机译:在TRACMASS轨迹模型v6.0中评估海洋和大气轨迹方案
stepwise stationary. The second scheme is a special case of the stepwise-stationary scheme, where velocities are assumed constant between general circulation model (GCM) outputs; it uses hence a
fixed GCM time step. The third scheme uses a continuous linear interpolation of the fields in time and solves the trajectory path from a differential equation as a function of both space and time, i.e. a
time-dependentscheme. The trajectory schemes are tested
offline, i.e. using the already integrated and stored velocity fields from a GCM. The first comparison of the schemes uses trajectories calculated using the velocity fields from a high-resolution ocean general circulation model in the Agulhas region. The second comparison uses trajectories calculated using the wind fields from an atmospheric reanalysis. The study shows that using the time-dependent scheme over the stepwise-stationary scheme greatly improves accuracy with only a small increase in computational time. It is also found that with decreasing time steps the stepwise-stationary scheme becomes increasingly more accurate but at increased computational cost. The time-dependent scheme is therefore preferred over the stepwise-stationary scheme. However, when averaging over large ensembles of trajectories, the two schemes are comparable, as intrinsic variability dominates over numerical errors. The fixed GCM time step scheme is found to be less accurate than the stepwise-stationary scheme, even when considering averages over large ensembles.
逐步静止 q>。第二种方案是逐步平稳方案的特殊情况,其中假定一般循环模型(GCM)输出之间的速度恒定;因此,它使用了固定的GCM时间步长 q>。第三种方案使用时间上的场的连续线性插值,并根据时间和空间的函数根据微分方程求解轨迹路径,即与时间有关的 q>方案。离线测试轨迹方案,即使用来自GCM的已集成和存储的速度场进行测试。方案的第一次比较使用的轨迹是根据Agulhas地区高分辨率海洋总环流模型的速度场计算得出的。第二种比较使用的轨迹是根据大气再分析得出的风场计算出来的。研究表明,在逐步平稳方案上使用时变方案大大提高了精度,而计算时间却很少增加。还发现随着时间步长的减少,逐步平稳方案变得越来越精确,但是计算量却增加了。因此,与时间相关的方案优于逐步平稳的方案。但是,当对较大的轨迹集合求平均时,这两种方案是可比较的,因为内在变异性主导着数值误差。发现即使在考虑大型合奏的平均值时,固定GCM时间步长方案也比逐步平稳方案的准确性差。
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机译:评估TRaCmass轨迹模型v6.0中的海洋和大气轨迹方案