晚第四纪黄土古温度定量重建研究进展

Research Progress on Quantitative Reconstruction of Paleotemperature Recorded in Loess Deposit Since Late Quaternary

中国黄土是古气候研究的重要陆相沉积载体。定量重建黄土记录的古温度变化信息对于理解气候变化的机制具有十分关键的作用。过去主要借助磁化率、植硅体、游离铁与全铁、甘油二烷基甘油四醚(GDGT)等代用指标对黄土高原地区黄土记录的古温度变化进行定量研究。在简述晚第四纪黄土古温度定量重建常用方法的基础上,对各种指标的局限性进行了分析。准确定量重建黄土记录的古温度序列需要开展多指标、多方法的交叉检验。

Loess deposit on the Chinese Loess Plateau is an important terrestrial archive for investigating paleoclimatic change.Quantitative reconstruction of loess recording the paleotemperature change is key important factor for understanding the mechanism of climate change.Over the past several decades,magnetic susceptibility,phytoliths,dissociative iron oxide（FeD） and total iron oxide（FeT）,and glycerol dialkyl glycerol tetraethers（GDGT） have been employed to quantitatively reconstruct the temperature change recorded in loess deposit.This paper briefly introduces the regular methods for reconstructing the paleotemperature information recorded in loess deposit since Late Quaternary,and discusses their limitations.Accurate quantitative reconstruction of paleotemperature change recorded by loess deposit needs more proxy indexes and methods for cross-check.