| 摘要: |
| 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亚带冷期出现在约15-14KaB.P.，是冰消或早期的一次降温事件，可与最老仙女木期对比；A3亚带冷期出现在12-11Ka.B.P.，可与新仙女木期对比．B2亚带冷期反映早全新世的一次降温事件．A2亚带相对暖期可能属布林升温波动，发生在14-13ka.B.P.。C带气候暖湿，为气候最适宜期，当属冰后期中的高温阶段，在中国东部沿海普遍存在，发生在中全新世8-3Ka.B.P.。 |
| 关键词: 南黄海 第四纪 古气候事件 环境演变 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49676293号 |
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| PALEOCLIMATE EVENTS AND ENVIRONMENT EVOLUTION OF THE SHELF AREA IN THE SOUTH YELLOW SEA DURING THE PAST 15ka |
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MENG Guang-lan,HAN You-song,WANG Shao-qing
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Insititule of Oceanology, The Chinese Academy of deiences, Qingdao, 266071
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| Abstract: |
| 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. |
| Key words: South Yellow Sea, Quaternary, Paleoclimate events, Environment evolution |
