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利用中国第21次南极科学考察获得的普里兹湾海域的沉积物样品,运用沉积地层同位素210Pb测年技术,探讨了该海域沉积物的近现代沉积速率及其影响因素。研究结果表明,南极普里兹湾海域的近现代沉积速率变化范围在0.47～1.88 mm/a之间,平均值为1.06 mm/a,高于南极罗斯海而低于威德尔海,总体上与南、北极多个海区的沉积速率相当。在湾内和冰架边缘区,沉积速率主要受上层海洋生物生产的影响,而在湾口浅滩区沉积速率则主要受底栖生物的影响。此外,水流、水体稳定度、冰封期长短和海底地形等条件也对沉积速率产生一定的影响,沉积速率的分布是多种因素共同控制的结果。在生物量较高、水体条件较为稳定的湾内中心区域,沉积速率较高,而冰架边缘区的沉积速率则较低。
Sediment samples from the Prydz Bay waters obtained from the 21st Antarctic Scientific Expedition of China were used to investigate the deposition rate and its influencing factors of the sediments in this area by using 210Pb dating technique. The results show that the sedimentation rate of Prydz Bay in South Pole ranges from 0.47 to 1.88 mm / a with an average of 1.06 mm / a, which is higher than that of the Antarctic and lower than Weddell Sea. Generally speaking, Sedimentation rates are comparable in the South and Arctic regions. Sedimentation rates are mainly influenced by the upper marine life in the bay and the fringe of ice shelves, while the sedimentation rate in the shallow beach area of Bayou is mainly affected by benthic organisms. In addition, the flow rate, the stability of the water body, the length of the ice seal and the conditions of the seafloor topography also have an impact on the sedimentation rate. The distribution of sedimentation rate is the result of a combination of factors. In the central area of Baywan, where the biomass is relatively high and the water conditions are stable, the sedimentation rate is high while the sedimentation rate in the fringe of ice shelves is relatively low.