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Tytuł:
Influence of morphology changes on flow and water exchange in the Odra Estuary
Autorzy:
Jasińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/241071.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
morphology changes
flow exchange
water exchange
Odra estuary
Opis:
Knowledge of the hydrodynamic conditions and the exchange of water in estuaries is important for ecological, navigational and water management reasons. The morpho-logy, river flow, sea level and local winds constitute important factors that influence the water currents and rate and extent of the mixing of salt and fresh water. The influence of the morphology changes on flow conditions, on the penetration of salt into the estuary and on the water exchange in the estuaries in this paper are analysed on the example of the Odra Estuary. The morphology of the Odra Estuary, and specially the Świna Strait, has changed immensely since the beginning of the XVIII century. The analyses were performed on the basis of data from in situ measure-ments and results of calculations. For the calculation the three-dimensional model ESTURO was used, because of the complexity of the hydrodynamic regimes and their three-dimensional character. The calculations were performed for the three different hydro-meteorological conditions for each of the five analysed morphological situations of the Odra Estuary. Some results of calculations have been presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 3; 33-57
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability in the saline water exchange between the Baltic and the Gulf of Gdańsk by the σ-coordinate model
Autorzy:
Jankowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/48078.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
coastal zone
variability
thermohaline variability
water exchange
saline water
Baltic Sea
mass exchange
Gdansk Gulf
Opis:
A three-dimensional baroclinic σ–coordinate model was applied to study the circulation and thermohaline variability in the coastal zone in the south-eastern Baltic Sea. The model is based on the Princeton Ocean Model code of Blumberg & Mellor (1987), known as POM, and has the horizontal resolution of ∼5 km and 24 σ-levels in the vertical. The hydrodynamic conditions and variability of water and salt exchange between the Gulf of Gdańsk and the Baltic Proper, and the renewal of water masses in the Gulf of Gdańsk due to atmospheric forcing are analyzed. The numerical simulations were performed with real atmospheric forcings as well as with homogeneous (spatially uniform) wind fields over the whole Baltic Sea. The numerical simulations showed that the atmospheric forcing (winds) can play a significant role in shaping the renewal of bottom saline waters in the Gulf of Gdańsk. Two regions of inflow/outflow of saline waters responsible for the salinity regime were located. The overall water exchange between the Gulf and the Baltic Proper as well as the exchange of saline bottom waters appear to be strongly dependent on wind conditions. The net flux of water of salinity >9 PSU is of the order of 48 000–100000 m3 s−1. SE, E, S and NE winds were found to exert the greatest influence on salinity conditions in the Gulf of Gdańsk. Estimates of saline (salinity >9 PSU) water residence time based on the model simulation yielded values from 46 days for SE winds to 153 days for NW winds.
Źródło:
Oceanologia; 2003, 45, 1
0078-3234
Pojawia się w:
Oceanologia
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:
Exchange of water in the soil-plant-atmosphere system
Autorzy:
Kutilek, M.
Novak, V.
Powiązania:
https://bibliotekanauki.pl/articles/25010.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
evaporation
soil-plant-atmosphere system
water exchange
soil
atmosphere
evapotranspiration
plant
Źródło:
International Agrophysics; 1998, 12, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The pathway of the water exchange over the Gdansk-Gotland Sill of the Baltic Sea and its impact on habitat formation during the stagnation period
Autorzy:
Krek, A.
Gusev, A.
Krek, E.
Krechik, V.
Kapustina, M.
Kondrashov, A.
Dudkov, I.
Powiązania:
https://bibliotekanauki.pl/articles/2078932.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
water exchange
stagnation period
bottom layer
habitat
Gdansk-Gotland Sill
Baltic Sea
Opis:
Water exchange between the deep basins of the Baltic Sea during stagnation periods ventilates the bottom layer. Such exchange may be local and associated with the seabed topography features. The aim of this study is to investigate the possible pathway of water exchange within the Gdansk-Gotland ´ Sill. A comprehensive study was conducted near the one of the local erosional trenches (depressions), comprising bathymetric survey using multibeam echosounder, water column CTD-sounding, tilt current meters mooring, and sampling of seabed deposits and macrozoobenthos. The absence of pelitic sediments even in the natural trench depressions was identified. The seabed is composed of dense clays with surface erosion signs. The presence of a current towards the Gotland Basin was recorded in the bottom layer of the erosional trench. This layer was characterized by increased salinity and dissolved oxygen concentration. The trench was also an area with macrozoobenthos richer in species composition and biomass. Moreover, indicator species of the North Sea waters were found exclusively within the erosional trench. Macrozoobenthic community structure and the age of benthic organisms confirm the existence of permanent water exchange directly from the Słupsk Furrow through the erosional trench, and indicate one of the advective pathways of water exchange between the deep Baltic Sea basins.
