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Tytuł:
Determination of roughness coefficient of the underside of ice cover
Autorzy:
Majewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/241490.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
ice cover
roughness coefficient
Opis:
The formation of ice cover in winter on rivers, channels and run-of-reservoirs, changes flow characteristics significantly. Calculations of water surface profiles or discharge along a river reach with ice cover by means of 1-D models, requires detailed values of the roughness coefficients of the river bed and underside of the ice cover. Numerous studies dealing with roughness coefficients of the river bed with free surface flow were carried out in the past, however, very few investigations were performed on the determination of the roughness coefficient of the underside of ice cover. Data of calculations indicate that this coefficient may vary considerably with space and time, depending on the character of the ice cover, flow characteristics and meteorological conditions. In 1-D models roughness coefficient of the bed and of the underside of the ice cover must be combined into one composite roughness coefficient. The paper presents determination of roughness coefficient of the underside of ice cover based on velocity distributions in the Vistula River cross-sections with ice cover. It may be assumed that vertical velocity distribution has a logarithmic character in the regions near the bottom and ice cover. Taking into account this assumption the procedure for the calculation of Darcy-Weisbach friction factor f and Manning roughness coefficient n is proposed, basing on the data of velocity measurements in a given vertical. It was found that roughness coefficient of the underside of the ice cover varies in a much larger range than the bottom roughness coefficient and depends very much on the character of the ice cover.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 3; 219-228
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zlodzenie wybranych jezior w krainie wielkich jezior mazurskich w latach 2006–2010
Ice cover of selected lakes in the masurian lakeland in the years 2006–2010
Autorzy:
Wira, J.
Ptak, M.
Powiązania:
https://bibliotekanauki.pl/articles/407502.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczo-Rozwojowy Inżynierii Lądowej i Wodnej Euroexbud
Tematy:
zlodzenie
jeziora
Polska
ice cover
lakes
Polska
Opis:
W pracy przedstawiono charakterystykę warunków zlodzenia jeziora Jagodne, Śniardwy i Roś w latach 2006–2010. W oparciu o obserwacje prowadzone przez Instytut Meteorologii i Gospodarki Wodnej stwierdzono, że parametry zlodzenia (termin początku i końca zjawisk lodowych, termin początku i końca pokrywy lodowej, grubość pokrywy lodowej) tych jezior są mało zróżnicowane względem siebie. Jest to wynikiem bliskiej ich lokalizacji a w związku z tym takich samych panujących warunków klimatycznych. Pewnym odstępstwem jest wcześniejsza pojawianie się zjawisk lodowych na jeziorze Śniardwy w stosunku do dwóch pozostałych jezior, co należy wiązać z morfometrią tego akwenu (mniejsza głębokość średnia), która decyduje o wcześniejszym wychładzaniu mas wody i pojawianiu się w niej lodu.
The work presents the characteristics of the ice cover conditions of Lake Jagodne, Lake Śniardwy and Lake Roś in the years 2006–2010. On the basis of observations conducted by Institute of Meteorology and Water Management it was ascertained that ice cover parameters (the beginning and end of ice phenomena, the beginning and end of ice cap formation, the thickness of the ice cap) of these lakes do not differ much in relation to one another. This results from the fact that the lakes are close to one another so the climate conditions are also the same. The only difference is the earlier time of the ice cap formation on Lake Śniardwy, which is due to the lake morphometry ( its smaller average depth) which determines earlier water cooling and, consequently, earlier appearance of ice.
