Wyniki wyszukiwania

1

The Vistula headwaters

100%

Punzet J.

Studia Naturae

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1998

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tom 44

9-17

2

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Investigating the role of air-sea forcing on the variability of hydrography, circulation, and mixed layer depth in the Arabian Sea and Bay of Bengal

100%

Srivastava A., Dwivedi S., Mishra A. K.

Oceanologia

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2018

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tom 60

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nr 2

3

Spatial variability of recent sedimentation rates in the Eastern Gotland Basin (Baltic Sea)

100%

Hille S., Leipe T., Seifert T.

Oceanologia

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2006

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tom 48

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nr 2

In order to study recent sedimentation rates in the Eastern Gotland Basin, 52 short sediment cores collected from the deepest part (<150 m)of the Basin in 2003 were investigated. The upper parts of all the cores were distinctly laminated and dark in colour, followed by a homogeneous, greyish lower part. The thickness of the laminated sequences varied from 17 to 300 mm. 210Pb dating analyses of selected cores revealed that the change from non-laminated to laminated sediments happened about 100 years ago, indicating a shift from predominantly oxic bottom water conditions to anoxic conditions. Used as a time marker, this shift in the sediment texture enabled sediment accumulation rates to be estimated for all sediment cores. The observed mean linear sedimentation rate for the whole basin was 0.93 ± 0.67 mm yr−1. The respective bulk sediment accumulation rates ranged from 10.5 to 527 g m−2 yr−1 with an average of 129 ± 112 g m−2 yr−1, indicating a high spatial variability of sedimentation rates within the basin. This agrees very well with the long-term sedimentation pattern since the Litorina transgression. The observed pattern clearly reflects the hydrographic conditions at the seafloor as studied by modelled near-bottom current velocities.

4

Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea

100%

Hagen E., Feistel R.

Oceanologia

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2007

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tom 49

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nr 2

Hydrographic and current measurements are analysed for stagnant deep-water conditions over the south-eastern topographic flank of the Eastern Gotland Basin (EGB) in April 2000. Results suggest a prevailing barotropic motion mode on a synoptic scale of several days. Deep along-slope volume transports derived from subsurface current meter moorings are compared with those of the baroclinic fraction of geostrophic motions crossing the plane of a hydrographic section. This was aligned perpendicular to deep isobaths and was repeated 40 times with a time step of six hours. Changes in regional winds produced a quasi-ten day cycle in the filling level of the Baltic Proper. Associated wave-like fluctuations of the mass field propagated cyclonically with a velocity of about 0.04 m s−1 around the deep basin’s rim. It is concluded that associated changes in deep volume transports result mainly from barotropically governed advection processes and that those of the baroclinic component of geostrophic currents provide a qualitatively and quantitatively quite inaccurate description of related transport fluctuations on a daily scale.

5

Observed variability in physical and biogeochemical parameters in the Central Arabian Gulf

84%

Rakib F., Al-Ansari E. M. A. S., Husrevoglu Y. S., Yigiterhan O., Al-Maslamani I., Aboobacker V. M., Vethamony P.

Oceanologia

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2021

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tom 63

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nr 2

6

Kongsfjorden and Hornsund hydrography - comparative study based on a multiyear survey in fjords of West Spitsbergen

84%

Prominska A., Cisek M., Walczowski W.

Oceanologia

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2017

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tom 59

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nr 4

A recent study has shown increased warming in the fjords of west Spitsbergen. Their location is critical, as they are situated along the main northward pathway of Atlantic Water (AW) which is a great source of heat to the Arctic Ocean and the fjords. In the light of ongoing warming, we aim to discuss differences between the fjords under northward transformation of oceanic waters. We compared summer hydrographic conditions in two fjords located in two opposite ends of west Spistbergen: Hornsund in the south and Kongsfjorden in the north. The study is based on high resolution CTD measurements collected during Arctic cruises between 2001 and 2015. The emphasis was put not only on differences in water temperature, salinity and water masses but also the freshwater content (FWC), AW transport and heat delivery to the fjords. In general, the water in Kongsfjorden is on average 18C warmer and its salinity is higher by 0.5 compared to Hornsund. It is also characterized by two times greater transport of AW and heat delivery to the fjord. On the other hand, Hornsund reveals two times higher FWC. Both fjords undergo a gradual warming due to an increased presence of Atlantic origin waters. The ongoing warming is accompanied by an increase in variability of temperature and salinity dependent on the domination of the Sørkapp Current (SC) or the West Spitsbergen Current (WSC) on the West Spitsbergen Shelf (WSS). Nonetheless, Hornsund remains more Arctic-type fjord compared to Kongsfjorden, due to stronger blocking by SC.

