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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Evidence for climate instability during the Younger Dryas interval in the Hengduan Mountains, Yunnan, southwestern China
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Evidence for climate instability during the Younger Dryas interval in the Hengduan Mountains, Yunnan, southwestern China

机译：云南省云南省云南，云南，云南，云南省云南，中国西南部

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The Younger Dryas (YD) is the most recent abrupt climatic event recognized during the transition from the last glaciation to the Holocene. Growing evidence from the middle and high latitudes of Europe and North America shows that the climate within the YD event was highly unstable. Until recently, however, climate instability during this event has received little attention elsewhere in the world. Here we present evidence of a climatically unstable YD based on pollen-climate transfer function and REDFIT spectral analysis of pollen data from Haligu in the Hengduan Mountains of southwestern China, a low latitude temperate biodiversity hotspot. Our data show that the climate fluctuated significantly during the YD, with three warm peaks recognized at 11.5, 11.7 and 12.3 cal kyr BP. In particular, we estimate a gradual rise in mean annual temperature by 3.7 degrees C between the end of the YD and the early Holocene (11.2-10.9 cal kyr BP). In response to this, the subalpine conifer forest dominated by Picea and Abies may have migrated about 610 m upwards. We also detected that the climate fluctuations during the YD-Holocene transition show significant centennial periodicities of 76 yr, 84 yr, 91 yr, 95 yr, and 638 yr. The former four cycles are possibly related to the Gleissberg (around 80 yr) solar cycle, which was also detected in the Hongyuan peat, the PC-6 core of the East China Sea and the GISP2 ice core. These new findings enhance our understanding of millennial-scale abrupt climate events which may be of great significance in predicting the impact of future climate change on mountainous ecosystems in southwestern China. The warming at the end of the YD may provide a potential analog for global warming in the near future, during which the upward migration of vegetation zones will likely lead to the loss of habitat for threatened species. We therefore should take action to restore habitats and provide protected areas for species at risk.
机译：年轻的Dryas（YD）是在从最后冰川到全新世的过渡期间认识到最新的突然气候事件。欧洲和北美中部和高纬度的日益增长的证据表明，捷径活动中的气候非常不稳定。然而，直到最近，这次活动期间的气候不稳定已经收到了世界其他地方的重视。在这里，我们提出了一种基于花粉气候转移功能和来自中国西南部横升山脉的花粉数据的花粉数据的Redfit谱分析，这是一个低纬度温带生物多样性热点。我们的数据显示，在YD期间，气候波动显着波动，在11.5,11.7和12.3克尔Kyr BP中识别出三个温暖的峰。特别是，在YD结束和全新世（11.2-10.9 Cal Kyr By）之间，我们估计平均年度温度逐渐上升3.7摄氏度。响应于此，由Picea和Andies主导的亚水平针叶树林可能已经向上迁移了大约610米。我们还检测到yd-全新世过渡期间的气候波动显示出76毫升，84岁，91岁，95岁和638年的百年百年周期。前四个周期可能与Gleissberg（约80年）太阳循环有关，也在宏远泥炭中检测到东海的PC-6核心和GISP2冰芯。这些新发现提高了我们对千年级突然气候事件的理解，这可能具有重要意义，在预测中国西南部的山区生态系统对未来气候变化的影响方面可能具有重要意义。在近期的近期末端的变暖可以在不久的将来提供全球变暖的潜在类似物，在此期间，植被区的向上迁移可能会导致危及物种的栖息地损失。因此，我们应该采取行动恢复栖息地，并为风险提供保护区。

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