Źródło:
Zeszyty Naukowe. Inżynieria Lądowa i Wodna w Kształtowaniu Środowiska; 2015, 12; 38-47
2082-6702
Pojawia się w:
Zeszyty Naukowe. Inżynieria Lądowa i Wodna w Kształtowaniu Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element simulations of floating ice - engineering structure interactions
Autorzy:
Staroszczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/240982.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
finite element simulations
floating ice cover
rigid engineering structure
Opis:
In this paper the problem of interaction between a coherent floating ice cover and a rigid engineering structure is considered. It is assumed that the ice cover, of horizontal dimensions considerably larger than the dimensions of the structure, is driven by wind and water current drag forces. During the interaction process of a quasi-static character, ice is assumed to behave as a creeping material, with a rheology described by the viscous fluid flow law. The ice cover is treated as a plate which sustains both bending due to the vertical reaction of the underlying water and the action of horizontal forces, which gives rise to the development of creep buckles in the plate and subsequently leads to the flexural failure of ice. An approximate solution to the problem is constructed by employing the finite element method. The results of numerical simulations illustrate the magnitudes of the forces exerted on the structure and their dependence on the wind direction and the structure geometry. In addition, the ice plate deflection in the vicinity of the structure is illustrated, and the values of the critical time at which the plate starts to fail by creep buckling are determined to show their dependence on the ice thickness, temperature, and type.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 3; 251-268
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature and ice regimes of waterbodies under the impacts of global warming and a hydropower plant
Autorzy:
Vyshnevskyi, Viktor Ivanovych
Powiązania:
https://bibliotekanauki.pl/articles/1445111.pdf
Data publikacji:
2020
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
water temperature
ice cover
Dnipro
Kyivska HPP
reservoir
remote sensing data
Opis:
Based on the results of regular monitoring and remote sensing data the patterns of water temperature and ice regime of the Dnipro River within Kyiv, as affected by global warming and a hydropower plant, were identified. The characteristic features of this stretch of the river are increasing water temperature, and the decreasing thickness and duration of ice cover. The largest water temperature increase is in summer, with a somewhat smaller increase in autumn. The increase of water temperature in spring is much less than the increase in air temperature. In summer, the gradient of water temperature increase is a little bit less than that of air temperature. In autumn, the gradient of water temperature increase is larger than the gradient of air temperature increase. From April to August the lowest water temperature is usually observed near the Kyivska hydropower plant (HPP), which is located upstream. During this period the water temperature downstream from HPP increases. The uneven daily operation of HPP causes the alternation of areas with different temperature along the Dnipro River. In the cold season the water temperature in the Dnipro River is usually higher than in other nearby urban water bodies. Freezing of the water area usually starts from the small and shallow lakes and ponds. The main branch of the Dnipro River freezes last. On the whole, the sequence of ice melting on the waterbodies is the reverse of the freezing process. The longest ice cover duration in spring is observed in the bays with small water exchange, mainly located at a large distance from Kyivska HPP.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2020, 8, 2; 38-45
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meteorological conditions on Kaffiøyra (NW Spitsbergen) in 2013–2017 and their connection with atmospheric circulation and sea ice extent
Autorzy:
Kejna, Marek
Sobota, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/2041853.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Svalbard
climate change
weather conditions
synoptic situations
sea ice cover
Źródło:
Polish Polar Research; 2019, 40, 3; 175-204
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grubość pokrywy lodowej wybranych jezior o genezie eolicznej, krasowej i rzecznej w województwie świętokrzyskim
Ice cover thickness of selected aeolic, karst and river lakes in Świętokrzyskie Voivodeship
Autorzy:
Zieliński, Artur
Choiński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/43348466.pdf
Data publikacji:
2021-12-15
Wydawca:
Poznańskie Towarzystwo Przyjaciół Nauk
Tematy:
aeolian lakes
karst lakes
river lakes
the thickness of the ice cover
Opis:
The research covered three genetic groups of lakes (karst, aeolian, and riverine) which occur in Świętokrzyskie Voivodeship. Depending on the specific group, the lakes have different morphometric parameters of the lake basin and the water catchment area as well as physical and chemical properties of the water. In winter 2021, after a wave of severe frost, the thickness of the ice was measured on a selected number of lakes. The results of the tests indicate a diverse thickness of the ice caps. Karst lakes had the thickest ice caps. Riverine and aeolian lakes, on the other hand, featured similar thickness of the ice. However, it was noticed that in the case of riverine lakes, the ice cap on shores with prevailing reed was thinner than in the central parts of the lake.
