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    Wyświetlanie 1-13 z 13
    Tytuł:
    Numeryczne wyznaczenie współczynników masy wody towarzyszącej okrętu podwodnego
    Numerical determination of mass ratios of water accompanying submarine
    Autorzy:
    Pawlędzio, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/222458.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    okręt podwodny
    masa wody
    hydrodynamika
    submarine
    water mass
    hydrodynamics
    Opis:
    W pracy przedstawiono wyniki obliczeń numerycznych współczynników mas wody towarzyszącej okrętu podwodnego w zależności od jego zanurzenia. Obliczenia przeprowadzono dla obiektu znajdującego się w określonej odległości od powierzchni akwenu. W rezultacie otrzymano przebiegi zmian współczynników mas wody towarzyszącej w zależności od zanurzenia. Współczynniki określano na podstawie pola potencjału wyznaczanego metodą elementów brzegowych. Wyniki otrzymane za pomocą metody numerycznej zweryfikowano na przykładzie elipsoidy oraz porównano z wynikami badań eksperymentalnych [4].
    The paper presents the results of numerical calculations of hydrodynamic coefficients carried out with the boundary elements method for a submarine. The calculations were made for an object at some distance from the surface. As a result obtained were courses of coefficients of accompanying water masses, depending on the depth. The coefficients were calculated on the basis of field potential calculated with the edge element method. The results obtained with the numerical method were verified against an ellipsoid and compared with the results of the experimental investigations.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2005, R. 46 nr 2 (161), 2 (161); 115-124
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kongsfjorden and Hornsund hydrography - comparative study based on a multiyear survey in fjords of West Spitsbergen
    Autorzy:
    Prominska, A.
    Cisek, M.
    Walczowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/48487.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Kongsfjorden
    Hornsund
    hydrography
    Atlantic water
    transport
    water column
    water mass
    water temperature
    water salinity
    Opis:
    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.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inflow of Atlantic-origin waters to the Barents Sea along glacial troughs
    Autorzy:
    Matishov, G.G.
    Matishov, D.G.
    Moiseev, D.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/47953.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    thermohaline
    bathymetry
    Atlantic-origin water
    Barents Sea
    water mass
    circulation
    climate
    glacial trough
    Opis:
    This paper discusses the role of glacial shelf topography in the formation of general oceanological and biological mechanisms in the Barents Sea. Analysis of geomorphological data and oceanographic observations obtained on board MMBI research vessels in 2001–08 has shown that: fluxes of Atlantic-origin waters pass along glacial troughs; the inflow of Atlantic waters to the Barents Sea from the west increased from 2001t ill 2007, although this advection began to weaken in 2008; vertical and horizontal thermohaline gradients intensified during the investigated period; a warm period similar to that of the 1930s was observed in the Barents Sea at the beginning of the 21st century.
    Źródło:
    Oceanologia; 2009, 51, 3; 321-340
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in Atlantic water characteristics in the South-Eastern Mediterranean Sea as a result of natural and anthropogenic activities
    Autorzy:
    Said, M.A.
    Gerges, M.A.
    Maiyza, I.A.
    Hussein, M.A.
    Radwan, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47724.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Atlantic water
    change
    Mediterranean Sea
    Egypt
    natural activity
    anthropogenic activity
    temperature
    salinity
    trend
    water mass
    subsurface water
    water column
    Źródło:
    Oceanologia; 2011, 53, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical oceanographic conditions and a sensitivity study on meltwater runoff in a West Greenland fjord: Kangerlussuaq
    Autorzy:
    Monteban, D.
    Pedersen, J.O.P.
