Subei Lixiahe Area At The End Of The Last Glacial Period Climate And Environment Evolution Research

The LiXiaHe plain located at the costal of east China, with a thick layer of Quaternary deposits, which is also located in the Asian Monsoon changes. So it is very perfect to study the paleoclimate and paleoenvironment. This paper selects the position of YanJiaGouBang as the object of study. Based on the precise chronology through the AMS14C dating techniques. We have constructed the palaeoenvironmental change processes between the past49ka BP and15ka BP of LiXiaHe by multi-proxy analysis, such as granularity, magnetic susceptibility, geochemical elements and chroma, etc. The following is brief conclusion of the study.Climate change of Lixiahe plain can be divided into those stages:stage of late MIS-3which climate is turning cold and dry to warm and humid then to cool, and stage of MIS-2which character is cold and humid then beginning to warm.YanJiaGouBang section revealed49-15cal.ka B.P. climate change not only has a better comparability with the cave stalagmites of huludong record and ocean drop record, but also has a good coincidence with the magnetic record of LingTai loess which located at the northwest of China; This indicates that the change of the climate in LiXiaHe plain not only have significant regional characteristics, but also consistent with global climate change characteristics.Spectral analysis of the record of granularity show that significant multi centennial and millennial periodicities are1667and819years. And the result indicated that climate change in LiXiaHe plain is probably mainly driven by solar change.