Ventilation of the northern Baltic Sea
The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bothnian Bay, are well oxygenated. Lateral inflows or a ventilation due to co...
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ftcopernicus:oai:publications.copernicus.org:os76382 2023-05-15T16:39:13+02:00 Ventilation of the northern Baltic Sea Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Heydebreck, Daniel 2020-07-03 application/pdf https://doi.org/10.5194/os-16-767-2020 https://os.copernicus.org/articles/16/767/2020/ eng eng doi:10.5194/os-16-767-2020 https://os.copernicus.org/articles/16/767/2020/ eISSN: 1812-0792 Text 2020 ftcopernicus https://doi.org/10.5194/os-16-767-2020 2020-07-20T16:22:02Z The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bothnian Bay, are well oxygenated. Lateral inflows or a ventilation due to convection are possible mechanisms for high oxygen concentrations in the deep water of the northern Baltic Sea. In March 2017, conductivity–temperature–depth (CTD) profiles and bottle samples, ice core samples, and brine were collected in the Bothnian Bay. In addition to hydrographic standard parameters, light absorption has been measured in all samples. A complementary numerical model simulation provides quantitative estimates of the spread of newly formed bottom water. The model uses passive and age tracers to identify and trace different water masses. Observations indicate a recent ventilation of the deep bottom water at one of the observed stations. The analysis of observations and model simulations shows that the Bothnian Bay is ventilated by dense water formed due to mixing of Bothnian Sea and Bothnian Bay surface water initializing lateral inflows. The observations show the beginning of the inflow and the model simulation demonstrates the further northward spreading of bottom water. These events occur during wintertime when the water temperature is low. Brine rejected during ice formation barely contributes to dense bottom water. Text ice core Copernicus Publications: E-Journals Ocean Science 16 4 767 780 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bothnian Bay, are well oxygenated. Lateral inflows or a ventilation due to convection are possible mechanisms for high oxygen concentrations in the deep water of the northern Baltic Sea. In March 2017, conductivity–temperature–depth (CTD) profiles and bottle samples, ice core samples, and brine were collected in the Bothnian Bay. In addition to hydrographic standard parameters, light absorption has been measured in all samples. A complementary numerical model simulation provides quantitative estimates of the spread of newly formed bottom water. The model uses passive and age tracers to identify and trace different water masses. Observations indicate a recent ventilation of the deep bottom water at one of the observed stations. The analysis of observations and model simulations shows that the Bothnian Bay is ventilated by dense water formed due to mixing of Bothnian Sea and Bothnian Bay surface water initializing lateral inflows. The observations show the beginning of the inflow and the model simulation demonstrates the further northward spreading of bottom water. These events occur during wintertime when the water temperature is low. Brine rejected during ice formation barely contributes to dense bottom water. |
format |
Text |
author |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Heydebreck, Daniel |
spellingShingle |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Heydebreck, Daniel Ventilation of the northern Baltic Sea |
author_facet |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Heydebreck, Daniel |
author_sort |
Neumann, Thomas |
title |
Ventilation of the northern Baltic Sea |
title_short |
Ventilation of the northern Baltic Sea |
title_full |
Ventilation of the northern Baltic Sea |
title_fullStr |
Ventilation of the northern Baltic Sea |
title_full_unstemmed |
Ventilation of the northern Baltic Sea |
title_sort |
ventilation of the northern baltic sea |
publishDate |
2020 |
url |
https://doi.org/10.5194/os-16-767-2020 https://os.copernicus.org/articles/16/767/2020/ |
genre |
ice core |
genre_facet |
ice core |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-16-767-2020 https://os.copernicus.org/articles/16/767/2020/ |
op_doi |
https://doi.org/10.5194/os-16-767-2020 |
container_title |
Ocean Science |
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16 |
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4 |
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767 |
op_container_end_page |
780 |
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1766029539481223168 |