The Paleoclimate Evolution In Jingyuan Loess Records In Last Glacial Interglacial Cycle

The Chinese loess is continual by its deposition, the resolution high contains the rich environmental information and the abysmal deposit, the polar ice core for the global change three big props.Loess-paleo soils sequence is the palaeo-climatology time Asia winter monsoon and the summer monsoon environment effect direct-reflection.Jingyuan loess deposition thickness, Information of paleoclimate evolution was high resolution. Through the section grain size , susceptibility, CaCO3%, TOC, chroma comprehensive analysis shows that the index of 1gm.the spinning back part of the ancient climate evolution, a complete record with PACEMAP and GRIP contrast is in good agreement with the global change, and is consistent.In interglacial profile of the climate change curve and oxygen isotopes curve based on the contrast, can be divided into five stages, namely, the traditional "three peak two valley" - three summer monsoon period and enhance both winter monsoon period. Enhance At the same time, through comprehensive comparison of various indexes were found during the period of five subprime climate fluctuation. The climate there that unstable factors.The last glacial stage, the success of loess records to capture, including 6 H ,YD events and 20 D - O cycles. And in the time of GRIP and record can very well. In the region that comparison glacial has experienced a series of rapid climate fluctuation.