6000-Year Climate Records in an Ice Core from the Høghetta Ice Dome in Northern Spitsbergen
6000-Year Climate Records in an Ice Core from the Høghetta Ice Dome in Northern Spitsbergen
复制标题
斯匹次卑尔根岛北部 Høghetta 冰穹冰芯中 6000 年的气候记录
作者：
Yoshiyuki Fujii;K. Kamiyama;Toshiyuki Kawamura;T. Kameda;K. Izumi;K. Satow;Hiroyuki Enomoto;T. Nakamura;J. O. Hagen;Y. Gjessing;O. Watanabe
In 1987 an ice core to the bedrock at a depth of 85.6 m was drilled at the top of Høghetta ice dome in northern Spitsbergen. Chronology of the ice core was examined by tritium and 14C methods showing time gap at about 50 m depth. The age of three bottom ice samples was determined as 4150–5670 year B.P. by 14C method done for frozen bacteria colonies and a frozen petal. This chronology and negative bottom temperature of −9.4°C suggest that glaciers in Spitsbergen shrank considerably during the hypsithermal. The pH of melt-water samples lower than 5.0 corresponds well to large northern hemispheric volcanic eruptions during the last 300 years. Increase of acidity from 30 m depth to the surface may reflect the spread of air pollution to the Arctic during the past 200 years. On the basis of ice-core analyses on electrical conductivity, pH, chemical composition and air bubble pattern, climate and environment in Spitsbergen during the last 6000 years are discussed.
