辽东半岛全新世沉积物记录的古气候变化研究进展

Research Progress on Paleoclimate Change from Holocene Sediment Records in Liaodong Peninsula

全新世气候变化与人类发展关系密切,古气候重建工作对现代气候环境的研究与保护具有很大的借鉴意义,是当今全球变化研究的重点热点之一。从辽东半岛全新世沉积物入手,详细汇总了其分布、类型与岩性情况,并收集主要孢粉及贝壳堤信息对全新世气候及海平面重建成果进行总结与分析。结果表明:1)本区全新世沉积物分布较为分散、层序多样且存在缺失,剖面/钻孔大多集中于辽南地区的金州区、普兰店市、瓦房店市、庄河市及丹东东港市,且多集中于黄海海岸;2)沉积物类型主要为潟湖/湖沼沉积物、海积物、坡积/洪冲积物3种;3)该区全新世气候演变过程为干冷—湿热—干冷的模式,其中8.0~3.0 ka B.P.是气候最适宜期,沉积记录显示在5.6 ka B.P.前后,出现一次降温(变干)事件;4)该区最大的海侵发生在6.5~5.0 ka B.P.,在9.3~8.0 cal.ka B.P.经历了一次海退事件。后期需在技术应用、学科交叉等方面加强研究。

Research on climate change in the Holocene has been fruitful in recent years.However,research in the Liaodong Peninsula has rarely been reported.The studies were mostly concentrated in the 1980s to 1990s,and few reports have appeared since.In order to better carry out research on Holocene climate change in this area,important research results are summarized here.This study begins with Holocene sediments(including peat)reported for the Liaodong Peninsula,and summarizes their distribution,types and lithology,and collects the research results of Holocene climate and sea-level reconstruction based on the properties of pollen and shell deposits.Finally it summarizes the deficiencies of previous work and proposes future research directions.The results show that the distribution of Holocene sediments in this area is relatively scattered,the sequence is diverse,and there are deficiencies.Most of the studied sections/cores were concentrated in Jinzhou District,Pulandian city,Wafangdian city and Zhuanghe city in southern Liaoning and Donggang city in Dandong,concentrated along the Yellow Sea coast.Sediment types are mainly lagoon/lake sediments,marine sediments,and sloping flood sediments.In terms of climate change,the Holocene climate in this area evolved from dry and cold to humid and warm to dry and cold.The Holocene Optimal Period in this area was 8.0-3.0 ka B.P.including a cooling(drying)event occurred at 5.6 ka B.P..The maximum transgression occurred in 6.5-5.0 ka B.P.and experienced a regressive event during 9.3-8.0 ka.cal B.P..In future it will be necessary to strengthen technical application and interdisciplinary research.