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    Wyświetlanie 1-14 z 14
    Tytuł:
    Influence of aerosol vertical profile variability on retrievals of aerosol optical thickness from NOAA AVHRR measurements in the Baltic region
    Autorzy:
    Rozwadowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47666.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    aerosol optical thickness
    climatological aerosol
    atmospheric aerosol
    Baltic region
    Opis:
    The expected influence of variability in atmospheric aerosol profiles on retrievals of aerosol optical thickness (AOT) from NOAA AVHRR measurements is analysed. In particular, the bias in the AOT retrieval due to the assumption of a climatological aerosol profile in the retrieval algorithm is studied. The bias is defined as the difference between AOT retrieved with an algorithm using a climatological aerosol profile, and the actual AOT employed in the calculations of radiances at the top of the atmosphere (TOA). The TOA radiances are simulated by means of the MODTRAN code for different aerosol profiles. Atmospheric conditions and solar and satellite angles used in the bias simulations are typical of the Baltic region. In the simulations, the maximum absolute value of the bias amounts to nearly 40% in channel 2 and 14% in channel 1 of AVHRR.
    Źródło:
    Oceanologia; 2007, 49, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observations of the aerosol particle number concentration in the marine boundary layer over the South-Eastern Baltic Sea
    Autorzy:
    Bycenkiene, S.
    Ulevicius, V.
    Prokopciuk, N.
    Jasineviciene, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/48185.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    principal component analysis
    aerosol number concentration
    wavelet transform
    coastal site
    marine boundary layer
    environment pollution
    Baltic region
    Źródło:
    Oceanologia; 2013, 55, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observational evidence for human impact on aerosol cloud-mediated processes in the Baltic region
    Autorzy:
    Kruger, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/48934.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    aerosol
    cloud
    human impact
    radiation
    sulphur dioxide
    sulphur emission
    nitrogen oxide emission
    ammonia emission
    atmospheric circulation
    solar radiation
    Baltic region
    Źródło:
    Oceanologia; 2014, 56, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality assessment of atmospheric surface fields over the Baltic Sea from an ensemble of regional climate model simulations with respect to ocean dynamics
    Autorzy:
    Meier, H.E.M.
    Hoglund, A.
    Doscher, R.
    Andersson, H.
    Loptien, U.
    Kjellstrom, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48250.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    atmosphere-ocean coupling
    Baltic region
    climate change
    climate model
    ecosystem
    global warming
    hydrographic change
    regional climate
    regional climate modelling
    sea ice
    temperature
    water temperature
    Opis:
    Climate model results for the Baltic Sea region from an ensemble of eight simulations using the Rossby Centre Atmosphere model version 3 (RCA3) driven with lateral boundary data from global climate models (GCMs) are compared with results from a downscaled ERA40 simulation and gridded observations from 1980 –2006. The results showed that data from RCA3 scenario simulations should not be used as forcing for Baltic Sea models in climate change impact studies because biases of the control climate significantly affect the simulated changes of future projections. For instance, biases of the sea ice cover in RCA3 in the present climate affect the sensitivity of the model’s response to changing climate due to the ice-albedo feedback. From the large ensemble of available RCA3 scenario simulations two GCMs with good performance in downscaling experiments during the control period 1980–2006 were selected. In this study, only the quality of atmospheric surface fields over the Baltic Sea was chosen as a selection criterion. For the greenhouse gas emission scenario A1B two transient simulations for 1961 –2100 driven by these two GCMs were performed using the regional, fully coupled atmosphere-ice-ocean model RCAO. It was shown that RCAO has the potential to improve the results in downscaling experiments driven by GCMs considerably, because sea surface temperatures and sea ice concentrations are calculated more realistically with RCAO than when RCA3 has been forced with surface boundary data from GCMs. For instance, the seasonal 2 m air temperature cycle is closer to observations in RCAO than in RCA3 downscaling simulations. However, the parameterizations of air-sea fluxes in RCAO need to be improved.
    Źródło:
    Oceanologia; 2011, 53, (1-TI)
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inflow waters in the deep regions of the Southern Baltic Sea - transport and transformations
    Autorzy:
    Piechura, J.
    Beszczynska-Moller, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47562.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    transport
    temperature
    deep region
    transformation
    Baltic Sea
    inflow water
    mixing
    Opis:
    A medium-sized inflow (about 200 km3 according to IOW data, - personal communication) of saline water into the southern Baltic Sea occurred during January 2003. Unlike any previously observed inflow, this one brought very cold water, of temperatures around 1-2oC and less. Since the temperature of the deep water in the southern Baltic before the inflow was exceptionally high (11-12oC), the inflowing waters produced dramatic changes and a steep temperature gradient. The movement of the inflowing waters through the deep basins and channels of the Baltic Sea from the Arkona Basin to the Gdańsk Deep during next 4-8 months is described. Frequent mesoscale structures and intensive mixing followed the eastward transport of the inflow water, particularly in the Bornholm Deep and Słupsk Furrow. The present paper is based on data collected during 6 cruises r/v "Oceania" between December 2002 and August 2003. The last cruise in August took place in order to assess the long-term consequences of the inflow.
