The Editor would like to thank the all reviewers of the papers submitted
to OCEANOLOGIA in 2000.
Dr. Soonmo An (Marine Science Institute, University of Texas, USA) •
Dr. Santiago J. Andrade (Marine Chemistry Laboratory, Argentine Institute of Oceanography, Bahía Blanca, Argentina) •
Assoc. Prof. Thomas S. Bianchi (Institute for Earth and Ecosystem Sciences, Tulane University,
New Orleans, USA) •
Dr. Ryszard Bojanowski (Institute of Oceanology PAS, Sopot, Poland) •
Assoc. Prof. Jerzy Bolalek (University of Gdansk, Poland) •
Prof. Erik Bonsdorff (Dept. of Biology, Åbo Akademi University, Finland) •
Prof. Alec C. Brown (University of Cape Town, South Africa) •
Prof. Juliusz Chojnacki (Agricultural University of Szczecin, Poland) •
Prof. Wojciech Donderski (Nicolaus Copernic s University, Torun, Poland) •
Prof. Danuta Frackowiak (University of Technology, Poznan, Poland) •
Dr. Ronnie Glud (Marine Biological Laboratory Helsingør, University of Copenhagen, Helsingør, Denmark) •
Prof. Renata Glosnicka (Institute of Maritime and Tropical Medicine, Gdynia, Poland) •
Prof. Howard R. Gordon (Dept. of Physics, University of Miami, USA) •
Assoc. Prof. Jozef Grabowski (University of Technology, Poznan, Poland) •
Prof. Krzysztof Jazdzewski (University of Lodz, Poland) •
Dr. Miroslaw Jonasz (MJC Optical Technology, Beaconsfield, Canada) •
Dr. Adam Krezel (University of Gdansk, Poland) •
Birger Larsen M.Sc. , Senior Research Geologist (GEUS Geological Survey of Denmark and Greenland, Copenhagen, Denmark) •
Doc. Dr. Henry Lasota (Technical University of Gdansk, Poland) •
Dr. habil. Hans U. Lass (Baltic Sea Research Institute Warnemünde, Rostock, Germany) •
Dr. Adam Latala (University of Gdansk, Poland) •
Prof. Erkki Leppäkoski (Environmental and Marine Biology, Åbo Akademi University, Finland) •
Dr. Iosif M. Levin (P. P. Shirshov Institute of Oceanology RAS, St. Petersburg Branch, Russia) •
Dr. Hanna Mazur-Marzec (University of Gdansk, Poland) •
Prof. Stanislaw Massel (Institute of Oceanology PAS, Sopot, Poland) •
Prof. Anton McLachlan (College of Science, Sultan Qaboos University, Oman) •
Prof. Geoffrey E. Millward (Dept. of Environmental Sciences, University of Plymouth, United Kingdom) •
Prof. Stanislaw Musielak(University of Szczecin, Poland) •
Prof. Dietwart Nehring (Baltic Sea Research Institute Warnemünde, Rostock, Germany) •
Ph. D. Christian Neusüß (Institute for Tropospheric Research, Leipzig, Germany) •
Prof. Stanislaw Niewolak (University of Warmia and Mazury, Olsztyn, Poland) •
Doc. Dr. Jan Parafiniuk (University of Warsaw, Poland) •
Dr. Gunnar Pedersen (Akvaplan-niva Polar Environmental Center, Tromso, Norway) •
Prof. Janusz Pempkowiak (Institute of Oceanology PAS, Sopot, Poland) •
Doc. Dr. Sergey I. Pogosyan (Dept. of Biophysics, Lomonosov' Moscow State University, Russia) •
Assoc. Prof. Gorzyslaw Poleszczuk (University of Szczecin, Poland) •
Prof. Mikolaj Protasowicki (Agricultural University of Szczecin, Poland) •
Prof. Zbigniew Pruszak (Institute of Hydro-Engineering PAS, Gdansk, Poland) •
Dr. Teresa Radziejewska (Agricultural University of Szczecin, Poland) •
Prof. Philip S. Rainbow (The Natural History M se m, London, United Kingdom) •
Prof. Henry Renk (Sea Fisheries Institute, Gdynia, Poland) •
Prof. Andrey Rubin (Dept. of Biophysics, Lomonosov' Moscow State University, Russia) •
