不同海底地形条件下黑海环流模拟结果的精度估计

IF 0.7 Q4 OCEANOGRAPHY Physical Oceanography Pub Date : 2019-07-01 DOI:10.22449/0233-7584-2019-4-341-354
O. Dymova, N. Miklashevskaya
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引用次数: 1

摘要

意图为了确定与高空间分辨率黑海环流建模的现代任务相对应的深度阵列,估计了使用不同海底地形数据计算的重建水物理场的精度。方法和结果。在俄罗斯科学院海洋水文研究所(MHI-RAS)海洋模型的基础上,进行了两次模拟环流的数值实验。水平分辨率为1.6km,垂直预设了27个不规则z层,并使用SKIRON/Eta数据(2011)作为两种情况下的大气强迫。实验之间的差异在于不同测深法的应用。在第一次实验中,根据MHI海洋数据库中的黑海深度以5分钟的分辨率预设了海底地形;第二个是基于欧洲海洋观测和数据网(EMODnet)的深度阵列ꞌ 决议将计算的水物理场与温度和盐度测量值以及海面温度的卫星图像进行了比较。分析表明,应用更高分辨率的深度数据可以提高30–300米层黑海环流热流体动力学特征的准确性。两个实验都考虑了涡流动能和平均电流动能的积分值。比较分析的结果表明,在考虑到更高分辨率的底部地形时,在模拟系统中,洋流和涡流之间的能量再分配机制在强烈风暴影响期间发生了变化。结论。本研究的结果表明,在底部起伏更平滑的实验中,涡流和海流动能的增加都是由于正压不稳定性造成的。在更复杂的测深情况下,涡流动能的增加主要是由于与斜压不稳定性相关的过程。涡流,动能。鸣谢:作者感谢审稿人的宝贵意见。实验1和比较分析是在国家任务的框架内进行的№ 0827-2019-0003“基于观测和建模方法的人为因素影响下海洋环境条件状态和演化的海洋过程基础研究”。MHI模型和实验2的EMODnet数据改编是在俄罗斯基础研究基金会(项目编号18-05-00353A)的支持下进行的。
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Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography
Purpose. Accuracy of the reconstructed hydrophysical fields calculated using different data on bottom topography is estimated in order to determine the depth array corresponding to the modern tasks of the Black Sea circulation modeling with high spatial resolution. Methods and Results. Two numerical experiments on modeling the circulation were carried out based on the Marine Hydrophysical Institute, Russian Academy of Sciences (MHI RAS) ocean model. Horizontal resolution was 1.6 km, 27 irregular z -horizons were preset vertically and the SKIRON/Eta data (2011) were used as the atmospheric forcing for both cases. Difference between the experiments consisted in application of different bathymetry. In the first experiment, the bottom topography was preset in accordance with the Black Sea depths from the MHI Ocean Data Bank with the 5-minute resolution; in the second one – based on the European Marine Observation and Data Network (EMODnet) depth array with the 1/8ꞌ resolution. The calculated hydrophysical fields were compared with the temperature and salinity measurements, and satellite images of the sea surface temperature. The analysis showed that application of the depths data of higher resolution permitted to improve accuracy of thermohydrodynamic characteristics of the Black Sea circulation in the 30–300 m layer. The integral values of the eddy kinetic energy and the mean current kinetic energy for two experiments were also considered for both of the experiments. The results of the comparative analysis demonstrate the fact that, at the bottom topography with higher resolution taken into account, in the simulated system the mechanisms of energy redistribution between currents and eddies changed during intensive storm impacts. Conclusions. The results of the present research permit to conclude that in the experiment with a smoother bottom relief, increase of kinetic energy both of the eddies and currents was due to barotropic instability. In case of more complex bathymetry, the eddy kinetic energy increased mainly owing to the processes associated with baroclinic instability. eddy, kinetic energy. Acknowledgements: t he authors are grateful to the reviewers for their helpful comments. Experi ment 1 and comparative analyses were performed in the framework of the state task № 0827-2019-0003 “Fundamental study of oceanological processes conditioning state and evolution of marine environment under effect of anthropogenic factors based on observational and modeling methods”. The EMODnet data adaptation for the MHI-model and experiment 2 were carried out under support of the Russian Foundation for Basic Research (project No. 18-05-00353 A).
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
期刊最新文献
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