摘要
由南疆罗布泊地区台特玛湖沉积物多种地质记录的综合分析表明,近25.0kaBP以来此地区气候与环境演化的过程和特征与新疆其它地区基本一致。多手段的综合研究,揭示了近25.0kaBP以来台特玛湖气候与环境的变化经历了7次相对暖干、5次相对冷湿和1次相对暖湿变化,而且全新世期间历次的气候变化与具有高分辨率的敦德冰芯记录以及北半球气候变化的过程上基本一致,所记录的气候与环境演化过程呈现出明显的西风型环境演变特征。唯一在7.0～6.0kaBP期间出现的相对暖湿的环境特征应该是真正意义上的全新世大暖期最盛期的体现,可能与此时增强的西南夏季风势力影响到本地区有关。
Studies on paleoclimatic and paleoenvironmental evolution in the Taitema Lake area,Lop Nur Lake region in the Tarim Basin, south Xinjiang, are not so sufficient. In order to reveal the characteristics of paleoclimatic and environmental evolution in this area,in this paper,the lacustrine sediments from a drilling core since 25 Ka B.P. in the Taitema Lake area in Lop Nur region are analyzed based on the stable carbonate isotopic composition,susceptibility,pollen and geochemical data of lacustrine sediments. The study reveals that the paleoclimate fluctuated frequently during the past 25 Ka B.P. Features of paleoclimatic evolution in the Taitema Lake area were basically identical to those revealed by other geological records in Xinjiang and other regions in the world. Paleoclimatic changes were characterized by: during the cold periods,the relative humidity increased and the lake water level was risen;but during the warm periods,the aridity became more serious,and the lake water level was lowered;and 7 warm-dry periods,5 cold-humid periods and 1 warm-humid period can be identified.
出处
《干旱区地理》
CSCD
北大核心
2005年第2期183-187,共5页
Arid Land Geography
基金
国家自然科学基金(49761007号)
教育部高等学校骨干教师资助计划