Źródło:
Badania Fizjograficzne Seria A - Geografia Fizyczna; 2021, 12 (72); 191-201
2081-6014
Pojawia się w:
Badania Fizjograficzne Seria A - Geografia Fizyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność zlodzenia wybranych rzek Arktyki w XX wieku
Ice cover variability on some rivers in the Arctic in 20th century
Autorzy:
Grześ, M.
Ćmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/260737.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
Arktyka
rzeki
pokrywa lodowa
trendy
sezon lodowy
Arctic
rivers
ice cover
trends
time of ice
Opis:
W artykule przedstawiono zmienność czasu trwania pokrywy lodowej na 17 dużych rzekach Arktyki. W drugiej połowie XX wieku czas trwania pokrywy lodowej uległ wyraźnemu skróceniu o 21-28 dni na 100 lat. Na czterech rzekach (MacKenzie, Pieczenga, Peczora, Titowka i Taz) czas trwania pokrywy lodowej uległ wydłużeniu nawet o 33 dni na 100 lat. Skrócenie czasu trwania związane jest z późniejszym formowaniem się pokrywy lodowej oraz z jej wcześniejszym rozpadem. Należy przypuszczać, że zmienność czasu trwania zjawisk lodowych jest dobrym wskaźnikiem zachodzących w Arktyce zmian klimatu. Ze skróceniem czasu trwa-nia zjawisk lodowych wiąże się wydłużenie okresu nawigacyjnego.
Trends and fluctuations in the dates of ice cover formation and breakup on selected rivers in the Arctic worked out based on databases: Benson B., Magnuson J., 2000, Global lake and river ice phenology database; Vuglinsky V., 2000, Russian river ice thickness and duration; National Snow and Ice Data Center, 1998, Nenana Ice Classic: Tanana River ice annual breakup dates. Most of the Arctic rivers are frozen for 7-8 months. Dissimilarity of flow conditions during ice cover period, ice jams and dams allow to state that it is the most important part of the Arctic rivers hydrological regime. The main problem in comparison of ice events and determine its trends are heterogeneously data series. Data are selected to be the most similar. In this study are used homogeneous and comparable series for period 1958-1990. For analysis have chosen 17 rivers situated in different Arctic areas. 3 are in Europe, 10 on Siberia and the others 4 in Canadian Arctic and on Alaska. For all of them was calculated average time of ice cover duration, dates of freezing and breakup and trends of this parameters. Difference between ice cover duration on the Arctic rivers is 64 days. The longest time of ice cover duration is on Anabar – 248 days. The shortest, 184 days, on Yukon in Dawson. Average time of ice cover duration on most part of the rivers is more than 200 days. The earliest date of freeze-up is on Anabar river, average 2 October. To the end of the month ice cover is on most of the rivers. At the beginning of November come out on MacKenzie, Yukon and Pechenga rivers. Breakup starts 5 May (Tanana river). To the end of May ice cover vanish on most of the rivers. Exceptions are rivers in Eastern Siberia and Coppermine river, where spring ice drift starts latest, average 18 June. Differences between freeze-up dates amount 40 days, while between breakup on various rivers 44 days. Ice cover duration trends are diverse but generally on most of the rivers trends are negative (for 11 of 16 rivers). The biggest trend was on Yukon river in Dawson in 1970-90 (–24.2 days/100 years). A little bit smaller trend (–23.7 days/100 years) was on Ob (1958-90) and Anabar (–21.8 days/100 years). Positive values characterized rivers: MacKenzie, Pechenga, Pechora and Taz, which had a biggest value (33.2 days/100 years). Freeze-up on the Arctic rivers occurs later and later. It is described by positive value of this parameter. It fluctuates within 0.9 days/100 years on Anabar to 18.9 days/100 years on Coppermine. However in two stations in the Canadian Arctic, 3 in European Arctic and on Lena ice cover freeze-up more and more early. Only two rivers: Yndigirka and Pechora freeze-up later and later (it is 2.7 days/100 years on Yndigirka and 15.7 days/100 years on Pechora). On the others rivers trends are negatives and fluctuates within 0.2 days/100 years (Coppermine) to 47 days/ 100 years (MacKenzie in Fort Good Hope). Presented trend’s values are different from this presented by Magnuson et al. (2000), who compared freezing dates for lakes and rivers together for all the northern hemisphere.
