摘要
本文通过在洛川黄土地层中采样和测定,绘制出了黄土地层δ^(13)C变化曲线。将之与美、欧、深海、极冰等多种气候曲线做对比,结果表明它是一种极敏感的代用性气候指标,而且它对湿度反应最为灵敏。配合过去所研究过的用全铁含量来反映温度变化的作法,使我们在把δ^(13)C曲线转换成直接气候指标方面更向前趋近了一步。
δ13 curve of loess strata can be well correlated in detail with different climate curves from Europe, America, deep sea. and ice sheet in Antarctic. It proves that OO13C is a very sensitive substitute climate index. It mainly reflects the moisture (precipitation) ,while the total iron oxide abundance studied before mainly reflects the temperature. All these give a possibility for us to transform the substitute climatic index into direct index in the future.
关键词
碳同位素
古气候
第四纪
黄土
Carbon isotope, Palaeoclimate, Quaternary, Loess
