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Tytuł:
Warunki termiczno-tlenowe jeziora charzykowskiego w latach 2014-2016
Thermal and oxygen conditions of lake charzykowskie in the years 2014-2016
Autorzy:
Garbacz, J. K.
Cieściński, J.
Ciechalski, J.
Dąbkowski, R.
Cichowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1359518.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
stratyfikacja wód
deficyt tlenu
Jezioro Charzykowskie
water stratification
oxygen deficit
Lake Charzykowskie
Opis:
W pracy przedstawiono analizę warunków termiczno-tlenowych Jeziora Charzykowskiego w latach 2014-2016 w okresie od maja do sierpnia. Pomiary prowadzono raz w miesiącu, w punktach reprezentujących trzy odmienne baseny w misie badanego jeziora. Wyniki pomiaru temperatury i zawartości tlenu rozpuszczonego w wodzie rejestrowano co 1m od powierzchni do dna w najgłębszym miejscu każdego basenu. Poddano analizie zmiany temperatury i zawartości tlenu rozpuszczonego w każdym z reprezentatywnych punktów pomiarowych dla poszczególnych plos jeziora. Wykazano, że deficyt tlenu rozpuszczonego w wodzie warstw naddennych występuje już na początku okresu stagnacji letniej, a w jego szczycie (sierpień) strefa beztlenowa obejmuje hypolimnion i część metalimnionu. Potwierdzono hipotezę zakładającą, że miąższość warstw termicznych jest zróżnicowana w obrębie misy jeziornej. Wykazano także, że krzywa zawartości tlenu w punktach reprezentatywnych, we wszystkich latach w których prowadzono badania, ewoluuje do postaci klinogrady w szczycie stagnacji letniej, gdzie stężenie tlenu rozpuszczonego maleje wraz z głębokością.
This paper presents an analysis of thermal and oxygen conditions of the Charzykowskie Lake in the years 2014-2016 in the period from May to August. The measurements were carried out once a month, at points representing three different basins in the lake, and the temperatures and oxygen content dissolved in the water were recorded every 1m from the surface to the bottom at the deepest point of each basin. The changes in temperatures and content of dissolved oxygen were analysed in each of the representative measurement points for particular parts of the lake. It has been shown that the deficit of oxygen dissolved in the bottom layers of the water starts occurring by the beginning of the summer stagnation period, whereas at its peak (August) the anaerobic zone includes hypolimnion and part of the metalimnion. The hypothesis that the thickness of the thermal layers varies within the lake basin was confirmed. It was also shown that the oxygen content curve at representative points, in all years of research, evolves to the form of a clinograde at the peak of summer stagnation, where the concentration of dissolved oxygen decreases with the depth.
Źródło:
Polish Hyperbaric Research; 2018, 1(62); 85-96
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uciążliwość zapachowa związana z rekultywacją Jeziora Kortowskiego metodą selektywnego odprowadzania wody z hypolimnionu
Odor nuisance related to Lake Kortowskie restoration by the hypolimnetic withdrawal
Autorzy:
Wysocka, I.
Brudniak, A.
Kowalczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/237878.pdf
Data publikacji:
2014
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
odory
imisja
siarkowodór
stratyfikacja wody
olfaktometria
odors
immission
hydrogen sulfide
water stratification
olfactometry
Opis:
Wyniki badań jakości powietrza atmosferycznego w okolicy odbiornika wody odprowadzanej z hypolimnionu jeziora wskazują, że takie działania naprawcze dzieją się kosztem zanieczyszczania powietrza. Rekultywacja Jeziora Kortowskiego od 1956 r. realizowana jest metodą selektywnego odprowadzania wody rurociągiem z jego strefy przydennej do odpływającej z jeziora rzeki Kortówki. Z tego względu podjęto próbę zastosowania badań olfaktometrycznych do oceny wpływu rekultywacji jeziora na uciążliwość zapachową tej metody. Badania wykazały, że zanieczyszczenie powietrza substancjami złowonnymi (m.in. siarkowodór) w miejscu wprowadzania wody z hypolimnionu do rzeki ulegało silnym wahaniom, jednak stężenie zapachowe zawsze wynosiło powyżej 200 ouE/m3. Największe odnotowane stężenie odorów osiągnęło w tym miejscu prawie 40 tys. ouE/m3. W miarę oddalania się od ujścia rurociągu stężenie substancji zapachowych przeważnie malało aż do zaniku, jednakże było wyczuwalne nawet w odległości ok. 500 m wzdłuż biegu rzeki. Dalsze badania prowadzone są w celu określenia tzw. godzin odorowych oraz wyznaczenia mapy zasięgu uciążliwości zapachowej tego obiektu.
