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首页> 外文期刊>Chinese science bulletin >Millennial temperature reconstruction based on tree-ring widths of Qilian juniper from Wulan, Qinghai Province, China
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Millennial temperature reconstruction based on tree-ring widths of Qilian juniper from Wulan, Qinghai Province, China

机译：基于青海省乌兰县祁连杜松树轮宽度的千年温度重建

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摘要

The climate of the past 1000 years is an important context for evaluating the recent climate warming. However, there are few 1000-year-long climate reconstructions with annual resolution in the Qinghai-Tibet Plateau. In this paper, a dendroclimatic analysis was conducted for the radial growth of Qilian juniper from the upper forest limit in Wulan, Qinghai Province. The results of correlation analysis between the tree-ring widths and the climate variables indicate that the growth of junipers at the upper forest limit is mainly limited by low temperatures of September, November and February of the pregrowth season, and July of the current growth season. There is no significant correlation between the tree-ring widths and precipitation. A mean temperature from the previous year's September to the current year's April was reconstructed for the Wulan area since A.D. 1000. The reconstruction can explain 40.8% of the instrumental variance in the calibration period (1856-2002). The reconstruction shows that the 20th century is the warmest 100 years, and the 1990s is the warmest decade during the past 1000 years, while the coldest 100 years and decade occur at 1600-1699 and 1642-1651, respectively. The variations are verified well by the temperature reconstruction of the middle Qilian Mountain (QL) and the total organic carbon (TOC) in the Qinghai Lake sediments. The comparison of our reconstruction with the annual temperature reconstruction of extra-tropical Northern Hemisphere suggests that the climate of Wulan during the Medieval Warm Period is of obvious regional specialty, but there was a good response to the climate of hemispheric scales during the recent 400 years.
机译：过去1000年的气候是评估近期气候变暖的重要背景。然而，在青藏高原，几乎没有一千年的具有年分辨率的气候重建。本文对青海省乌兰县祁连杜松从森林上限的径向生长进行了树状气候分析。树木年轮宽度与气候变量之间的相关分析结果表明，森林上限处的杜松生长主要受到生长前季节的9月，11月和2月以及当前生长季节的7月的低温限制。 。年轮宽度与降水量之间没有显着相关性。自公元1000年以来，乌兰地区重建了从去年9月到本年4月的平均温度，该数据可以解释校准期间（1856-2002）的仪器变化的40.8％。重建显示，20世纪是最温暖的100年，而1990年代是过去1000年中最温暖的十年，而最寒冷的100年和十年分别发生在1600-1699年和1642-1651年。通过对祁连山中部（QL）的温度重建和青海湖沉积物中的总有机碳（TOC）进行了很好的验证。我们的重建与温带北半球年度温度重建的比较表明，中世纪温暖时期的乌兰气候具有明显的区域性，但近400年来对半球尺度的气候有很好的响应。

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