西格陵兰中晚全新世硅藻组合及其古环境演变

MIDDLE-LATE HOLOCENE PALEOENVIRONMENTAL CHANGES OF THE WEST GREENLAND INFERRED FROM A DIATOM RECORD

对西格陵兰海域GA306-GC3孔中的89个样品进行鉴定,共发现46个属的107个硅藻种及其变种,运用聚类分析方法后发现该孔可分为3个硅藻带和2个亚带。硅藻丰度变化与格陵兰冰芯重建的6 700年以来的温度变化具有明显一致性,同时也与其它古气候记录有较好的对应关系,共同追溯了西格陵兰海域6 700年来的气候变化,记录了全新世大暖期、黑暗时代冷期、中世纪暖期和小冰期等古气候事件。

Totally 89 samples and 107 diatom taxa were studied from a high-resolution gravity core （GA306-GC3） which reveals the paleoenvironmental changes off the West Greenland since 6 700 cal. a BP. Cluster analysis divides the studied period into 3 intervals and 2 subintervals. The palaeoceanographic and climatic changes revealed by the dia- tom species distribution on the West Greenland shelf coincide with the general pattern of palaeoceanographic changes in the North Atlantic region.