Tidal oscillations in the Baltic Sea

Medvedev, Igor; Rabinovich, Alexander B.; Kulikov, E. A.

doi:10.1134/s0001437013050123

Cited by 58 publications

(38 citation statements)

References 10 publications

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“…Construction of such spectra makes it possible to reveal certain features of the formation of tidal oscilla tions, which are not seen in usual spectra and to inves tigate the fine structure of tidal oscillations [8]. The experience of the analysis done in [5] demonstrated that even in basins with weak tides, in particular, in the Baltic Sea, high resolution spectra appear to be a very effective means of tidal analysis, which makes it possi ble to distinguish and investigate a wide set of tidal harmonics.…”

Section: Observations Of Gravitationalmentioning

confidence: 98%

“…can appear in the sea level oscillations [2,3]. Sea level spectra at stations Narva (Estonia) and Daugava (Lithuania) at the eastern and southeastern coasts of the Baltic Sea have similar characteristics [5].…”

Section: Introductionmentioning

confidence: 98%

“…The prevalence of one factor or another depends on the specific physical and geographical conditions of the observation region [20]. It is pointed out in [5] that probably the main factor that causes the appearance of radiational harmonics at several sta tions on the Baltic coast is the breeze winds. This par ticular factor primarily depends on the specific region of observations, whereas the variations in the air/sea temperature and atmospheric tides do not possess such selectivity (i.e., both factors are supposed to have a similar influence at all stations).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the regular and deterministic character of tidal motions, sharp tidal peaks are evident in the spectra of sea level oscillations over almost the entire sea basin [5]. Long time series of hourly observations, which became available recently, allowed us to study tides in this sea with greater detail and accuracy than was possible before and construct high resolution spectra for the tidal frequency bands [5]. As a result, we revealed a number of new and interesting effects, in particular, the existence of "radiational tides" in certain regions of the Baltic Sea.…”

Section: Introductionmentioning

confidence: 99%

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Radiational tides at the southeastern coast of the Baltic Sea

Rabinovich

Medvedev

2015

Oceanology

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The tides in the Baltic Sea are weak but unmistakably recognizable in sea level spectra. Multiyear hourly tide gauge series enable us to examine specific tidal properties in detail and to identify some unex pected effects. Two nearby stations on the southeastern coast of the sea, namely Baltiysk, located in the strait connecting the Vistula Lagoon to the Baltic Sea, and Otkrytoe, on the coast of the Curonian Lagoon, are found to have very different character of tidal motions. Based on 13 years of simultaneous observations at these stations we constructed high resolution spectra of sea level fluctuations that demonstrated that the tidal spectrum at Baltiysk is "classical" with sharp peaks corresponding to the major tidal constituents: M . Unlike at Baltiysk, the main tidal peak at Otkrytoe is at the S 1 frequency; the K 1 , P 1 , and S 2 tidal harmonics also have significant peaks, while the other harmonics (including M 2 and O 1 ) are undistin guishable. Further analysis indicated that the tides at Baltiysk are generated by ordinary gravitational tidal forces, while at Otkrytoe they are induced by solar radiation, specifically by the breeze winds creating wind setups and setdowns in the Curonian Lagoon. Moreover, our findings demonstrate that the observed K 1 and P 1 peaks at Otkrytoe are related not to gravitational forces but to the seasonal modulation of the S 1 radiational tidal constituent. The separate analysis of the "summer" and "winter" sea level spectra at Otkrytoe reveals prominent radiational tidal peaks (S 1 and S 2 ) in summer and the absence of these peaks in winter. The results of the analysis support the assumption that these motions are generated by the breeze winds associated with the sea/land temperature contrasts, which are substantial during the warm (ice free) season but vague during the cold season when ice cover diminishes these contrasts.

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Section: Observations Of Gravitationalmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiational tides at the southeastern coast of the Baltic Sea

Rabinovich

Medvedev

2015

Oceanology

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“…This variation is usually less than 10% of the total range of water level variations (Suursaar et al, 2006a) and about 50% of the typical (annual) standard deviation of the instantaneous water level recordings (Johansson et al, 2001;Suursaar et al, 2006a). The contribution from diurnal tides is usually a few centimetres, reaching 10 cm in selected locations of the Gulf of Finland (Leppäranta and Myrberg, 2009) and 17-19 cm in the easternmost region of this gulf (Neva Bay, Medvedev et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Separation of the Baltic Sea water level into daily and multi-weekly components

Soomere

Eelsalu

Kurkin

et al. 2015

Continental Shelf Research

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Blending of satellite and tide gauge sea level observations and its assimilation in a storm surge model of the North Sea and Baltic Sea

Madsen

Høyer

et al. 2015

JGR Oceans

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Coastal storm surge forecasts are typically derived from dedicated hydrodynamic model systems, relying on Numerical Weather Prediction (NWP) inputs. Uncertainty in the NWP wind field affects both the preconditioning and the forecast of sea level. Traditionally, tide gauge data have been used to limit preconditioning errors, providing point information. Here we utilize coastal satellite altimetry sea level observations. Careful processing techniques allow data to be retrieved up to 3 km from the coast, combining 1 Hz and 20 Hz data. The use of satellite altimetry directly is limited to times when the satellite passes over the area of interest. Instead, we use a stationary blending method developed by Madsen et al. (2007) to relate the coastal satellite altimetry with corresponding tide gauge measurements, allowing generation of sea level maps whenever tide gauge data are available. We apply the method in the North Sea and Baltic Sea, including the coastal zone, and test it for operational nowcasting and hindcasting of the sea level. The feasibility to assimilate the blended product into a hydrodynamic model is assessed, using the ensemble optimal interpolation method. A 2 year test simulation shows decreased sea level root mean square error of 7–43% and improved correlation by 1–23% in all modeled areas, when validated against independent tide gauges, indicating the feasibility to limit preconditioning errors for storm surge forecasting, using a relatively cost effective assimilation scheme.

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Tidal oscillations in the Baltic Sea

Cited by 58 publications

References 10 publications

Radiational tides at the southeastern coast of the Baltic Sea

Radiational tides at the southeastern coast of the Baltic Sea

Separation of the Baltic Sea water level into daily and multi-weekly components

Blending of satellite and tide gauge sea level observations and its assimilation in a storm surge model of the North Sea and Baltic Sea

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