Alexander P. Ryzhikh, Minor Scientific Researcher (Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia) •
Dr. Bernd Schneider (Baltic Sea Research Institute Warnemünde, Rostock, Germany) •
Dr. Andrzej Stolyhwo (Technical University of Gdansk, Poland) •
Prof. Ewa Styczynska-Jurewicz (Marine Biology Centre PAS, Gdynia, Poland) •
Prof. Antoni Sliwinski (University of Gdansk, Poland) •
Prof. Piotr Szefer (Medical University of Gdansk, Poland) •
Prof. John Wahr (Dept. of Physics, University of Colorado at Boulder, USA) •
Dr. Teresa Weglenska (Institute of Ecology PAS, Lomianki, Dziekanow Lesny, Poland) •
Prof. Jan Marcin Weslawski (Institute of Oceanology PAS, Sopot, Poland) •
Prof. Aleksander Winnicki (Agricultural University of Szczecin, Poland) •
Assoc. Prof. Zbigniew Witek (Sea Fisheries Institute, Gdynia, Poland) •
Prof. Maciej Wolowicz (University of Gdansk, Poland) •
Dr. Maren Voss (Baltic Sea Research Institute Warnemünde, Rostock, Germany) •
Assoc. Prof. Bogdan Wozniak (Institute of Oceanology PAS, Sopot, Poland) •
Prof. Andrzej Zielinski (Institute of Oceanology PAS, Sopot, Poland)
The following reviewers' names are printed with their kind permission:
The Baltic Sea - an example of how to protect marine coastal ecosystems
Oceanologia 2001, no 43 (1), pp. 5-22
Dietwart Nehring
Baltic Sea Research Institute Warnemünde, Seestrasse 15, 18112, Germany;
Keywords: Baltic Sea, enviromental load, ecosystem protection
Manuscript received 20 November 2000, accepted 7 December 2000.
The Baltic Sea covers an area of 415 000 km2. A typical brackish sea, it is very
sensitive to anthropogenic activities. Inorganic nutrients, trace metals, chlorinated
hydrocarbons and crude oil products are contaminants studied in the Baltic
Monitoring Programme of HELCOM. The data collected by the riparian countries
forms the basis for the periodic assessments of the state of the marine environment
of the Baltic Sea Area produced by HELCOM every five years. Since 1992 marine
nature conservation has been part of the HELCOM convention.
According to the third status report issued in 1996, it was the first time
that HELCOM could strike a positive balance with regard to the decreasing
environmental load. This is also reflected in lower concentrations of harmful
substances in fish, marine mammals and seabirds in the Baltic Sea Area. The
reasons for this progress are the protective actions initiated by HELCOM and the
economic collapse in some of the former East Bloc countries, the latter resulting in
an abrupt fall in industrial and agricultural production. Although the restoration
of the Baltic ecosystem has only just begun, the protective measures introduced to
achieve this aim can serve as an example of how to solve similar problems in other
semi-enclosed basins and shelf seas.
Selected ionic components of the marine aerosol over the Gulf of Gdansk
Oceanologia 2001, no 43 (1), pp. 23-37
Anita Nadstazik, Lucyna Falkowska
Institute of Oceanography, University of Gdansk,
al. Marszalka Pilsudskiego 46, PL-81-378 Gdynia, Poland;
nadsta@sat.ocean.univ.gda.pl
lucy@ocean.univ.gda.pl
Keywords: origin of aerosols, nitrate, macroelements, chloride losses
Manuscript received 1 December 2000, reviewed 25 January 2001, accepted 1 February 2001.
