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    Wyświetlanie 1-6 z 6
    Tytuł:
    Unravelling the spatio-temporal variation of zooplankton community from the river Matla in the Sundarbans Estuarine System, India
    Autorzy:
    Nandy, T.
    Mandal, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079187.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    zooplankton
    Copepoda
    bioindicator
    spatio-temporal variability
    ecosystem functioning
    seasonal fluctuation
    estuarine water
    Indian Sundarban
    hydrographic change
    Opis:
    Zooplankton is an important bioindicator of ecosystem functioning. Knowledge of the seasonal fluctuation in the zooplankton population in estuarine waters of the Indian Sundarbans is rather limited. In the present study, we analysed the community structure of zooplankton assemblages and their spatio-temporal variations based on different multivariate statistics and indicator value analysis. A total of 56 taxa were identified and the density was primarily dominated by planktonic copepods and few meroplankton communities during four sampling seasons. The most abundant species were: Acartia spinicauda, Acartia sp., Bestiolina similis, Euterpina acutifrons, Labidocera acuta, Paracalanus aculeatus, Paracalanus parvus and Paracalanus indicus. Canonical Correspondence Analysis highlighted that temperature, pH, DO, salinity and nutrients were the prevailing environmental parameters associated with significant spatio-temporal changes of zooplankton distribution in this area. The highest abundance of zooplankton was recorded in winter, followed by monsoon, summer and spring. Throughout the study period, different zooplankton indices were observed in good condition. Seasonal occurrence of dominant zooplankton with high IndVal index was markedly observed and it might be used as a potential bioindicator for a particular season and environmental condition in this estuarine complex. The results of this study provide evidence for the presence of warm water species in the estuarine waters of the Indian Sundarbans and can be a clear indication of climate change-mediated elevated temperature in the estuarine system. Our results underscore the high diversity of zooplankton from mangrove dominated estuarine complex and emphasize the need for long-term monitoring in ecologically fragile ecosystems like the Sundarbans Estuarine System.
    Źródło:
    Oceanologia; 2020, 62, 3; 326-346
    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:
    Phytoplankton and environmental variables as a water quality indicator for the beaches at Matrouh, South-Eastern Mediterranean Sea, Egypt: an assessment
    Autorzy:
    Gharib, S.M.
    El-Sherif, Z.M.
    Abdel-Halim, A.M.
    Radwan, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48802.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    abiotic environment
    beach
    biotic environment
    community structure
    diversity index
    Egypt
    environment variability
    hydrochemical change
    hydrographic change
    marine environment
    Matrouh beach
    Mediterranean Sea
    nutrient concentration
    phytoplankton
    water quality
    Opis:
    This study was carried out to determine the water quality of the beaches at Matrouh, south-eastern Mediterranean Sea, Egypt, by studying environmental variables as well as phytoplankton abundance and community structure. Surface water samples were monitored from a series of beach sites over a period of five seasons during 2009–2010. A total of 203 phytoplankton species were identified from seven algal divisions. Seasonal differences in the quantitative and qualitative composition of the phytoplankton communities in the different sites were marked. Nutrient concentrations and phytoplankton abundances were found to be poorer than those of many other areas along Egyptian coast. The Shannon-Wiener Diversity Index classified Matrouh water as being between clean and moderately polluted, whereas the WQI demonstrated that it was between good and excellent. It can be concluded that the index based onWQI is currently more suitable than the phytoplankton species index for assessing the quality of the water of the Matrouh beaches.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ewolucja Doliny Dolnej Warty od XVII do XX w. na podstawie analiz kartograficznych
    Evolution of the lower Valley Warta of XVII to XX century on the analysis based on cartographic
    Autorzy:
    Goraj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/88327.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    zmiany stosunków wodnych
    dolina dolnej Warty
    zmiany sieci hydrograficznej
    water relations
    lower Warta valley
    change the hydrographic network
    Opis:
    Niniejsza analiza stanowiąca część pracy doktorskiej dotyczy reinterpretacji danych kartograficznych ukazujących się od XVII do końca XX w. W analizie elementów hydrograficznych przyjęto skalę dokumentów 1: 100 000 w pięciu niezależnie kartowanych map. Ewolucję układów hydrograficznych Dolina Dolnej Warty rozpatrywano na odcinku od Gorzowa Wielkopolskiego do Kostrzyna nad Odrą. Celem niniejsze analizy jest próba odtworzenia zmian hydrograficznych od XVII do XX w. wskazanego obszaru badawczego. W analizie wykorzystano również mapy przeglądowe z XVI w. porównując elementy sieci rzecznej oraz dokonując oceny ich wiarygodności i zasięgu przemian stosunków wodnych związanych z antropopresją. Różny poziom kartometryczności map przeglądowych, oraz sposób prezentacji treści hydrograficznej ograniczają ich przydatność w analizach przestrzennych, ale należy podkreślić, że są potrzebnym źródłem informacji wzbogacając zakres danych na rozpatrywanym obszarze.
