Articles | Volume 10, issue 4
Ocean Sci., 10, 611–632, 2014
https://doi.org/10.5194/os-10-611-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Ocean Sci., 10, 611–632, 2014
https://doi.org/10.5194/os-10-611-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article 04 Jul 2014
Research article | 04 Jul 2014
Residual circulation and freshwater transport in the Dutch Wadden Sea: a numerical modelling study
M. Duran-Matute et al.
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Local mean sea level often varies strongly from year to year (on the order of a few decimeters). This is mainly due to interannual variability in wind climate and atmospheric pressure. In this paper, regional differences in the sensitivity of mean sea level to atmospheric forcing are studied in an inter-tidal basin. Correcting for the atmospheric effects removes most of the interannual variability in mean sea level.
Erik Jacobs, Henry C. Bittig, Ulf Gräwe, Carolyn A. Graves, Michael Glockzin, Jens D. Müller, Bernd Schneider, and Gregor Rehder
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We use a unique data set of 8 years of continuous carbon dioxide (CO2) and methane (CH4) surface water measurements from a commercial ferry to study upwelling in the Baltic Sea. Its seasonality and regional and interannual variability are examined. Strong upwelling events drastically increase local surface CO2 and CH4 levels and are mostly detected in late summer after long periods of impaired mixing. We introduce an extrapolation method to estimate regional upwelling-induced trace gas fluxes.
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Based on months of profiling observations from a field campaign, we unravel how much biomass can sink out of a cyanobacteria bloom in the Baltic Sea and potentially contribute to the extension of death zones. More importantly, we show how this information can be accurately retrieved from long-term surface measurements made on cargo vessels, when combining them with modelled temperature data. This enables a better understanding of a severe concern for the Baltic’s good environmental status.
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Hagen Radtke, Sandra-Esther Brunnabend, Ulf Gräwe, and H. E. Markus Meier
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During the last century, salinity in the Baltic Sea showed a multidecadal oscillation with a period of 30 years. Using a numerical circulation model and wavelet coherence analysis, we demonstrate that this variation has at least two possible causes. One driver is river runoff which shows a 30-year variation. The second one is a variation in the frequency of strong inflows of saline water across Darss Sill which also contains a pronounced 30-year period.
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