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使用一个开边界的北太平洋环流模式研究氚在北太平洋中的分布和输送.首先,选用全球同位素降水资料GNIP/ISOHIS,用插值的方法构造模式区域1951～1997年的氚强迫函数.之后将构造的氚强迫函数加为海表通量边界条件,从零初始的氚分布积分环流模式47年.将模拟结果与GEOSECS和WOCE的观测资料进行对比分析,结果表明:模式得到了与观测资料相符的经向梯度和次表层高值信号;模拟出了北太平洋区域氚的总通量在1963年出现了明显的峰值,氚的总储量在1975年后变化缓慢;模式模拟的氚由高纬度海表进入,经次表层输送向赤道方向转移,与分析观测资料得出的结论是一致的.但模拟结果在30°～40°N区域存在一定误差,这种误差在模拟CFCs分布时也曾出现.误差可能源于模式对这一区域物理过程描述的不足,但在氚强迫函数构造过程中存在的不确定性因素也会影响模拟结果.
The open north Pacific circulation model was used to study the distribution and transport of tritium in the North Pacific.Firstly, global isotope precipitation data (GNIP / ISOHIS) were used to construct the tritium forcing function in the model region from 1951 to 1997. Then, Tritium forcing function was added as the seafloor flux boundary condition from zero initial tritium distribution to the integrated circulation model for 47 years.The simulation results were compared with those observed by GEOSECS and WOCE.The results show that the model is consistent with the observed data Meridional gradient and subsurface high value signals. The total flux of tritium in the North Pacific region was simulated to show a significant peak in 1963, and the total amount of tritium changed slowly after 1975. The modeled tritium was derived from the high latitude sea surface It is consistent with the conclusion from the analysis of observed data that the simulation results have some errors in the region of 30 ° ~ 40 ° N, and such errors have also appeared in the simulation of the distribution of CFCs. Errors may stem from the lack of description of the physical processes in this area by the model, but uncertainties in the construction of tritium forcing functions also affect the simulation results.