| 自由表面海洋环流模式的正、斜压模分解算法 |
| |
| 引用本文： | 张荣华.自由表面海洋环流模式的正、斜压模分解算法[J].大气科学,1994,18(3):310-319. |
| |
| 作者姓名： | 张荣华 |
| |
| 作者单位： | 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 100080 |
| |
| 基金项目： | 国家基础性研究重大关键项目“气候动力学和气候预测理论的研究”及国家自然科学基金资助项目 |
| |
| 摘 要： | 大气物理研究所海洋环流模式（IAP OGCM）特点之一是消除“刚盖”近似，引入海面起伏作为模式的预报变量。为此，需设计有效的时间积分方案，以克服模式中所保留的表面重力波对时间步长的苛刻限制。本文给出了适应过程中流场正压和斜压模分解算法。研究表明，把海洋模式适应过程进一步分解为与海面起伏相联系的正压模和与密度不均匀分布相联系的斜压模，用不同的时间步长数值求解，计算效率可提高数倍以上。文中用四层IAP OGCM在北太平洋区域定量地比较了节省计算时间的有效性，并给出数值计算实例。
|
| 关 键 词： | 自由表面OGCM 正、斜压模分解算法 数值检验 |
A Barotropic-Baroclinic Mode-Splitting Algorithm in the Free Surface Oceanic General Circulation Model |
| |
| Zhang Ronghua.A Barotropic-Baroclinic Mode-Splitting Algorithm in the Free Surface Oceanic General Circulation Model[J].Chinese Journal of Atmospheric Sciences,1994,18(3):310-319. |
| |
| Authors: | Zhang Ronghua |
| |
| Abstract: | An oceanic general circulation model develoPed at the Institute of AtmoSPheric Physics (IAP oGCM) is free from the rigid-lid upper boundary condition but free surfaee is incorporated so that the model Permits the explicit treatment of sea level as a prognostic variable. In order to reduce the comput-er time, some stable and efficient time integration schemes have been developed. In this paper, a barotropic-baroclinic mode-splitting algorithm for such free surface OGCM is presented. It is shown that the computational efficiency can be increased several times by splitting the adjustment process fur-ther into the barotropic mode associated with sea surface elevation and baroclinic ones with inhomogcneous distribution of sea water density, and by numerically integrating these barotropic and baroclinic modes, respectively, with different time steps or different schemes. Experiment results are given to show its practicality and to quantitatively compare the computational efficienCy in time integration. |
| |
| Keywords: | free surface OGCM barotropic-baroclinic mode-splitting numerical experiments |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《大气科学》浏览原始摘要信息 |
| 点击此处可从《大气科学》下载免费的PDF全文 |
