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自由表面海洋环流模式的正、斜压模分解算法 总被引：1，自引：0，他引：1
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。 相似文献
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The structure of the monsoon depression and the observed flow features prior to and at the time of monsoon depression formation
(composite of 15 depressions) are examined. The composite monsoon depression (transient eddy) has a scale of 25° longitude
and extends up to 300 mb and has the greatest intensity at 700 mb. It shows north-north-east to south-south-west tilt in the
lower levels indicating that it may draw upon zonal kinetic energy for its growth. The disturbance has lower temperatures
to its west and tilts westwards with height indicating that eddy available potential energy is not converted from zonal available
potential energy by large scale advection. There appears to be a reduction of vertical shear at the time of formation of monsoon
depressions and this possibly aids cumulus convection.
The profiles of potential vorticity indicate extremes (i) in the upper troposphere and (ii) at several midtropospheric levels
in the region of the monsoon trough indicating the possibility of combined barotropic-baroclinic instability. Using multi-level
quasi-geostrophic model and employing the eigen-value technique it is shown that the monsoon zonal current is notbaroclinically unstable. A barotropic stability analysis is also done for monsoon zonal current in the lower and middle tropospheres. It
yields very slowly growing unstable modes at lower tropospheric levels with wave lengths of 2500 km and 5000 km. 相似文献
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雅浦-马里亚纳海沟连接区东深水通道是太平洋深层经向翻转环流携带南极绕极水进入西太平洋的首要入口。基于高分辨率的再分析数值模型结果,研究发现该通道深层流速和温度具有显著的40～90d周期的季节内变异,且季节内变异强度随深度的增加而增加,进一步研究揭示地形罗斯贝波(topographicRossbywaves,TRW)是引起上述季节内变异的主要原因,TRW波解可以解释深层流和温度季节内振幅的垂向变化。通过建立全水体的动力关联研究发现TRW在不同时刻具有不同的能量来源,首先次表层强涡旋经过时可以通过位涡守恒激发深层的TRW;第二,大洋中层存在的强涡旋也可激发深层的TRW;第三,深层平均流可以主要通过正压不稳定过程向季节内TRW提供能量。 相似文献
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