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在青藏高原南部空姆错钻取了一根浅湖芯,对其中时间跨度约为50年的剖面按7年间隔对其中陆源正构烷烃(C_(25),C_(27),C_(29),C_(31))进行了提取分析。通过将这些生物标志物的氢同位素比值与附近浪卡子气象站和拉萨气象站的气象参数记录进行比较,发现这些生物标志物的δD值与生长季节时段的平均气温显著相关,而与生长季节时段的降雨量和相对湿度的相关性差,说明陆源沉积正构烷烃的氢同位素比值主要记录了气温信号,可以被用于古温度重建。
In the south of Qinghai-Tibet Plateau, a shallow lake was drilled with a shallow lake core, and the section with time span of about 50 years was used to investigate the distribution of terrigenous alkanes (C 25, C 27, C 29 ), C_ (31)) were extracted and analyzed. By comparing the hydrogen isotope ratios of these biomarkers with the meteorological parameters of nearby Langkawi weather station and Lhasa weather station, the δD values of these biomarkers were found to be significantly correlated with the mean temperature during the growing season, The correlation between rainfall and relative humidity is poor, indicating that the hydrogen isotope ratio of ternary alkanes in terrestrial sediments mainly records the temperature signal and can be used for palaeo-temperature reconstruction.