Three centuries of winter temperature change on the southeastern Tibetan Plateau and its relationship with the Atlantic Multidecadal Oscillation
Three centuries of winter temperature change on the southeastern Tibetan Plateau and its relationship with the Atlantic Multidecadal Oscillation
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DOI：
10.1007/s00382-016-3381-3
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发表时间：
2017-08
期刊：
影响因子：
4.6
通讯作者：
Shiyuan Shi;Jinbao Li;Jiangfeng Shi;Yesi Zhao;G. Huang
中科院分区：
文献类型：
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作者：
Shiyuan Shi;Jinbao Li;Jiangfeng Shi;Yesi Zhao;G. Huang
青藏高原东南部地区缺乏包含冷季温度信号的长期、高分辨率代用资料，限制了我们对区域气候及其潜在驱动力的理解。在这项研究中，我们提出了一个近三个世纪的重建冬季（12月至2月）平均气温横断山脉中部，东南TP。根据云南松（PinusyunnanensisFranch）两个高海拔地点（海拔>3000 m）的复合树轮宽度年表，重建了云南松（PinusyunnanensisFranch）的年轮宽度。我们的重建通过了所有标准的校准验证方案，并解释了近73%的原始仪器数据的方差。然而，由于1992年后树轮指数的温度敏感性降低，我们只能在1959年至1992年的校准期内校准12月至2月平均温度的全周期（1718-2013年）重建。空间相关分析表明，我们重建的大尺度温度变化在中国西南地区和东部TP。我们重建的12月至2月平均温度显示出密切的关联与大西洋多年代际振荡（AMO）在过去的三个世纪，与温暖（冷）的AMO的正（负）阶段相一致。这种持续的关系表明，AMO可能是东南TP几十年冬季温度变化的关键驱动因素。
Long-term, high-resolution proxy records containing cold season temperature signals are scarce on the southeastern Tibetan Plateau (TP), limiting our understanding of regional climate and the potential driving forces. In this study, we present a nearly three centuries long reconstruction of winter (December–February) mean temperature for the central Hengduan Mountains, southeastern TP. The reconstruction is derived from a composite tree-ring width chronology ofPinus yunnanensisFranch from two high elevation sites (>3000 m above sea level). Our reconstruction passes all standard calibration-verification schemes and explains nearly 73 % of the variance of the original instrumental data. However, we were constrained to calibrate our full period (1718–2013) reconstruction of December–February mean temperature on the calibration period from 1959 to 1992 only, due to a decrease in temperature sensitivity of tree-ring index exhibited after 1992. Spatial correlation analysis shows that our reconstruction represents large-scale temperature variations in southwest China and the eastern TP. Our reconstructed December–February mean temperature shows a close association with the Atlantic Multidecadal Oscillation (AMO) over the past three centuries, with warm (cold) periods coinciding with the positive (negative) phases of the AMO. This persistent relationship suggests that the AMO may have been a key driver of multidecadal winter temperature variations on the southeastern TP.