Results of analysis of air quality around the receiver of hypolimnetic discharge demonstrate that such corrective measures take place at the expense of air pollution. Lake Kortowskie (Olsztyn, Poland) restoration is being carried out by selective hypolimnetic water withdrawal through a pipeline to Kortowka river, the receiver of the lake water. This is the reason why olfactometric studies were undertaken to evaluate the impact of lake restoration on the odor nuisance related to the use of this method. The analyses demonstrated that the odorant (e.g. hydrogen sulfide) concentration (immission) in the air just at the river outlet was subject to strong fluctuations. However, it always exceeded 200 ouE/m3. The highest concentration recorded at this site reached almost 40,000 ouE/m3. As the distance from the pipeline outlet increased, the immission usually decreased, until no odor could be detected. However, the odor was still detectable for about 500 m along the course of the river. Further studies are being carried out in order to determine the 'odor hours' and produce an odor map for the site.
Źródło:
Ochrona Środowiska; 2014, 36, 4; 29-32
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the buoyant sub-surface salinity maxima in the Gulf of Riga
Autorzy:
Liblik, T.
Skudra, M.
Lips, U.
Powiązania:
https://bibliotekanauki.pl/articles/48990.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
thermohaline structure
Riga Gulf
water column
temperature
salinity
stratification
water exchange
intrusion
Opis:
Thermohaline structure in the Gulf of Riga (GoR) was investigated by a multiplatform measurement campaign in summer 2015. Stratification of the water column was mainly controlled by the temperature while salinity had only a minor contribution. Buoyant salinity maxima with variable strength were observed in the intermediate layer of the Gulf of Riga. The salinity maxima were likely formed by a simultaneous upwelling—downwelling event at the two opposite sides of the Irbe strait. The inflowing salty water did not reach the deeper (> 35 m) parts of the gulf and, therefore, the near-bottom layer of the gulf remained isolated throughout the summer. Thus, the lateral water exchange regime in the near bottom layer of the Gulf of Riga is more complicated than it was thought previously. We suggest that the occurrence of this type of water exchange resulting in a buoyant inflow and lack of lateral transport into the near-bottom layers might contribute to the rapid seasonal oxygen decline in the Gulf of Riga
Źródło:
Oceanologia; 2017, 59, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between water temperature, nutrients and dissolved oxygen in the Northern Gulf of Aqaba, Red Sea
Autorzy:
Manasrah, R.
Raheed, M.
Badran, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/49092.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
nutrient
Aqaba Gulf
temperature
sea water
Red Sea
oxygen
Opis:
Five years (1998, 2000–2003) of summer records of temperature, nutrients and dissolved oxygen concentrations in the upper 400 m of the water column of the northern Gulf of Aqaba were employed to produce a simple statistical model of the relationship between temperature versus nitrate, phosphate, silicate andd issolved oxygen concentrations. Temperature profiles in the upper 400 m during summer revealeda clear thermocline in the upper 200 m. This was reflected in nutrient ando xygen concentrations as nitrate, phosphate, and silicate increasedfr om the surface to deep water while dissolved oxygen decreased. The best fit relationship between temperature versus nitrate andphosphate was inverse linear and the best fit correlation between temperature versus silicate andd issolvedo xygen was fractional. The observedn utrient concentrations were shaped by a combination of the hydrodynamics and biological factors. Deep winter mixing and high nutrient concentrations dominate during winter. Shortly after the water stratifies in spring, the nutrients are drawn down by phytoplankton during the spring bloom and remain low throughout the rest of the year. The regression equations presented here will be useful in estimating nutrient concentrations from temperature records as long as the annual natural cycle is the main driver of nutrient concentrations and external inputs are insignificant. Deviations from these relationships in the future could provide insight into modifications in the nutrient concentrations probably resulting from new nutrient sources, such as anthropogenic inputs.
Źródło:
Oceanologia; 2006, 48, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany wartości wskaźników jakości wody wraz z głębokością przy ujęciu wody pitnej ze zbiornika Dopczyce
Changes of Water Quality Indices with Depth at Drinking Water Intake from Dobczyce Reservoir
Autorzy:
Bogdał, A.
Policht-Latawiec, A.
Kołdras, S.
