Comparative Study Of The Last Interglacial Climate Indicators, Luochuan Area

Luochuan loess plateau is called the standard place as one of three mainstays of researching the global climate environment change,It preserves a model of loess landscape,Its section is clear and the stratum is entire,It recorded important geological events and information of paleoclimate,paleoenvironment and palaeontology since Quaternary truly,It is the ideal place of studying the Quaternary geological events in Chinese continent,even Eurasia continent.We choose the paleosol of S1 stratum being located in the Heimugou section in Luochuan area as an object of study,We rebuild paleovegetation and paleoenvironment by sporopollen,We can verify the accuracy of sporopollen to recover paleoclimation through contrasted with grain size,magnetic susceptibility and Rb/Sr value,Moreover,we can verify if the climate change characteristic of luochan area is according with the whole world by contrasting it with the Loess plateau,Qinghai-Tibet Plateau,Chinese Nanhai Sea and polar region area,On the other hand,we can know the current climate change pattern and guide the future climate change condition by contrasting the last interglacial with the Holocene climate of luochuan area.After researching,we have reached the following conclusions:1,The southeast monsoon had in vogue comparatively in the last interglacial of luochuan area and it had three times violent stages,respectively at 128-123.2kaB.P,96.7-89kaB.P and 81.3-75kaB.P,The monsoon was the best powerful in the stage at 128-123.2kaB.P which environment was warm and moist sylvosteppe and had abundant of deciduous-broad leaved trees.2,By being contrasted we can see that the sporopollen data is the most sensitive to respond climate,The grain size shows more sensitive than magnetic susceptibility and there are about 12-16ka difference between them,The Rb/Sr value was later about 2-7ka than the total iron content on responsing climate.3,We can see from our sporopollen data,luochuan area had appeared indeed forest in the last interglacial,but is not to have the forest that said by some people.4,We can see that climate changes of luochuan area in the last interglacial was consistent with other place by contrasting with other area of the Loess plateau,Qinghai-Tibet Plateau, Chinese Nanhai Sea and polar region area,Summer monsoons had 3 times strengthen stages in 5 times changes and they could contrast with 5 sub stages of MIS5.5,By contrasting the climate change of luochuan in the last interglacial with that of Holocene,we conclude that the trend turning warm of climate will be continue.