Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland
The distribution of nutrients (i.e. water contents, organic carbon, nitrogen and phosphate concentrations) was investigated in the upper 20 cm of coastal marine sediments off southwestern Finland. Bottom sediments were sampled along a transect from the Aurajoki river mouth to the open Archipelago Se...
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Boreal Environment Research Publishing Board
2024
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/577990 2024-09-09T19:34:21+00:00 Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland Müller, A. 2024-06-27T13:44:29Z 229-237 application/pdf http://hdl.handle.net/10138/577990 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 3 2 http://hdl.handle.net/10138/577990 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z The distribution of nutrients (i.e. water contents, organic carbon, nitrogen and phosphate concentrations) was investigated in the upper 20 cm of coastal marine sediments off southwestern Finland. Bottom sediments were sampled along a transect from the Aurajoki river mouth to the open Archipelago Sea. Towards the Archipelago Sea, sediments showed increasing water and organic carbon contents and decreasing C/N ratios. Phosphate values in the sediments did not show any significant variation along the transect, but increased towards the surface. Most sediments were classified as mud. Resuspension processes can be expected to be dominant in the harbour. Organic carbon contents increase as a result of lateral transport of the lighter fraction towards the more distal stations. Sedimentation is greatest in the small but deep basins in the more distal regions of the transect. The decrease in C/N ratios may be due to the reduced importance of denitrification during the decay of organic matter. Oxygen depletion increases in the sediments because of higher organic carbon contents at the outer stations. Phosphate values increase towards the sediment surface, possibly indicating upward diffusion of phosphorus. Phosphorus depleted surface waters of the Baltic Sea may show greater influence with increasing distance from the harbour. This may be compensated for the higher proportion of fine material which can bind phosphate at the more distal sampling stations. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
The distribution of nutrients (i.e. water contents, organic carbon, nitrogen and phosphate concentrations) was investigated in the upper 20 cm of coastal marine sediments off southwestern Finland. Bottom sediments were sampled along a transect from the Aurajoki river mouth to the open Archipelago Sea. Towards the Archipelago Sea, sediments showed increasing water and organic carbon contents and decreasing C/N ratios. Phosphate values in the sediments did not show any significant variation along the transect, but increased towards the surface. Most sediments were classified as mud. Resuspension processes can be expected to be dominant in the harbour. Organic carbon contents increase as a result of lateral transport of the lighter fraction towards the more distal stations. Sedimentation is greatest in the small but deep basins in the more distal regions of the transect. The decrease in C/N ratios may be due to the reduced importance of denitrification during the decay of organic matter. Oxygen depletion increases in the sediments because of higher organic carbon contents at the outer stations. Phosphate values increase towards the sediment surface, possibly indicating upward diffusion of phosphorus. Phosphorus depleted surface waters of the Baltic Sea may show greater influence with increasing distance from the harbour. This may be compensated for the higher proportion of fine material which can bind phosphate at the more distal sampling stations. |
format |
Article in Journal/Newspaper |
author |
Müller, A. |
spellingShingle |
Müller, A. Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
author_facet |
Müller, A. |
author_sort |
Müller, A. |
title |
Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
title_short |
Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
title_full |
Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
title_fullStr |
Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
title_full_unstemmed |
Hydrodynamics and nutrient distribution in bottom sediments of the Archipelago Sea, southwestern Finland |
title_sort |
hydrodynamics and nutrient distribution in bottom sediments of the archipelago sea, southwestern finland |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/577990 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 3 2 http://hdl.handle.net/10138/577990 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1809903831651188736 |