Powiązania:
https://bibliotekanauki.pl/articles/1818622.pdf
Data publikacji:
2015
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
zbiornik wodny
jakość wody
eutrofizacja
stratyfikacja
reservoir
quality water
eutrophication
stratification
Opis:
The paper presents a comparative and statistical analysis of the changes of water quality indices values with depth on the water intake from Dobczyce reservoir. Moreover, seasonal variability of the tested indices was analysed and water quality with its usable values were assessed. Dobczyce reservoir is a 12 km long and 1.0 km wide submountain dam reservoir. The reservoir area at the maximum impoundment level (maximum water level) is 915 ha, its capacity 112.1 mln m3 and mean depth 10.2 m. It is situated 20 south of Krakow, in the malopolskie voivodship, myślenicki county. Raw water from the reservoir is collected on tower intake which makes possible water intake from three depth levels. Real water extraction on the intake is about 1.0 m3 ∙s-1, guaranteed 2.5 m3 ∙ s-1 and permissible 5.5 m3 ∙ s-1. The investigations conducted in 2008 and 2009 covered selected physicochemical water indices: the temperature, pH, turbidity, electrolytic conductivity, total suspended solids, dissolved oxygen, oxygen saturation, silica, phosphates, total phosphorus, as well as bioindicator – chlorophyll „a”. At weekly intervals, water samples for laboratory analyses were collected from three depth levels of the reservoir directly at the tower water intake for Krakow. Physicochemical and biological analyses, using referential methods were conducted in the Laboratory of the Municipal Waterworks and Sewer Enterprise in Krakow. For each analysed index mean values for 2008 and 2009 and for the 2008–2009 period of analyses were computed, divided into the winter (October-March) and summer (April-September) half year and for the calendar year (January-December). Statistical significance of the differences between the values of individual indices registered on various depth levels on the reservoir were estimated by nonparametric U Manna-Whitney’a significance test, on α = 0.05. For all investigated indices box-whiskers plots were made which suggestively presented the median, extreme values and 10–90% percentiles. The assessment of Dobczyce reservoir water for drinking water supply for people was conducted following the methodology described in the Regulation of the Minister of the Environment [Dz. U. 2002 Nr 204, poz. 1728]. Selected quality parameters of the tested water were also confronted with the requirements stated in the Regulation of the Minister of Health dated 29 March 2007 on drinking water quality for people [Dz. U. 2007 nr 61, poz. 417]. Trophic state of Dobczyce reservoir was assessed on the basis of total phosphorus and chlorophyll „a” concentrations, using the criteria stated by OECD. On the basis of data analysis it was established that mean annual values of water temperature, pH, oxygen saturation and concentrations of dissolved oxygen and chlorophyll „a” were decreasing with depth. On the other hand, in the vertical profile, turbidity, electrolytic conductivity, as well concentrations of total suspended solids, phosphates and total phosphorus were increasing. Higher water temperatures and pH values were noted in the summer half-year, whereas dissolved oxygen, oxygen saturation and phosphates in the winter half-year. On average for the investigated period, water collected in Dobczyce reservoir on the depth of 3.55 and 9.65 m was classified, respectively to A2 and A3 water category, therefore it required appropriate typical or high performance typical treatment. On the other hand, due to low oxygen saturation in the summer half-year, water on the level of 15.87 m did not meet the standards. Irrespective of the depth, pH and salinity fulfilled the requirements for water intended for direct consumption by people, whereas water turbidity was unsatisfactory all the time. Mean annual concentrations of total phosphorus qualify water collected in the reservoir as mezotrophic, while average and maximum concentrations of chlorophyll „a” allow to regard the water as respectively mezotrophic or eutrophic. Due to relatively big differences in values of the analysed indices, better quality raw water intended for running water outside the growing period supply should be skillfully collected from various depths – generally in the from the shallowest level, in the vegetation season from the middle level and from the lowest level on case higher concentrations of chlorophyll „a” and plankton occur on the first two depths of the reservoir.
Źródło:
Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 1239-1258
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the possibility of convective overturning in the Slupsk Furrow overflow of the Baltic Sea
Autorzy:
Zhurbas, V.
Elken, J.
Paka, V.
Piechura, J.
Chubarenko, I.
Vali, G.
Golenko, N.
Shchuka, S.
Powiązania:
https://bibliotekanauki.pl/articles/48298.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
deep water
dense water
density stratification
gravity current
numerical simulation
saline water
Slupsk Furrow
transverse circulation
water mass
Opis:
Closely spaced CTD transects across the Słupsk Furrow displayed a ‘downward- bending’ of salinity contours below the salinity interface on the southern flank due to a transverse circulation in the saline water overflow. Numerical simulation of a gravity current in an idealized channel with geometry, dimensions and initial density stratification all much the same as in the Słupsk Furrow was applied to verify whether the downward-bending could be transformed into an inverted density stratification. Some arguments in favour of the possibility of convective overturning due to the differential transverse advection beneath the gravity current, brought on by the numerical simulations, are discussed.