    This analysis forms part of the doctoral thesis concerns the reinterpretation of cartographic data appearing from the seventeenth to the end of the twentieth century. In this analysis, hydrographic elements of the documents adopted scale of 1: 100 000 in five independently mapping maps. The evolution of hydrographic systems considered in the section from Gorzow Wielkopolski to Kostrzyn on Oder – lower course of the Warta River at the mouth of the Oder near Kostrzyn - Lower Warta Valley. The analysis also used maps inspection of the sixteenth century. Comparing the river network elements and by assessing the reliability and range of changes of waterrelated anthropopressure. Different levels of cartometric maps for review and presentation of content hydrographic limit their usefulness in spatial analyzes, but it should be emphasized that they are an invaluable source of information enriching the range of data in the relevant area.
    Źródło:
    Prace Komisji Krajobrazu Kulturowego; 2015, 28; 99-120
    1896-1460
    2391-5293
    Pojawia się w:
    Prace Komisji Krajobrazu Kulturowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increases in the temperature and salinity of deep and intermediate waters in the West Spitsbergen Current region in 1997–2016
    Autorzy:
    Merchel, M.
    Walczowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079090.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    climate change
    deep water
    temperature
    salinity
    intermediate water
    West Spitsbergen current
    hydrographic data
    Opis:
    This study investigated the temporal variability in the basic physical properties of deep and intermediate waters in the West Spitsbergen Current region at 76°30’N latitude from 1997 to 2016. Emphasis was placed on quantifying the changes in temperature and salinity and determining the potential drivers of these changes. Hydrographic data were obtained during annual summer cruises aboard the r/v Oceania in the Nordic Seas. The increase in the water temperature, which was especially strong in the western part of the investigated section, was associated with considerable changes in the water layers salinity. The temperature and salinity of the intermediate water increased much faster (0.021°C yr−1 and 0.0022 yr−1, respectively) than those of the deep water (0.009°C yr−1 and 0.0004 yr−1, respectively). The warming rate in the upper 2000 m was also higher than the mean warming rate of the global ocean. The source of the deep water temperature and salinity increases was the deep water inflow from the Arctic Ocean into the Greenland Sea. In contrast, the increase in these properties in the intermediate water was associated with the advection of warmer and more saline Atlantic Water from the North Atlantic to the Nordic Seas.
    Źródło:
    Oceanologia; 2020, 62, 4PA; 501-510
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the ecosystem response to summer coastal upwelling in the Northern South China Sea
    Autorzy:
    Jiang, R.
    Wang, Y.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/47804.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    nutrient
    phytoplankton
    zooplankton
    ecosystem model
    coastal upwelling
    hydrographic condition
    seasonal change
    sea surface temperature
    South China Sea
    Opis:
    A coupled three-dimensional physical model and a nitrogen-based nutrient, phytoplankton, zooplankton, and detritus (NPZD) ecosystem model were applied to simulate the summer coastal upwelling system over the continental shelf of northern South China Sea (NSCS) and its impact on hydrographic conditions and ecosystem. The simulated results were comprehensively validated against field and satellite measurements. The model results show that the near shore ecosystem of NSCS has significant responses to the summer coastal upwelling system. The Shantou Coast to the Nanri Islands of Fujian province (YD) and the east of the Leizhou Peninsula (QD) are two main regions affected by NSCS summer coast upwelling. During summer, these two coastal areas are characterized by nearshore cold and high salinity upwelling current. Further, the summer coastal upwelling serves as a perfect nutrient pump, which lifts up and advects nutrient-rich current from deep to surface, from inner shelf to about 30 km outer shelf. This nutrient source reaches its maximum in the middle of July and then begins to decrease. However, the maximum phytoplankton and chlorophyll a do not coincide with the maximum nutrients and delay for about 10 days. Because of the intensive seasonal thermocline and the complicated current transporting through Qiongzhou strait, the ecological responding of QD is less pronounced than YD. This study has a better understanding of the physically modulated ecological responses to the NSCS summer coastal upwelling system.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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