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在前人研究的基础上,以柴达木盆地察尔汗地区ZK2钻孔沉积物为研究对象,选取古气候替代指标——色度,分析了察尔汗地区近130 kaB.P.以来气候的变化,揭示了该区对全球气候变化的响应模式以及古气候变化在色度指标上的表现。结果表明:末次间冰期以来,察尔汗地区环境由温暖湿润-冷暖频繁波动-干热环境变化,色度L*,a*,b*具体表现为在不同水平的波动。其中b*较L*,a*能更敏感地反映古环境的变化,在温暖湿润的间冰期,b*值趋向于高值区间;而在寒冷干燥的冰期,b*值趋向于低值区间波动。这种整体波动的趋势与氧同位素的5个阶段基本吻合。
Based on the previous studies, taking ZK2 borehole sediments in Chaer Khan area of Qaidam Basin as the research object, the palaeoclimate alternative index-chromaticity was selected to analyze the climate since Chakhan region nearly 130 kaB.P. Reveals the region’s response to global climate change patterns and paleoclimatic changes in the performance of colorimetric indicators. The results show that since the last interglacial period, the environment of Chaer Khan fluctuates from warm and humid to warm and cold with frequent changes in the dry and hot environment, and the chromaticity L *, a * and b * manifest themselves at different levels. Among them, b * is more sensitive to the change of paleoenvironment than that of L * and a *. In the warm and wet interglacial period, b * tends to the high value; in the cold and dry ice, the b * value tends to the low value fluctuation. This trend of overall fluctuations basically coincides with the five stages of oxygen isotopes.