7

The progress in knowledge of physical oceanography of the Gulf of Finland: e review for 1997-2007

84%

Soomere T., Myrberg K., Lepparanta M., Nekrasov A.

Oceanologia

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2008

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tom 50

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nr 3

287-362

The main findings of studies of the physical oceanography of the Gulf of Finland (GoF) during 1997–2007 are reviewed. The aim is to discuss relevant updates published in international peer-reviewed research papers and monographs, bearing in mind that a comprehensive overview of the studies up to the mid-1990s is available (Alenius et al. 1998). We start the discussion with updates on the basic hydrographical and stratification conditions, and progress in the understanding of atmospheric forcing and air-sea interaction. Advances in the knowledge of basinscale and mesoscale dynamics are summarised next. Progress in circulation and water exchange dynamics has been achieved mostly by means of numerical studies. While the basic properties of circulation patterns in the gulf have been known for a century, new characteristics and tools such as water age, renewal index, and high-resolution simulations have substantially enriched our knowledge of processes in the Gulf of Finland during the last decade. We present the first overview of both status and advances in optical studies in this area. Awareness in this discipline has been significantly improved as a result of in situ measurements. Our understanding of the short- and long-term behaviour of the sea level as well as knowledge of the properties of both naturally and anthropogenically induced surface waves have expanded considerably during these ten years. Developments in understanding the ice conditions of the Gulf of Finland complete the overview, together with a short discussion of the gulf’s future, including the response to climate change. Suggestions for future work are outlined.

8

Influence of landfast ice on the hydrography and circulation of the Baltic Sea coastal zone

84%

Merkouriadi I., Lepparanta M.

Oceanologia

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2013

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tom 55

|

nr 1

9

Evidence for a warm water inflow into the Baltic Proper in summer 2003

84%

Feistel R., Nausch G., Heene T., Piechura J., Hagen E.

Oceanologia

|

2004

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tom 46

|

nr 4

The exceptional warm water inflow into the Baltic Sea in summer 2002, which preceded the major Baltic inflow of January 2003, was surprisingly repeated in modified form in summer 2003. Its warm waters even replaced the renewed, cold inflow waters in the eastern Gotland Basin and commenced another warm period in its deep layers, where the previous one had lasted from 1997 to 2003. Details of the temporal and spatial behaviour of this new baroclinic inflow are presented from various measurements carried out from the Kiel Bight up to Gotland, covering the Darss Sill, the Arkona, Bornholm, Gdańsk Basins and the Słupsk Channel, focused mainly on the time period between July 2003 and July 2004. Hypothetically, the repetition of these exceptional warm inflow events could be regarded as a possible regional indicator for global climatic change.

10

Warm waters of summer 2002 in the deep Baltic Proper

84%

Feistel R., Nausch G., Mohrholz V., Lysiak-Pastuszak E., Seifert T., Matthaus W., Kruger S., Hansen I. S.

Oceanologia

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2003

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tom 45

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nr 4

From October 2002 until March 2003 surprisingly warm, oxygenated waters were frequently encountered in the Baltic Sea in the area between the Bornholm and Fårö Deeps from the halocline down to the bottom. Owing to their ventilation effect in the stagnating deep waters, their occasional observations have partly been incorrectly attributed to the inflow events of October 2002 or January 2003. The emergence of some of these waters can be traced back to the exceptional summer weather conditions in August and September 2002 in central Europe. The warm waters played a remarkable renewal pacemaker role for the subsequent important winter inflow of January 2003. The evolution of this summer inflow is described and possible causes are discussed.

11

Plant communities of Uzhansky National Park [Ukrainian part of International Biosphere Reserve 'Eastern Carpathians']

84%

Hadac E., Stoyko S.

Roczniki Bieszczadzkie

|

1999

|

tom 08

12

Vertical distribution of zooplankton in the epipelagic zone off Sharm El-Sheikh, Red Sea, Egypt

67%

Dorgham M. M., Elsherbiny M. M., Hanafi M. H.

