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Resuspension patterns in the Baltic proper
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
2007 (English)In: Journal of Sea Research, ISSN 1385-1101, E-ISSN 1873-1414, Vol. 57, no 4, 257-269 p.Article in journal (Refereed) Published
Abstract [en]

Waves induce resuspension of surface sediments and contribute to the long-term mobilisation of particulate matter from erosion to accumulation bottoms. This has a major impact on the nutrient cycle in shallow seas by enhancing degradation, microbial production and recycling. The Baltic Sea represents such an area. The aim of this work is to analyse the spatial and temporal resuspension patterns in the Baltic Sea. To estimate the bottom friction velocity, modelled wave data are used in combination with data on grain size. This new data set is compared to a resuspension threshold of friction velocity to estimate the events of resuspension.

The variation in bottom friction velocity, resuspension frequency and duration are related to wind climate, fetch, water depth and sediment type. Substantial resuspension can be found down to 40–60 m, with durations from one day to as much as two weeks. The highest winds in the area are highly anisotropic with a dominance of S-SW-W winds and the highest resuspension frequencies are found along the shallow eastern coasts. A seasonal pattern is observed with relatively high friction velocities and high resuspension frequencies during winter. There is also a variation depending on grain size, where sediments with fine and medium sand have a considerably higher percentage of resuspension events than bottoms with other dominant grain sizes. Five sub-areas are identified, characterised by different sediment types, resuspension and wind characteristics. If, in the future, wind speed increases as predicted, resuspension of sediments will also increase with effects on the nutrient cycle.

Place, publisher, year, edition, pages
2007. Vol. 57, no 4, 257-269 p.
Keyword [en]
Resuspension, Wave friction velocity, Wind patterns, Sediment distribution, Fluffy layer, Baltic Sea
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:liu:diva-13421DOI: 10.1016/j.seares.2006.07.005OAI: oai:DiVA.org:liu-13421DiVA: diva2:20696
Note

On the day of the defence date the title of this article was Resuspension patterns in the Baltic proper, the Baltic Sea.

Available from: 2005-11-09 Created: 2005-11-09 Last updated: 2018-01-13
In thesis
1. Model Studies of Surface Waves and Sediment Resuspension in the Baltic Sea
Open this publication in new window or tab >>Model Studies of Surface Waves and Sediment Resuspension in the Baltic Sea
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wave heights and periods of surface waves in the Baltic Sea have been modelled for a two-year period (1999-2000) with the wave model Hypas on an 11x11-km grid scale. There is a clear seasonal variation with higher waves during winter and lower during summer. This is mainly a reflection of the wind climate in the area where the winters are windier than the summers. The largest waves are found in the Skagerrak and over the deeper, eastern areas in the Baltic Proper.

In the Baltic Sea, the surface waves influence the bottom sediment by initiating resuspension down to 80 m depths. This process is dependent not only on the waves but also on the varying grain size diameters. Fine and medium sand resuspend more often than other sediment types, and these sediments cover together about 25% of the Baltic Proper area. On average sediment is here resuspended 4-5 times per month with a duration for each event of 22 hours. The highest resuspension frequencies are found on the eastern and southern side of the Baltic Proper.

During resuspension sediment grains are lifted up into the water mass and matters earlier bound in the sediment can be released. This may stimulate both production and degradation of organic matter.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2005. 49 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 332
Keyword
Surface waves, Wave model, Wave friction velocity, Resuspension, Sediment dynamics, Nitrogen fixation, Baltic Sea, Havsvågor, Östersjön, Oceanografi, Sediment
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:liu:diva-4680 (URN)91-85299-94-4 (ISBN)
Public defence
2005-09-23, Elysion, Hus T, Campus Valla, Linköpings universitet, Linköping, 10:00 (English)
Opponent
Supervisors
Available from: 2005-11-09 Created: 2005-11-09 Last updated: 2018-01-13Bibliographically approved

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Danielsson, ÅsaJönsson, AnetteRahm, Lars

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