Źródło:
Problemy Klimatologii Polarnej; 2008, 18; 69-78
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność pokrywy lodów morskich w okresie maksimum ich rozwoju na Morzu Grenlandzkim w i połowie XX wieku
Changes in the sea-ice cover during their maximum development in the Grenland Sea in the first half of the twentieth century
Autorzy:
Adrychowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/261045.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
zasięg lodu morskiego
pokrywa lodowa
Morze Grenlandzkie
sea ice extent
sea ice cover
Greenland Sea
Opis:
Artykuł przedstawia zmiany powierzchni lodów występujące w okresie maksimum ich rozwoju (w kwietniu) w rejonie między Grenlandią, Islandią i Spitsbergenem w latach: 1901-1939 oraz 1946-1956 oparte na analizach map lodowych udostępnionych przez Duński Instytut Meteorologiczny. Obliczeń powierzchni lodów dokonano w programie ArcGis10.0 w układzie współrzędnych North Pole Lambert Azimuthal Equal Area. Przeprowadzone pomiary powierzchni zlodzonej wskazują na dużą zmienność powierzchni lodów na obszarze między Spitsbergenem, Grenlandią i Islandią. W tym rejonie największe powierzchnie lodów wystąpiły w 1905, 1906 i 1911 roku, a najmniejsze w latach 1925 i 1930. Znacznie mniejsze zmiany powierzchni lodów miały miejsce w rejonie Cieśniny Duńskiej i na wodach między Islandią i SE Grenlandią. W tym rejonie największy rozwój pokrywy lodowej miał miejsce w 1934, 1935 oraz 1952 roku, a najmniejszy w latach 1939, 1929 i 1903. Na całym badanym obszarze największy rozwój lodów miał miejsce w okresie 1905-1918 z maksimum w latach 1906 (1638 tys. km2), 1911 i 1918. Minimum rozwoju pokrywy lodowej wystąpiło w 1933 roku (1037 tys. km2). W okresie 1901-1939 zaznacza się istotny trend malejący powierzchni lodów. Zmiany powierzchni lodów w latach 1946-1956 charakteryzują się dużą stabilnością oscylującą między 1300 a 1500 tys. km2.
The article present changes of sea ice extent during a period of time when they developed most (April) in the geographical area located between Greenland, Iceland and Spitsbergen during years 1901-1939 and 1945-1956 based on data shared by Danish Meteorological Institute. Surface calculations were made by using ArcGis 10.0 software, using geographical coordinate system North Pole Lambert Azimuthal Equal Area. Results of the calculations show high deviations of sea ice extent at investigated area. Biggest surface area noted in 1905, 1906 and 1911 and smallest in 1925 and 1930. Much smaller changes were observed and at the sea between Iceland and South-Eastern Greenland. During the period 1901-1939 a diminishing trend was observed there considering ice surface area. Years 1946-1956 remain with a stable amount of ice surface.
Źródło:
Problemy Klimatologii Polarnej; 2015, 25; 239-248
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany powierzchni lodów morskich w rejonie Svalbardu w latach 1901-1930
Changes in the sea-ice cover around Svalbard in 1901-1930
Autorzy:
Lange, K.
