黑海大陆架及其中部亚中尺度范围海流能量的季节和垂直变化

IF 0.7 Q4 OCEANOGRAPHY
O. Puzina, A. Kubryakov, A. Mizyuk
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引用次数: 3

摘要

意图该研究旨在调查黑海深部和陆架区域次中尺度海流能量(尺度L=1…10km,T=1…10d)的季节变化和垂直分布。方法和结果。该研究基于对高空间分辨率1 km的NEMO模型数值计算结果的光谱分析。分析表明,在盆地的深部和陆架区域,次中尺度能量的季节变化显著不同。同时,在这两个区域,L<10rm(Esp)尺度的次中尺度海流能量的季节变化与同一尺度的密度波动的季节变化非常一致。在海的中部,Esp的高值全年都集中在上层混合层。在冬季0–40 m深处观测到Esp峰,这表明混合层深度(MLD)的不均匀分布引起的斜压不稳定性在亚中尺度过程的产生中起着重要作用。同时,在2月份,在西北陆架的中部,观测到(Esp)的绝对最小值。这个最小值是由水柱的完全混合和斜压作用引起的。Esp最大值出现在9月至10月的大陆架上。这与中尺度涡旋增强河口微咸水输送有关。与夏季月份相比,秋季陆架和盆地深层的Esp值较高。Esp垂直分布的可变性与MLD的时间变化一致。次中尺度能量的变化具有脉动特征,具有短期的强化和弱化。这种变化与中尺度锋面的经过以及涡旋和上升流引起的跨大陆架水输送密切相关,从而导致斜压不稳定性的增加。结论。对黑海深部和陆架区次中尺度洋流的季节和垂直变化的分析表明,主要由MLD的异质性引发的斜压不稳定性对其动力学起着决定性作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part
Purpose. The study is aimed at investigating seasonal variability and vertical distribution of the sub-mesoscale currents energy (scales L = 1 … 10 km, T = 1 … 10 days) in the deep and shelf zones of the Black Sea. Methods and Results. The study is based on the spectral analysis of the results obtained from the NEMO model numerical calculations performed with high spatial resolution 1 km. The analysis shows that the seasonal variability of the submesoscale energy is significantly different in deep and shelf zones of the basin. At the same time, in both regions, seasonal variation of energy of the sub-mesoscale currents with scales L < 10 rm (Esp) is in good agreement with that of the density fluctuations on the same scales. In the central part of the sea, the high values of Esp are concentrated in the upper mixed layer throughout the whole year. The Esp peak is observed in winter at the depths 0–40 m, which indicates the important role of baroclinic instability induced by the inhomogeneous distribution of the mixed layer depth (MLD) in the generation of sub-mesoscale processes. At the same time, in February in the central part of the northwestern shelf, an absolute minimum of (Esp) is observed. This minimum is caused by the complete mixing and barotropization of the water column. The Esp maximum values are observed in the shelf in September – October. This is related to the intensification of the brackish water transport from the river mouths by mesoscale eddies. In the autumn period high values of Esp in the shelf and deep part of the basin are observed in the deeper layer, compare to summer months .Variability of the Esp vertical distribution coincides to the time variation of MLD. Variability of the submesoscale energy is of a pulsating character with the short-term intensifications and weakenings. Such variability is significantly related to the passing of the mesoscale fronts and the cross-shelf water transport caused by the eddies and upwellings, which lead to the increase of the baroclinic instability. Conclusions. Analysis of the seasonal and vertical variability of the submesoscale currents in the Black Sea deep and shelf zones evidences about the decisive role of the baroclinic instability triggered mainly by the heterogeneity of MLD on their dynamics.
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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
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