青藏高原腹地32kaB.P.以来的古气候变化

Palaeoclimatic Change for Since 32kaB.P.in the Hinterland of Qinghai-Xizang Plateau

在青藏高原综合科学考察中 ,选择其腹地系列剖面的沉积物记录进行地层气候学和同位素气候学的研究 .沉积物记录的气候变化与同位素丰度变化的响应关系十分吻合 ,其时间尺度和分辨率也能够互为补偿 ,在较大范围内覆盖了 3 2kaB .P .以来的古气候环境变化 .更为有意义的是 ,清晰准确地检出新仙女木期气候冷干颤动事件 ,用同位素丰度变化拟合的降温幅度可达 11℃ .这一气候事件与高原周边地区和中国东部地区以及全球变化均可进行对比 .而且冰后期气候变化中 ,高原腹地的发展过程具有“早博”(或“早跳”)现象 .

On the comprehensive scientific survey of Qinghai-Xizang Plateau, the selectical sedimentary recorder of it's systematic section proceeded study for the stratal climatology and the isotope climatology. The reactic relation are evry identification for both the climatic change of record of stratal sediment and the change of isotope abundance, before then mutual compensate could produce with the time yardstick and it's resolving power. Since the 32kaB. P., this region covered the environment change of the ancient climatic in the greater range of Qinghai-Xizang Plateau. This is meaningest, this distinctal accurate inspected the vibrate event of the cool and dry of climate of the Younger Dryas, and there colling range is 11°C for the imitate change used the isotope abundance. This climatic event all progress contrasted the peripheryal region of the Qinghai-Xizang Plateau and the eastern of China and the global change. In the climatic change of the postglacial period, there are appearanle of the 'early pulsation' (or 'early beating') for the evolutional process of the plateau hinterland.