    Źródło:
    Oceanologia; 2004, 46, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Winter upwelling in the Gulf of Finland, Baltic Sea
    Autorzy:
    Suursaar, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078916.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    upwelling
    winter
    nearshore region
    Finland Gulf
    Baltic Sea
    stratification
    vertical flux
    water temperature
    Opis:
    Traditionally, upwelling-related studies in the Baltic Sea have been limited to the period from May to September. Based on wintertime in situ measurements at two nearshore locations in the Gulf of Finland, clear evidence of winter “warm” upwelling events was detected and analysed. The process was very common. At a 10 m deep location, upwelling caused water temperature (T) to switch from 0—1 to 4—5°C and salinity (S) to switch from 4.5 to 6 PSU; at 20 m depth it caused a switch in T between 1 and 2—4°C and in S between 5.5 and 6.8 PSU. Differently from summer upwelling, T and S variations were positively correlated to each other. Salinity variations remained roughly the same throughout the winter, whereas T differences were higher in winter onset, then decreased to ca. 1°C, and increased again after the process reversed to summer-type upwelling in April—May. Based on analysis of SatBaltyk (January to March) sea surface temperature and salinity product imagery, winter upwelling occurrence along the North Estonian coast was 21—28% over 2010—2021, and slightly less along the Finnish coast. Regarding S variations, winter upwelling occurred with roughly similar frequencies and impacts in the northern and southern parts of the gulf. However, the impacts on T and sea ice conditions were highly asymmetrical. Upwelling kept the Estonian coast ice-free longer and water temperatures slightly higher than at the Finnish coast. Winter upwelling as a phenomenon has long been ignored and therefore probably underestimated.
    Źródło:
    Oceanologia; 2021, 63, 3; 359-369
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The killer shrimp Dikerogammarus villosus (Crustacea, Amphipoda) invades Lithuanian waters, South-Eastern Baltic Sea
    Autorzy:
    Sidagyte, E.
    Solovjova, S.
    Sniaukstaite, V.
    Siaulys, A.
    Olenin, S.
    Arbaciauskas, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/47579.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    shrimp
    alien species
    Dikerogammarus villosus
    Crustacea
    Amphipoda
    Lithuania
    Baltic Sea
    Ponto-Caspian region
    Opis:
    The killer shrimp Dikerogammarus villosus was recorded for the first time in Lithuanian waters in 2015. The species was detected in three sites in the Curonian Lagoon (on two buoys in the lagoon strait and the harbour, and one littoral sampling site) and in the mouth of the Šventoji River. The species presence in the buoy fouling suggests the involvement of shipping in species introduction. Most likely D. villosus has arrived to the Curonian Lagoon with commercial ships, while the invasion into the mouth of the Šventoji River may be associated with leisure shipping as the port situated therein is not currently functioning. Further northward expansion of the killer shrimp in the Baltic Sea basin seems very probable. As the species is highly aggressive, alterations of local macroinvertebrate assemblages can also be predicted.
    Źródło:
    Oceanologia; 2017, 59, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inflow waters in the deep regions of the Southern Baltic Sea - transport and transformations
    Autorzy:
    Piechura, J.
    Beszczynska-Moller, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48744.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    transport
    temperature
    hydrography
    deep region
    transformation
    environment
    salinity
    Baltic Sea
    ecosystem
    inflow water
    mixing
    Opis:
    A medium-sized inflow (about 200 km3 according to IOW data, – personal communication) of saline water into the southern Baltic Sea occurred during January 2003. Unlike any previously observed inflow, this one brought very cold water, of temperatures around 1–2◦C and less. Since the temperature of the deep water in the southern Baltic before the inflow was exceptionally high (11–12◦C), the inflowing waters produced dramatic changes and a steep temperature gradient. The movement of the inflowing waters through the deep basins and channels of the Baltic Sea from the Arkona Basin to the Gdańsk Deep during next 4–8 months is described. Frequent mesoscale structures and intensive mixing followed the eastward transport of the inflow water, particularly in the Bornholm Deep and Słupsk Furrow. The present paper is based on data collected during of 6 cruises r/v ‘Oceania’ between December 2002 and August 2003. The last cruise in August took place in order to assess the long-term consequences of the inflow.
    Źródło:
    Oceanologia; 2003, 45, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simple formula for the net long-wave radiation flux in the Southern Baltic Sea
    Autorzy:
    Zapadka, T.
    Wozniak, S.B.
    Wozniak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/47670.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    statistical error
    infrared radiation
    Batlic Region
    sea surface
    Baltic Sea
    long-wave radiation
    atmosphere
    Opis:
    This paper discusses problems of estimating the net long-wave radiation flux at the sea surface on the basis of easily measurable meteorological quantities (air and sea surface temperatures, near-surface water vapour pressure, cloudiness). Empirical data and existing formulae are compared. Additionally, an improved formula for the southern Baltic region is introduced, with a systematic error of less than 1 W m−2 and a statistical error of less than 20 W m−2.
