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1

The comparison of the forecasted and measured currents in the deep part of the Southern Baltic Sea in 1999

Krzymiński W.

Biuletyn Instytutu Morskiego w Gdańsku

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2001

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Vol. 28, No. 2

55--64

EN

This paper presents results of the investigation carried out in frame of research project of Institute of Meteorology and Water Management Maritime Branch in Gdynia (IWM-MB) in the y ear 2000. The goal of the project was to determine the conformity of the sea current forecasts for the layer 8 - I 2 meters of the open sea part of the Southern Baltic Sea, as produced by the hydrodynamic model of the Baltic Sea- HIROMB [5}, with the measurements. Contrary to the results of previous experiments as in the case of the POLRODEX ones [7, 8, 9}, during present study it was expected to detect behaviour of the model far from the influence of the boundary like coastline as well as bottom friction in the shallow water areas. The analysed data were collected during five routine cruises of r/v Baltica organized by IWMMBsince February until September I999 [10], when cruise track started/rom the Gdansk Deep, next along the northern border of the Polish EEZ, ending in the Bomholm Deep area usually. On the basis of the current vectors recorded by means of the ship mounted ADCP as the 250 m average values in the layer 7.5 to 12.5 meters, mean values related to the model grid have been calculated and statistically assessed. These mean vectors have been used for compan·son of forecasted values. Consequently, the sets of values of the differences between measured and predicted currents were statistically evaluated both regarding the direction and the module of the currents as well as the current vector components (Vx, Vy) separately.

2

Quality assessment of the hiromb water level forecast for the Polish coastal zone

Kowalska B., Stanisławczyk I., Mykita M.

Biuletyn Instytutu Morskiego w Gdańsku

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2001

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Vol. 28, No. 2

65--70

EN

The aim of this paper is to compare the observed water level and the results of HIROMB model for the same period. Real sea level values, collected in the data base of the Institute of Meteorology and Water Management in Gdynia were measured by Polish water gauges situated along tlze west part of coast and around the Gulf of Gdansk. The analysed data were from the period 15.08.1998 - 28.05.1999, and the forecast lead time was equal to 24 hours. The assumed reference level, equal to 500 cm, caused too high forecast levels and marked differences between observed and computed sea levels. In order to improve the results of modelling a new reference level has been established. Having introduced the new reference level, a better agreement between the observed and computed values was obtained in most cases. The validation of modelled results was carried out by means of the chosen statistical indicators.

3

HIROMB, an operational eddy-resolving model for the Baltic Sea

Funkquist L.

Biuletyn Instytutu Morskiego w Gdańsku

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2001

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Vol. 28, No. 2

7--16

EN

HIROMB is a 3-dimensional baroclinic model of the North Sea and the Baltic Sea, designed for daily operational use. The model is mainly developed by Eckhard Kleine at the German Federal Maritime and Hydrographic Agency (BSH) in Hamburg, Germany, and is based on a similar model, running in operational mode at that institution. The operational forecasts at SMHI starled already in 1995 with a daily 24-hour forecast and were later extended to 48 hours. The model is forced by SMHI's operational atmospheric model (HIRLAM), but also by river runoff from an operational hydrological model and wave radiation stress from a wind wave model. The present version of the model is set up on a nested grid, where a 12 nautical mile (nm) grid covers the whole area, while Skagerrak, Kattegat, the Belt Sea and the Baltic Sea are covered with a 1 nm grid. A parallelized version of the model has been developed and runs on a distributed memory parallel computer.

4

Comparison of measured and modelled water temperature for the southern Baltic Sea during 1998-2001

Piliczewski B.

Biuletyn Instytutu Morskiego w Gdańsku

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2001

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Vol. 28, No. 2

89--95

EN

The article presents results of verification of water temperature forecasts from HIROMB model, which were compared with every-day measurements from some selected JMGW coastal hydrological stations during 1998-2001. In addition to that the model results were also confronted with CTD measurements from the Gdańsk Deep.

5

Quality assessment of the HIROMB simulation

Eigenheer A.

Biuletyn Instytutu Morskiego w Gdańsku

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1999

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Vol. 26, No. 1

27--37

EN

The High Resolution Operational Model for the Baltic (HIROMB) consists of a leveled threedimensional primitive equation model, including one equation boundary layer dynamics and a viscous- plastic ice model. At SMHI it is driven by the High Resolution Limited Area meteorological Model (HIRLAM). and it has been running continuously in a pre-operational mode since October 1995. The quality assessment concentrates on the last year of the simulation from April 1997 to April 1998.