干旱区生态环境知识资源中心(Arid): 青海湖地区冰消期以来气候变化的黄土记录

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	青海湖地区冰消期以来气候变化的黄土记录
其他题名	Palaeoclimate Changes Recorded by Loess Deposit around Qinghai Lake (Northeastern Qinghai-Tibetan Plateau)since Last Deglaciation
	赵存法 1; 鹿化煜 2; 周亚利 1; 弋双文 2
ISSN	1006-7493
出版年	2009
卷号	15 期号:1 页码:135-140
中文摘要	青海湖周围堆积着很多黄土和风沙沉积,这些风成沉积序列是过去气候变化的良好记录.相对于湖泊沉积,这些沉积物受到的研究较为薄弱.对青海湖南岸的黄土堆积进行了光释光年代学、磁化率、Fe/Mg值、粒度和有机质含量等气候替代性指标测量.在具有绝对年代标尺控制的基础上,结合气候替代性指标变化特征的分析,表明冰消期以来青海湖地区的古气候经历了多次的冷暖和干湿变化过程:14～9 ka间气候前期相对冷干,后期转为凉干,其中可能在11 ka左右存在一次暖湿事件;9～2.5 ka间气候呈暖湿状态;2.5 ka以后的地层扰动较大.黄土和湖泊沉积记录的环境变化过程具有可比性.
英文摘要	Loess and aeolian deposits were found in the area around Qinghai Lake.It is well known that loess is regarded as one of the best terrestrial archives of palaeoclimatic and palaeoenvironmental change.However,investigation on the loess and the aeolian deposits,compared with the lacustrine sediments,is limited and weak in this region.In this paper we dated the loess section by the optically stimulated luminescence (OSL) method,and measured the magnetic susceptibility,Fe/Mg value,grain size distribution and organic matter contents of the Heimahe loess profile.Based on the absolute ages and variations of these climatic proxy indicators,our results show that there are clearly warm/cold and humid/arid alternation in Qinghai Lake area since the late deglaciation.During around 14-9 ka,the palaeolclimate was cold and dry,and it was better only at about 11 ka.A distinct climate ameliorating occurred from 9 ka to 2.5 ka.Strong disturbance by human activity appeared in loess deposit since 2.5 ka,so it is difficult to analyze the climatic change during the latest Holocene.The environmental changes inferred from the loess deposit are in well comparison with the lacustrine records.
中文关键词	黄土 ; 冰消期 ; 环境变化 ; 青海湖地区
英文关键词	loess the last deglaciation environmental change Qinghai Lake area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:3564440
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223740
作者单位	1.中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国; 2.南京大学,地理与海洋科学学院, 南京, 江苏 210093, 中国
推荐引用方式 GB/T 7714	赵存法,鹿化煜,周亚利,等. 青海湖地区冰消期以来气候变化的黄土记录[J],2009,15(1):135-140.
APA	赵存法,鹿化煜,周亚利,&弋双文.(2009).青海湖地区冰消期以来气候变化的黄土记录.,15(1),135-140.
MLA	赵存法,et al."青海湖地区冰消期以来气候变化的黄土记录".15.1(2009):135-140.