    Nielsen, M.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079080.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    melt water
    hydrodynamic model
    numerical model
    seasonal variability
    physical condition
    water mass
    Arctic fjord
    West Greenland
    Kangerlussuaq
    Opis:
    In this paper, we discuss the first setup of a hydrodynamic model for the fjord-type estuary Kangerlussuaq, located in West Greenland. Having such a high-fidelity numerical model is important because it allows us to fill in the temporal and spatial gaps left by in situ data and it allows us to examine the response of the fjord to changes in ice sheet runoff. The numerical model is calibrated against in situ data, and a one-year simulation was performed to study the seasonal variability in the physical oceanographic environment and the fjord's response to changing meltwater runoff. The fjord consists of two distinct parts: a deep inner part that is 80 km long with weak currents and a shallow part that covers the outer 100 km of the fjord connected to the ocean. The outer part has very fast currents (∼1.3 m/s), which we suggest prevents winter sea ice formation. The dominant currents in the fjord are oriented parallel to the long axis of the fjord and are driven by tides and (during summer) freshwater inflow from meltwater-fed rivers. Furthermore, mixing processes are characterized by strong tidal mixing and bathymetric restrictions, and the deep-lying water mass is subject to renewal primarily in wintertime and is almost dynamically decoupled from the open ocean during summertime. Finally, a sensitivity study on the changing meltwater runoff was performed, showing that increasing freshwater runoff considerably strengthens stratification in the upper 100 m of the water column in the inner part of the fjord.
    Źródło:
    Oceanologia; 2020, 62, 4PA; 460-477
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the possibility of convective overturning in the Slupsk Furrow overflow of the Baltic Sea
    Autorzy:
    Zhurbas, V.
    Elken, J.
    Paka, V.
    Piechura, J.
    Chubarenko, I.
    Vali, G.
    Golenko, N.
    Shchuka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48298.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    deep water
    dense water
    density stratification
    gravity current
    numerical simulation
    saline water
    Slupsk Furrow
    transverse circulation
    water mass
    Opis:
    Closely spaced CTD transects across the Słupsk Furrow displayed a ‘downward- bending’ of salinity contours below the salinity interface on the southern flank due to a transverse circulation in the saline water overflow. Numerical simulation of a gravity current in an idealized channel with geometry, dimensions and initial density stratification all much the same as in the Słupsk Furrow was applied to verify whether the downward-bending could be transformed into an inverted density stratification. Some arguments in favour of the possibility of convective overturning due to the differential transverse advection beneath the gravity current, brought on by the numerical simulations, are discussed.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An overview of the teta - S correlations in Fram Strait based on the MIZEX 84 data
    Autorzy:
    Schlichtholz, P.
    Houssais, M.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/47520.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    temperature
    Fram Strait
    Atlantic water
    hydrographic cast
    MIZEX 84 experiment
    teta-S diagram
    water mass
    salinity
    Arctic Ocean
    Opis:
    The water masses in Fram Strait have been analyzed on the basis of hydrographic casts taken in summer 1984 during the MIZEX 84 experiment. In particular, θ − S diagrams for 16 areas, each 5◦ in longitude and 1◦ in latitude, covering the strait from 77◦N to 81◦ N are used to characterize the water masses and discuss their possible origin. Near the surface, the East Greenland Polar Front clearly separates the lighter, cold and fresh Polar Water (PW) from the heavier, warm and saline Atlantic Water (AW). In the upper ocean, the data show a large spreading of the temperature maximum in the θ − S space associated with different modes of the AW recirculating southward below the PW. Two geographically distinct salinity minima are found in the intermediate layer below the AW. The denser one, in the Boreas Basin, is a feature typical of the Arctic Intermediate Water (AIW) formed by winter convection to the south of the strait, while the lighter one is sandwiched in the Arctic Ocean outflow between the AW layer and the Upper Polar Deep Water (UPDW) characterized by a downward salinity increase. In the deep layer, two salinity maxima are present. The shallower (and warmer) one, associated with the Canadian Basin Deep Water (CBDW), appears all along the East Greenland Slope. A similar but weaker maximum is also found in the southeastern part of the strait. This maximum is perhaps a remnant of the maximum in the East Greenland Current after it has been recirculated back to the strait around the cyclonic gyres of the Nordic Seas. The deeper one appears typically as a near-bottom salinity jump characteristic of the Eurasian Basin Deep Water (EBDW). The jump is found in two distinct areas of the strait, to the north-west in the Lena Trough and to the south-east in the rift valley of the Knipovich Ridge. The maximum in the former area should have been advected from the Arctic Ocean below the CBDW, while the maximum in the latter area might have originated from haline convection on the adjacent shelves. Some EBDW is trapped in the Molloy Deep over a denser water with salinity decreasing down to the bottom and temperature in the range of the Greenland Sea Deep Water (GSDW).
