Barystatic and steric sea level variations in the Baltic Sea and implications of water exchange with the North Sea in the satellite era

Article


Agha Karimi, Armin, Ghobadi-Far, Khosro and Passaro, Marcello. 2022. "Barystatic and steric sea level variations in the Baltic Sea and implications of water exchange with the North Sea in the satellite era." Frontiers in Marine Science. 9, pp. 1-8. https://doi.org/10.3389/fmars.2022.963564
Article Title

Barystatic and steric sea level variations in the Baltic Sea and implications of water exchange with the North Sea in the satellite era

ERA Journal ID210483
Article CategoryArticle
AuthorsAgha Karimi, Armin (Author), Ghobadi-Far, Khosro (Author) and Passaro, Marcello (Author)
Journal TitleFrontiers in Marine Science
Journal Citation9, pp. 1-8
Article Number963564
Number of Pages8
Year2022
Place of PublicationSwitzerland
ISSN2296-7745
Digital Object Identifier (DOI)https://doi.org/10.3389/fmars.2022.963564
Web Address (URL)https://www.frontiersin.org/articles/10.3389/fmars.2022.963564/full
Abstract

Satellite altimetry, satellite gravimetry, and in-situ subsurface salinity and temperature profiles are used to investigate the total, barystatic, and steric sea level variations in the Baltic Sea, respectively. To estimate the steric sea level, the density variations are weighted in deeper layers to prevent overestimation of their contribution. We show that the sum of barystatic and steric components exhibits excellent cross correlation (0.9) with satellite altimetry sea level variations and also explains up to 84% of total signal variability from 2002 to 2019. Considering the dominance of barystatic sea level variations in the basin and the limitation of satellite gravimetry in resolving the mass change in water-land transition zones (known as the leakage problem), the mismatch is likely attributed to the inadequate accuracy of the barystatic datasets. The total sea level and its contributors are further decomposed into seasonal, interannual, and decadal temporal components. It is shown that despite its insignificant contributions to seasonal and interannual changes, the steric sea level plays an important role in decadal variations. Additionally, we show that the interannual variations of the barystatic sea level are governed by the North Atlantic Oscillation in the basin. The sea level variation in the North Sea is also examined to deduce the water exchange patterns on different time scales. A drop in the North Sea level can be seen from 2005 to 2011 which is followed by the Baltic Sea level with a ~3-year lag, implying the outflow from the Baltic Sea to the North Sea.

Keywordsbaltic sea level, satellite altimetry, grace, steric sea level, barystatic sea level
ANZSRC Field of Research 2020401304. Photogrammetry and remote sensing
370803. Physical oceanography
Institution of OriginUniversity of Southern Queensland
Byline AffiliationsKTH Royal Institute of Technology, Sweden
Virginia Tech, United States
Ludwig Maximilian University of Munich, Germany
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