摘要
本文根据歧山剖面的碳、氧同位素记录分析表明，距今１３０ｋａ来，黄土高原中部地区的气候至少经历了８次较大的波动。在万年尺度上，这些波动与全球的趋势基本一致，但在较小的时间尺度上，在大趋势相似的背景下，又有明显差别，反映了气候变化的区域特点。
Carbon,oxygen isotopic records show that at least 8 big climatic changes have takenplace in the central Loess Plateau since 130 ka B. K. During 130 75 ka B. P. environ-ment of the last interglacial period was prevalent in this region,under which climate waswarm and humid,and the first layer of paleosol(S_1)widely developed with two clear pe-dogeneses indicating two much warm and humid time stages.In about 75ka B. P. ,theplateau entered into the last glacial age,in which the first layer of loess(L_1)was deposit-ed. But around 60ka B. P. and 30ka B. P. ,each saw a relatively warm and humid climaticenvironment in the general background of dryness and coldness,each having one weakpedogenesis formed. Since about 10ka B. P. ,the region has been in the post-glacial e-poch.9-6ka B. P. was the climatic optimum of Holocene with the highest air tempera- ture;subsequently,air temperature began to drop and frequently fluctuated until now. On the whole,in the central Loess Plateau,paleoclimatic change since 130ka B. P. hasbeen with the concurrence of the global trend on the scale of ten-thousand year;on thesmaller time scale,however,it has its own obvious regional features.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1996年第1期17-22,共6页
Marine Geology & Quaternary Geology
基金
地质矿产部"八.五"基础研究8502217项目
地矿部环境地质开放实验室K94006项目
关键词
碳
氧
同位素
古气候
黄土高原
气候变化
carbon and oxygen isotope palaeoclimate the Loess Plateau 130ka B. P.