Oceanologia

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2012

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tom 54

|

nr 3

The purpose of the present study was to track the seasonal vertical distribution of zooplankton abundance in the epipelagic zone off Sharm El-Sheikh, Red Sea. Zooplankton samples were collected seasonally within the depth ranges of 0–25, 25–50, 50–75, 75–100 m at a single station off Sharm El-Sheikh City. The present study is an attempt to expand knowledge about the structure as well as the vertical distribution of the epipelagic zooplankton community in the Gulf of Aqaba in general and in its southern part in particular. The results indicate the occurrence of 52 copepod species and several species of other planktonic groups in the study area; the zooplankton standing crop fluctuated between 1124 and 4952 organisms m−3. Copepods appeared to be the predominant component, forming an average of 86.5% of the total zooplankton count, and with other groups demonstrated a markedly different seasonal vertical distribution. Twelve bathypelagic copepod species were reported during the present study, and five species were new to the area, having migrated northwards from the main basin of the Red Sea.

13

Composition of Trichiuridae and Gempylidae larvae [Teleostei] and their association with water masses in the Southwest Atlantic Ocean

67%

Junior P. M., De Souza C. S., Weiss G.

Oceanological and Hydrobiological Studies

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2009

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tom 38

|

nr 4

3-20

14

Natural and man-induced hazards along the Danube, between Rast and Gighera settlements, with a special view on the 2006 flood

67%

Licurici M., Boengiu S., Ionus O.

Quaestiones Geographicae

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2011

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tom 30

|

nr 1

15

Environmental changes in the central Baltic Sea during the past 1000 years: inferences from sedimentary records, hydrography and climate

67%

Leipe T., Dippner J. W., Hille S., Voss M., Christiansen C., Bartholdy J.

Oceanologia

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2008

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tom 50

|

nr 1

23-41

Short sediment cores from the eastern Gotland Basin were investigated using a multi-proxy approach in order to reconstruct the environmental conditions of the area during the past 1000 years. Sediment data and facies were discussed in relation to hydrographic features (salinity, oxygen) and climate change. During the medieval warm period (MWP), from about 900 to 1250 AD, the hydrographic and environmental conditions were similar to those of the present time (modern warm period, since about 1850): a temporally stable halocline, caused by regular saline water inflows from the North Sea, prevents vertical mixing and leads to bottom water anoxia and the deposition of laminated, organic-rich sapropels. During the period from about 1250 to 1850, referred to as the cold phase (including the Little Ice Age), the environmental conditions of the central Baltic Sea were distinctly different: the lower salinity, resulting from reduced North Sea water inflows, allowed vertical convection of the water column and long-term stable ventilation of the sea bed (oxic stage). Both the productivity of the planktonic ecosystem as well as the preservation of organic matter in the sediments improved during the warm periods. The anthropogenic impact can be identified within the recent laminated sequence by a temporal reconstruction of pollutant deposition. Our findings imply a climate-change driven shift in the environmental conditions and the ecosystem of the Baltic from the north to the south and back to the north.

16

Tworzenie numerycznego modelu dna zbiornika wodnego w oparciu o jednowiazkowy sondaz hydroakustyczny i system DGPS

67%

Templin T., Popielarczyk D.

Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum

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2008

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tom 07

|

nr 3

3-13

17

Hydrologia pojezierza antropogenicznego w rejonie Łęknicy (południowo-zachodnia Polska)

67%

Kolodziejczyk U., Asani A.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2012

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tom 11

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nr 2

Wskutek eksploatacji złóż węgla brunatnego w rejonie Łęknicy (południowo-zachodnia Polska) prowadzonej do 1974 r. wykształciło się charakterystyczne pojezierze antropogeniczne złożone z ponad 100 zbiorników wodnych. W artykule przedstawiono wyniki badań bilansu hydrologicznego wybranych zbiorników tego pojezierza. Celem przeprowadzonych badań była analiza składowych bilansu i ocena ich roli w kształtowaniu poszczególnych elementów zlewni oraz rekultywacji terenów poeksploatacyjnych. W pracy wykazano, że roczny bilans zlewni zbiorników odpływowych analizowanego pojezierza antropogenicznego w Łęknicy wykazuje retencję ujemną (–14,14 mm), natomiast zbiorników bezodpływowych – retencję dodatnią (+276,90 mm). Ogółem stwierdzono umiarkowanie ujemny bilans wodny tego pojezierza, co wskazuje na możliwość rekultywacji poszczególnych zbiorników, jednak w ograniczonym zakresie.

