Study On Environment Change Of Ancient Yellow Sea Since Last Deglaciation And Younger Dryas Event

Being a warming stage in orbital scale changes, the last deglaciation period doesn't keep a stable climate but characterized by some short cooling events. Younger Dryas event (YD) is an abrupt cooling event in the warming period, a nearest and intense cooling event in the geologic record. Not being controlled by Millankovitch's orbital theory, it is a hypo-orbital cooling event. Its definite mechanism of formation and transmit is still in hypothesis and discussion. More and more materials and data prove that YD is a global climate change. Because of local or regional factors, it shows discrepancy on the time, period and intension in different areas. On current warming condition, it is very important to study the global change and regional response of YD to understand future climate change and its impact on the natural environment and human future.Between Eurasia and Pacific, Yellow Sea and East China Sea, impacted by the three world famous monsoons, is one of most important regions to study global change and local response. The global climate change is always attended by sea level fluctuation. It indicates that the sea level of Yellow Sea and East China Sea oscillates between -72m and -60m fathom line. Ancient Yellow Sea is a narrow and long gulf with about 190km wide entrance and about 700km long central axis. Ancient Yellow Sea not only has good and unique response to the climate events since last deglaciation, but also is the result of global change and regional response. It is one of most developed economy area and most population in the west mainland coast of Yellow Sea. If it was cold suddenly on the warming situation, catastrophic consequence must be brought not only to the natural environment but national...