Aerosol samples were collected in May 1997 at a routine off-shore measurement
station in the Gdansk Deep region and at Hel, the latter being a coastal
station situated at the tip of the Hel Peninsula. Concentrations of NO3–,
Cl–, Na+, Mg2+, K+
and Ca2+ were measured simultaneously at both stations.
The sea influences the chemical composition of aerosols in the coastal zone of
the Gulf of Gdansk regardless of season, time of day or direction of advection.
Sodium chloride was always present in aerosols in the form of large particles
originating from seawater. Besides the marine chloride and nitrate, additional
amounts of these ions could have been of terrigenous origin. Sodium and
chloride concentrations were dominant in the total mass of aerosols at both
stations; however, these concentrations were three times higher at the marine
station. Similarly, the concentrations of ions originating from seawater, like
magnesium and calcium, were, on average, three times higher at the marine station.
The chemical composition of aerosols and air over the Gulf of Gdansk was
modified through the evaporation of chloride from the marine salt particles in
reactions with gaseous nitric and sulphuric acids. A certain deficit of chloride
versus sodium ions was noted. At the marine station the Cl–/Na+ ratio
reached 0.89 ± 0.2, on average, while over the land station it was 0.93 ± 0.25, i.e. lower than the seawater standard.
Spectral light absorption by yellow substance in the Kattegat-Skagerrak area
Oceanologia 2001, no 43 (1), pp. 39-60
Niels K. Højerslev
Niels Bohr Institute of Astronomy,
Physics and Geophysics,
University of Copenhagen,
Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark;
nkh@gfy.ku.uk
Eyvind Aas
Department of Geophysics,
University of Oslo,
POB 1022 Blindern, N-0315 Oslo, Norway;
eyvindaas@geofysikk.uio.no
Keywords: yellow substance, optical properties, absorption coefficient, spectral slope, Skagerrak, Kattegat, Baltic, scandinavian fjords
Manuscript received 28 December 2000, reviewed 22 January 2001, accepted 26 January 2001.
More than 1500 water samples were taken from the Kattegat, the Skagerrak and adjacent waters. The value of the absorption coefficient of yellow substance at 310 nm was found to vary from 0.06 to 7.4 m-1 in the open coastal waters, with a mean value of 1.3 m-1. The corresponding wavelength-averaged value (250-450 nm) of the semilogarithmic spectral slope of the coefficient ranges from 0.008 to 0.042 nm-1, and the mean value is 0.023 nm-1. Closer to river discharges, as in the fjords, the values of the slope seem to be more constant at around 0.0175 ± 0.0015 nm-1. In this area the slope must then be known in order to compare absorption at different wavelengths or to model the yellow substance absorption.
Run-up of dispersive and breaking waves on beaches
Oceanologia 2001, no 43 (1), pp. 61-97
Stanislaw R. Massel
Institute of Oceanology,
Polish Academy of Sciences,
Powstancow Warszawy 55, PL-81-712 Sopot, Poland;
smas@iopan.gda.pl
Efim N. Pelinovsky
Institute of Applied Physics,
Russian Academy of Sciences,
Ulyanov 46, RU-603600 Nizhniy Novgorod, Russia;
enpeli@appl.nnov.su
Keywords: surface waves, run-up process, sandy beaches, filtration, mathematical modelling
Manuscript received 18 December 2000, reviewed 8 February 2001, accepted 12 February 2001.
Transformation of waves on sandy beaches, their breaking, set-up and run-up are
the main factors contributing to fluctuations in the water table and groundwater
flow. In this paper, the run-up mechanisms have been studied using analytical
models. In contrast to the standard models, the waves approaching the shoreline
are assumed to be dispersive and the equivalence of the non-linear and linear
solutions for the extreme characteristics of wave run-up, such as the height of
maximum run-up and the velocity of run-up, are used.
A linear system of equations for the run-up of breaking waves is developed.
