Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period
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1 7th Study Conference on BALTEX, Borgholm, Island of Öland, Sweden Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period Andreas Lehmann, Hans-Harald Hinrichsen, Klaus Getzlaff, Kai Myrberg* * Finnish Environmental Institute/Marine Research Center, Helsinki, Finland
2 Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period Motivation
3 Motivation Extent of hypoxic & anoxic bottom water Axe 2010 Modelling Hypoxia 13 June 2013
4 Motivation Extent of hypoxic & anoxic bottom water Subheadline (Arial 18 pt) Axe 2010 Modelling Hypoxia 13 June 2013
5 Motivation Extent of hypoxic & anoxic bottom water the detailed distribution and evolution of oxygenated, hypoxic and anoxic areas is required for studying oxygen related processes such as habitat utilisation of spawning fish, survival rates of their eggs and settlement probabilities of juveniles state of the art physical-biogeochemical models are of limited use because of: uncertainties in the models (e.g. 16 state variables, Daewel & Schrum 2013) uncertainties in forcing functions inaccurate nutrient inputs or initial conditions Coupling between nutrient cycles and oxygen conditions at the bottom expensive to run Modelling Hypoxia 13 June 2013
6 Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period Methods Hydrodynamic & oxygen consumption model
7 Methods Hydrodynamic & oxygen consumption model BSIOM - 3D coupled sea ice-ocean model of the Baltic Sea (Lehmann & Hinrichsen 2000) Horizontal resolution 2.5 km 60 vertical levels Model domain: Baltic Sea including Skagerrak & Kattegat Forcing: river runoff (Kronsell & Andersson 2011), atmosphere SMHI (Lars Meuller pers. comm. ) Period OXYCON Oxygen consumption model (Hansen & Bendtsen 2009; Jonasson et al. 2012) Based on local carbon budget for North Sea Baltic Sea transition area One pelagic oxygen sink Two benthic oxygen sinks Adjusted oxygen consumption rates to annual mean primary production of the different sub-basins (Wasmund et al. 2001) Modelling Hypoxia 13 June 2013
8 Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period
9 ICES sub-divisions
10 SD 25 Bornholm Basin ICES - BSIOM
11 Comparison ICES sub-divisions - BSIOM SD 25 SD 26
12 Comparison ICES sub-divisions - BSIOM SD 28 SD 30
13 Comparison GEOMAR CTD - BSIOM SD 26
14 Comparison GEOMAR CTD - BSIOM SD 25
15 hypoxic (< 2ml/l) conditions 2002 &
16 Frequency of hypoxic (< 2ml/l) conditions Based on monthly means
17 Extent of hypoxic & anoxic bottom water
18 Baltic cod reproductive volumes Time series of the Baltic cod reproduction volumes in the Bornholm basin based on Observations (ICES) and hindcast model results (BSIOM), location with water depths > 69 m
19 Modelling the extent of hypoxia and anoxia in the Baltic Sea for the period Conclusions
20 Conclusions Model results are in reasonable well agreement with observations The coupled hydrodynamic - oxygen consumption model is suitable to describe the development of oxygenated, hypoxic and anoxic areas in the Baltic Sea The model is a suitable tool for detailed analysis of ecological and environmental interactions (e.g. habitat estimation studies, reproduction volumes) Limitations are due to constant basin-wide oxygen consumptions rates associated with the annual mean primary production This offers a possibility for sensitive studies (temperature, eutrophication etc.) Improvements could be achieved if better spatially and temporally resolved primary production rates for the different sub-basins would be available
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