The application of radiotracers to a study of Black Sea circulation: Validation of numerical simulations against observed weapons testing and Chernobyl 137Cs data
The application of radiotracers to a study of Black Sea circulation: Validation of numerical simulations against observed weapons testing and Chernobyl 137Cs data
复制标题
放射性示踪剂在黑海环流研究中的应用：根据观察到的武器测试和切尔诺贝利 137Cs 数据验证数值模拟
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
H. Livingston
中科院分区：
文献类型：
--
作者：
J. Staneva;K. Buesseler;E. Stanev;H. Livingston
本文利用人工放射性核素~(137)Cs的分布来研究黑海的混合和通风。放射性核素垂直分布的时间序列数据与模型模拟相结合，以跟踪地表含氧水在氧气/缺氧界面下方的中等深度的渗透程度和深度。模拟数据是由三维环流模式产生的，其中包括一种新的博斯普鲁斯流入/羽流的参数化，以模拟地中海水对内部混合的影响。切尔诺贝利前的137Cs(武器试验137Cs)和切尔诺贝利的137Cs的放射性示踪模型与环流模型相耦合。将模型结果与1986-1992年间收集的野外资料进行了比较。模拟的主要结果是确定在地表水混合到次表层中的夹带的贡献。模式很好地显示了示踪剂在等径面之后向更深层渗透的趋势，并与已知的黑海环流和物理情况相一致。在现场数据中发现的放射性核素活度与盐度之间的相关性得到了模拟的支持。这些模型结果表明，只要存在对黑海环流的可靠估计，现有现场数据的时空丰度就足以重建示踪剂在空间和时间上的分布。
In this paper, we use the distribution of the artificial radionuclide, 137Cs, to investigate mixing and ventilation in the Black Sea. Timeseries data of vertical radionuclide distributions are combined with model simulations in order to follow the magnitude and depth of penetration of surface oxic water into intermediate depths, below the oxic/anoxic interface. Simulated data are produced by a three-dimensional circulation model that includes a new parameterization of the Bosphorus inflow/plume to simulate the effects of Mediterranean water on internal mixing. A radioactive tracer model for pre-Chernobyl 137Cs (weapons testing 137Cs) and Chernobyl 137Cs is coupled to the circulation model. The model results are compared to field data collected between 1986 and 1992. The main output from the simulations is the identification of the contribution of entrainment in the mixing of surface waters into subsurface layers. The trend of tracer penetration into the deeper layers following isopycnal surfaces is well demonstrated in the model and is consistent with the known circulation and physics of the Black Sea. The correlation between the activities of radionuclides and salinity, found in the field data, is supported by the simulations. These model results illustrate that the time-space abundance of the existing field data is sufficient for reconstructing the distribution of tracers in space and time, provided reliable estimates of Black Sea circulation exist.