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长尺度的湖泊记录的对比研究,可以避免局部的环境因素的干扰,能较好地辨析出大区域乃至全球气候变化的特点。我国目前可供较长时间尺度对比研究的湖泊沉积记录只有青藏高原北部柴达木、云贵高原滇池和青藏高原东部若尔盖古湖,本文根据若尔盖盆地RM孔、柴达木盆地ZK-336及CK-6孔和滇池盆地参1井等钻孔的湖泊深钻记录比较研究,探讨了中更新世以来我国环境的区域分异特点。结果表明:中更新世早期(780～480ka B.P.),青藏高原东部的若尔盖与北部的柴达木地区均以相对湿润的环境为主,但云贵高原似乎表现为暖干的气候特点;中更新世晚期(480～160 ka B.P.),柴达木盆地和若尔盖地区一样,均表现出明显的趋冷趋干的气候特点,柴达木盆地湖泊为一明显的退缩时期,而云贵高原,与青藏高原相一致的是气候的变冷,并且越到后期,寒冷程度加剧,不一致的是该区明显趋湿;晚更新世以来(160～0 ka B.P.),柴达木盆地与若尔盖古湖两者湖泊记录的气侯波动基本一致,但柴达木盆地基本表现为干旱的背景,波动的幅度似乎也不及若尔盖盆地,这可能在于后者处于季风气候的边缘,对气候变化的响应尤为敏感,而位于云贵高原的滇池盆地,和若尔盖地区也
The comparative study of long-term lake records can avoid the interference of local environmental factors and can well distinguish the characteristics of climate change in large areas and even in the world. In our country, the lake sediment records that can be compared and studied for a long time scale are only the northern Qaidam Plateau, the Dianchi Plateau of Yunnan-Guizhou Plateau and the Ruoergagu Lake in the eastern Qinghai-Tibet Plateau. According to the records of ZK-336 and CK- 6 wells and the Dianchi Basin, Senate 1 borehole and other deep borehole lake drilling records to study the characteristics of China’s regional environment since the mid-Pleistocene. The results show that: in the middle of the Pleistocene (780 ~ 480ka BP), the Ruoergai in the eastern Tibetan Plateau and the Qaidam in the north are relatively humid, but the Yunnan-Guizhou Plateau seems to be characterized by warm and dry climate. In the middle Pleistocene In the late period (480 ~ 160 ka BP), the Qaidam Basin and the Zoige area show obvious climatic and cooling characteristics. The Qaidam Basin lacustrine lake is an obvious period of retreat. However, the Yunnan-Guizhou Plateau, It is consistent with the fact that the climate is becoming colder and more cold in the later stages and aggravating. The inconsistency is that the area is significantly wetter. Since the late Pleistocene (160 ~ 0 ka BP), both the Qaidam Basin and the Ruoergou Lake The recorded climate fluctuations are basically the same. However, the Qaidam basin basically shows arid background with no fluctuations as much as the Zoige Basin. This may lie in that the latter is at the edge of the monsoon climate and is particularly sensitive to climate change. Plateau Dianchi Basin, and Ruoergai region also