波罗的海海平面的立体振荡

IF 0.7 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Eugenii Zakharchuk, V. Sukhachev, Natal'ya Tihonova, E. Litina
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引用次数: 0

摘要

本文的主要目的是估算 NEMO 3.6 区域再分析数据在年际和季节变化尺度范围内真实描述波罗的海立体水位振荡、时空结构研究和现代海平面变化原因的能力。通过评估各种统计精度标准,对根据海洋观测站的温度和盐度接触测量数据和区域再分析数据计算得出的立体海平面振荡序列进行了比较。论文表明,再分析数据能够相当准确地再现波罗的海立体水位振荡。对线性趋势的估计表明,1993-2020 年期间,在波罗的海开阔海域和芬兰湾西部,立体海平面主要在下降,而在波的尼亚湾,立体海平面在上升。对立体海平面振荡的谐波分析表明,季节变化范围内的年谐波 a 对立体海平面振荡起主要作用,其振幅明显超过谐波 sa、ta 和 qa 的振幅。热力分量对季节性立体水位振荡有主要影响,只有在西南海域才有显著的热力分量影响。在本报告所述期间,波罗的海大部分地区的谐波 a、sa、ta 和 qa 的振幅变化呈正线性趋势,但在波罗的海西南部开阔海域,季节性立体水位振荡的所有四个谐波的振幅都有所下降。总之,根据所获得的结果,可以推测波罗的海立体水位振荡的现代区域变化与气温升高、降水增加、风力减弱、上层准均质层脱盐以及与北海咸水交换造成的深层和近底层水域盐度增加有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Steric Oscillations of the Baltic Sea Level
The main purpose of the paper is to estimate the capabilities of NEMO 3.6 regional reanalysis data for a realistic description of the Baltic Sea steric level oscillations, the spatio-temporal structure research and causes of modern sea level changes, induced by fluctuations in water density, in the range of interannual and seasonal variability scales. Comparison of the steric level oscillations series calculated from contact measurements of temperature and salinity at oceanographic stations and from regional reanalysis data is carried out by evaluating various statistical accuracy criteria. The paper shows that the reanalysis data allow reproducing the Baltic Sea steric level oscillations quite accurately. Estimates of linear trends indicate that in the period 1993–2020 in the open Baltic and in the west of the Gulf of Finland, the steric sea level is mainly decreasing, while in the Gulf of Bothnia the steric level is increasing. Harmonic analysis of steric level oscillations showed that the annual harmonic a in the range of seasonal variability makes a predominant contribution to steric level oscillations, its amplitude significantly exceeds the amplitudes of the harmonics sa, ta and qa. The thermosteric component has the main influence on seasonal steric level oscillations, and only in the south-west of the sea there is a significant influence of the halosteric component. During the period under review, positive linear trends were observed in the amplitudes changes of the harmonics a, sa, ta and qa in most regions of the Baltic Sea, however, in the south-west of the open Baltic, a decrease in the amplitudes of all four harmonics of seasonal steric level oscillations was observed in the south-west part of the Open Baltic Sea. In conclusion, based on the obtained results, it is assumed that the identified modern regional changes in the Baltic Sea steric level oscillations are associated with an increase in air temperature, an increase in precipitation, a decrease in wind intensity, a desalination of the upper quasi-homogeneous layer and an increase in deep and near-bottom waters salinity caused by water exchange with salty waters of the North Sea.
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来源期刊
Russian Journal of Earth Sciences
Russian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.90
自引率
15.40%
发文量
41
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