Powiązania:
https://bibliotekanauki.pl/articles/972206.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
pokrywa lodowa
zasięg lodu morskiego
Svalbard
Arktyka Atlantycka
sea-ice cover
ice extent
Atlantic Arctic
Opis:
Niedawno udostępnione mapy Duńskiego Instytutu Meteorologicznego (DMI) rzucają nowe światło na zmiany zasięgu lodów w Arktyce Atlantyckiej, które dotychczas były głównie oparte na zbiorach archiwalnych Norweskiego Instytutu Meteorologicznego. Artykuł przedstawia zmiany letniej pokrywy lodowej na obszarze między 50°W, a 70°E w sierpniach lat 1901-1930 obliczone na podstawie zmian zasięgu lodów w tym rejonie pokazanych na mapach z archiwum DMI. Obliczenia powierzchni lodów zostały dokonane w programie ArcGis 10.0 w układzie współrzędnych North Pole Lambert Azimuthal Equal Area. Przeprowadzone pomiary powierzchni zlodzonej potwierdzają rozrost pokrywy lodowej w latach 1907-1918 z maksimum w latach 1912 i 1913 oraz występowanie drugorzędnego maksimum rozwoju lodów w latach 1916 i 1917, po którym nastąpił ogólny spadek powierzchni lodów. W tym czasie wykrywa się dwie fazy gwałtownego spadku pokrywy lodowej na badanym akwenie – między rokiem 1921 i 1922 oraz między rokiem 1929 i 1930. Taki przebieg zmian powierzchni lodów w momencie bliskim osiągnięcia przez nie minimum rozwoju w cyklu rocznym jest z dużym przybliżeniem zgodny ze znanymi z pomiarów zmianami temperatury powietrza w tej części Arktyki.
Latest maps released by the Danish Meteorological Institute (DMI ) shed new light on the changes in the Arctic ice coverage that have been mainly based on archival Norwegian Meteorological Institute. The article presents the changes in the surface of sea ice in the area between 50°W and 70°W for the years 1901 to 1930 August , calculated on the basis of changes in ice coverage in the area shown on maps from the archives of DMI . ice surface Calculations have been made in the coordinate North Pole Lambert Azimuthal Equal Area using ArcGis 10.0 The measurements confirm iced surface of ice cover growth in the years 1907-1918 with a maximum between 1912 and 1913 and the presence of a secondary maximum ice growth in the years 1916 and 1917, after which there was a general decline in sea ice area. During this time, detected two phases of rapid decline of ice cover in the examined area between 1921 and 1922 and between 1929 and 1930. Such a course of changes in sea ice area at a time moment close to minimum of the annual cycle of development is close approximation consistent with known from measurements of air temperature changes in this part of the Arctic.
Źródło:
Problemy Klimatologii Polarnej; 2013, 23; 169-179
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nautical electronic maps of S-411 standard and their suitability in navigation for assessment of ice cover condition of the Arctic Ocean
Autorzy:
Pastusiak, T.
Powiązania:
https://bibliotekanauki.pl/articles/92434.pdf
Data publikacji:
2016
Wydawca:
Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
Tematy:
ice cover map
standard IHO S-411
safety
water transport
Northern Sea Route
Opis:
The research on the ice cover of waterways, rivers, lakes, seas and oceans by satellite remote sensing methods began at the end of the twentieth century. There was a lot of data sources in diverse file formats. It has not yet carried out a comparative assessment of their usefulness. A synthetic indicator of the quality of data sources binding maps resolution, file publication, time delay and the functionality for the user was developed in the research process. It reflects well a usefulness of maps and allows to compare them. Qualitative differences of map content have relatively little impact on the overall assessment of the data sources. Resolution of map is generally acceptable. Actuality has the greatest impact on the map content quality for the current vessel’s voyage planning in ice. The highest quality of all studied sources have the regional maps in GIF format issued by the NWS / NOAA, general maps of the Arctic Ocean in NetCDF format issued by the OSI SAF and the general maps of the Arctic Ocean in GRIB-2 format issued by the NCEP / NOAA. Among them are maps containing information on the quality of presented parameter. The leader among the map containing all three of the basic characteristics of ice cover (ice concentration, ice thickness and ice floe size) are vector maps in GML format. They are the new standard of electronic vector maps for the navigation of ships in ice. Publishing of ice cover maps in the standard electronic map format S-411 for navigation of vessels in ice adopted by the International Hydrographic Organization is advisable in case is planned to launch commercial navigation on the lagoons, rivers and canals. The wide availability of and exchange of information on the state of ice cover on rivers, lakes, estuaries and bays, which are used exclusively for water sports, ice sports and ice fishing is possible using handheld mobile phones, smartphones and tablets.