18

Zooplankton structure in high latitude fjords with contrasting oceanography (Hornsund and Kongsfjorden, Spitsbergen)

67%

Ormanczyk M. R., Gluchowska M., Olszewska A., Kwasniewski S.

Oceanologia

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2017

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tom 59

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nr 4

Zooplankton inhabiting the Hornsund and Kongsfjorden fjords on Spitsbergen (Svalbard) were investigated in summer 2013. The goal of the study was to determine how the zooplankton communities vary in environments functioning under different oceanographic regimes. Sampling was conducted with nets of different mesh size and selectivity (56 μm WP-2, 180 μm MultiNet, and 1000 μm Tucker Trawl), which permitted comparing a wide size spectrum of zooplankton components. Species composition did not differ substantially between the fjords, but the zooplankton in Hornsund was almost two times less numerous, and it had lower biomass per unit volume. The highest abundance at both sites was in the smallest zooplankton size fraction found only in samples taken with 56 μm mesh WP-2 net. These comprised as much as 71% and 58% of the total zooplankton abundance in Hornsund and Kongsfjorden, respectively. The communities in both fjords had comparable contributions of Arctic and boreo-Arctic species biomass in the year of the study. However, the comparison of zooplankton characteristics over several years showed changes in abundance and biogeographic structure that corresponded with variations in the physical environments of the fjords. The results of the study permit predicting the possible effects of the increasing influence of Atlantic waters on zooplankton communities inhabiting Arctic marine pelagic ecosystems.

19

Interannual variability in the hydrophysical fields of the Norwegian-Barents Seas confluence zone

67%

Piechura J., Walczowski W.

Oceanologia

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1996

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tom 38

|

nr 1

20

Meiobenthic communities of the Pomeranian Bay [Southern Baltic]: effects of proximity to river discharge

67%

Rokicka-Praxmajer J., Radziejewska T., Dworczak H.

Oceanologia

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1998

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tom 40

|

nr 3

Ograniczanie wyników

The Vistula headwaters

Investigating the role of air-sea forcing on the variability of hydrography, circulation, and mixed layer depth in the Arabian Sea and Bay of Bengal

Spatial variability of recent sedimentation rates in the Eastern Gotland Basin (Baltic Sea)

Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea

Observed variability in physical and biogeochemical parameters in the Central Arabian Gulf

Kongsfjorden and Hornsund hydrography - comparative study based on a multiyear survey in fjords of West Spitsbergen

The progress in knowledge of physical oceanography of the Gulf of Finland: e review for 1997-2007

Influence of landfast ice on the hydrography and circulation of the Baltic Sea coastal zone

Evidence for a warm water inflow into the Baltic Proper in summer 2003

Warm waters of summer 2002 in the deep Baltic Proper

Plant communities of Uzhansky National Park [Ukrainian part of International Biosphere Reserve 'Eastern Carpathians']

Vertical distribution of zooplankton in the epipelagic zone off Sharm El-Sheikh, Red Sea, Egypt

Composition of Trichiuridae and Gempylidae larvae [Teleostei] and their association with water masses in the Southwest Atlantic Ocean

Natural and man-induced hazards along the Danube, between Rast and Gighera settlements, with a special view on the 2006 flood

Environmental changes in the central Baltic Sea during the past 1000 years: inferences from sedimentary records, hydrography and climate

Tworzenie numerycznego modelu dna zbiornika wodnego w oparciu o jednowiazkowy sondaz hydroakustyczny i system DGPS

Hydrologia pojezierza antropogenicznego w rejonie Łęknicy (południowo-zachodnia Polska)

Zooplankton structure in high latitude fjords with contrasting oceanography (Hornsund and Kongsfjorden, Spitsbergen)

Interannual variability in the hydrophysical fields of the Norwegian-Barents Seas confluence zone

Meiobenthic communities of the Pomeranian Bay [Southern Baltic]: effects of proximity to river discharge