Asynchronous Holocene climatic change across China
Asynchronous Holocene climatic change across China
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DOI：
10.1016/j.yqres.2003.08.004
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发表时间：
2004-01-01
影响因子：
2.3
通讯作者：
Pang, HX
中科院分区：
文献类型：
--
作者：
He, Y;Theakstone, WH;Pang, HX
中国各地全新世气候变化具有异步性。冰芯、花粉、黄土、湖泊沉积物和海平面变化等代用资料表明，全新世中国发生了多次冷暖振荡，其中包括一次重要的气候事件--"全新世最佳期"，即气候温和湿润期，其持续时间、振幅和起止时间在中国各地存在差异。青藏高原数百万年来的隆升导致了全新世中国大陆季风气候的发展和复杂的大气环流。结果表明，全新世最适期在中国西部高海拔地区比东部低海拔地区开始和结束得早，且东部的变化幅度较低。这表明西部高海拔地区比东部低海拔地区对气候变化更敏感。敦德冰芯和古里雅冰芯的全新世气候记录并不一致。δ~（18）O的反变化表明，气候和大气过程对两地稳定同位素的影响是不同的。中国西部湖泊沉积碳酸盐同位素组成与气候变化的相关性与冰芯相似。冰芯和湖泊沉积物的气候分辨率高于其他介质。基于中国不同地区代用资料建立的气候记录缺乏精确的对应关系，这是由于采样点的位置和海拔不同、源资料的分辨率不同以及中国境内气候条件不同的结果。需要进一步的工作来证实这里提出的结论和推论。(C)2003年华盛顿大学。All rights reserved.
A review of Holocene climatic variations in different parts of China shows that they were asynchronous. Proxy data from ice cores, pollen, loess, lacustrine sediments, and changes of sea and lake levels demonstrate that many warm and cold oscillations have occurred in China during the Holocene, including a most important climatic event known as the "Holocene optimum," a milder and wetter period, and that the duration and amplitude of the optimum period, as well as its start and end times, differed in different parts of China. Uplift of the Tibetan plateau over the past millions of years led to the development of the monsoon climate and to complex atmospheric circulation over continental China during the Holocene. As a result, the Holocene optimum began and terminated earlier in high-altitude regions of western China than at lower elevations in eastern China, and the amplitude of the variations was lower in the east. This suggests that the western higher-altitude areas were more sensitive to climatic change than were the eastern lower-altitude areas. Holocene climatic records in the Dunde and Guliya ice cores do not correspond. Inverse delta(18)O variations between the two cores indicate that the effects of climate and atmospheric processes on the stable isotopes at the two sites differed. The correlation between the isotopic composition of carbonates in lake deposits in western China and climatic variations is similar to that in the ice cores. The climatic resolution in ice cores and lake sediments is higher than that in other media. The lack of precise correspondence of climatic records constructed on the basis of proxy data from different parts of China is a result of the different locations and elevations of the sampling sites, the different resolutions of the source material, and the varied climatic conditions within China. Further work is needed to confirm both the conclusions and the inferences presented here. (C) 2003 University of Washington. All rights reserved.