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Resuspension patterns in the Baltic proper
SMHI, Samhälle och säkerhet.
SMHI, Forskningsavdelningen, Oceanografi.
2007 (engelsk)Inngår i: Journal of Sea Research, ISSN 1385-1101, E-ISSN 1873-1414, Vol. 57, nr 4, s. 257-269Artikkel i tidsskrift (Fagfellevurdert) 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. (c) 2006 Elsevier B.V. All rights reserved.

sted, utgiver, år, opplag, sider
2007. Vol. 57, nr 4, s. 257-269
Emneord [en]
resuspension, wave friction velocity, wind patterns, sediment distribution, fluffy layer, Baltic Sea
HSV kategori
Forskningsprogram
Oceanografi
Identifikatorer
URN: urn:nbn:se:smhi:diva-758DOI: 10.1016/j.seares.2006.07.005ISI: 000246389500002OAI: oai:DiVA.org:smhi-758DiVA, id: diva2:808429
Tilgjengelig fra: 2015-04-28 Laget: 2015-04-22 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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