摘要
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32ka BP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本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11C;并且识别出“仙女木期”(包括老—中—新仙女木事件)高分辩率气候变化时段,时间窗为13～9.8 ka BP,这在青藏高原及中国大陆的古气候分析中是首次。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,对中国古气候变化和现代气候预测具有借鉴价值。
During the comprehensive scientific investigations of the Qinghai - Tibet Plateau, sedimentary records of the sections of its hinterland were selected to conduct studies of stratigraphic climatology and isotope climatology. The response characteristics of the climatic change recorded in sediments and the change of isotope abundances coincide very well, and their time yardsticks and resolution powers can also compensate for each other. The sedimentary records and the isotope abundance change cover the change of the palaeoclimatic environment since 32 ka BP in a wider range. What is more significant is that the dry cold oscillation event of the Younger Dryas has been detected accurately and distinctly. The temperature-lowering amplitude produced by fitting of the isotope abundance change may attain 11 C. Moreover, a high - resolution climatic change interval with a time window of 13 to 9. 8 ka BP of the 'Dryas Period '(consisting of the Oldest-Older-Younger Dryas Events) has been recognized. This palaeoclimatic analysis was first performed for the Qinghai -Tibet Plateau and the continent of China. In the climatic change of the postglacial period, there appeared 'early pulsation' (or 'early beating') for the evolution of the plateau hinterland, which is of reference value for the understanding of the palaeoclimatic change and forecast of the modern climate in China.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2000年第4期363-370,共8页
Acta Geologica Sinica
基金
国家可可西里地区综合科学考察项目成果
关键词
湖泊沉积序列
青藏高原腹地
古气候变化
同位素
sedimentary sequence of lakes
response of climatic change
sudden change event of climate
hinterland of the Qinghai-Tibet Plateau
