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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of landfast ice on the hydrography and circulation of the Baltic Sea coastal zone
    Autorzy:
    Merkouriadi, I.
    Lepparanta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49047.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Finland Gulf
    hydrography
    landfast ice
    circulation
    Baltic Sea
    coastal zone
    water temperature
    salinity
    current
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    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.
    Powiązania:
    https://bibliotekanauki.pl/articles/47626.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea ice
    hydrography
    physical oceanography
    European shelf sea
    Baltic Sea
    wave
    circulation
    Finland Gulf
    marine optics
    sea level
    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.
    Źródło:
    Oceanologia; 2008, 50, 3; 287-362
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partitioning of solar radiation in Arctic sea ice during melt season
    Autorzy:
    Lu, P.
    Cheng, B.
    Lepparanta, M.
    Li, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/48057.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    solar radiation
    partitioning
    Arctic Sea
    sea ice
    melt season
    solar energy
    energy absorption
    mass balance
    spectral irradiance
    numerical modelling
    Źródło:
    Oceanologia; 2018, 60, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of light transfer through drift ice and landfast ice in the Northern Baltic Sea
    Autorzy:
    Kari, E.
    Jutila, A.
    Friedrichs, A.
    Lepparanta, M.
    Kratzer, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079188.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    light transfer
    measurement
    sea ice
    landfast ice
    coloured dissolved organic matter
    Baltic Sea
    Opis:
    The aim of this study was to investigate the light transfer through sea ice with a focus on bio-optical substances both in fast ice and in the drift ice zones in the northern Baltic Sea. The measurements included snow and ice structure, spectral irradiance and photosynthetically active radiation below the sea ice. We also measured the concentrations of the three main bio-optical substances which are chlorophyll-a, suspended particulate matter, and coloured dissolved organic matter (CDOM). These bio-optical substances were determined for melted ice samples and for the underlying sea water. The present study provides the first spectral light transfer data set for drift ice in the Baltic Sea. We found high CDOM absorption values typical to the Baltic Sea waters also within sea ice. Our results showed that the transmittance through bare ice was lower for the coastal fast ice than for the drift ice sites. Bio-optical substances, in particular CDOM, modified the spectral distribution of light penetrating through the ice cover. Differences in crystal structure and the amount of gas inclusions in the ice caused variation in the light transfer. Snow cover on ice was found to be the dominant factor influencing the light field under ice, confirming previous studies. In conclusion, snow cover dominated the amount of light under the ice, but did not modify its spectral composition. CDOM in the ice absorbs strongly in the short wavelengths. As pure water absorbs most in the long wavelengths, the light transfer through ice was highest in the green (549–585 nm).
    Źródło:
    Oceanologia; 2020, 62, 3; 347-363
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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