%0 Journal Article
%T ENVIRONMENTAL CHANGES REFLECTED BY CORE SEDIMENTS SINCE 8.4ka IN NAM CO, CENTRAL TIBET OF CHINA<br>西藏纳木错深水湖芯反映的8.4ka以来气候环境变化*
%A GDaut
%A RMusbacher
%A ASchwalb
%A Zhu Liping
%A Wang Junbo
%A Lin Xiao
%A Ju Jianting
%A Xie Manping
%A Li Minghui
%A Wu Yanhong
%A GDaut
%A RMusbacher
%A ASchwalb
%A <br>朱立平
%A 王君波
%A 林 晓
%A 鞠建廷
%A 谢曼平
%A 李明慧
%A 吴艳红
%A G.Daut
%A R.Musbacher
%A A.Schwalb
%J 第四纪研究
%D 2007
%I 
%X The Tibetan Plateau is a sensitive area to global changes due to its high elevation and frail surface ecosystem. This huge plateau induces and enhances the Asian monsoon that influences the plateau itself, East China, and even the whole Asia. Pursuing the changing history of monsoon and its impact in this environment-sensitive area is a key content for understanding the rules of climatic changes. Here, we present the initial results from a core sediment from Nam Co, Central Tibet to elucidate the Holocene environment changes in this area. By using echo-seismic profiler and hydro-echo-sounder, we investigated the water depth distribution of the most areas of the lake. One 332-cm long PISTON core was successfully taken at the east part of the lake at the site of 60m water depth. 12 AMS 14 C dating data from top to bottom established a good time sequence of this core. TOC, TN, n-alkanes, grain-size, Fe/Mn, Sr/Ba, and CaCO3 content were analyzed with the sample intervals from 1cm to 10cm. Results showed that since ca.8400aB.P. the environmental change in this region can be divided into three stages. The early stage is from ca.8400~6400aB.P. that is characterized by slight shifting from warm to cold with a cold-dry process during 8100~7800aB.P. The middle stage was from 6400~2900aB.P., during which the climate changed from warm-humid to cold-dry. However, around 2900aB.P. the climate once was slightly cold but strongly dry. The late stage was from 2900aB.P. to present that showed a general tendency toward cold-dry. The first temperature decline was around 1700~1500aB.P. , following which the temperature was once increased. But the temperature decreased again around 800~300aB.P. , which might be the results of the Little Ice Age.
%K Tibetan Plateau
%K Nam Co
%K lake sediments
%K environmental change
%K since 8
%K 4ka<br>青藏高原
%K 纳木错
%K 湖泊沉积
%K 环境变化
%K 8.4ka以来
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=00B54469FEB83768&yid=A732AF04DDA03BB3&vid=DB817633AA4F79B9&iid=E158A972A605785F&sid=4964C30D71DF45FF&eid=0A8675156EB60B87&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=8&reference_num=75