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过去2.5百万年间黄土与深海古气候变化周期的对比分析 被引量:7

COMPARISON OF PALEOCLIMATIC VARIATION PERIODICITY BETWEEN LOESS AND OCEAN OVER THE PAST 2.5Ma
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摘要 过去2.5Ma间宝鸡黄土粒度记录和深海氧同位素曲线的Fourier功率谱分析结果表明:在1.6Ma以上部分,两者的周期性相当一致;但在2.5—1.6Ma时段,两者的周期记录差异很大.深海氧同位素曲线记录的全球大陆冰量变化周期以与地轴倾斜度有关的0.041Ma为主,而黄土粒度曲线记录的内陆风力强度变化周期则以与偏心率有关的0.4Ma和0.1Ma为主.造成这种异同的原因是:在2.5—1.6Ma时段,内陆风力强度变化主要受地球轨道变化驱动,而从1.6Ma前开始,转而主要受全球大陆冰量变化驱动. This paper presents Fourier power spectra of the grain-size time series at Baoji,regarded as a proxy of variations in winter monsoon strength and generated by employing orbital tuning approach developed by SPECMAP project,and the marine δ18O time series,regarded as an indicator of global continent ice volume,in order to make a comparison of paleoclimatic variation periodicity between loess and ocean over the past 2.5Ma. Results obtained indicate that periodicities of two records are similar by and large in the past 1.6Ma and considerably different in the interval of 2.5 to 1.6Ma B.P.In the latter interval the dominant period of global continent ice volume as indicated by the marine δ18O record is about 0.041Ma,related to the obliquity,but me dominant periods of variations in winter monsoon strangth as indicated by the grain-size record are about 0.4Ma and 0.1Ma,related to the eccentricity of the Earth’s orbit.
作者 余志伟
出处 《地球物理学报》 SCIE EI CSCD 北大核心 1994年第1期128-131,共4页 Chinese Journal of Geophysics
关键词 古气候 周期 黄土 深海 对比 Paleoclimatic periodicity,Comparison between the continents and the oceans,Baoji loess grain-size record.
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参考文献3

  • 1丁仲礼,第四纪研究,1991年,3卷,336页
  • 2丁仲礼,第四纪研究,1989年,1卷,24页
  • 3刘东生,黄土与环境,1985年

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