Climatic variations over the last 4000 cal yr BP in the western margin of the Tarim Basin, Xinjiang, reconstructed from pollen data
Climatic variations over the last 4000 cal yr BP in the western margin of the Tarim Basin, Xinjiang, reconstructed from pollen data
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DOI：
10.1016/j.palaeo.2012.01.012
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Keliang Zhao;Xiaoqiang Li;J. Dodson;P. Atahan;Xinying Zhou;F. Bertuch
中科院分区：
文献类型：
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作者：
Keliang Zhao;Xiaoqiang Li;J. Dodson;P. Atahan;Xinying Zhou;F. Bertuch
亚洲中部全新世气候模式和机制的性质是开放的研究领域。在这项研究中，区域植被和气候动态在过去的ca。本文利用塔里木盆地西缘喀什绿洲的高分辨率花粉记录，重建了该地区4000年的古气候。麻黄，藜科和大麻科占主导地位的花粉组合，藜科/麻黄的比例和远距离运输花粉类群的百分比被用来推断水分和植被密度的区域变化。三个时期的湿度增加确定，从约。4000-2620 calyr BP，ca. 1750-1260 calyr BP和ca. 550-390 calyr BP和这些时期分别与全新世债券事件2，1和0，这是在北大西洋报告。中纬度西风带强度的任何增加或向南迁移都会导致研究地点周围山脉的降水和融水增加。在大约1260和840 calyr BP（AD 690-1110）之间检测到温暖和干燥的条件，在大约1260和840 calyr BP（AD 690-1110）之间检测到凉爽和潮湿的条件。840和680 calyr BP（AD 1110-1270），在中世纪温暖时期（约。公元800-1200年）。喀什地区近4000年来的气候变化主要受西风环流系统和周围山脉冰川动力学的影响。然而，亚洲季风是否为塔里木盆地西部地区提供降水的问题仍然是一个有争议的问题，该地区受几个气候系统的影响。
The nature of Holocene climate patterns and mechanisms in central Asia are open areas of inquiry. In this study, regional vegetation and climate dynamics over the last ca. 4000years are reconstructed using a high resolution pollen record from the Kashgar oasis, on the western margin of the Tarim Basin, central Asia. Ephedra, Chenopodiaceae and Cannabaceae dominate the pollen assemblages, and Chenopodiaceae/Ephedra ratios and percentages of long-distance transported pollen taxa are used to infer regional variations in moisture and vegetation density. Three periods of increased humidity are identified, from ca. 4000–2620calyr BP, ca. 1750–1260calyr BP and ca. 550–390calyr BP and these periods coincide with the respective Holocene Bond Events 2, 1 and 0, which are reported in the North Atlantic. Any increase in strength, or southward migration, of the mid-latitude westerlies would result in more precipitation and meltwater on mountains surrounding the study site. Warm and dry conditions are detected between ca.1260 and 840calyr BP (AD 690–1110), and cool and wet conditions are detected between ca. 840 and 680calyr BP (AD 1110–1270), during the Medieval Warm Period (ca. AD 800–1200). The climate variations in the Kashgar region over the last 4000years appear to have been dominated by changes to the westerly circulation system and glacier dynamics on surrounding mountains. However, the question of whether the Asian monsoon delivers precipitation to the western Tarim Basin, a region that is influenced by several climate systems, is still open to debate.