This system is based on the application of the mild-slope equation in the
deeper area, where waves are dispersive, while the linear equations of shallow
water are applied close to the shoreline, where the water depth is a linear
function of distance. The dissipation factor in the shallow water equation has
been formulated using its resemblance to the mild-slope equation for a
non-permeable sea bottom. Application of the method is illustrated for various
bottom profiles and wave characteristics, and theoretical results compared well
with experimental data. These solutions of the run-up phenomena will assist
future studies on wave-induced beach groundwater flow.
Lunar nodal tide in the Baltic Sea
Oceanologia 2001, no 43 (1), pp. 99-112
Andrzej Wroblewski
Institute of Oceanology,
Polish Academy of Sciences,
Powstancow Warszawy 55, PL-81-712 Sopot, Poland;
wroblew@iopan.gda.pl
Keywords: sea level, nodal tide, atmospheric pressure, wind
Manuscript received 15 November 2000, reviewed 9 January 2001, accepted 12 February 2001.
The nodal tide in the Baltic Sea was studied on the basis of the Stockholm tide-gauge readings for 1825-1984; data from the tide gauge at Swinoujscie for the same period provided comparative material. The Stockholm readings are highly accurate and are considered representative of sea levels in the whole Baltic; hence, the final computations were performed for the readings from this particular tide gauge for the period 1888-1980. The tidal amplitude obtained from measurements uncorrected for atmospheric pressure or wind field was compared with that forced only by atmospheric effects. The amplitude of the recorded nodal tide was the same as the equilibrium tide amplitude calculated for Stockholm. Calculations for equilibrium tide amplitudes were also performed for the extreme latitudes of the Baltic basin.
Seasonal variability of benthic ammonium release in the surface sediments of the Gulf of Gdansk (southern Baltic Sea)
Oceanologia 2001, no 43 (1), pp. 113-136
Dorota Maksymowska-Brossard
CREMA-L'Houmeau,
Centre de Recherche en Ecologie Marine et Aquaculturé,
UMR 10 CNRS-IFREMER,
B. P. 5, 17-137 L'Houmeau, France;
doni.brossard@infonie.fr
Halina Piekarek-Jankowska
Institute of Oceanography,
University of Gdansk,
al. Marszalka Pilsudskiego 46, PL-81-378, Gdynia, Poland;
Halina.Jankowska@ocean.univ.gda.pl
Keywords:ammonium, benthic fluxes, Eh, sediments, southern Baltic Sea
Manuscript received 29 September 2000, reviewed 9 November 2000, accepted 24 January 2001.
This paper describes the seasonal and spatial variations of diffusive sediment- water ammonium fluxes in the western part of the Gulf of Gdansk (southern Baltic). It assesses the potential environmental controls of these fluxes, such as the inflow of organic matter to bottom sediments and its quality, temperature-induced degradation of organic matter, and the redox potential of sediments. Ammonium fluxes, calculated using Fick's first law, were always in the direction from the sediment into the water column and differed significantly with respect to sediment type. Fluxes were most intensive in sediments with the highest silt-clay fraction located in the deepest parts of the study area. The mean annual diffusive fluxes of ammonium from sediments to near-bottom water were estimated at 5.24 tonnes km-2 year-1 for silty-clays, 1.85 tonnes km-2 year-1 for silty-sands and 1.03 tonnes km-2 year-1 for sandy sediments. There was a high seasonal variation, with the greatest ammonium release in summer and early autumn, when the temperature of near-bottom water was the highest. On the basis of the calculated diffusive ammonium fluxes, we estimated that approximately 2700 tonnes of N-NH4+ are released annually from the surface sediments of the western part of the Gulf of Gdansk, providing a minimum of 10% of the mineral nitrogen essential for primary production in surface waters. Our results are undoubtedly underestimated, as we disregarded advective ammonium fluxes, which in some areas of the Gulf of Gdansk could well be comparable to diffusive fluxes.