黑海海盐层长期演化的基本规律

IF 0.7 Q4 OCEANOGRAPHY
A. Mizyuk, M. V. Senderov, G. Korotaev
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引用次数: 0

摘要

意图目前,对黑海岩盐分层形成过程的研究很少。盆地的当前状态被认为接近平衡。然而,经过分析,长期观测证明,海面层有脱盐和深水盐碱化的趋势。本研究的目的是获得该盆地岩盐分层形成的完整模式及其长期气候演变的特征时间尺度。方法和结果。将受博斯普鲁斯海峡水交换、河流径流、降水和蒸发影响而形成的黑海环流的数值计算与之前使用NEMO模型获得的实验室模拟结果进行了比较。结果表明,博斯普鲁斯海峡上下游洋流形成的时间周期具有20年的特征性时间尺度。博斯普鲁斯海峡的水交换对外部条件的适应期相对较短,这证明在气候尺度上,海峡应该处于准平衡状态。数值实验结果还表明,在最初设定的黑海恒定盐度的背景下,由于河流径流对上层40米的盐层进行了脱盐,垂直岩盐分层形成得相当快。这导致在10–40米的地层中形成了盐跃层。在更深的地层中,由于马尔莫拉海的进水,盐度缓慢增加。每一项计算都表明,表层的强烈脱盐持续70-80年,因此盐度增长缓慢。结论。因此,盆地分层对外部因素变化的特征适应期为70–100年。在平衡状态确定后,盆地场发生缓慢的准平稳演化。对所得结果的分析使我们能够推导出描述岩盐分层缓慢演化的方程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Basic Regularities of the Haline Stratification Long-Term Evolution in the Black Sea
Purpose. At present the process of formation of haline stratification in the Black Sea is poorly studied. The current state of the basin is considered to be close to equilibrium. However, having been analyzed, the long-term observations testify to a tendency towards desalination of the sea surface layer and salination of the deep waters. The goal of the study is to obtain a complete pattern of the haline stratification formation in the basin and the characteristic time scales of its long-term climatic evolution. Methods and Results. Numerical calculations of the Black Sea circulation which is formed being influenced by water exchange through the Bosporus, river runoff, precipitation and evaporation, are compared with the laboratory simulation results obtained previously using the NEMO model. It is shown that the time period of formation of the upper and lower Bosporus currents is of a characteristic time scale 20 years. Relatively short period of adaptation of the Bosporus water exchange to the external conditions testifies that on the climatic scale, the strait should be in a quasi-equilibrium state. The results of the numerical experiments also show that, against the background of the initially preset constant salinity of the Black Sea, the vertical haline stratification is formed rather rapidly due to the fact that the upper forty-meter layer is desalinated by the river runoffs. This leads to formation of a halocline in the 10–40 m layer. In the deeper layers, salinity increases slowly owing to the Marmora Sea water inflow. Each of the calculations shows that intense desalination of the surface layer lasts 70–80 years, whereupon its salinity grows slowly. Conclusions. As a result, the characteristic adaptation period of the basin stratification to the changes in the external factors constitutes 70–100 years. After the equilibrium regime is settled, slow quasi-stationary evolution of the basin fields takes place. Analysis of the obtained results enabled us to deduce the equations for describing slow evolution of the haline stratification.
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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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