    Źródło:
    Oceanologia; 2002, 44, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inherent optical properties and particulate matter distribution in summer season in waters of Hornsund and Kongsfjorden, Spitsbergen
    Autorzy:
    Sagan, S.
    Darecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49136.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    inherent optical property
    particulate matter
    vertical structure
    summer season
    Atlantic water
    Hornsund
    Kongsfjorden
    Spitsbergen
    hydrological regime
    water mass
    water column
    Opis:
    Two Spitsbergen fjords, Hornsund and Kongsfjorden, are known for being under different hydrological regimes. The first is cold, separated from warm Atlantic water by East Spitsbergen Current, while Kongsfjorden is frequently penetrated by relatively warm Atlantic water. On the other hand, both are under strong influence of water discharge from glaciers and land freshwater input. During the period of observation in both fjords a dominant water mass was Surface Water, which originates mainly from glacial melt. The presence of suspended matter introduced with melt water in Surface Water is reflected by highest values of light attenuation and absorption coefficients recorded in areas close to glacier both in Hornsund and Kongsfjorden. In Hornsund the maximum light attenuation coefficient cpg(555) was 5.817 m−1 and coefficient of light absorption by particles ap(676) = 0.10 m−1. In Kongsfjorden the corresponding values were 26.5 m−1 and 0.223 m−1. In Kongsfjorden suspended matter of the size class 20–200 μm dominated over fractions smaller than 20 μm while in Hornsund dominating size fraction was 2–20 μm. The results provide an evidence of considerable range of variability of the optical properties mainly due to glacial and riverine runoff. The scale of variability of particulate matter in Kongsfjorden is bigger than in Hornsund. Most of the variability in Hornsund can be attributed to glaciers discharge and a presence of particles of mineral origin, while in Kongsfjorden the organic and mineral particles contribute almost equally to defining the optical properties of water.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tracing the signature of various frontal systems in stable isotopes (oxygen and carbon) of the planktonic foraminiferal species Globigerina bulloides in the Southern Ocean (Indian Sector)
    Autorzy:
    Khare, N.
    Chaturvedi, S.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/48922.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Foraminifera
    Globigerina bulloides
    stable isotope
    frontal system
    oxygen
    carbon
    foraminiferal species
    water mass
    Southern Ocean
    Opis:
    Twenty-five surficial sediment samples, collected on board ORV Sagar Kanya during her 199th and 200th cruises along a north-south transect between latitudes 9.69◦N and 55.01◦S, and longitudes 80◦E and 40◦ E were studied for isotopic variations (values of δ18O and δ13C) of the indicator planktonic species Globigerina bulloides. The results indicate that from latitudes 9.69◦N to 15◦ S both these isotopes (δ18O and δ13C) fluctuated significantly. Between latitudes from around 15◦S to 30–35◦S δ18O values steadily increased, whereas δ13C showed a decreasing trend. However, to the south of latitudes 30–35◦S, both isotope values showed a similar response with a gradual increase up to latitude 50◦S, beyond which δ18O continued to increase while δ13C declined. The characteristic patterns of the values of both isotopes indicates that the signatures of different water masses are associated with various frontal systems and/or water masses across the transect. The signature of the Polar Front at around latitude 50◦S shows the specific response of the isotopic values (δ18O and δ13C) of G. bulloides. Such a response beyond 50◦S latitude is ascribable to the general decrease in the ambient temperature, resulting in a continuous increase in δ18O values, while δ13C values decrease as a result of reduced photosynthesis in regions approaching higher latitudes owing to low light penetration. To further corroborate our results, those of many such transects from geographically distinct regions need to be studied for isotopic variations in the calcareous shells of planktonic foraminiferal species. The results have the potential to be used as a proxy to assess the movement of frontal systems in southern high latitude regions.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meteorological influences on the surface hydrographic patterns of the North Aegean Sea
    Autorzy:
    Sylaios, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/48232.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water mass
    Baltic Sea
    Aegean Sea
    sea water
    hydrographic data
    wind stress
    bottom topography
    meteorological influence
    hydrographic pattern
    Anthos Peninsula
    salinity
    Opis:
    Hydrographic data from the North Aegean Sea were used to examine the summer variability of surface water masses during the period 1998–2001. Attention was placed on the surface hydrographic features of the area, such as the Black Sea Water (BSW) plume expansion, the frontal characteristics of the BSW with the Levantine Intermediate Water (LIW) and the variability of submesoscale hydrographic features (such as the Samothraki Anticyclone). Strong southerly wind stresses were found responsible for relaxing the horizontal density gradients across the BSW-LIW frontal zone and displacing this front to the north of Lemnos Island, thus suppressing the Samothraki Anticyclone towards the Thracian Sea continental shelf. Under northerly winds, the BSW-LIWfront returns to its regular position (south of Lemnos Island), thus allowing the horizontal expansion of the Samothraki gyre up to the Athos Peninsula. Present results indicate the importance of medium-term wind stress effects on the generation of Samothraki Anticyclone suppression/expansion events.
