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    Wyświetlanie 1-9 z 9
    Tytuł:
    Variability of chlorophyll-a and diatoms in the frontal ecosystem of Indian Ocean sector of the Southern Ocean
    Autorzy:
    Rajani Kanta, Mishra
    Babula, Jena
    Pillai Anilkumar, Narayana
    Ravidas Krishna, Naik
    Venkateswaran Bhaskar, Parli
    Soares, Melena A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042169.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctic
    chlorophyll-a
    diatoms
    Southern Ocean
    Źródło:
    Polish Polar Research; 2017, 38, 3; 375-392
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planktonic foraminiferal response to Middle Miocene cooling in the Southern Ocean [ODP Site 747, Kerguelen Plateau]
    Autorzy:
    Majewski, W
    Powiązania:
    https://bibliotekanauki.pl/articles/21967.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    plankton
    Foraminifera
    response
    Middle Miocene
    Southern Ocean
    Kerguelen Plateau
    climate change
    Miocene
    paleontology
    Opis:
    The response of planktonic foraminifera to changing oceanographic conditions during Middle Miocene Climate Transition (MMCT) ~14 million years ago (Ma) at ODP Site 747 (Kergeulen Plateau) is investigated. Faunal changes are presented in the background of sea surface temperature (SST) estimates and multi−taxon δ18O and δ13C data presented in other studies. Four faunal transitions are distinguished between 15.0 and 12.2 Ma. The first two affected only a limited number of taxa, and do not lead to large−scale assemblage reorganizations. They are only minor assemblage changes within the pre−MMCT fauna. The first (14.5–14.4 Ma) is marked by a reduction in the Globorotalia zealandica plexus in favor of the Globorotalia praescitula plexus, coupled with the first signs of increased seasonality. The second (14.3–14.2 Ma) is characterized by recovery and diversification of the G. zealandica plexus and an increase in Turborotalita quinqueloba in response to further enhanced seasonality. The third faunal transition across the Middle Miocene Shift (MMS) in 18O (13.9–13.8 Ma) affects almost all planktonic foraminifera, leading to dismembering of the pre−MMCT assemblage. These changes were triggered by the SST drop by ~7C, followed by reduced sea−surface salinity following the MMS, which favored the opportunistic Neogloboquadrina continuosa. Its dominance spans the transitional period (13.8–13.2 Ma), during which several planktonic foraminiferal events gradually shaped the post−MMCT assemblage. The fourth faunal threshold took place during the hiatus in the ODP Hole 747A record spanning 13.2–12.5 Ma. It is expressed by the establishment of an assemblage dominated by Globorotalia praescitula and Globigerina bulloides in association with diminishing of the low−salinity surface layer. The two dominant taxa exhibit well−defined morphologies, much different from their earlier relatives. The microperforate foraminifera show relatively few morphological changes, probably due to their morphological conservatism. Their changes are thought to herald the large foraminiferal transformations, especially in case of the third and fourth faunal transition thresholds.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 3; 541-560
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rekonstrukcje paleotemperatur w strefie Frontu Polarnego Oceanu Południowego (sektor atlantycki) na podstawie środkowo-górnoplejstoceńskich promienic z odwiertu ODP Leg 177 Site 1091
    Paleotemperature reconstructions at the Polar Front in the Southern Ocean (Atlantic sector) based on middle–late Pleistocene radiolarian record from ODP Leg 177 Site 1091
    Autorzy:
    Kotrys, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075164.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    radiolaria
    Southern Ocean
    Polar Front
    summer sea surface temperature
    promienica
    Ocean Południowy
    Front Polarny
    letnia temperatura powierzchni morza
    Opis:
    Quantitative analysis of radiolarian assemblages, carried out at the Ocean Drilling Program (ODP) Leg 177 Site 1091 (Atlantic sector of the Southern Ocean), provides a well-established summer sea surface temperature (SSST) record from the Polar Front Zone extending back into the Middle Pleistocene at orbital- -submillennial resolution. In order to estimate the SSST, the Imbrie & Kipp method (IKM) and the artificial neural network (ANN) were applied. The SSST records derived from the IKM and ANN display close similarities in paleotemperature fluctuations, amplitudes and absolute values. The ANN-derived SSST estimations display a pattern of slightly more distinct warm events that is closest to the records obtained from EDC (EPICA Dome C) ice cores and ODP Site 1090. The warm events indicate a distinct shift in the extent of the Southern Ocean cold water sphere that must have affected the ocean–atmosphere–ice field interactions and the configuration of high-latitude wind fields. Consistently with the global trend of paleotemperature fluctuation, the SSST record is marked by a distinct shift from low to high glacial/interglacial variability around Termination V. Prior to Termination V, the SSST displays coldest values and low variability. It points to a distinct expansion of the Southern Ocean cold water masses and positional changes of hydrographical fronts during most of the lower Middle Pleistocene.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 9; 448--455
