不同纬度黄土-古土壤赤铁矿含量差异及其气候指示意义OA北大核心CSTPCD

In the context of global warming,the warming amplitude of the Arctic and the Third Pole(Tibetan Plateau)exceeds that of the rest of the world,yet their warming amplitude and mechanism remain unclear.Therefore,it is imperative to study different climate recorders over dif-ferent time scales.This paper employs hematite to study the warming effects from the last interglacial to the last glacial period.Diffuse reflectance spectroscopy and chromaticity methods are used to quantify the hematite in three continuous loess-paleosol sequences deposited in Siberia,Russia,Xifeng on China's Loess Plateau,and Ganzi in the western Sichuan Plateau,revealing the climate information contained within.The results show that:(1)The combination of diffuse reflectance spectroscopy and chromaticity method is an effective way to quantify hematite.(2)At large spatial scales,hematite is mainly influenced by temperature rather than precipitation.(3)During the last interglacial and glacial cycles,the range of temperature change was greater at higher latitudes than at lower latitudes.The"orbital-scale disparity"in temperatures at different latitudes may be a com-prehensive reflection of the differences in orbital-scale solar radiation and intra-annual solar radiation variations.