    Źródło:
    Oceanologia; 2011, 53, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synereza mleka kwaśnego i wpływ NaHCO3 na jej przebieg
    The syneresis of sour milk and the influence of NaHCO3 on its course
    Autorzy:
    Czajka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/872451.pdf
    Data publikacji:
    1956
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    mleko kwasne
    proby badawcze
    badania naukowe
    kwasowosc
    serwatka
    masa wody
    sour milk
    scientific research
    acidity
    whey
    water mass
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1956, 07, 1
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temporal and spatial changes in the bio-optical properties of seawater in the Nordic Seas – AREX’2003 and 2006
    Autorzy:
    Drozdowska, V.
    Paryvkina, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/47895.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Atlantic water
    bio-optical property
    chlorophyll
    fluorescence
    Nordic Sea
    ocean circulation
    organic matter
    oxygen
    phytoplankton
    sea water
    shelf water
    spatial change
    Svalbard Islands
    temporal change
    water mass
    Opis:
    For many years the Nordic Seas have been the subject of research into ocean circulation carried out by the Institute of Oceanology PAS, especially the inflow of Atlantic water and the intensive turbulent mixing of these waters with Arctic and shelf waters. Ocean currents affect various biological processes, among them the supply of organic matter and oxygen, which constitute the foundation for the unique flora and fauna of the Svalbard islands. Spectrophotometric examinations of surface waters using an M32 B spectroflu- orophotometer (LDI Ltd.) were carried out repeatedly during Arctic cruises on board r/v ‘Oceania’. The results presented in this paper come from the AREX campaigns of 2003 and 2006. Analysis of the chlorophyll a fluorescence excitation spectra recorded shows an increase in phytoplankton abundance and the changes in the spatial distribution of the phytoplankton species characteristic of Atlantic, Arctic and shelf waters. The spatial patterns of the phytoplankton pigments and their abundance were compared with the physical characteristics of water masses. The analysis confirmed that phytoplankton species move together with the Atlantic water as this flows into northern latitudes.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geostrophic current patterns off the Egyptian Mediterranean coast
    Autorzy:
    Kamel, M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48462.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    geostrophic current circulation
    hydrographic data
    Egyptian Mediterranean coast
    Salum Bay
    Egypt
    Nile Delta
    Port Said
    nearshore area
    water mass
    surface water
    salinity
    oxygen content
    Opis:
    Using objectively analysed hydrographic data, currents have been calculated off the Egyptian Mediterranean coast at the surface and at 30, 50, 75, 100, 200 and 300 m depths for the four seasons. The surface circulation is dominated by an anticyclonic circulation off Salum Bay in winter, spring and summer. In nearshore areas, the current flows eastwards at the shallower levels but westwards at the deeper levels. Off the Nile Delta, the current is almost eastward with a higher velocity in summer and autumn, while in spring it is very weak. Off the area between Port Said and Rafah, there is a clear cyclonic circulation appearing in all seasons except winter. At 50 and 75 m depth, the velocity of the circulation is weak. At 100 m depth, the circulation that appeared between Matruh and Alamen in summer decreases in area and magnitude at the former depths. At 200 and 300 m in winter, the current velocity is quite low. In spring the current flows southwards off the area between Rafah and Port Said. In summer, the current off the area between Port Said and Rafah is quite strong and flows to the south. The situation in autumn is quite similar to that in summer, except in the eastern area, where the current is a westward one.
    Źródło:
    Oceanologia; 2010, 52, 2; 299-310
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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