⁹⁹Tc in seawater in the West Spitsbergen Current and adjacent areas

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• 作者：Gerland ; Sebastian ; Lind ; Bjø ; rn ; Dowdall ; Mark ; Karcher ; M. ; Kolstad ; Anne Kathrine
• 关键词：Radionuclides ; Radioecology ; Oceanography ; Modelling ; Arctic ; Svalbard ; Fram Strait ; ⁹⁹Tc
• 刊名：Journal of Environmental Radioactivity
• 出版年：2003
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：2003
• 卷：69
• 期：1-2
• 页码：119-127
• 文件大小：138 K

摘要

⁹⁹Tc levels were measured in seawater samples collected between 2000 and 2002 in the West Spitsbergen Current (WSC) and along the western coast of Svalbard or Spitzbergen and compared with available oceanographic 3-D modelling results for the late 1990s. Additional data from related regions are also presented in order to support the data interpretation. The seawater in the Arctic fjord Kongsfjorden on the western coast of Svalbard is influenced by the WSC, as shown by the ⁹⁹Tc levels in surface water. By means of the WSC, ⁹⁹Tc reaches the Eastern Fram Strait, where one branch of the WSC turns west into the East Greenland Current (EGC), and another branch continues northwards into the Arctic Ocean. Surface seawater collected in the central part of the WSC during a cruise on board the R/V “Polarstern” in the summer of 2000, showed higher levels of ⁹⁹Tc than samples measured in Kongsfjorden in the spring of 2000. However, all levels measured in surface water are of the same order of magnitude. Data from sampling of deeper water in the WSC and EGC provide information pertaining to the lateral distribution of ⁹⁹Tc. In all vertical profiling surveys (conducted in spring and summer), the highest levels of ⁹⁹Tc were found in surface water. Comparison with oceanographic 3-D modelling indicates both significant seasonal variations in the lateral stratification of the WSC and variations with depth over shorter vertical distances. This information can be applied in sampling strategies, environmental monitoring, long-range transport of pollutants and physical oceanography.