一个太平洋海盆尺度环流模式及其模拟结果  

A Basinwide Ocean General Circulation Model of the Pacific Ocean and Its Simulation Results

作　　者：徐永福[1] 李阳春[1] 赵亮[2] 李荣凤[3] 俞永强[3] 

机构地区：[1]中国科学院大气物理研究所大气边界层和大气化学国家重点实验室,北京100029 [2]中国海洋大学物理海洋研究所,青岛266003 [3]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029

出　　处：《大气科学》2006年第5期927-938,共12页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院知识创新工程重大项目KZCX1SW011;国家自然科学基金资助项目40231004;40221503

摘　　要：在中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG)发展的全球气候海洋环流模式(LICOM)的基础上构建了一个太平洋海盆环流模式,并对其模拟结果进行了深入的分析。在模拟中对中尺度示踪物输送采用了两种方案,即传统的水平扩散方案(HOR)和包括涡旋诱导速度的等密度面扩散方案(GM)。对这两个试验的气候平衡态结果分析发现,该模式较好地模拟出了太平洋的环流特征,包括副热带大涡、副极地涡旋以及南极绕流(ACC)等。赤道附近的各种流系亦得到了较好的模拟,模拟的150°W赤道潜流的最大流速为40 cm/s,出现在次表层130 m左右,虽然模拟值比基于NCEP资料估计的最大流速80 cm/s小,但与其位置十分相近。两个试验均较好地模拟出了温盐的分布结构,包括北太平洋和南太平洋中层水的形成以及南极底层水的输送等。通过详细分析两个试验结果发现,总的说来在目前模式所采用的参数条件下,GM的结果稍好于HOR的结果。这些模拟结果表明,在LICOM基础上构建的太平洋环流模式从总体上是能再现许多观测特征的,可为今后进一步研究被动示踪物在北太平洋的分布等问题提供一个十分有用的工具。A basinwide ocean general circulation model of the Pacific Ocean is configured from a global ocean general circulation model called LICOM that was developed by the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics of the Institute of Atmospheric Physics, Chinese Academy of Sciences, from which the modeled results are analyzed. Two numerical experiments are conducted that are identical in every manner except their representation of mesoscale transports of tracers. The cases include a run with traditional horizontal diffusion （Laplace） （HOR） and a run （GM） in which isopycnal diffusion and eddy induced transport velocities are included following Gent and McWilliams （1990）. From the equilibrium results of the two cases, it is found that our model well reproduces the circulation characteristics of the Pacific Ocean, including subtropical gyre, subpolar gyre, Antarctic Circumpolar Current （ACC）, etc. The maximum value of 180 Sv for ACC is larger than data based estimate and LICOM estimate. The maximum and minimum values of the simulated annual mean northward heat transport are 0. 8 PW and 0. 8 PW, which appear at 15°N and 15°S, respectively. These results are in good agreement with those from some data based estimates. There is no significant difference for heat transport between HOR and GM. The current system in the equatorial region is well simulated, which is quite associated with horizontal resolution. The maximum of 40 cm/s for the simulated equatorial undercurrent appears at the subsurface of 130 m. The position is quite consistent with that from NCEP data, but the value is much smaller than that of 80 cm/s obtained by NCEP, and larger than that obtained by a model with 2°resolution. Although the patterns from GM and HOR are quite similar, the values from GM are generally larger than those from HOP,. The model well reproduces the strong upwelling velocities in the eastern equatorial region with the largest value of about 3 ×10^-5 m/s. The ar

关 键 词：海洋环流模式 太平洋 中尺度示踪物输送 温盐环流 水团 

分 类 号：P732[天文地球—海洋科学]