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Jönsson, Anette
Publications (3 of 3) Show all publications
Hordoir, R., Axell, L., Höglund, A., Dieterich, C., Fransner, F., Groger, M., . . . Haapala, J. (2019). Nemo-Nordic 1.0: a NEMO-based ocean model for the Baltic and North seas - research and operational applications. Geoscientific Model Development, 12(1), 363-386
Open this publication in new window or tab >>Nemo-Nordic 1.0: a NEMO-based ocean model for the Baltic and North seas - research and operational applications
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2019 (English)In: Geoscientific Model Development, ISSN 1991-959X, E-ISSN 1991-9603, Vol. 12, no 1, p. 363-386Article in journal (Refereed) Published
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:smhi:diva-5159 (URN)10.5194/gmd-12-363-2019 (DOI)000456302000003 ()
Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved
Danielsson, A., Jönsson, A. & Rahm, L. (2007). Resuspension patterns in the Baltic proper. Journal of Sea Research, 57(4), 257-269
Open this publication in new window or tab >>Resuspension patterns in the Baltic proper
2007 (English)In: Journal of Sea Research, ISSN 1385-1101, E-ISSN 1873-1414, Vol. 57, no 4, p. 257-269Article 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. (c) 2006 Elsevier B.V. All rights reserved.

Keywords
resuspension, wave friction velocity, wind patterns, sediment distribution, fluffy layer, Baltic Sea
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-758 (URN)10.1016/j.seares.2006.07.005 (DOI)000246389500002 ()
Available from: 2015-04-28 Created: 2015-04-22 Last updated: 2018-01-11Bibliographically approved
Jönsson, A., Broman, B. & Rahm, L. (2003). Variations in the Baltic Sea wave fields. Ocean Engineering, 30(1), 107-126
Open this publication in new window or tab >>Variations in the Baltic Sea wave fields
2003 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 30, no 1, p. 107-126Article in journal (Refereed) Published
Abstract [en]

The surface waves in the Baltic Sea are hindcast with the spectral wave model HYPAS during a 12-month period. The model results show a strong temporal and spatial variation in the wave field due to the physical dimensions of the different basins and the predominant wind field. The highest waves in the area are found in the outer part of Skagerrak, as well as in the central and southern parts of the Baltic Proper. To get significant waves above 6 m high, strong winds (15-20 m/s) must have been blowing for 6 to 24 h from a favourable direction over a deep area. (C) 2002 Elsevier Science Ltd. All rights reserved.

Keywords
wave modelling, HYPAS, significant wave height, Baltic Sea, kattegat, Skagerrak
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-1363 (URN)10.1016/S0029-8018(01)00103-2 (DOI)000178690600005 ()
Available from: 2015-08-10 Created: 2015-07-29 Last updated: 2018-01-11Bibliographically approved
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