南黄海陆架区15ka以来的古气候事件与环境演变

于１９８６－１９９４年间，陆续对南黄海７个柱状样品进行了孢粉分析研究，结合＾１４Ｃ测年数据，参考古地磁、热释光测年等分析资料，以其中３个主要岩芯剖面资料为代表，论述了南黄海陆架区１５ｋａ以来的古气候环境演变。结果表明，在第四纪末次冰期冰消期中，气候曾剧烈波动，并逐渐由晚冰期向冰后期过渡。这一演变特点与全球气候背景下的中国东部地理环境相关。同时识别出３个短期降温和两个升温事件：其中Ａ１亚带冷期出现在

PALEOCLIMATE EVENTS AND ENVIRONMENT EVOLUTION OF THE SHELF AREA IN THE SOUTH YELLOW SEA DURING THE PAST 15ka

From 1986 to 1994, we accomplished a sporo-pollen analysis of seven prismatic samples from the southern Yellow Sea. In combination with the data of three main core sections and combined ¹⁴C dating data, paleomagnetic dating data and thermoluminescence data, this paper discusses the paleoclimate environment evolution of the southern Yellow Sea during the past 15 ka. The results show that the climate had ?uctuated dramatically and transformed from the late glaciation to the postglaciation during deglaciation in the last glacial period of the Quaternary. The evolution features are related to the geological environments of eastern China in the global climate background. Meanwhile, we have distinguished three short-term temperature dropping events and two temperature rising events. Among them, the sporo-pollen assemblage of subzone A₁ shows some features of cold climate and reflects a temperature falling event occurring about 15-14ka B.P. in the early deglaciation, which may belong to the Oldest Dryas. Subzone A₃ shows that the drought-en-during herbal plant flourished and there were few cold-resistant Picea and Abies etc., which reflects a temperature falling event occurring about 12-11ka B. P. in the late deglaciation with cold and arid climate and could compare with the Younger Dryas period. The sporo-pollen assemblage characteristic of Zone B represents the postglaciation and the climate became warm and arid. Although the plant cover of subzone B₂ shows a cold and arid climate environment, the development of flora was better than in subzone A₃. It may reflect a temperature falling event occurring about 9 ka B.P. during the early Holocene. Subzone A₂ shows some distinct differences from subzone A₁ and A₃ and reflects a rise of temperature occurring 14-13 ka. B.P. which may relate to the Bolling temperature-rising fluctuation. Zone C reflects warn-moist flora and climate, indicating a climatic optimum belonging to a high temperature stage in postglaciation. This temperature rising event occurred universally along the coast of eastern China 8-3 ka. B.P. in the middle Holocene and its duration was longer than any of the climate events mentioned above.