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引用本文:蒋庆丰,沈吉,刘兴起,季峻峰.2.5ka来新疆吉力湖湖泊沉积记录的气候环境变化.湖泊科学,2010,22(1):119-126. DOI:10.18307/2010.0117
JIANG Qingfeng,SHEN Ji,LIU Xingqi,JI Junfeng.Environmental changes recorded by lake sediments from Lake Jili,Xinjiang during the past 2500 years. J. Lake Sci.2010,22(1):119-126. DOI:10.18307/2010.0117
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2.5ka来新疆吉力湖湖泊沉积记录的气候环境变化
蒋庆丰1,2,3, 沈吉2, 刘兴起2, 季峻峰3
1.南通大学地理科学学院, 南通 226007;2.中国科学院南京地理与湖泊研究所, 南京 210008;3.南京大学地球科学与工程学院, 南京 210093
摘要:
选择位于西风区的吉力湖为研究对象,利用210Pb、137Cs和AMS14C测年手段,建立了吉力湖沉积岩芯2.5ka以来的时间序列。对湖泊沉积物的粒度、总有机碳、总氮以及有机碳同位素等多环境指标的综合分析,重建了吉力湖2.5ka以来的气候环境演化特征。2.5ka以来吉力湖气候环境变化大致经历了5个阶段:500BC-50BC,暖干;50BC-650AD,冷湿,气候不稳定,冷暖波动较大;650-1350AD,暖干,对应于中世纪暖期(MWP),1350-1850AD,冷干,对应于小冰期(LIA);1850AD以来,温干,其中20世纪20年代后,尤其是70年代以来,气候变暖。吉力湖多环境指标记录的气候环境变化与其它地质记录以及历史文献记录均具有较好的-致性。
关键词:  吉力湖  过去2ka  多指标分析  气候环境变化
DOI:10.18307/2010.0117
分类号:
基金项目:国家自然科学基金项目(40802084);江苏省高校自然科学基金项目(08KJD170006);中国科学院南京地理与湖泊研究所所长基金项目联合资助
Environmental changes recorded by lake sediments from Lake Jili,Xinjiang during the past 2500 years
JIANG Qingfeng1,2,3, SHEN Ji2, LIU Xingqi2, JI Junfeng3
1.Geographical Science School,Nantong University,Nantong 226007,P.R.China;2.Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;3.School of Earth Science and Engineering,Nanjing University,Nanjing 210093,P.R.China
Abstract:
An 80-cm-long sedimentary core from Lake Jili, which lies in westerly area of China, provided detailed informationabout paleoclimatic and paleoenvironmental changes in the past 2500 years. The temporal sequence of sedimentary core was con-structed using the 210Pb,137Cs and AMS 14C dating methods on the bulk organic matter. Based on analyses of grain-size, total or-ganic carbon, total nitrogen and organic carbon isotope, climatic and environmental evolution history in the past 2500 years was re-constructed. The sequence of climatic changes in the region since 2. 5ka BP was established. The climatic changes experienced fivestages; warm-wet climate during 500BC-50BC; cold-wet climate during $OBC-650AD; warm-dry climate during 650-1350ADwarm period(MWP);cold-dry climate period during 1350-1850 AD (LIA),and moderate-dry since 1850AD, including climatewarming after 1920x, especially since 1970x. The records of climatic and environmental evolution of Lake Jili were in good accord-ing with the historical literature records and other geologic records of adjacent areas.
Key words:  Lake Jili  the past 2ka  mufti-proxy analyses  palaeoclimatic and paleoenvironmental changes
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