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    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:
    Czynniki zmian klimatycznych w środkowym i górnym plejstocenie : ich zapis geologiczny w osadach Oceanu Południowego oraz rdzeniach lodowych
    Climate change indicators in middle and late Pleistocene as reflected in sediments of Southern Ocean and ice core records
    Autorzy:
    Kotrys, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075570.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    plejstocen
    Ocean Południowy
    morskie stadium izotopowe
    temperatura powierzchni morza
    glacjał
    interglacjał
    Pleistocene
    Southern Ocean
    Marine Isotope Stage
    sea surface temperature
    glacials
    interglacials
    Opis:
    Climate changes during the Pleistocene were driven by large-scale orbital perturbations as well as by internal feedbacks on the Earth. One of the main roles in climate modelling is played by the Southern Ocean that is a great source of sea ice, carbon dioxide, dissolved silica and nutrients. Numerous sediment and ice records derived from the Southern Ocean and Antarctica document high-resolution climatic changes that allow us a better understanding of global climate evolution. Consistently with the global climatic trend, several sea surface temperature (SST) records of the Southern Ocean are marked by a distinct shift from low to high glacial/interglacial variability around Termination V (T V), called the Mid-Brunhes Event (MBE). Prior to T V, the Southern Ocean’s SST displays lower values and low variability. It points to a distinct expansion of the Southern Ocean cold water masses and positional changes of hydrographical fronts during most of the lower Middle Pleistocene, which started in the Pliocene. Beside large climatic changes, several abrupt distinct warming and cooling phases have been recognized. Some of them (MIS 22–19, MIS 11 and MIS 5) show similarities to MIS 1, which could be used for future climate predictions. In this paper we would like to present the middle and late Pleistocene climatic mechanisms in the Southern Ocean, and to show SST changes in relation to the hydrographic frontal movement, sea ice development and CO2 oscillations.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 1; 35--42
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trendy temperatury powierzchni oceanu w sektorze pacyficznym Oceanu Południowego w ostatnim 25-leciu
    Trends in the sea surface temperature in the Pacific sector of the Southern Ocean in the las 25 year period (1980-2004
    Autorzy:
    Marsz, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260641.pdf
    Data publikacji:
    2005
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    temperatury powierzchni oceanu
    ochłodzenie powierzchni oceanu
    Ocean Południowy
    sektor pacyficzny
    Antarktyka
    sea surface temperature
    sea surface cooling
    climatic changes
    Southern Ocean
    Pacific sector
    Antarctic
    Opis:
    Praca omawia zmiany temperatury powierzchni wody (TPO) sektora pacyficznego Oceanu Południowego w pasach szerokości 60 i 50°S, zachodzące w przekrojach miesięcznych i rocznych. Stwierdzono występowanie ujemnych trendów TPO w całym pasie 60°S, z czego ponad 1/3 współczynników trendu jest istotna i wysoce istotna statystycznie. Obszary silnego ochłodzenia powierzchni oceanu tworzą tam dwa ośrodki: pierwszy w rejonie 170°E - 140°W, drugi - 120-080°W. W obu ośrodkach najsilniejsze spadki TPO następują w miesiącach chłodnej pory roku (maj - sierpień), w drugim - dodatkowo - stosunkowo silne ochłodzenie zaznacza się w miesiącach ciepłej pory roku (styczeń - marzec). Na szerokości 50°S ochłodzenie jest znacznie słabsze - istotne statystycznie zmiany TPO zaznaczają się wyłącznie po wschodniej stronie sektora (100-080°W), gdzie również występują trendy ujemne. Kumulacja istotnych i nieistotnych statystycznie trendów miesięcznych prowadzi do zaznaczania się na obszarze około 54% powierzchni sektora pacyficznego Oceanu Południowego istotnych statystycznie, ujemnych trendów rocznej TPO. Na pozostałym obszarze badanego sektora bądź brak realnych zmian TPO, bądź występuje tendencja do słabego spadku temperatury. Przebiegi temperatury rocznej wskazują, że w ośrodku zachodnim (60°S, 170°E -140°W) TPO konsekwentnie obniża się od początku obserwacji (1980 rok), gdy we wschodniej części sektora pacy-ficznego (120-080°W) cały obserwowany w 25-leciu trend stanowi konsekwencję silnego spadku rocznej TPO w ciągu ostatnich 7 lat (1997-2004).
