation absorbed by the Earth. But no one can ex-plain the fact that no GIA had ever appeared from 2.2 to 1.0 Ga B. P. A new viewpoint展开更多
Investigating all the Great Ice Age events throughout the Earth’s history, each was found to follow a strong mountain-making process. Therefore, a hypothesis was put forward with its causality chain as: strong mounta...Investigating all the Great Ice Age events throughout the Earth’s history, each was found to follow a strong mountain-making process. Therefore, a hypothesis was put forward with its causality chain as: strong mountain-making process→great disparity in topography on the Earth surface→introducing efficient atmospheric circulation system (plateau monsoon)→increase in global atmospheric heat engine efficiency →generating more atmospheric kinetic energy → enhancing the planetary westerly (under the condition that the huge relief is longitudinal on the whole )→widening the temperature difference between the equator and the polar regions (restrained by the thermal wind law)→sharp cooling in high latitudes and the polars (supposing the solar radiation was approximately constant)→forming a Great Ice Age event.展开更多
文摘Distinctive white laminations appear in the black sediments of the Great Ghost Lake in Taiwan.Compared with the black sediments, these white laminations have lower porosity, organic matter content and C/N ra-tio, but higher C/S and N/S ratios, and with organic matter characterized by the phytoplanktons. It suggests thatthey may be deposited in cooler and drier periods. The organic matter of the black sediments was mainiy from landplants, suggesting deposition under warmer and wetter climates. Major white laminations appear in 0 AD, 500 AD,70D AD, 900 AD, 1 350 AD, 1 500 AD, etc., and cortespond to the periods of cold/dry and frequent dust stormsfrom the historical and natural records of China or Peru. These seem to reflect large-scale climatic changes.
文摘THERE have been seven Great Ice Age (GIA) events during the Earth’s evolutionary history of4.6 Ga. Li Siguang put forward an explanation about the causes of their formation andref. [3] summarized various theories concerned. A commonly accepted point is that the even-tual formation of GIA is due to lesser solar radiation absorbed by the Earth. But no one can ex-plain the fact that no GIA had ever appeared from 2.2 to 1.0 Ga B. P. A new viewpoint
文摘Investigating all the Great Ice Age events throughout the Earth’s history, each was found to follow a strong mountain-making process. Therefore, a hypothesis was put forward with its causality chain as: strong mountain-making process→great disparity in topography on the Earth surface→introducing efficient atmospheric circulation system (plateau monsoon)→increase in global atmospheric heat engine efficiency →generating more atmospheric kinetic energy → enhancing the planetary westerly (under the condition that the huge relief is longitudinal on the whole )→widening the temperature difference between the equator and the polar regions (restrained by the thermal wind law)→sharp cooling in high latitudes and the polars (supposing the solar radiation was approximately constant)→forming a Great Ice Age event.
