全新世大暖期云南洱海环境演化的湖泊沉积记录  

ENVIRONMENTAL EVOLUTION RECORDED BY LAKE SEDIMENTS FROM ERHAI LAKE, YUNNAN PROVINCE IN HOLOCENE MEGATHERMAL

作　　者：张振克[1] 吴瑞金[2] 王苏民[2] 沈 吉[2] 吴艳宏[2] 李升峰[1] 

机构地区：[1]南京大学大地海洋科学系,南京210093 [2]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《海洋与湖沼》2000年第2期210-214,共5页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金!49672132;中国科学院创新工程项目!KZCX1-Y-05

摘　　要：根据高分辨率湖泊沉积的有机碳稳定同位素记录、硅藻等环境指标分析结果，将洱海全新世大暖期（８．１—３．０ｋａ Ｂ．Ｐ．）的环境演化分为７个阶段，环境变化序列以温（暖）湿－暖（温）干为主，其中存在明显冷干（湿）事件，冷事件出现在７．２ｋａ Ｂ．Ｐ．、５．３ｋａ Ｂ．Ｐ．和３．７ｋａＢ．Ｐ．。全新世大暖期洱海湖面波动与气候变化具有明显的一致性。洱海湖泊沉积记录的环境演化主要受亚洲季风强弱转换和时空迁移的影响，冷事件与亚洲冬季风加强有关，暖干气候受东亚夏季风加强影响，温（暖）湿气候反映西南季风加强。Based upon the high resolution environmental proxy data including radiocarbon ages, organic carbon stable isotope ratios and diatom concentrations from Erhai Lake sediment cores, the environmental evolution in Holocene Megathermal (ca. 8.1-3.0ka B.P.) is divided into seven stages with the main sequences of temperate or warm-wet and warn (temprate)-dry. The events of cold wet (3.7ka B. P.) and cold dry (7.2ka B.P. and 5.3ka B.P.) are recorded by the sediments from Erhai Lake in Holocene Megathermal. During the period the lake level fluctuations were coincided with climate variations. The environmental evolution recorded by lake sediments was mainly affected by the strong-weak transition and tomporal-spatial changes of the monsoon in Asia. Stages of warm (temperate)-dry in Holocene Megathermal were controlled by the west-moving of subtropical high pressure in the Northwest Pacific Ocean which indicates that southeast monsoon was intensified in summer. Stages of temperate (warm)-wet show the intensification of southwest monsoon. The cold events were the results of the enhancement of winter monsoon in East Asia.

关 键 词：湖泊沉积 洱海 环境演变 古气侯 全新世 大暖期 

分 类 号：P512.3[天文地球—地质学] P534.632