Źródło:
Oceanologia; 2011, 53, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of currents over the southern slope of the Gulf of Finland
Autorzy:
Suhhova, I.
Pavelson, J.
Lagemaa, P.
Powiązania:
https://bibliotekanauki.pl/articles/48946.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
stratification
upwelling
downwelling
Finland Gulf
coastal sea water
seasonal thermocline
current velocity
Źródło:
Oceanologia; 2015, 57, 2
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:
Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production
Autorzy:
Hinrichsen, H.H.
Lehmann, A.
Petereit, C.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/47630.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
fish egg
development
thermal stratification
winter
water
Baltic Sea
mass formation
survival
Opis:
The thermal stratification of the upper water layers in the Baltic Sea varies seasonally in response to the annual cycle of solar heating and wind-induced mixing. In winter,the stratification down to the halocline is almost completely eroded by convection and strong wind mixing. Monthly averaged temperature profiles obtained from the ICES hydrographic database were used to study the long-term variability (1950 to 2005) of winter water mass formation in different deep basins of the Baltic Sea east of the island of Bornholm. Besides strong interannual variability of deep winter water temperatures,the last two decades show a positive trend (increase of 1–1.5◦C). Correlations of winter surface temperatures to temperatures of the winter water body located directly above or within the top of the halocline were strongly positive until the autumn months. Such a close coupling allows sea surface temperatures in winter to be used to forecast the seasonal development of the thermal signature in deeper layers with a high degree of confidence. The most significant impact of winter sea surface temperatures on the thermal signature in this depth range can be assigned to February/March. Stronger solar heating during spring and summer results in thermal stratification of the water column leading to a complete decoupling of surface and deep winter water temperatures. Based on laboratory experiments,temp erature-dependent relationships were utilised to analyse interannual variations of biological processes with special emphasis on the upper trophic levels (e.g.,stage-sp ecific developmental rates of zooplankton and survival rates of fish eggs).
Źródło:
Oceanologia; 2007, 49, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin
Autorzy:
Stigebrandt, A.
Powiązania:
https://bibliotekanauki.pl/articles/49102.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
hydrographic condition
Bornholm Basin
salinity
oxygen concentration
vertical stratification
deep water
Baltic Sea
Opis:
This paper is based on the idea that the hydrographical conditions in the Bornholm Basin, and any other basin, can be understood from knowledge of general hydromechanical principles and basin-specific factors. Published results on the variability of the vertical stratification are shown and discussed. Such analyses demonstrate the residence time of water at different depth levels. Different modes of currents forced by winds and by stratification gradients at open vertical boundaries are presented. Vertical mixing is discussed and published results for the Bornholm Basin are shown. An experiment demonstrates that the diffusive properties of the enclosed basin, i.e. below the sill depth of the Słupsk Furrow, can be computed quite well from the horizontal mean vertical diffusivity obtained from historical hydrographical observations. A published two decades long simulation of the vertical stratification shows that the through flow and modification of new deepwater in the Bornholm Basin can be well described based on existing knowledge regarding crucial hydromechanical processes. It also suggests, indirectly, that there should be a weak anticyclonic circulation above the sill depth, which is supported by current measurements.
Źródło:
Oceanologia; 2017, 59, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of a Thermocline on Water Dynamics in Reservoirs – Dobczyce Reservoir Case
Autorzy:
Hachaj, P. S.
Szlapa, M.
Powiązania:
https://bibliotekanauki.pl/articles/140137.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
storage reservoir
water dynamics
numerical simulation
thermocline
stratification
zbiornik retencyjny
dynamika wody
symulacja numeryczna
termoklina
uwarstwienie
Opis:
While modeling water dynamics in dam reservoirs, it is usually assumed that the flow involves the whole water body. It is true for shallow reservoirs (up to several meters of depth) but may be false for deeper ones. The possible presence of a thermocline creates an inactive bottom layer that does not move, causing all the discharge to be carried by the upper strata. This study compares the results of hydrodydynamic simulations performed for the whole reservoir to the ones carried out for the upper strata only. The validity of a non-stratified flow approximation is then discussed.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 2; 189-203
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Theoretical Studies of Heat Losses from the Hot Water Storage Tank
Badania eksperymentalne i teoretyczne strat ciepła zasobnika ciepłej wody
Autorzy:
Dopieralska, K.
Siuta-Olcha, A.
Cholewa, T.
Studzińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1818096.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
heat loss coefficient
hot water tank
thermal stratification
współczynnik strat ciepła
zbiornik ciepłej wody
stratyfikacja termiczna
Opis:
Efektywność magazynowania ciepła ma wpływ na efektywność energetyczną instalacji ciepłej wody. Do jej zwiększenia przyczynia się utrzymanie rozwarstwienia termicznego w zasobniku ciepłej wody. Zaburzenie stratyfikacji termicznej może być spowodowane między innymi stratami ciepła ze zbiornika do otoczenia. W pracy przedstawiono dynamikę zmian temperatury wody w zasobniku o pojemności 350 dm3, podczas jego wychładzania w godzinach nocnych, na podstawie przeprowadzonych pomiarów temperatury wody magazynowanej na 15 wyróżnionych poziomach. Dla zasobnika obliczono współczynniki strat ciepła dla części górnej, bocznej oraz dolnej, jak również dla całego zasobnika. Uzyskane wyniki odniesiono do wyników badań innych autorów.
Źródło:
Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 758-769
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation of energy for diapycnal mixing in the Baltic Sea due to internal wave drag acting on wind-driven barotropic currents
Autorzy:
Nohr, C.
Gustafsson, B.G.
Powiązania:
https://bibliotekanauki.pl/articles/48609.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
North Sea
barotropic motion
computation
deep water
halocline
internal wave
saline water
sea level
seasonal thermocline
shallow water
stratification
surface area
turbulent mixing
water exchange
wind force
Opis:
The pathways of energy supply for mixing the deep waters of the Baltic Sea is largely unknown. In this paper, a parameterization of the internal wave drag forces on barotropic motion is developed and implemented into a two-dimensional shallow water model of the Baltic Sea. The model is validated against observed sea levels. The dissipation of barotropic motion by internal wave drag that is quantified from the model results show that breaking internal waves generated by wind forced barotropic motions can contribute significantly to diapycnal mixing in the deep water of the Baltic Sea.
Źródło:
Oceanologia; 2009, 51, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic features of successive upwelling events in the Baltic Sea - a numerical case study
Autorzy:
Myrberg, K.
Andrejev, O.
Lehmann, A.
Powiązania:
https://bibliotekanauki.pl/articles/48404.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
Hel Peninsula
numerical modelling
coastal upwelling
thermal stratification
sea surface temperature
water column
Polish coast
Opis:
Coastal upwelling often reveals itself during the thermal stratification season as an abrupt sea surface temperature (SST) drop. Its intensity depends not only on the magnitude of an upwelling-favourable wind impulse but also on the temperature stratification of the water column during the initial stage of the event. When a ‘chain’ of upwelling events is taking place, one event may play a part in forming the initial stratification for the next one; consequently, SST may drop significantly even with a reduced wind impulse. Two upwelling events were simulated on the Polish coast in August 1996 using a three-dimensional, baroclinic prognostic model. The model results proved to be in good agreement with in situ observations and satellite data. Comparison of the simulated upwelling events show that the first one required a wind impulse of 28 000 kg m−1 s−1 to reach its mature, full form, whereas an impulse of only 7500 kg m−1 s−1 was sufficient to bring about a significant drop in SST at the end of the second event. In practical applications like operational modelling, the initial stratification conditions prior to an upwelling event should be described with care in order to be able to simulate the coming event with very good accuracy.
Źródło:
Oceanologia; 2010, 52, 1; 77-99
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential risk of Mesodinium rubrum bloom in the aquaculture area of Dapeng’ao cove, China: diurnal changes in the ciliate community structure in the surface water
Autorzy:
Liu, H.
Song, X.
Huang, L.
Tan, Y.
Zhong, Y.
Huang, J.R.
Powiązania:
https://bibliotekanauki.pl/articles/47949.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
potential risk
Mesodinium rubrum
bloom
aquaculture area
Dapeng'ao cove
China
diurnal change
ciliate community
surface water
heavy rainfall
water column
stratification
irradiance
Opis:
Diurnal changes in the structure of the ciliate community in surface waters were studied in the aquaculture area of Dapeng’ao cove, China. Two periods of heavy rainfall occurred during the study period, intensifying water column stratification and influencing the water’s properties. A total of 21 ciliate taxa from 15 genera were identified; the dominant species was Mesodinium rubrum. The maximum abundance of M. rubrum reached 3.92×104 indiv. dm−3, contributing 95.1% (mean value) to the total ciliate abundance. Diurnal changes in M. rubrum abundance were highly variable, the driving force probably being irradiance and food availability. The results suggest that M. rubrum may form blooms in aquaculture areas when there is a suitable physical regime with enriched nutrients, which is potentially harmful to the fish-farming industry.
Źródło:
Oceanologia; 2012, 54, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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