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    Wyświetlanie 1-4 z 4
    Tytuł:
    Oceanographic observations in the Nordic Sea and Fram Strait in 2016 under the IO PAN long-term monitoring program AREX
    Autorzy:
    Walczowski, W.
    Beszczynska-Moller, A.
    Wieczorek, P.
    Merchel, M.
    Grynczel, A.
    Tematy:
    Nordic Sea
    Fram Strait
    spatial distribution
    salinity
    water temperature
    Atlantic water
    physical oceanography
    monitoring programme
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/48885.pdf  Link otwiera się w nowym oknie
    Opis:
    Since 1987 annual summer cruises to the Nordic Seas and Fram Strait have been conducted by the IO PAN research vessel Oceania under the long-term monitoring program AREX. Here we present a short description of measurements and preliminary results obtained during the open ocean part of the AREX 2016 cruise. Spatial distributions of Atlantic water temperature and salinity in 2016 are similar to their long-term mean fields except for warmer recirculation of Atlantic water in the northern Fram Strait. The longest observation record from the section N along 768300N reveals a steady increase of Atlantic water salinity, while temperature trend depends strongly on parametrization used to define the Atlantic water layer. However spatially averaged temperature at different depths indicate an increase of Atlantic water temperature in the whole layer from the surface down to 1000 m.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modelling of an oil spill in the Northern Adriatic
    Autorzy:
    Loncar, G.
    Leder, N.
    Paladin, M.
    Tematy:
    oil spill
    oil pollution
    emulsification
    numerical modelling
    Northern Adriatic
    sea surface
    temperature
    salinity
    physical oceanography
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/48197.pdf  Link otwiera się w nowym oknie
    Opis:
    Hypothetical cases of oil spills, caused by ship failure in the northern Adriatic, are analysed with the aim of producing three-dimensional models of sea circulation and oil contaminant transport. Sea surface elevations, sea temperature and salinity fields are applied as a forcing argument on the model’s open boundaries. The Aladin-HR model with a spatial resolution of 8 km and a time interval of 3 hours is used for atmospheric forcing. River discharges along the coastline in question are introduced as point source terms and are assumed to have zero salinity at their respective locations. The results of the numerical modelling of physical oceanography parameters are validated by measurements carried out in the ‘Adriatic Sea monitoring programme’ in a series of current meter and CTD stations in the period from 1 January 2008 to 15 November 2008. The oil spill model uses the current field obtained from a circulation model. Besides the convective dispersive transport of oil pollution (Lagrangian model of discrete particles), the model takes into account a number of reactive processes such as emulsification, dissolution, evaporation and heat balance between the oil, sea and atmosphere. An actual event took place on 6 February 2008, when the ship ‘Und Adriyatik’ caught fire in the vicinity of the town of Rovinj (Croatia) en route from Istanbul (Turkey) to Trieste (Italy). At the time the fire broke out, the ship was carrying around 800 tons of oil. Thanks to the rapid intervention of the fire department, the fire was extinguished during the following 12 hours, preventing possible catastrophic environmental consequences. Based on this occurrence, five hypothetical scenarios of ship failure with a consequent spill of 800 tons of oil over 12 hours were analysed. The main distinction between the simulated scenarios is the time of the start of the oil spill, corresponding to the times when stronger winds were blowing (>7 m s−1) with a minimum duration of 24 h within the timeframe. Each scenario includes a simulation of oil transport for a period of two months after the beginning of the oil spill. The results show that the coastal belt between the towns of Poreˇc and Rovinj is seriously exposed to an oil pollution load, especially a few days after a strong and persistent bora (NE wind).
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The progress in knowledge of physical oceanography of the Gulf of Finland: e review for 1997-2007
    Autorzy:
    Soomere, T.
    Myrberg, K.
    Lepparanta, M.
    Nekrasov, A.
    Tematy:
    sea ice
    hydrography
    physical oceanography
    European shelf sea
    Baltic Sea
    wave
    circulation
    Finland Gulf
    marine optics
    sea level
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/47626.pdf  Link otwiera się w nowym oknie
    Opis:
    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.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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