The BSH western Baltic Sea system (BSH)

Western Baltic Sea: 09°20'00”E - 14°54'35”E ; 53°13'45”N - 56°26'45”N

BSHcmod V4 (Primitive Equations) (Dick et al..)

Daily

Spherical: zonal: 50”, meridional: 30” (approx. 900m)

(general) movable s-level co-ordinates, dynamically controlled free surface up to 36 cells of variable thickness (ref. thickness: ³ 2m) bottom layer of 3-4 m thickness

Composite of: BSH soundings and data from other German authorities, gridded data of dhi and IOW

Daily forecasts of German Weather Service (DWD) for: - wind,

- air pressure,

- temperature,

- specific humidity,

- cloud cover

Bulk formula

Lateral forcing data from operational North Sea / Baltic Sea model of BSH (5 km).

Interactive two-way coupling with parent model.

Daily river run off

Half slip condition

Non linear bottom friction

Smagorinsky scheme

upstream scheme with flux-correction

Ri dependent mixing length scheme

Yes, drying and flooding of tidal flats

BSHdmod V4 + GKSS SPM module (Pleskachevsky et al. 2002 and 2005, Geyer et al.., 2006)

advection, horizontal and vertical diffusion due to currents and waves, sedimentation, re-suspension, erosion, consumption and bioturbation

bottom distribution of fine grained sediment

lateral sources of SPM (e.g. fluvial input)

Lateral forcing data form North Sea / Baltic Sea model of BSH (5 km)

BSHdmod V4 + ERGOM (Neumann et al., 2002)

10 “bulk” state variables:

- e.g. 3 phytoplankton groups (cyanobacteria, flagellates and diatoms),

- 2 bulk zooplankton groups (micro/meso),

- bacteria,

- detritus,

- organic dissolved matter,

- nutrient concentrations,

- nitrogen in sediment and oxygen

Simulation of nutrient-phytoplankton dynamics resolving nitrogen and, phosphoruscarbon, oxygen, phosphorus and silicon cycles and including oxygen dynamics.

- river inputs

- Lateral forcing data from North Sea / Baltic Sea model of BSH (5 km)

- Atmospheric inputs for nitrogen and phosphorus