末次冰消期热带湖光岩玛珥湖古季风变化记录

末次冰消期热带湖光岩玛珥湖沉积物高分辨率的生物硅、总有机碳、总氮和总氢等有机地化指标记录显示了一系列百年至千年尺度的快速变化 ,表明季风环流系统运行的强烈不稳定性。这种不稳定变化与格陵兰冰芯记录的气候事件相比较 ,表现出一定的遥相关 ,但也表现出了末次冰消期初始转暖低纬度区超前高纬度区的显著不同 ,这种变化可能与低纬度区热带水文循环的驱动作用相关

CHANGES IN TROPICAL ASIA MONSOON DURING THE LAST DEGLACIATION

Maar lake Huguangyan is located in Leizhou Peninsula in the South China Sea, where is intersect site of eastern southeast monsoon and southwest monsoon and sensitive to climate change. The concentrations of biogenic silica, total organic carbon, total nitrogen and total hydrogen inferred from the sediments of maar lake Huguangyan provide a climate record with century resolution between 18000 and 10000 years before the present(B.P.). The records in detail show many of the rapid climate shifts related to the ice cores record in central Greenland during the last deglaciation, and the Bolling warming at the end of the last glacial leads that of Greenland, wheres the cooling of the Younger Dryas occurred synchronously in the two regions. The observations fully demonstrate the existence of the twostep shape of the last deglaciation in tropic Asia but also point to a noticeable difference between the low and high latitude in the northern hemisphere. Thus, the first warming at the last deglaciation in the low latitude may have preceded that of the high latitude,and this result likely suggest that the primarily forcing of north hemisphere climate changes during this period derived from the tropical low latitude, but atmospheric water vapor maybe played a important role.