黑海海平面振荡在大频率范围内的方差分析

IF 0.7 Q4 OCEANOGRAPHY
I. Medvedev
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引用次数: 2

摘要

基于对黑海的长期观测,研究了五个不同频率范围内海平面振荡变化的空间分布特征。利用23个沿海测潮仪每小时进行的一系列海平面观测,分析了中尺度和天气变化。为了评估季节性和年际海平面变化,使用了瓦尔纳、乌斯特·杜奈斯克、敖德萨、塞瓦斯托波尔、图普塞、波蒂和巴统站获得的长期月平均海平面值。每小时的观测允许计算2小时至70天的海平面光谱,以及月平均海平面值——70天至10年的光谱。在较宽的频率范围内分析了黑海平面振荡频谱的形成。对于五个选定的频率变化范围中的每一个,都对其对非潮汐海平面变化总能量的贡献进行了定量评估。黑海海平面年际振荡的变化相对均匀,在28至37厘米2之间。季节性海平面振荡的范围更广:16–37厘米2。年内海平面振荡因地区而异:塞瓦斯托波尔记录的最小值为20厘米2,波蒂和卡斯佩罗夫卡记录的最大值高达35厘米2。一般来说,天气和中尺度海平面振荡证明了水域上空方差分布的显著不均匀性。在黑海西北部的浅水区观测到由表面风效应产生的最高值。在黑海高加索海岸(图普塞、波蒂、巴统)和克里米亚海岸附近(塞瓦斯托波尔),季节性和年内海平面振荡的变化超过天气性海平面振荡约1.5–2倍,而在黑海西北部,天气成分对总海平面变化的贡献最大。鸣谢:本研究是在FASO的国家任务框架内进行的,俄罗斯主题编号:0149-2018-015“变形岩石圈板块的构造和海洋岩石圈的地球动力学演化:北极和从太平洋到欧亚大陆的过渡带的地球动力学演变;俯冲带、边缘海和内海以及海岸带灾难性和潜在危险过程的发展,对其地学生态后果的分析f大陆偏远地区和洋内区域、边缘海和内海的矿物”,并在RFBR第16-35-60071号拨款的资助下,“根据沿海和卫星观测数据以及数值建模,研究波罗的海、黑海和里海在数小时至数年的时间段内水平振荡形成的机制”。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of Variance of the Black Sea Level Oscillations in a Wide Range of Frequencies
Based on the long-term observations in the Black Sea, the features of spatial distribution of the sea level oscillations’ variance in five different frequency ranges were studied. The series of the hourly sea level observations carried out at 23 coastal tide gauges were used to analyze mesoscale and synoptic variability. To assess seasonal and inter-annual sea level variability, long-term monthly average level values obtained at the stations of Varna, Ust-Dunaisk, Odessa, Sevastopol, Tuapse, Poti, and Batumi were used. The hourly observations permitted to calculate the sea level spectra for the periods 2 hours – 70 days, and the monthly average sea level values – the spectra for the periods 70 days – 10 years. Formation of the Black Sea level oscillations’ spectrum was analyzed in a wide frequency range. For each of five chosen ranges of frequency variability, its contribution to the total energy of non-tidal sea level variations was quantitatively assessed. Variance of inter-annual sea level oscillations in the Black Sea is relatively homogenous and is within 28 to 37 cm 2 . The range of seasonal sea level oscillations is wider: 16–37 cm 2 . The intra-annual sea level oscillations differ significantly depending on the region: the smallest values are recorded in Sevastopol – 20 cm 2 , the largest ones – in Poti and Kasperovka – up to 35 cm 2 . In general, synoptic and mesoscale sea level oscillations testify to substantial inhomogeneity in the variance distribution over the water area. The highest values resulting from the surface wind effect are observed in the shallow northwestern part of the Black Sea. At the stations of the Caucasian coast of the Black Sea (Tuapse, Poti, Batumi) and near the Crimean coast (Sevastopol), variance of the seasonal and intra-annual sea level oscillations exceeds that of the synoptic ones by about 1.5–2 times, whereas in the Black Sea northwestern part, the greatest contribution to the total sea level variance is made by the synoptic component. Acknowledgements: the study is carried out within the framework of the state task of FASO, Russia on the theme No. 0149-2018-0015 “Tectonics of the deformed lithosphere plates and geodynamic evolution of the ocean lithosphere: geodynamic evolution of the Arctic and the transition zone from the Pacific Ocean to Eurasia; development of catastrophic and potentially dangerous processes in the subduction zones, marginal and internal seas, and coastal zone, analysis of their geo-ecological consequences; assessment and genesis of minerals of the continental remote areas and intra-oceanic regions, marginal and internal seas” and at financial support of the RFBR grant No. 16-35-60071 “Study of the mechanism of the level oscillation formation in the Baltic, Black and Caspian seas in the period ranges from hours to years based on the data of coastal and satellite observations, as well as numerical modeling”.
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
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25.00%
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