    This work deals with monthly and annual changes in sea surface temperature (SST) of the Pacific sector of the South Ocean observed in 60°- 50°S latitudinal bands. The occurrence of negative trends of SST was noted in the entire 60° band and 1/3 of the trend coefficients is statistically significant and highly significant. The regions marked by strong cooling of ocean surface are formed by two centres - one 170° - 140°W and the other extending from 120° to 080°W. The greatest decrease in sea surface temperature in both centres takes place during cold season (May - August), in the other centre there is also additional quite strong cooling in the months of warm season (January - March). In the latitude 50°S the cooling is much weaker - statistically significant changes in SST are observed only in the eastern part of the Pacific region (100°- 080°W) where negative trends are also noted. Cumulating of statistically significant and non-significant monthly trends leads to statistically significant negative trends in annual SST observed in 54% of the area in the Pacific sector of the South Ocean. In the remaining area of the Pacific sector of the South Ocean there are either no visible changes in the sea surface temperature or there is tendency of weak decrease in temperature. The courses of annual SST indicate that in the western region (60S°, 170° -140°W) the SST has been decreasing constantly since the beginning of the observational period (since the year 1980), whereas in the eastern part of the Pacific sector (120°- 080°W) the whole trend observed over the 25-year period results from strong decrease in annual SST in the period of last 7 years (1997-2004).
    Źródło:
    Problemy Klimatologii Polarnej; 2005, 15; 17-26
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial and temporal patterns of ocean variability using empirical orthogonal functions (EOF) in the Southern Java Waters
    Autorzy:
    Syamsuddin, Mega
    Powiązania:
    https://bibliotekanauki.pl/articles/1031454.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    El Niño Southern Oscillation
    Empirical Orthogonal Function
    Ocean variability
    Opis:
    The oceanographic parameters of Sea Surface Temperature (SST) from NOAA/AVHRR, Chlorophyll-a (Chl-a) from SeaWiFS and Modis/Aqua, Sea Surface Height Anomaly (SSHA) and eddy kinetic energy (EKE) from from TOPEX and Poseidon ERS-1/2 are used to understand the oceanographic variability in the Southern Java Waters. Analyses were done using empirical orthogonal function (EOF) and wavelet spectrum analysis in order to know spatial and temporal distributions related to the main forcing of the ocean climate variability for the period of January 1997 to December 2008 (12 years). The first EOF modes of Chl-a, SSHA and SST accounted for 42.8%, 36.5%, and 27.4% of total variance, corresponded with interannual signal for all the first modes, respectively. The spatial patterns of the first and second EOF modes of SSHA, SST and Chl-a gave a very typical cold water of SSHA, low SST and high Chl-a concentration located along the southern coast of Indonesian archipelago and warm water of SSHA, high SST and much less Chl-a concentration in the offshore region to make frontal areas along the latitudinal line around 10–12ºS. The results showed that total variance of the first two mode of SSHA, SST, and Chl-a explain 59.94%, 35.52%, and 55.26 %, respectively. These infer that SSHA and Chl-a give more response to the climate variability of El Niño Southern Oscillation (ENSO) forcing in the study area.
    Źródło:
    World Scientific News; 2020, 142; 76-87
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wind- and density-driven water circulation in the Southern Baltic Sea - a numerical analysis
    Autorzy:
    Herman, A.
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964085.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    wind-driven circulation
    density currents
    hydrodynamic modeling
    Stope Channel
    Southern Baltic
    Princeton Ocean Model
    Opis:
    The study focuses on the hydrodynamic processes in the southern Baltic Sea, with special interest in the Stolpe Channel - the only deep water connection between Bornholm Basin to the west and Gdansk and Gotland Basins to the east. The Channel is an area of strong interactions of wind- and density-driven currents that may lead to a complex flow structure. A three-dimensional numerical model was applied to an analysis of processes mentioned above. Three model versions of different spatial resolution (5, 3 and 1Nm) were used to investigate an influence of this parameter on the model results. The simulations were performed for four main wind directions, for a variable in time wind speed. It was shown that water circulation in the southern Baltic is to a high degree dependent on local anemobaric conditions. The results confirm the hypothesis of Krauss and Brugge that the flow in the Channel is opposite to the wind direction. Numerical grid step can have a decisive influence on the modeled circulation patterns, especially when barotropic andbaroclinic flow components counteract. In such situations - when the flow is bidirectional and mesoscale eddies are generated - high resolution of the model is particularly important.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 29-58
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The sinking of another Tristan da Cunha moss endemic and its phytogeographical consequences
    Autorzy:
    Ochyra, R.
    Plasek, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130713.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Afro-American disjuncts
    amphi-Atlantic distribution
    Bryophyta
    Musci
    phytogeography
    Atlantic Ocean
    southern cool-temperate zone
    taxonomy
    Opis:
    The original material of Isopterygium tristaniense Dixon, an endemic species of the Tristan da Cunha archipelago in the central South Atlantic Ocean, is taxonomically evaluated and some details of its morphology are illustrated. The species is found to be conspecific with the Holarctic Pseudotaxiphyllum elegans (Brid.) Z. Iwats. and this is the third record of the species in the Southern Hemisphere. The global distribution of this species is reviewed, and the distribution patterns of the South Atlantic mosses are briefly discussed.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2020, 89, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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