    Źródło:
    Oceanologia; 2001, 43, 3; 265-277
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea surface temperature distribution during upwelling along the Polish Baltic coast
    Autorzy:
    Krezel, A.
    Ostrowski, M.
    Szymelfenig, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48583.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    advanced very high resolution radiometer
    temperature
    upwelling
    coastal upwelling
    coastal region
    sea surface
    Baltic Sea
    Opis:
    Among over 150 maps of sea surface temperature in the Polish Baltic coastal region derived from satellite data during the warm period of the year (April–October) in 2000–2002, 41 cases were noted where its distribution showed characteristic features indicating the occurrence of coastal upwelling. The fundamental parameters of range, probability of occurrence and temperature modification caused by water from deeper sea layers raised by an upwelling event and spreading across the surface were established for three regions (Hel, Łeba and Kołobrzeg). The Kołobrzeg upwelling region had the largest spatial range (up to 5000 km2). The region with the smallest spatial range (Hel, up to 1400 km2) had the largest surface temperature amplitude (to 14◦C), the largest maximum temperature gradient (5◦C km−1) and the largest average sea surface temperature decrease in the centre in relation to the background value.
    Źródło:
    Oceanologia; 2005, 47, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observations of new particle formation events in the South-Eastern Baltic Sea
    Autorzy:
    Plauskaite, K.
    Ulevicius, V.
    Spirkauskaite, N.
    Bycenkiene, S.
    Zielinski, T.
    Petelski, T.
    Ponczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48201.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    meteorological parameter
    chemical parameter
    solar radiation
    coastal region
    coastal site
    marine environment
    Mediterranean coastal zone
    Opis:
    New particle formation and growth were observed at a coastal site (Preila station, Lithuania) during 1997 and 2000–2002. The total amount of data analysed covers 291 one-day periods, 45 (15%) of which were long-term, new particle formation days. Short-term nucleation events (from a few minutes to one hour) and long-term events (from one to eight hours) were identified. The mean particle growth rate, condensation sink and condensable vapour source rate during nucleation events were 3.9 nm h−1, 1.45 × 10−3 cm−3 s−1 and 7.5 × 104 cm−3 s−1 respectively. The average formation rate J10 was 0.4 cm−3 s−1. The nucleation events were accompanied mainly by air masses transported from the north (43%) and north-west (19%). Meteorological parameters and trace gas (O3, SO2, NO2) concentrations were also analysed. It was found that nucleation events are related to high levels of solar radiation.
    Źródło:
    Oceanologia; 2010, 52, 1; 53-75
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea surface temperature retrieval from MSG-SEVIRI data in the Baltic Sea area
    Autorzy:
    Wozniak, M.
    Krezel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47694.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sea surface temperature
    Baltic Sea
    algorithm
    mid-latitude region
    spatial resolution
    regression analysis
    surface temperature
    marine environment
    climate change
    Opis:
    The aim of the paper was to confirm the proposition that the classical SST algorithms MCSST and NLSST originally prepared for AVHRR data could also be used for Meteosat/SEVIRI data with satisfactory accuracy in the mid-latitude region, where the spatial resolution is about 7×7 km. The research was performed in the southern Baltic Sea (between 13◦E 53◦N and 21◦E 58◦N). Data were collected in all the seasons of 2007. The coefficients were found by means of regression analysis. SSTs determined on the basis of AVHRR data were used in the regression analysis instead of in situ data. A set of paired AVHRR and SEVIRI images spaced no more than 8 minutes apart were compared. The results show that the method is capable of producing sea surface temperatures with a statistical error (standard deviation) of 1◦C.
    Źródło:
    Oceanologia; 2010, 52, 3; 331-344
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coastal hydrodynamics beyond the surf zone of the South Baltic Sea
    Autorzy:
    Ostrowski, R.
    Stella, M.
    Szmytkiewicz, P.
    Kapinski, J.
    Marcinkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47802.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    hydrodynamic process
    coastal region
    surf zone
    Southern Baltic Sea
    wind velocity
    bottom sediment
    water column
    theoretical investigation
    experimental investigation
    Źródło:
    Oceanologia; 2018, 60, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shallow-water wave energy dissipation in a multi-bar coastal zone
    Autorzy:
    Pruszak, Z.
    Szmytkiewicz, P.
    Ostrowski, R.
    Skaja, M.
    Szmytkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47959.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal region
    energy dissipation
    surf zone
    Baltic Sea
    wave parameter
    wave motion
    wave transformation
    shallow water
    coastal zone
    offshore wave
    Opis:
    The paper presents the results of studies of wave transformation on a multi-bar cross-shore profile of the southern Baltic Sea. The field investigations of wave motion were carried out using an offshore wave buoy and string wave gauges at the IBW PAN Coastal Research Station, Lubiatowo (Poland). These experimental results were used to validate statistical relationships between characteristic wave parameters in the coastal region and to assess wave energy dissipation in the surf zone. Asimple model for calculating the residual nearshore wave energy is proposed and tested versus the data collected in situ.
    Źródło:
    Oceanologia; 2008, 50, 1; 43-58
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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