Knowledge Resource Center for Ecological Environment in Arid Area
| 亚洲地形和海陆分布变化对东亚环境格局形成演化的作用：数值模拟与地质记录对比 | |
| 其他题名 | Impact of Asian Topography and Sea-land Distribution on the Evolution of East Asian Environmental Patterns: Comparisons between Numerical Simulations and Geological Records |
| 张仲石 | |
| 出版年 | 2005 |
| 学位类型 | 博士 |
| 导师 | 郭正堂 |
| 学位授予单位 | 中国科学院地质与地球物理研究所 |
| 中文摘要 | 已有的研究表明，古近纪时我国的环境格局大致呈纬向带状分布，一条带状干旱带贯穿东西，当时的环境格局属\ |
| 英文摘要 | Earlier studies on the distribution of geological environmental indicators in China revealed drastic changes from a zonal climate pattern (planetary-wave-dominant pattern) in the Paleogene to a monsoon-dominant one in the Neogene, which suggested an inception of the initial East-Asian summer monsoon. However, there are different views about the time and causes of the changes.Here, we attempt to compile a series of paleoenvironmental maps based on newly collected climate indicators from the literatures and chronologically constrained evidence of geological maps in order to re-examine the temporal and spatial evolution of climate belts in China during the Cenozoic with special emphasis on the changes of the arid belt. These indicators include mammalian fauna, coal, carbonate concretions, jarosite, salt, gypsum deposits and pollen assemblages etc, with chronological controls that we believe reliable. Pollen assemblages and mammalian fauna have been classified into three categories (arid, semi-arid/sub-humid, humid) to reflect the intensity of aridity/humidity. Salt, jarosite and gypsum deposits are classified as the arid indicators. Carbonate concretions and coal are classified into the semi-arid/sub-humid and humid one respectively. Paleoenvironmental maps at 8 time slices have been reconstructed. They are the Paleocene, Eocene, Oligocene, Miocene, Early Miocene, Middle Miocene, Late Miocene and Pliocene.And furthermore, we attempt to use IAP^AGCM to simulate the evolution of climate belts in emphasizing on the changes of the rain band, and compare the results with the paleoenvironmental maps in order to examine the causes of the drastic paleoenvironmental changes near the Oligocene/Miocene boundary. 36 sensitive numerical experiments are carried out using the IAP__AGCM to analyze the impacts of the uplift of the Himalayan-Tibetan complex, shrinkage of the Paratethys Sea, expansion of the South China Sea and the development of the polar ice sheets on rain band in China.The main conclusions are as follows:The obtained results essentially confirm the earlier conclusions about a zonal climate pattern in the Paleogene and a different pattern in the Neogene, and illustrate that a monsoon-dominant environmental pattern with inland aridity formed by the Early Miocene, which is temporally consist with the onset of eolian deposits in China.Cenozoic cooling and the formation of polar ice sheets are unlikely the main causes to the changes of environmental patterns mentioned above in China. But northern hemispheric cooling and the ice-sheets can intensify the Siberian High Pressure, and strengthen the winter monsoon circulations and enhance the aridity in the west part of China. These results support the earlier studies.Shrinkage of the Paratethys Sea and uplift of the Himalayan-Tibetan complex played important roles in strengthening the East Asian monsoon and induceing the above changes of environmental pattern, which is consistent with the earlier studies. Furthermore, \ |
| 中文关键词 | 环境格局 ; 行星风系主控型 ; 季风主控型 ; 青藏高原 ; 副特提斯海南海扩张 |
| 英文关键词 | Environmental pattern Planetary-wave-dominant pattern Monsoon-dominant pattern Shrinkage of the Paratethys Sea Uplift of the Himalayan-Tibetan complex Expansion of the South China Sea |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源机构 | 中国科学院地质与地球物理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286407 |
| 推荐引用方式 GB/T 7714 | 张仲石. 亚洲地形和海陆分布变化对东亚环境格局形成演化的作用：数值模拟与地质记录对比[D]. 中国科学院地质与地球物理研究所,2005. |
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