论文部分内容阅读
以河西走廊东段石羊河尾闾青土湖为例,通过对志云村剖面沉积气候记录的研究,证实季风边缘区百年以上时间尺度的气候变化,具有暖湿、冷干的阶段性特征自6000aBP以来,河西走廊东段湖泊旋回经历了四次湖退和三次湖进过程,除最后一次湖退直至干涸受人类活动影响较大外,其它主要是气候阶段性变化的结果,青土湖全新世中期以来的演变,具有沉积连续、沉积速率大和分辨率高的特点,不仅可以作为古环境与古气候变化的自然记录,而且可根据湖泊沉积旋回揭示东亚季风的强度变化.
Taking the Qinghu Lake in Shiyanghe tail of eastern Hexi Corridor as an example, through the study of sedimentary climate record of Zhiyuncun section, the climatic change on the monsoon edge area over one hundred years and above is confirmed, with warm, wet and cold dry period characteristics Since 6000aBP, the lakes in the eastern Hexi Corridor experienced four cycles of lake retreat and three lakes cycles, except for the last retreat until dry-up, which is greatly affected by human activities. The other is mainly the result of the climate stage change. The Holocene Holocene Holocene, Since mid-term evolution, with the characteristics of continuous deposition, large deposition rate and high resolution, it can not only be used as a natural record of palaeoclimate and paleoclimate changes, but also reveal the intensity change of East Asian monsoon according to sedimentary cycles of lakes.