An Absolute-Dated High-Resolution Palaeoclimate Record between 4 400 and 150 a B.P. from Dragon Cave, Eastern Loess Plateau, China
详细信息
- 责任者：Dong Jinguo (College of Geography Science ; Nantong University ; Nantong 226007 ; China) ; Shen Chuanzhou
- 刊名：Scientia Geographica Sinica
- 出版年：2012
- 卷期：31(9)
- 关键词：全新世 ; Holocene ; 石笋 ; stalagmites ; 黄土高原 ; Loess Plateau
- 页码：p.1136-1141
- 图表：4 illus., 2 tables, 29 refs.
- 分类号：1400
- issnNo：ISSN1000-0690
- isbnNo：CN22-1124/P
摘要
The Dragon Cave (38°46′N,113°16′E) is located at transition between semi-humid and semi-arid areas in the middle temperature zone of China.With a relatively stable boundary condition,the authors interpret the δ18O of speleothem calcite as most indicative of the amount of summer monsoon precipitation,although temperature and other factors might have some minor impact.An unusual abrupt weak summer monsoon at 2 550~2 000 a B.P. indicates a mega-drought event,supported by historic archives.The spectral analysis of δ18O time series yields a solar activity-related 106-yr periodicity.However,comparing to a weak solar activity at 2.7 ka B.P., a 100-200-yr lag of the cave-inferred mega-drought event implies a complicated mechanism of short-term solar forcing on monsoon system.