沉积学报2018，Vol.36Issue(3)：521-530,10.DOI:10.14027/j.issn.1000-0550.2018.041
3500年来祁连山中段天鹅湖岩芯记录的沉积环境变化
A 3500 Year Environmental Changes Recorded by Sediment of Tian ' E Lake, Central Part of the Qilian Mountains, China
摘要
Abstract
Lake sediments, especially the inland-mountain closed lake sediments may record changes of continuous paleoclimate, which is one of the important archives for paleoclimate reconstruction. Sediment core retrieved from the Tian'E Lake ( TE Lake) in the central part of the Qilian Mountains was used to reconstruct climatic changes during the past 3500 year based on the analysis of total organic carbon (TOC), elemental and mineral compositions. The chronology of TEB core was established using AMS 14 C dates of ten terrestrial plant residues. The results showed that carbonate content was controlled by the supplementary of groundwater, further indicating the precipitation around the catchment. Accordingly, the precipitation of TE Lake had a decreasing tendency between 1534 BC-1300 AD based on carbonate content. Especially during the Medieval Warm Period (MWP) (720-1300 AD), the precipitation reached the lowest values in the last 3500 years. There were three-times of humid conditions during the Little Ice Age ( LIA) which began at 1300 AD and reached the most humid condition during the period of 1600-1730 AD. TE Lake was characterized by assembly of warm-dry and cold-wet climate transitions in the region resulted from the influ-ence of Westerlies. Moreover, variations of local climate during LIA recorded by TE Lake sediments were more unsta-ble than that during the MWP .关键词
祁连山/天鹅湖/晚全新世/环境变化/中世纪暖期/小冰期Key words
Qilian Mountain/Tian' E Lake/late Holocene/environmental changes/Medieval Warm Period/Little Ice Age分类
天文与地球科学引用本文复制引用
闫天龙,王振亭,贺建桥,黄小忠,夏敦胜,王宗礼..3500年来祁连山中段天鹅湖岩芯记录的沉积环境变化[J].沉积学报,2018,36(3):521-530,10.基金项目
国家自然科学基金项目(41571182) （41571182）
兰州大学西部环境教育部重点实验室开放基金(lzujbky-2016-bt-01)National Natural Science Foundation of China,No. 41571182 （lzujbky-2016-bt-01）
Open Foundation of MOE Key Laboratory of Western China' s Environmental System of Lanzhou U-niversity,No. lzujbky-2016-bt-01 （）
