近130ka中国黄土磁化率气候记录与南极冰芯气候记录

CLIMATIC RECORDS OF CHINESE LOESS SUSCEPTIBILITY AND OF ANTARCTIC ICE-CORE IN LATELY 130 000a

黄土高原中部的陕西泾阳、旬邑黄土剖面具有高分辨率气候记录,记录了130ka 以来的气候波动,一些细微的气候波动也被记录下来。位于大陆的黄土磁化率气候记录可以与南极冰芯气候记录对比。结果表明:Lorius 与 Jouzel 等将冰芯同位素曲线划分为 A、B、C、D、E、F、G、H 冷暖阶段,可与黄土磁化率气候曲线划分的1、2、3、4、(5、6、7)、8,9、10冷暖阶段对比。其中冰芯记录所反映的 A、C、E、G(或黄土记录反映的1、3、5、6、7、9)为暖阶段:B、D、F、H(2、4、8、10)为冷阶段。总之,黄土磁化率记录曲线与冰芯气候记录曲线的形态极为相似,指示了黄土高原地区的大陆气候变化与极地气候变化同受全球变化的影响。这证明了极地冰量变化与东亚大陆冬、夏季风强弱变化,是全球气候变化在极地与大陆的两种表现形式。黄土记录的气候变化时间滞后于冰芯记录,可能暗示着大陆气候变化滞后于极地气候变化。

Jingyang and Xunyi sections in Shaanxi province,are characterized by high-resolution climatic records,which marks the fine climatic fluctuations in the loess area in the last130,000a.That,the climatic information in the continent loess can be compared with records of Antarctic ice-core.It wos found that the eight cold-warm stages,,4,B,C,D,E, F,G,H,divided in terms of ice-core information by Lorius and Jouzel et al,can be compared with the 1,2,3,4,(5,6,7),8,9,10 stages based on the loess curve.A,C,E,G or 1,3,5,6,7,9 indicate warm climate,while B,D,F,H or 2,4,8,10 were formed during cold stages.In a word,the shapes of the two curves bear much resemblance.It does convey the information that climatic changes on both the Loess Plateau and in the polar area were all greatly influenced by global climatic variation.Illustrateed with both the variation of ice volum and winter and summer Monsoonare resulted from the global climatic changes,the time inconsistency of the two distinct records imply that the climatic changes in continent may be lagged behind that of the polar area.