可可西里地区0.9Ma以来气候演变特征研究

发布时间：2018-04-15 21:33

本文选题：可可西里 + .Ma　；参考：《干旱区资源与环境》2017年06期

【摘要】：选择青藏高原腹地可可西里地区为研究区,以古地磁测年结果为年代框架,应用轨道调谐方法建立了BDQ06孔的年代标尺。通过对BDQ06孔沉积物粒度、磁化率、总有机碳及色度等指标的分析,重建了可可西里地区0.9Ma以来古气候演化序列。气候演化过程划分为5个阶段:阶段5(929~660ka BP)暖湿和冷干交替变化;阶段4(660~460ka BP)气候向偏冷偏干方向发展;阶段3(460~360ka BP)气候温和偏干;阶段2(360~160ka BP)气候暖湿冷干波动频繁交替;阶段1(160~5ka BP)暖湿冷干组合。同时该区湖泊沉积物环境指标的变化规律和深海氧同位素曲线在冰期-间冰期旋回尺度上有较好的一致性,但也出现不同的变化特征,说明本区既表现出全球一致的气候特征,同时也表现出一定区域特征,可能与青藏高原的构造隆升有关,这对于研究区域气候变化与全球气候变化有着重要的意义。
[Abstract]:The Kexili area in the hinterland of the Qinghai-Xizang Plateau is selected as the study area and the paleomagnetic dating results are taken as the chronological framework. The track tuning method is used to establish the age scale of the BDQ06 hole.The paleoclimate evolution sequence since 0.9Ma in Hoh Xili area was reconstructed by analyzing the grain size, magnetic susceptibility, total organic carbon and chroma of BDQ06 pore sediments.The process of climate evolution can be divided into five stages: alternating change of warm and wet (4(660~460ka) and cold / dry (4(660~460ka) in stage, development of climate (4(660~460ka) towards cold and dry (4(660~460ka), mild and dry (climate) in 3(460~360ka (stage), frequent fluctuation of warm and wet (cold / dry) in 2(360~160ka (phase);Phase 1(160~5ka 1(160~5ka) warm, wet and cold dry combination.At the same time, the variation law of lake sediment environmental index and the deep sea oxygen isotope curve are consistent on the scale of glacial to interglacial cycle, but there are also different variation characteristics, which indicates that the region has global consistent climate characteristics.It may be related to the tectonic uplift of the Qinghai-Xizang Plateau, which is of great significance to the study of regional climate change and global climate change.
【作者单位】：山西师范大学地理科学学院;兰州大学资源环境学院冰川与生态地理研究所;陕西师范大学旅游与环境学院;
【基金】：国家自然科学基金项目(编号:40871057) 国家青年科学基金项目(编号:41401226)资助
【分类号】：P532

【相似文献】