地理学报 ›› 1999, Vol. 66 ›› Issue (6): 543-549.doi: 10.11821/xb199906008

• 论文 • 上一篇    下一篇

石笋微层的谱分析和北京地区1千年来的气候演变

秦小光, 刘东生, 谭明, 王先锋   

  1. 中国科学院地质研究所,北京100029
  • 收稿日期:1998-05-18 修回日期:1998-08-08 出版日期:1999-11-15 发布日期:1999-11-15
  • 基金资助:
    国家自然科学基金项目(49894170,49672134);中国科学院重大项目(KZ951-A1-402)、重点项目(KZ952-J1-014)资助

TheSpectralAnalysisfor a Lam ina ThicknessSeriesof a Stalagm ite in Beijing and the Clim ateVariation in Last1 ka

QIN Xiao-guang, LIU Tong-sheng, TAN Ming, WANGXian-feng   

  1. Laboratory of Speleothem and Paleoclim atology, Institute of Geology, CAS, Beijing 100029
  • Received:1998-05-18 Revised:1998-08-08 Online:1999-11-15 Published:1999-11-15
  • Supported by:
    National Natural Science Foundation,No.49894170 and 49672134;the key project of Chinese Academy of Sciences KZ951-A1-402 and KZ952-J1-014

摘要: 北京石花洞石笋微层是北京地区气候变化最好的高分辨率地质记录之一。为了研究北京地区近1 千年来气候演化历史中蕴含的周期性规律, 我们采用滑动谱分析的方法提取了石笋微层厚度曲线包含的气候变化周期信息, 发现石笋微层厚度变化最主要的周期成分是2 年、3.3年、5 年~6 年、10 年~12 年、16 年~18 年、133 年和194 年等几个周期, 包含了与现代气候年际振荡相同的准3.5 年周期、准5~6 年周期和11 年周期。而且不同时期有不同的主导周期,在微层厚度大的时期 (W 阶段), 各种周期成分强度大。

关键词: 石笋微层, 气候周期, 滑动谱图象分析

Abstract: The stalagm ite lam ina is one ofthe high-resolution records in the paleoclim ate research. In order to study the cycles ofclim ate oscillation in Beijing area and their shifts in the last1 ka, a m oving spectralanalysis is used to revealthecharacteristicsofcyclesin the lam inathicknesssequence ofa stalagm ite from Shihua Cave. Itisfound thatthedom i- nantcycles in the tim e series are of2yr, 3.3yr, 5~6yr, 10~12yr, 16~18yr, 133yr and 194yr. Som e ofthese cyclesare close to thecycle of3.5yr, the cycleof5~6yrand the cy- cle of11yrthatare found in m any m odern clim aticrecord. Itm eansthatthe dynam icforc- ing and the clim ate oscillationsin thelast1ka are sim ilarto thoseofm odern clim ate. The 3.3yrcycle isstrongerand continuous before D4 and the 5.8yrcycle is m ore distinctthan the 3.3yrcycle after D4. There are differentdom inant clim ate cycles in different periods. Usually, the dom i- nantcyclesare strongerand clearerwhen thelam inaearethicker. Thedom inantcyclesare weak when the lam inae are thinner. Itm ay reflectthatthe stronger clim ate cycles in the wetperiod could leave m uch clearer prints in the stalagm ite lam inae. Therefore the lam i- nae thicknesscan beused asaproxy ofclim ateoscillation in northern Chinaifthesam ples are carefully selected. Itis noticed thatthe cycles m ay m erge, branch, replace, abruptly appear, disappear or shift in frequency w ith the clim ate evolution. These phenom ena dem onstrate that the clim ate oscillation is nonlinear. Itis very im portantforunderstanding the clim aticoscilla- tion ofBeijing area in the last1 ka.

Key words: stalagm ite lam ina, clim ate cycle, m oving spectralanalysi

中图分类号: 

  • P467