The MIS 3 (Marine Isotope Stage 3) was a special period during the past global climate evolution process.It is important for getting more details about MIS 3 for deeply understanding the regional change of paleo-climate and paleo-environment.The paleo-Daocheng Ice Cap is situated in the southeastern Tibetan Plateau,where the glacial remnants (including the oldest moraines in the Hengduan Mountains) have been well preserved,which provides a natural laboratory to study the glacial history and climate change during Quaternary.Although there has been a lot of work in this area,consensus has not reached on the time of the maximum glaciation and whether glacier advance during MIS 3.In this paper,the possibility of MIS 3 glacial advance in paleoDaocheng Ice Cap is explored based on the climatic records (stalagmites,ice cores,marine sediments and pollen data) and the dating data of glacial advance in the plateau (include the paleo-Daocheng Ice Cap) and around areas during MIS 3.The results showed that glaciers had advanced during 43 ～53 ka (MIS 3).This research will provide new data for climate and environment reconstruction.

对黑河下游地区柽柳沙丘沉积剖面进行AMS 14C定年及沉积物粒度和Hg含量的综合分析,探讨了该区域从18世纪中期到21世纪初的气候与环境变化.结果表明:沙丘沉积物以细沙为主,粒度频率分布曲线呈明显的单峰形态,反映了单一的风力沉积作用;＞100 μm的粗颗粒含量变化很好地指示了该区域冬季风的强弱变化,并记录了小冰期末期以来气候转暖的过程以及现代暖期中两个相对寒冷时期——20世纪10-20年代和50-60年代.沙丘沉积物中Hg主要来源于人类的工业活动,剖面Hg含量存在3个峰值,分别对应18世纪末的西班牙美洲地区银矿开采、19世纪中后期的北美淘金热、二次世界大战及战后经济复苏.此外,剖面中有两个样品Hg含量异常升高,其原因可能是1815年和1883年印尼的两次大规模火山喷发而引起的全球Hg沉降增加.

选择位于黑河下游地区的灌丛沙丘为研究对象,利用HC测年初步建立风沙沉积的年代序列,分析了风沙沉积物地球化学元素和粒度作为环境代用指标的气候意义,通过综合分析和区域对比,初步探讨该区域近300年来的气候环境变化.结果表明:常量元素的含量除SiO2外其他元素含量偏低.灌丛沙丘沉积至少记录了3次相对干旱期和3次相对湿润期.其中,1823年前、1905 ～ 1929年、1958 ～ 1973年期间,处于相对干旱期;而1824 ～ 1904年、1930～1957年、1974年至今,处于相对湿润期.黑河下游灌丛沙丘的气候变化对周边及全球气候变化有较好的响应,是研究近代气候变化的理想场所.