青海湖近千年来气候环境变化的湖泊沉积记录  

RECORDS FROM LAKE SEDIMENTS OF THE QINGHAI LAKE TO MIRROR CLIMATIC AND ENVIRONMENTAL CHANGES OF THE PAST ABOUT 1 000 YEARS

作　　者：沈吉[1] 张恩楼[1] 夏威岚[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室,南京210008

出　　处：《第四纪研究》2001年第6期508-513,共6页Quaternary Sciences

基　　金：国家自然科学基金 (批准号 :4 0 0 72 0 5 6 );国家重点基础研究发展规划项目 (批准号 :G1 9980 4 0 81 0 )资助

摘　　要：本文根据青海湖沉积岩芯 (QH0 0A)碳酸盐含量、TOC和Rb Sr等环境指标的综合分析 ,探讨了该地区近千年来的气候变化过程和化学风化史。结果表明 :青海湖地区近千年来经历了 5次冷湿期和 5次暖干期 ,气候组合类型为冷湿与暖干交替。中世纪暖期、小冰期以及 2 0世纪以来的升温在该沉积岩芯中得到良好的记录。沉积岩芯Rb Sr较好地记录了湖泊流域化学风化的历史 ,并揭示流域化学风化的主要控制因素为气温变化。The data of TOC, Rb/Sr and carbonate content in the Qinghai Lake sediment core (QH00A) show in the past about 1 000 years this area experienced five cold-wet periods and five warm-dry periods. During the cold periods of 1 050～1 160 A.D., 1 290～1 330 A.D., 1 470～1 570 A.D., 1 620～1 680 A.D. and 1 770～1 870 A.D., the lake enlarged several times because of low salinity. The higher Rb/Sr reflects that chemical weathering was weaker. Such climatic events as 'Medieval Warm Period', 'Little Glacial' and '20 Century Warming' were well recorded in the sediment core. These results are comparable with those based on tree ring, ice core and historical records.$$$$

关 键 词：气候变化 湖泊沉积记录 青海湖 暖期 小冰期 化学风化 

分 类 号：P532[天文地球—古生物学与地层学]