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 Bay, are well oxygenated. Lateral inflows or a ventilation due to convection...
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ftcopernicus:oai:publications.copernicus.org:osd76382 2023-05-15T16:39:10+02:00 Ventilation of the Northern Baltic Sea Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Neumann, Daniel 2019-07-17 application/pdf https://doi.org/10.5194/os-2019-48 https://www.ocean-sci-discuss.net/os-2019-48/ eng eng doi:10.5194/os-2019-48 https://www.ocean-sci-discuss.net/os-2019-48/ eISSN: 1812-0792 Text 2019 ftcopernicus https://doi.org/10.5194/os-2019-48 2019-12-24T09:48:49Z 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 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. Owing to the high latitudes of the northern Baltic, this region is regularly covered by sea ice during the winter season. In March 2017, the RV Maria S. Merian was for two days in the Bothnian Bay collecting ice core samples, brine water, and CTD profiles. The bulk sea ice salinity was on average 0.6 g/kg and in brine samples, a salinity of 11.5 g/kg and 17.8 g/kg have been measured. At one station, the CTD profiles indicated a recent ventilation event of the deep water. A water mass analysis showed that the ventilation is most probably due to mixing of Bothnian Sea and Bothnian Bay surface water which results in sufficient dense water able to replace older bottom water. However, the high salinity of brine provides the potential for forming dense bottom water masses as well. Text ice core Sea ice Copernicus Publications: E-Journals |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
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 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. Owing to the high latitudes of the northern Baltic, this region is regularly covered by sea ice during the winter season. In March 2017, the RV Maria S. Merian was for two days in the Bothnian Bay collecting ice core samples, brine water, and CTD profiles. The bulk sea ice salinity was on average 0.6 g/kg and in brine samples, a salinity of 11.5 g/kg and 17.8 g/kg have been measured. At one station, the CTD profiles indicated a recent ventilation event of the deep water. A water mass analysis showed that the ventilation is most probably due to mixing of Bothnian Sea and Bothnian Bay surface water which results in sufficient dense water able to replace older bottom water. However, the high salinity of brine provides the potential for forming dense bottom water masses as well. |
format |
Text |
author |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Neumann, Daniel |
spellingShingle |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Neumann, Daniel Ventilation of the Northern Baltic Sea |
author_facet |
Neumann, Thomas Siegel, Herbert Moros, Matthias Gerth, Monika Kniebusch, Madline Neumann, 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 |
2019 |
url |
https://doi.org/10.5194/os-2019-48 https://www.ocean-sci-discuss.net/os-2019-48/ |
genre |
ice core Sea ice |
genre_facet |
ice core Sea ice |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-2019-48 https://www.ocean-sci-discuss.net/os-2019-48/ |
op_doi |
https://doi.org/10.5194/os-2019-48 |
_version_ |
1766029491701809152 |