干旱区生态环境知识资源中心(Arid): 青藏高原甜水海盆地MIS3阶段湖泊沉积与环境变化

Arid

	青藏高原甜水海盆地MIS3阶段湖泊沉积与环境变化
其他题名	A HIGH RESOLUTION MIS 3 ENVIRONMENTAL CHANGE RECORD DERIVED FROM LACUSTRINE DEPOSIT OF TIANSHUIHAI LAKE, QINGHAI-TIBET PLATEAU
	李世杰 1; 张宏亮 1; 施雅风 1; 朱照宇 2
ISSN	1001-7410
出版年	2008
卷号	28 期号:1 页码:122-131
中文摘要	青藏高原西北部甜水海盆地地处内陆干旱区和喀喇昆仑山的东侧雨影区，气候环境极端干旱。但多次考察结果揭示晚更新世时期存在着大湖和高湖面的地质证据。为了探讨该地区过去气候与环境的演变历史，在甜水海盆地（海拔4840m）进行钻探采得沉积岩芯56．32m（TS95），通过对沉积岩芯其中一段的粒度、生物、同位素及地球化学多指标综合分析，探讨了MIS3时期甜水海地区气候环境演化过程。沉积岩芯显示沉积物岩性变化频繁，记录着湖面多次波动、沉积环境多变的演化过程，分别在59～56kaB．P．，49～47kaB．P．，4541kaB．P．，35．5～34．OkaB．P．和28～25kaB．P．期间存在高湖面和湖水稀释。在其多环境指标的记录中，Heinrich事件和DO旋回均有反映，揭示了全球变化信号在研究区的响应。同时，不同高湖面阶段内部环境波动也较明显，差别较大，其产生原因也各有不同，归结为3种情况：1）由于气候变暖导致冰雪融水补给增加而产生的高湖面；2）由于冷湿气候导致的高湖面；和3）由于暖湿气候导致的高湖面。本研究揭示出了MIS3时期气候频繁波动的特征和气候的不稳定性。
英文摘要	The Tianshuihai Lake Basin（4840m a. s. 1. ）is located in the northwestern edge of the Qinghai-Tibet Plateau and the eastern flank of the Karakoram Mountains,a rain shadow region, thus is in an extremely arid area at present. Many geological evidences show however that larger lake and high lake levels once existed in this area during the Late Pleistocene. A 56. 32m core,TS95 ,was drilled from the Tianshuihai Lake Basin to study the history of the climate and environment change. This paper deals with the period of MIS 3 （59- 25kaB. P. ）according to the multi-proxies analyses of carbonate content,grain size ,delta^13C ,delta^18O and others of the TS95 core （ depth of 13.61 - 2.76m）. The resuhs demonstrate that the sedimentary phases had been changed frequently during the period of MIS 3 which suggests the lake level variations and the environment instability. The phase could be divided into four substages, i.e. 59- 45kaB. P. in a warm-dry climatic condition, 45- 41kaB. P. in a cold-humid climatic condition,41 -28kaB. P. （particularly 35.5 -34.0kaB. P. ）in a warm-humid condition, and 28 - 25kaB. P. in a cold-humid condition. There are some sub-fluctuations during every sub-stage. According to the carbonate content and grain size records, some high lake levels were found, i.e. during 59- 56kaB. P.,49- 47kaB. P.,45- 41kaB. P.,35.5- 34.0kaB. P., and 28- 25kaB. P. Based on the multi-proxies analyses of the TS95 Core we connect these high lake level events with the following three reasons：（ 1 ） The increasing ice melting water supply due to climate warming,which caused high lake level events including the 59 -56kaB. P. one. （2）The cold-humid climate which reduced evaporation but increased precipitation,causing events such as the 49 -47kaB. P. and the 45 -41kaB. P. and 28 -25kaB. P. ones. （3）The warm-humid climate caused by strong monsoonal precipitation, which caused events such as the 35.5 - 34. 0kaB. P. one. Moreover, evidences of the Heinrich events and D-O cycles were also found in the Tianshuihai lacustrine sediment record,which could be compared with the records of the stalagmites in Qixing Cave of Guizhou and the Greenland ice core. This demonstrates that the temperature changes could be global events but the precipitation situation varies in different areas.
中文关键词	湖泊沉 ; 积环境变化 ; 甜水海盆地 ; 青藏高原
英文关键词	MIS 3 MIS 3 lacustrine deposit record environment changes Tianshuihai Basin Qinghai-Tibet Plateau
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:3256550
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222180
作者单位	1.中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京, 江苏 210008, 中国; 2.中国科学院广州地球化学研究所, 广州, 广东 510640, 中国
推荐引用方式 GB/T 7714	李世杰,张宏亮,施雅风,等. 青藏高原甜水海盆地MIS3阶段湖泊沉积与环境变化[J],2008,28(1):122-131.
APA	李世杰,张宏亮,施雅风,&朱照宇.(2008).青藏高原甜水海盆地MIS3阶段湖泊沉积与环境变化.,28(1),122-131.
MLA	李世杰,et al."青藏高原甜水海盆地MIS3阶段湖泊沉积与环境变化".28.1(2008):122-131.