论文部分内容阅读
青藏高原自然环境受人类干扰相对较小,为利用古孢粉记录重建气候因子提供了可能,高原过去气候因子的重建对于预测未来气候变化趋势有重要意义.通过选取的29条高原化石孢粉记录,利用现代类比法和化石孢粉点与高原气温的函数关系,把化石孢粉点古气温转化为青藏高原古气温,重建了高原全新世1月和7月古气温序列.结果表明:对于1月和7月气温而言,全新世早期(11.5~8.5ka BP)为气温波动上升期;全新世中期(8.5~4.6 ka BP)为全新世大暖期,气温整体高于现代;全新世晚期(4.6 ka BP~至今)又可分为两个阶段,一个是4.6~2.4 ka BP,在此阶段1月和7月气温都有减小的趋势,另一个阶段则是2.4 ka BP至今,气温出现反常的趋势.
The natural environment in the Qinghai-Tibet Plateau is relatively less disturbed by human beings, which makes it possible to record and reconstruct climatic factors using ancient sporopollen. The reconstruction of past climatic factors in the plateau is of great significance for predicting the future climate change trend. By selecting 29 plateau fossil pollen records , The paleoclimate temperature sequence of the Holocene January and July in the plateau was reconstructed by using the modern analogy method and the fossil pomegranate point as a function of the plateau temperature.The paleoclimate temperature of the fossil palynoflare was transformed into the Paleogene temperature of the Qinghai-Tibet Plateau.The results showed that for 1 In the mid-Holocene (8.5 ~ 4.6 ka BP), the Holocene Megathermal experienced a higher temperature than the modern Holocene; the late Holocene (11.5 ~ 8.5ka BP) (From 4.6 ka BP up to now) can be divided into two phases, one from 4.6 to 2.4 ka BP. During January and July, the temperature tends to decrease, while the other phase is from 2.4 ka BP up to now. The temperature Anomalous trends appear.