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基于湖泊沉积记录的中国西南地区全新世气候变化研究进展
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Abstract:
全新世以来的气候变化特征是当今世界范围内古气候研究的重点和热点。位于亚洲东南部的中国西南地区地貌类型复杂,其气候变化不仅受全球性气候因素驱动,也显著受其他区域性因素的影响,其环境因子更加复杂。在对中国西南地区全新世以来湖泊沉积重建古气候相关研究整合分析的基础上,本文归纳总结了该区百年时间尺度上全新世植被演替和气候变化的主要特征。结果表明,西南地区全新世以来总体呈现湿润的气候特征,即早期(11.5~8 ka BP)气候从干冷向暖湿转变,中期(8~3.5 ka BP)温暖湿润,晚期(3.5 ka BP至今)气候向减湿方向发展;表明该区具有相对独特的区域性气候特征。同时,本文还对全新世西南地区的气候变化的影响机制进行了讨论。
The characteristics of climate change since the Holocene are the focus and hot spot of pale climate research around the globe. The various geomorphologic types of southwest China, which is in southeast Asia, contribute to the complexity of its environmental aspects. The region’s climate change is impacted by both global and regional influences, making it even more complicated. We provide a summary of the key elements of Holocene vegetation succession and climate change in southwest China on a 100-year time scale based on the integration and analysis of lake sedimentary reconstruction and paleoclimate-related studies conducted since the Holocene. The results indicate that southwest China has experienced a humid Holocene; that is, the climate changed from being dry and cold to warm and humid in the early period (11.5~8 ka BP), warm and humid in the middle period (8~3.5 ka BP) and decreasing humidity in the late period (3.5 ka BP to present). It implies that this region has a comparatively unique regional climatic feature. The mechanisms influencing climate change in the southwestern part of the Holocene are also discussed.
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