The history and variability of the East Asian paleomonsoon climate
The history and variability of the East Asian paleomonsoon climate
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DOI：
10.1016/s0277-3791(99)00060-8
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发表时间：
2000-01-01
影响因子：
4
通讯作者：
An, ZS
中科院分区：
文献类型：
--
作者：
An, ZS
东亚古季风的变化反映了全球大气、海洋、陆地和冰系统之间的相互作用，也是它们在东亚大陆和太阳辐射的边界条件下共同作用的表现。东亚季风的历史是由干燥寒冷的冬季和温暖潮湿的夏季季风交替主导的。在中国黄土高原保存的高分辨率风成序列表明，东亚季风可能至少在7.2 Ma之前开始。4和7.2 Ma可能在诱发气候变化方面发挥了重要作用。末次冰期的古气候记录表现出1000年或更短时间尺度上的高频变率，以及东亚古季风系统的不稳定性。高频变率可能是由于对轨道强迫的非线性响应，或者是全球系统不同组成部分之间耦合过程的结果。北部高纬度地区的冷空气活动、南半球的跨赤道气流以及ENSO可能在东亚季风变率中发挥了重要作用。沿极-赤道-极（PEP）样带的所有古气候事件的同步性仍然是一个悬而未决的问题。东亚和澳大利亚近30年来有限的古气候记录的相关性表明，由季风和信风驱动的跨赤道气流可能对相对的半球产生了影响。1999爱思唯尔科学有限公司版权所有。
Changes in the East Asian paleomonsoon reflect interactions between the global atmosphere, ocean, land and ice systems, and are also an expression of their combined effect within the boundary conditions imposed by the East Asian continent and solar radiation. The history of the East Asian monsoon is an alternation between dominance by the dry-cold winter and warm-humid summer monsoons. High-resolution eolian sequences preserved in the Chinese Loess Plateau reveal that the East Asian monsoon may have commenced at least 7.2 Ma ago. They also provide evidence indicating that the pulsed uplift of the Tibetan Plateau at about 3.4 and 7.2 Ma may have played an important role in inducing climate change. The palaeoclimatic records of the last glacial cycle show high-frequency variability on time scales of 1000-year or even shorter, and instability of the East Asian paleomonsoon system. The high-frequency variability could be due to a non-linear response to orbital forcing, or a result of the coupling processes between different components of the global system. Cold air activity in northern high latitudes, the trans-equatorial air streams from the Southern Hemisphere and, possibly, ENSO may have played an important role in East Asian monsoon variability. The synchroneity of all the palaeoclimatic events along the polar-equator-polar (PEP) transect is still an open question. Correlation of limited palaeoclimatic records for the last 30 kyr obtained from East Asia and Australia suggests that the trans-equatorial air streams driven by the monsoon and trade winds may have had an influence on opposite hemispheres. (C) 1999 Elsevier Science Ltd. All rights reserved.