东北及邻区过去两万年来有机碳同位素记录特征  

The Characteristics of Organic Carbon Isotope Records in Northeast China and Adjacent Areas During the Past 20,000 Years

作　　者：勇心意 张瑞[1] 张硕 于梦晴 Yong Xinyi;Zhang Rui;Zhang Shuo;Yu Mengqing(School of Geography Sciences,Liaoning Normal University,Dalian,China)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连

出　　处：《科学技术创新》2024年第1期38-42,共5页Scientific and Technological Innovation

摘　　要：末次冰盛期(LGM)距今大约21ka,两万年来气候演化是过去气候变化研究的重要内容,也是预测未来气候变化的关键。基于湖泊、泥炭长链正构烷烃单体碳同位素(δ^(13)C)和土壤有机质碳同位素(δ^(13)CSOM)记录,重建了LGM以来东北及邻区区碳同位素时间演化序列。结果表明,从LGM至早全新世δ^(13)C值增加至最大值(-23‰),中全新世下降后趋于稳定。对比古气候记录,揭示LGM以来有效湿度可能是东北及邻区δ^(13)C值变化的主导因素。The Last Glacial Maximum(LGM)occurred approximately 21,000 years ago,and the climatic evolution over the past 20,000 years constitutes a crucial aspect in the study of historical climate fluctuations as well as a pivotal factor in forecasting future climate variations.Based on the long chain normal paraffin monomer carbon isotope(δ^(13)C)recorded in lakes,peat and soil organic matter carbon isotope(δ^(13)CSOM),the temporal evolution sequence of carbon isotope since LGM in northeast China and neighboring areas was reconstructed.The results suggest that theδ^(13)C value exhibited a peak(-23‰)during the transition from the Last Glacial Maximum(LGM)to the early Holocene,followed by a subsequent decline and stabilization after the Middle Holocene.Through comparison with paleoclimate records,it is evident that effective humidity plays a dominant role in influencing variations inδ^(13)C values in Northeast China and neighboring regions since LGM.

关 键 词：末次冰盛期 中国东北及邻区 碳同位素 有效湿度 

分 类 号：P597[天文地球—地球化学]