Oxygen 18 and helium as tracers of ice shelf water and water/ice interaction in the Weddell Sea
Oxygen 18 and helium as tracers of ice shelf water and water/ice interaction in the Weddell Sea
复制标题
氧 18 和氦作为威德尔海冰架水和水/冰相互作用的示踪剂
DOI：
10.1029/jc095ic03p03253
复制
发表时间：
1990
影响因子：
--
通讯作者：
K. Münnich
中科院分区：
文献类型：
--
作者：
P. Schlosser;R. Bayer;A. Foldvik;T. Gammelsrød;G. Rohardt;K. Münnich
氧18和氦同位素数据位于菲尔希纳凹陷，在威德尔海南部的大陆坡，并在威德尔海中部的台站介绍和讨论。由于冰架底部的冰川冰融化，在菲尔希纳/伦讷冰架（冰架水，或ISW）下循环的水中留下的18 O和4 He信号被追踪到横跨分隔菲尔希纳凹陷和威德尔海的岩床。低的δ 18 O值与高的4 He浓度相关（最小δ 18 O值：-0.8 ‰;最大4 He浓度：约4.7×10−8 cm 3 STP g−1）。据估计，在费尔希纳凹陷发现的ISW中所含的冰川融水比例约为6 ‰至7‰。18 O和氦同位素数据从大陆斜坡上观察到的溢出陆架水组件证实了假设，ISW贡献显着威德尔海底水（WSBW）。在多参数水团分析的基础上，讨论了WSBW的哪一部分来自ISW，以及其他陆架沃茨可能对WSBW有贡献。
Oxygen 18 and helium isotope data from stations located in the Filchner Depression, on the continental slope of the southern Weddell Sea, and in the central Weddell Sea are presented and discussed. The 18O and 4He signals imprinted on the water circulating under the Filchner/Ronne Ice Shelf (Ice Shelf Water, or ISW) due to melting of glacial ice at the base of the ice shelf are traced across the sill separating the Filchner Depression from the Weddell Sea. Low δ18O values are correlated with high 4He concentrations in the ISW found in the Filchner Depression (minimum δ18O values: −0.8‰; maximum 4He concentrations: about 4.7×10−8 cm3 STP g−1). The fraction of glacial meltwater contained in the ISW found in the Filchner Depression is estimated to about 6 to 7‰. The 18O and helium isotope data from the overflowing shelf water component observed on the continental slope confirm the hypothesis that ISW contributes significantly to the Weddell Sea Bottom Water (WSBW). On the basis of a inultiparameter water mass analysis it is discussed which fraction of the WSBW originates from ISW and which other shelf waters potentially could contribute to WSBW.