论文部分内容阅读
此前,中国晚更新世晚期多年冻土南界的研究有两点不足,一是限于中国北方东段,二是年代数据不够系统.通过对中国北方晚更新世晚期冰缘现象的研究,认为中国北方高纬度多年冻土南界基本上沿38o~40oN(东段)和37o~39oN(西段)延伸,并第1次绘出分布图.同时,综合其他方面的研究成果,重建了晚更新世晚期以来纬度冻土带南界的变迁,并提出26和23~13kaBP有两次寒冷期,年均温在不同地段较今降低8~12℃.
Previously, there were two deficiencies in the study of the southern permafrost region in late-Pleistocene stage in China: one was limited to the eastern part of northern China and the other was that the data were not systematic enough. Based on the study of the late-Pleistocene icy margins in northern China, The southern boundary of permafrost in northern high latitudes extends basically along 38o ~ 40oN (the eastern segment) and 37o ~ 39oN (the western segment), and draws the profile for the first time.At the same time, based on other research results, the late update The change of the southern boundary of latitudinal frozen soil since the late stage of the late World War. It is proposed that there are two cold periods in 26 and 23 ~ 13kaBP, and the average annual temperature is reduced by 8 ~ 12 ℃ in different areas.