安固里淖沉积物记录的气候环境变迁  

Lake Sediment Records of Climatic and Environmental Change in Angulinao Lake

作　　者：姜加明[1] 吴敬禄[1] 沈吉[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所

出　　处：《地理科学》2004年第3期346-351,共6页Scientia Geographica Sinica

基　　金：中国科学院知识创新工程重大项目(批准号:KZCX1-10-02;KZCX2-SW-118);国家自然科学基金(批准号:49803001)资助项目。

摘　　要：根据对河北坝上地区安固里淖湖泊沉积物粒度、碳酸盐与TOC含量的分析,探讨了安固里淖近400年来的气候与环境变迁。研究结果表明,安固里淖地区近400年来的气候大致经历了凉干-冷湿-暖干三个气候变化阶段:1634～1801年间的气候凉干期、1801～1889年间的冷湿期以及1889年至今的暖干期,表现为暖干与冷湿相交替的气候演替类型,近百年来干暖化趋势明显。Angulinao Lake is the biggest lake in the Bashang area, Hebei Province. It lies in the southeast edge of Inner Mongolia Plateau, belonging to arid, semi-arid climate areas. And this enables its deposits to record the climatic and environmental changes sensitively. A multi-proxy investigation of a sediment core from Angulinao Lake reflects climatic and environmental evolution of the catchment over the past 400 years. On the basis of the analysis of grain size, carbonate content and total organic(TOC)content, Three environmental stages are identified. From 1634 to 1801 A.D., detrital grains and the high carbonate contents in sediments suggests the lake became shallower as a result of the dry climate. From 1801 to 1889 A.D., evidenced by thinner grain size and lower contents of TOC and carbonate, the climate became colder and moister and the lake area expanded, which is interpreted as the last fluctuation of the Little Ice age. From 1889 A.D., sediments become coarser with the rapid increase of TOC and carbonate contents, indicating a time when the climate was getting drier and drier, warmer and warmer. In all, the envirmonmental evolution in the Angulinao area over the past 400 years is charactered by the alternating of the warm-dry and the cold-humid climate. Also, the clear warm-dry trend of the lake area can be seen over the last 100 years.

关 键 词：安固里淖 环境代用指标 气候环境变迁 

分 类 号：P512.2[天文地球—地质学] P532