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Seasonal variability in the Baltic Sea level

100%

Stramska M., Kowalewska-Kalkowska H., Swirgon M.

Oceanologia

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2013

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tom 55

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nr 4

2

Sea surface temperature retrieval from MSG-SEVIRI data in the Baltic Sea area

100%

Wozniak M., Krezel A.

Oceanologia

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2010

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tom 52

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nr 3

331-344

The aim of the paper was to confirm the proposition that the classical SST algorithms MCSST and NLSST originally prepared for AVHRR data could also be used for Meteosat/SEVIRI data with satisfactory accuracy in the mid-latitude region, where the spatial resolution is about 7×7 km. The research was performed in the southern Baltic Sea (between 13◦E 53◦N and 21◦E 58◦N). Data were collected in all the seasons of 2007. The coefficients were found by means of regression analysis. SSTs determined on the basis of AVHRR data were used in the regression analysis instead of in situ data. A set of paired AVHRR and SEVIRI images spaced no more than 8 minutes apart were compared. The results show that the method is capable of producing sea surface temperatures with a statistical error (standard deviation) of 1◦C.

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The role of the spatial resolution of a three-dimensional hydrodynamic model for marine transport risk assessment

80%

Andrejev O., Soomere T., Sokolov A., Myrberg K.

Oceanologia

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2011

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tom 53

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nr (1-TI)

The paper addresses the sensitivity of a novel method for quantifying the environmental risks associated with the current-driven transport of adverse impacts released from offshore sources (e.g. ship traffic) with respect to the spatial resolution of the underlying hydrodynamic model. The risk is evaluated as the probability of particles released in different sea areas hitting the coast and in terms of the time after which the hit occurs (particle age) on the basis of a statistical analysis of large sets of 10-day long Lagrangian trajectories calculated for 1987–1991 for the Gulf of Finland, the Baltic Sea. The relevant 2D maps are calculated using the OAAS model with spatial resolutions of 2, 1 and 0.5 nautical miles (nm) and with identical initial, boundary and forcing conditions from the Rossby Centre 3D hydrodynamic model (RCO, Swedish Meteorological and Hydrological Institute). The spatially averaged values of the probability and particle age display hardly any dependence on the resolution. They both reach almost identical stationary levels (0.67–0.69 and ca 5.3 days respectively) after a few years of simulations. Also, the spatial distributions of the relevant fields are qualitatively similar for all resolutions. In contrast, the optimum locations for fairways depend substantially on the resolution, whereas the results for the 2 nm model differ considerably from those obtained using finer-resolutionmodels. It is concluded that eddy-permitting models with a grid step exceeding half the local baroclinic Rossby radius are suitable for a quick check of whether or not any potential gain from this method is feasible, whereas higher-resolution simulations with eddy-resolving models are necessary for detailed planning. The asymptotic values of the average probability and particle age are suggested as an indicator of the potential gain from the method in question and also as a new measure of the vulnerability of the nearshore of water bodies to offshore traffic accidents.

Ograniczanie wyników

3 Oceanologia

1 Andrejev O.

1 Kowalewska-Kalkowska H.

1 Krezel A.

1 Myrberg K.

1 Sokolov A.

1 Soomere T.

1 Stramska M.

1 Swirgon M.

1 Wozniak M.

1 2013

1 2011

1 2010

Seasonal variability in the Baltic Sea level

Sea surface temperature retrieval from MSG-SEVIRI data in the Baltic Sea area

The role of the spatial resolution of a three-dimensional hydrodynamic model for marine transport risk assessment