青藏高原中部色林错沉积物色度反映的全新世区域古气候环境演化

he diffuse reflectance spectroscopy analysis of the sediment, collected from Selin Co, the climate sensitive regions in the central Qinghai-Tibetan Plateau, reveals that the method can reflect paleoenvironmental and paleoclimatic changes. Redness in sediment is primarily related to wet-warm climate, which seems to monitor paleoclimatic changes in the area; brightness has a good correlation with clay, TOC, magnetic susceptibility and CaCO3 (%). As lacustrine sediment becomes coarser, magnetic susceptibility generally increases, CaCO3 (%) decrease, suggested that the climate became warm-wet; otherwise, the climate became cold-dry. 13.33-12.23ka was a very cold period; A sharp fluctuation of redness, brightness and magnetic susceptibility occurred around the Younger Dryas cold event, at about 12.23-10.07ka; 10.68-8.70 ka represented Holocene Megathemal period (Holocene thermal optimum) with the highest redness value of the horizon in the area. 8.70-1.74 ka is warm-wet period; 1.74-0 ka is cold-dry period.