Temperature signals complicate tree-ring precipitation reconstructions on the northeastern Tibetan Plateau
Temperature signals complicate tree-ring precipitation reconstructions on the northeastern Tibetan Plateau
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温度信号使青藏高原东北部树轮降水重建变得复杂
DOI：
10.1016/j.gloplacha.2021.103460
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发表时间：
2021-05
影响因子：
3.9
通讯作者：
Dingcai Yin
中科院分区：
文献类型：
--
作者：
Wenhuo Liu;Xiaohua Gou;Jinbao Li;Yuxia Huo;Meixue Yang;Junzhou Zhang;Weiguo Zhang;Dingcai Yin
树轮宽度年表是重建青藏高原东北部过去降水变率的重要资料。然而，温度信号通常在这些年表中编码，这使降水重建变得复杂，应该仔细评估。这里是祁连杜松(Juniperus przewalskiKom.)在NTP上采集了16个站点的树轮宽度序列，研究了不同温度信号对降水重建的影响。相关分析表明，各年轮系列记录的降水信息相似，但与温度的相关性分别为正相关(p≤=0.0 5，组1)、弱相关(p>；n=0.0 5，组2)和负相关(p≤=0.0 5，组3)。有鉴于此，将所有树木年轮系列划分为三组，以建立年表来重建局地降水。在1957-2011年CE定标期间，第1组重建的上升趋势最快，与观测降水量基本重叠；第2组重建的上升趋势较慢，而第3组重建缺乏上升趋势。因此，用重建的方法来评估近千年来的降水状况，我们得到了不同的结果。第1组(第2组)重建表明，最近20(10)年是过去1000年降水量最多的时期，而第3组重建没有捕捉到这一现象。因此，我们警告说，在使用树轮宽度年表来研究过去的降水变异性之前，应该仔细评估温度的影响。
Tree-ring width chronologies are a critically important material to reconstruct past precipitation variability on the northeastern Tibetan Plateau (NTP). However, temperature signals are often encoded in these chronologies, which complicate the precipitation reconstructions and should be carefully assessed. Here, a dataset of 487 Qilian juniper (Juniperus przewalskiiKom.) tree-ring width series from 16 sites on the NTP were collected to investigate the influence of different temperature signals on the precipitation reconstructions. Correlation analysis showed that all tree-ring series recorded similar precipitation information, but had positive (p≤ 0.05, Group1), weak (p> 0.05, Group2), and negative (p≤ 0.05, Group3) correlations with temperature, respectively. In view of this, all tree-ring series were divided into three groups to develop chronologies to reconstruct local precipitation. During the calibration period of 1957–2011 CE, the Group1 reconstruction had the fastest uptrend, which almost overlapped the observed precipitation; the Group2 reconstruction showed a slower uptrend, whereas the Group3 reconstruction lacked an uptrend. As a result, we get different results when the reconstructions were used to assess the current precipitation status over the past millennium. The Group1 (Group2) reconstructions showed that the recent 20 (10) years were the highest precipitation period over the past millennium, whereas the Group3 reconstruction did not capture this phenomenon. Therefore, we caution that the temperature effects should be evaluated carefully before tree-ring width chronologies being employed to study past precipitation variability.
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DOI：
10.1002/joc.6280
发表时间：
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期刊：
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