Źródło:
Polish Cartographical Review; 2016, 48, 1; 17-28
2450-6974
Pojawia się w:
Polish Cartographical Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zlodzenie Zatoki Admiralicji a temperatura wody w energoaktywnej strefie Morza Bellingshausena (1982-1997)
Sea ice condition in the Admiralty Bay and the water temperature in the energy-active region of the Bellingshausen Sea (1982-1997)
Autorzy:
Kruszewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/260873.pdf
Data publikacji:
2001
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
zjawiska lodowe
Morze Bellingshausena
Zatoka Admiralicji
pokrywa lodowa
zlodzenia
ice phenomena
Bellingshausen Sea
Admiralty Bay
ice cover
sea ice
Opis:
Correlations, especially those on a regional scale, between the sea ice cover formation and the air and sea surface temperatures have been pointed out by a number of authors. Region that is clearly marked by such correlation is located NW of the Antarctic Peninsula (among others Weatherly and others, King 1994, Styszyńska 1997, 2000). The intensity of ice formation in the relatively small Admiralty Bay noted in a given winter season indicates strong correlation with the winter sea ice cover extent in a regional scale (Kruszew-ski 1999, 2000). This ice cover is influenced (among others) by the sea surface temperature. The possible nature of the correlation between the sea surface temperature (SST) at the meridian of 080°W and the changes in air temperature in the region of the Southern Shetlands as described by Styszyńska suggested the presence of similar correlations with the intensity of ice formation in that region, so in this way also in the Admiralty Bay. With the help of Spearmann correlation coefficient a number of statistically significant relations have been found between the course of SST in the region of 086-062°W and the intensity of ice formation in the Admiralty Bay are presented in a categorised way. These relations are both synchronic and asynchronic. The synchronic correlation is observed mainly between SST in winter months and the ice cover category in the same year (the increase in SST is followed by the decrease in ice cover category).These correlations are most significant in the region 62-66°S (July - September). They also occur farther north 56-58°S but this time in the eastern part of the said region (March-July) and they are also observed in 60-64° (but in January and February). The asynchronic correlations have been observed between SST in October and ice cover category of the Admiralty Bay in the following year(8-11month slater). These correlations are most significantly marked in 56-64°S (the northern part of the Bellingshausen Sea and in the Circumpolar Current region) especially in 60°S 080°W (r = -0.677, p < 0.01) and their character is similar to those of the previously mentioned synchronic correlations.
Źródło:
Problemy Klimatologii Polarnej; 2001, 11; 105-112
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Związki bilansu masy lodowców w rejonie Kongsfjordu (NW Spitsbergen) z pokrywą lodową mórz Grenlandzkiego i Barentsa
Correlation between the mass balance of glaciers in the Kongsfjorden area (NW Spitsbergen) and sea ice cover of the Barents and Greenland seas
Autorzy:
Styszyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/260913.pdf
Data publikacji:
2002
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
Morze Grenlandzkie
Morze Barentsa
lodowce
pokrywa lodowa
Barents Sea
glacier
ice cover
Greenland sea
Opis:
The sea ice cover of the Greenland and Barents seas is characterised by great seasonal and interannual changeability which has influence on radiation and heat balance of that region. This changeability is directly observed in changes in atmospheric circulation and further noted in changes in meteorological elements (mainly in air temperature, cloudiness, precipitation and wind). Changes in weather conditions determine both the value of losses of glacier masses in a given balance year and the value of ice masses accumulation. This article tries to find the answer to a question if and to what extent the variability of the extent and rate of the Barents and Greenland seas ice formation is directly reflected in changeability of glaciers masses balance in the region of Spitsbergen. This research was based on the mass balance of two small glaciers located in the region of Kongsfjord, i.e. Austre Brogger and Midre Lovén. The mean monthly values of sea ice cover observed in the Greenland and Barents seas in the period 1972-1994 were used in this research (the values calculated on the basis of 1-week values of these seas ice cover taken from NCDC - Asheville). The values of winter, summer and net balances of the said glaciers were drawn from article by Lefauconnier et al. (1999). In addition, the correlation was examined between the balance Austre Brogger and Midre Lovén glaciers and the changeability of atmospheric circulation