CAJ | 학술논문

选择位于西风区的吉力湖为研究对象,利用~(210)Pb、~(137)Cs和AMS~(14)C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一致性.
선택위우서풍구적길력호위연구대상,이용~(210)Pb、~(137)Cs화AMS~(14)C측년수단,건립료길력호침적암심2.5ka이래적시간서렬.대호박침적물적립도、총유궤탄、총담이급유궤탄동위소등다배경지표적종합분석,중건료길력호2.5ka이래적기후배경연화특정.2.5ka이래길력호기후배경변화대치경력료5개계단:500BC-50BC,난간;50BC-650AD,랭습,기후불은정,랭난파동교대;650-1350AD,난간,대응우중세기난기(MWP),1350-1850AD,랭간,대응우소빙기(LIA);1850AD이래,온간,기중20세기20년대후,우기시70년대이래,기후변난.길력호다배경지표기록적기후배경변화여기타지질기록이급역사문헌기록균구유교호적일치성.
An 80-cm-long sedimentary core from Lake Jili,which lies in westerly area of China,provided detailed information about paleoclimatic and paleoenvironmental changes in the past 2500 years.The temporal sequence of sedimentary core was constructed using the ~(210)Pb,~(137)Cs and AMS ~(14)C dating methods on the bulk organic matter.Based on analyses of grain-size,total organic carbon,total nitrogen and organic carbon isotope,climatic and environmental evolution history in the past 2500 years was reconstructed.The sequence of climatic changes in the region since 2.Ska BP was established.The climatic changes experienced five stages:warm-wet climate during 500BC-50BC;cold-wet climate during 50BC-650AD;warm-dry climate during 650-1350AD warm period(MWP);cold-dry climate period during 1350-1850AD(LIA),and moderate-dry since 1850AD,including climate wanning after 1920s,especially since 1970s.The records of climatic and environmental evolution of Lake Jili were in good according with the historical literature records and other geologic records of adjacent areas'.