【摘要】 本研究对南黄海西北部山东半岛沿岸的沉积柱140年的颗石藻(Coccolithophores)样品进行了种类组成和丰度分析。结果显示,共发现颗石藻8种,平均丰度为9.76×10~6个/g,丰度范围为(5.07～14.21)×10~6个/g。其中,大洋桥石藻(Gephyrocapsa oceanica)和赫氏艾密里藻(Emiliania huxleyi)是丰度较高的主要物种,平均丰度分别为4.96×10~6、4.55×10~6个/g。通过比较沉积记录与气候参数发现,颗石藻丰度的长期变化与东亚冬季风的替代指标海平面气压(SLP)有一定相关性,黄海沿岸流受季风影响,随着东亚冬季风的增强而加强,沿岸流带来了物质输入,为研究区域的颗石藻提供了丰富的营养盐,从而支撑了较高的颗石藻丰度。更多还原

【Abstract】 Coccolithophores, as important primary producers in the marine ecosystem, respond sensitively to changes in environmental conditions. When coccolithophores die, the calcified plates(Coccoliths) that they secrete can reflect environmental changes. Hence, coccoliths are important indicators for studying paleoenvironmental and paleoclimatic changes. However, most studies on coccolithophore sediments have been conducted in the Atlantic and the Northeast Pacific Oceans; studies on the continental shelf in the Northwest Pacific are rarely reported. This study aims to address this shortage of long-term records for coccolithophores in the Yellow Sea. The results from these experiments can be compared with climatic changes to explore the corresponding relationship. The results will also provide fundamental data and a theoretical basis for related research. In this study, the coccolith fossils from one box core taken from a sampling position(Station N02) on the coast of the Shandong Peninsula, China, in the northwestern part of the South Yellow Sea, were used for the research. Species identification and abundance statistics were carried out and obtained for the coccolith fossils in the sediment, which scaled 140 years. Eight species of coccolithophore were found. The absolute abundance of coccoliths from the N02 Station core ranged from 5.07×10~6 to 14.21×10~6 coccoliths/g, with an average value of 9.76×10~6 coccoliths/g. Gephyrocapsa oceanica and Emiliania huxleyi were the two species with the highest abundance. By comparing the sediment record with the climatic data from the station, a correlation with the sea level pressure was observed. Sea level pressure can be used as an indicator for the East Asian winter monsoon. The analysis showed that when the East Asian winter monsoon was strong, the coastal currents of the Yellow Sea provided a good nutrient-salt environment for the coccolithophores at the N02 Station, resulting in a high abundance of coccoliths.更多还原