姚付龙,朱诚,夏倩倩,张静,杨海军

• 1:伊犁师范大学生物与地理科学学院
• 2:伊犁师范大学资源与生态研究所
• 3:南京大学地理与海洋科学学院

摘要(Abstract)：

天山北坡受西风环流影响,是对气候变化反应最敏感的地区之一。但由于缺乏高分辨率的古气候记录,对该区域2000 cal yr B.P.以来气候演变过程的认识仍存在分歧,尤其是气候演化模式和水热组合方式等问题。为厘清上述问题,以伊犁盆地2400calyrB.P.以来的泥炭沉积剖面为研究材料,通过对其进行精确定年和高分辨率孢粉研究,重建了天山北坡2400 cal yr B.P.以来的植被和气候演化历史。结果表明:1) 2400 cal yr B.P.以来天山北坡气候经历了暖干―暖湿―冷湿3个阶段,并可与其他地区研究结果进行良好对比。2429―949 cal yr B.P.期间,喜光、喜暖植物含量丰富, PCA axis 1得分指示有效湿度偏低,气候以暖干为主要特征; 949―475 cal yr B.P.期间,区域有效湿度明显增加,气温较高,为中世纪暖期;475―301calyrB.P.期间的小冰期打断了天山北坡气候向暖湿化发展的趋势,此时段内以冷湿为主。2)天山北坡气候变化过程并不稳定,包含短期的气候突变事件,泥炭沉积物记录了以冷湿为主要特征的小冰期,可能是西风环流加强、西风带南移或北大西洋涛动负异常叠加,温度变低导致水面蒸发、植物蒸腾减少等共同作用的结果。

关键词(KeyWords)： 泥炭;孢粉;主成分分析;中世纪暖期;小冰期;天山

Abstract:

Keywords:

基金项目(Foundation): 2019年自治区自然科学基金(2019D01C338);; 自治区高校科研计划(XJEDU2018Y044);; 国家自然科学基金(41961013、41571179)联合资助

作者(Author): 姚付龙,朱诚,夏倩倩,张静,杨海军

DOI: 10.19839/j.cnki.dcxzz.2020.0011

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