described by Niedźwiedź ?circulation types? (2001). The research made use of standard statistical analysis (correlation and regression analysis). Statistically significant correlations have been noted between the values of winter balances of both examined glaciers and the size of ice cover of the Barents and Greenland seas at the initial stage of its formation - in November (r ~ -0.55÷0.64, adj. R2 ~ 0.30÷0.35). The result of analysis of multiple regression indicated that the strongest correlation with ice cover of the Greenland Sea occurs in September, whereas in the Barents Sea in December (R ~ 0.70÷0.83). Changes in sea ice cover observed in that time explain 44% and 65% of changeability in winter balance of Austre Brogger and Midre Lovén glaciers, respectively. These results suggest that the process of heat transfer from the ocean to the atmosphere may by very intensive when the sea is merely covered with ice in the areas on the way of main directions of air mass advection. This will provide favourable condition for clear domination of sea air masses resulting in the increase in air temperature (Styszyńska 2000) and precipitation in the region of NW Spitsbergen. The summer balance of the examined glaciers is influenced by the changes in ice conditions only to a small extent. The only significant correlation with sea ice condition of the Greenland Sea was noted in August. Lack of the discussed correlation in summer is attributed to the influence of insolation and radiation factors whose importance increase during the polar day (as indicated in research by Lefauconnier et al. (1999)).
Źródło:
Problemy Klimatologii Polarnej; 2002, 12; 133-146
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza struktury i czasu trwania zjawisk lodowych na Warcie na tle warunków termicznych w okresie 1991-2010
The analysis of the structure and duration of ice phenomena on the Warta river in relation to thermic conditions in the years 1991–2010
Autorzy:
Graf, R.
Łukaszewicz, J.
Jawgiel, K.
Powiązania:
https://bibliotekanauki.pl/articles/338625.pdf
Data publikacji:
2018
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
pokrywa lodowa
rzeka Warta
temperatura powietrza
termika wód
zjawiska lodowe
air temperature
ice cover
ice phenomena
Warta River
water thermal conditions
Opis:
W artykule przedstawiono wyniki analizy struktury i czasu trwania zjawisk lodowych na Warcie w latach 1991–2010. Przebieg zjawisk lodowych został opisany na tle zmian temperatury powietrza i wody oraz wskaźnika Oscylacji Północnoatlantyckiej (NAO). Określono formy zjawisk lodowych występujących na Warcie w poszczególnych cyklach jej zlodzenia. Zinterpretowano również zmienność temperatury wody w okresie zimowym i jej wpływ na liczbę dni ze zjawiskami lodowymi. W analizie zjawisk lodowych uwzględniono: charakter odcinka rzeki, na którym prowadzono obserwacje oraz stopień antropopresji, wyrażający się przekształceniem koryta rzecznego, wpływem urbanizacji w strefach większych ośrodków miejskich oraz oddziaływaniem zbiornika Jeziorsko. Na podstawie przeprowadzonych badań wyznaczono ogólną tendencję w zmienności zjawisk lodowych występujących na rzece, a także określono przyczyny zróżnicowania struktury zjawisk w ujęciu regionalnym. Stwierdzono związek pomiędzy przebiegiem i częstością zjawisk lodowych a warunkami termicznymi i fazami NAO.
The article presents the results of the analysis of the structure and duration of ice phenomena on the Warta River. The course of ice phenomena has been described against the background of air and water temperature, and North Atlantic oscillation (NAO) changes including. The forms of ice phenomena, exist on the Warta River in particular cycles of its icing, were determined. The variability of the water temperature in winter and its impact on the number of days with ice phenomena on the river has been taken into consideration. The analysis of ice phenomena has taken into account the nature of the section of the river on which observations were made, the scale of anthropopressure affecting the transformation of the riverbed, the impact of urbanization in the zones of larger urban centers and the influence of the Jeziorsko Reservoir. On the basis of the conducted research, a general tendency was determined for the variability of ice phenomena occurring on the river. Reasons for the differentiation of the structure of ice phenomena on a regional basis were determined. The results show in detail the connection between the course and frequency of ice phenomena and other hand thermal conditions and NAO phases.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2018, 18, 4; 5-28
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensywny dryf lodu w rejonie wyspy Wrangla, zjawiska z nim związane i konsekwencje dla bezpieczeństwa żeglugi
Intensive sea-ice drift near Wrangel Island, associated effects and consequences for the safety of navigation
Autorzy:
Pastusiak, T.
Styszyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/260808.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
dryf lodu morskiego
rzeka lodu
Północna Droga Morska
dywergencja lodu
zmiany pokrywy lodowej
sea-ice drift
ice jet
Northern Sea Route
divergence of ice
ice cover changes
Opis:
Praca omawia zjawiska hydrometeorologiczne towarzyszące intensywnemu dryfowi lodu w rejonie Wyspy Wrangla w dniach 19-30 marca 2012 roku. Rezultaty badania związków pomiędzy parametrami hydrologiczno-meteorologicznymi wykazały silne zależności pomiędzy prędkością wiatru, prędkością prądu morskiego, prędkością dryfu lodu i gradientem poziomu morza. Oszacowana długość „koryta” rzeki lodu wahała się od 100 do 580 Mm zaś jego szerokość od 30 do 180 Mm. Można przyjąć, że długość „koryta” rzeki lodu jest wprost proporcjonalna do prędkości dryfu tego lodu, a szerokość „koryta” jest odwrotnie proporcjonalna do prędkości dryfu tego lodu.
The work discusses the hydro-meteorological phenomena associated with intense ice drift in the vicinity of Wrangel Island in the days of 19-30 March 2012. The results of the study of the correlations between hydrological and meteorological parameters showed strong relationship among the wind speed, sea current rate, speed of ice drift and gradient of sea level. The observed length of the “bed” of ice jet ranges from 100 to 580NM and its width from 30 to 180NM. It can be assumed that the length of the "bed” of ice jet is directly proportional to the speed of the ice drift and the width of the "bed" is inversely proportional to the speed of the ice drift.
Źródło:
Problemy Klimatologii Polarnej; 2013, 23; 191-204
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of ice cover impact on hydrodynamic processes in the Curonian Lagoon through numerical modeling
Autorzy:
Idzelyte, R.
Mezine, J.
Zemlys, P.
Umgiesser, G.
Powiązania:
https://bibliotekanauki.pl/articles/2079075.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
ice cover
water circulation
shallow water
salinity
hydrodynamic process
numerical modelling
remote sensing
meteorological season
satellite observation
Curonian Lagoon
Opis:
In this study, we present an analysis of the hydrodynamic processes under ice cover in the largest lagoon in Europe – the Curonian Lagoon. By applying a finite element numerical modelling system (SHYFEM) and remote sensing ice cover data, the residual circulation, water fluxes through specific areas of the lagoon, saltwater intrusions, and water residence time (WRT) were investigated. The results, taken over an 11 year period, show that ice cover affects the circulation patterns in the lagoon by forming and shifting different gyre systems. Different circulation patterns are observed throughout all the meteorological seasons of the year. Since ice decreases circulation, water fluxes also decrease, especially in a cross-section in the middle of the lagoon, where the ice-cover suppressed wind-stress has a higher impact on the water movement rather than it has in the north. The presence of ice cover also decreases the salinity of the water in the northern part of the lagoon. In general, the salinity in the water column averaged over different periods is vertically uniform, however, a slight increase of salt concentration can be observed at the bottom layers in the Klaipėda Strait, where the difference of >1 PSU between bottom and top layers shows up on average 130 hours per year. The ice cover also decreases the saltwater intrusions into the lagoon by nearly 14 days per year. The increase of WRT is most prominent after long ice cover periods, away from the river inlets, especially in the southern part of the lagoon, where without the help of the wind action, water takes a longer time to renew than in the northern part.
Źródło:
Oceanologia; 2020, 62, 4PA; 428-442
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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