摘要
对云南洱海湖泊岩心沉积物进行了多环境指标的分析 ,建立了近 2 0 0 0 a来云南洱海流域气候与环境变化的序列 :气候演化具有暖干、冷湿交替的组合特点 ,不同于东亚季风区黄土沉积记录的冷干 -暖湿气候组合特征。一些特征气候阶段如中世纪温暖期、小冰期气候特征在洱海湖泊沉积记录中均有反映。洱海湖泊沉积记录的暖干 -冷湿气候交替变化规律反映了西南季风影响下的气候演化特征 ,具有一定的普遍性。
In the south of Erhai Lake(in Yunnan Province)is distributed a wide underwater central platform at the water depth of about 5 m.And deep troughs(10～20 m deep)lie along its east and west sides.The central platform has had a low but stable sedimentation rate.The upper 45 cm sediments represent a sedimentary record since 2 000 a ago,which is deduced from the upper average sedimentation rate of 0 22 mm/a.Based on the results of multienvironmental proxies of lake sediments from Erhai Lake,the series of climatic variations in the catchment of Erhai Lake during the past 2000 years have been established. The climatic changes showed by warm dry and cold wet alternations in Erhai Lake are different from those characterized by warm wet and cold dry climatic assemblages recorded in the loess formed by East Asian monsoon. The characteristic periods such as the Middle Ages Warm Period and Little Ice Age are both recorded in the sediments of Erhai Lake. The climatic characteristics of warm dry and cold wet alternations of the lacustrine records in Erhai Lake are of regional features in Yunnan Plateau affected by southwest monsoon on century scale.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2001年第2期31-35,共5页
Marine Geology & Quaternary Geology
基金
国家自然科学基金!资助项目 ( 4 9672 13 2 )
中国博士后科学基金!资助项目