Źródło:
Oceanologia; 2021, 63, 2; 163-178
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The history of coastal lakes studies with a special regard to Lake Gardno
Autorzy:
Paturej, E.
Powiązania:
https://bibliotekanauki.pl/articles/84791.pdf
Data publikacji:
2001
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
history
coastal lake
lake
Lake Gardno
Baltic Sea
coastal zone
water exchange
sea water
lake water
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2001, 05
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of temperature and salinity over the last decade in selected regions of the Southern Baltic Sea
Autorzy:
Rak, D.
Wieczorek, P.
Powiązania:
https://bibliotekanauki.pl/articles/48785.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
temperature
salinity
Southern Baltic Sea
trend
seasonal variability
physical property
water column
water exchange
water circulation
Opis:
Changes in the basic physical properties of selected areas of the Baltic Proper were analysed on the basis of the results of a 12-year series of high-resolution measurements collected during cruises of r/v ‘Oceania’. The high-resolution CTD sections covered three main basins: the Bornholm Basin, Słupsk Furrow and Gdańsk Basin. Positive temperature trends of 0.11 and 0.16◦C year−1 were observed in the surface and deep layers respectively. The salinity trend was also positive. The rise in the air temperature has probably caused the increase in surface water temperature, while advection has been of greater significance in the deep layer. The increase in salinity coincides with the more frequent occurrence of small and medium-size inflows through the Danish Straits, even though large inflows are evidently less frequent than used to be the case. The seasonal variability of temperature in the water column was analysed. The phase shift in the seasonal evolution with depth is described. The maximum temperature shift in the waters investigated varies from 32 to 38 days.
Źródło:
Oceanologia; 2012, 54, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent current oscillations and water exchange in the straits of the Gulf of Riga
Autorzy:
Talpsepp, L.
Powiązania:
https://bibliotekanauki.pl/articles/49149.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
current
water exchange
coherent current
Riga Gulf
Gulf of Riga Project
Baltic Sea
Opis:
The water exchange processes through the Irbe and Virtsu (Suur) Straits were investigated in 1993–1997 within the framework of a five-year study programme – the Gulf of Riga Project. Simultaneous current measurement data from autonomous mooring stations in both straits were available for the analysis in two periods. In addition to the dominant signals – inertial oscillations in the Virtsu Strait and diurnal oscillations in the Irbe Strait – low-frequency oscillations were found in both straits. During the experiment in July–August 1994, 12–14-day oscillations were observed in both straits: the maximum phase lag in the Virtsu Strait was 1 day. The other important low-frequency periodic component in both straits was 88 hours. In this case, the phase lag in the Virtsu Strait was about 20 hours. In the 1995 experiment in the Irbe Strait, 42-hour oscillations were observed with a phase lag of 10–12 hours. The amplitude was about 30 cm s−1 in both straits. As in Lilover et al. (1998), where the flow regime in the Irbe Strait was observed, we can interpret these oscillations as being wind-generated. The present work shows the existence of these disturbances also in the Virtsu Strait. The 88-hour oscillations observed in July–August 1994 can be interpreted as the first mode of the basin’s eigenoscillations according to the concept of Otsmann et al. (1997) of a basin with two separate outlets. The lowest frequency oscillation with the period of 12–14 days seemed to propagate to the Gulf of Riga from the Baltic Proper, but the generating force could not be established because there was no noticeable variability between depressions and anticyclones during that period. Based on the current measurements, two types of water exchange through the Irbe strait were established: the outflow over the whole cross-section of the strait, and a bidirectional flow with an inflow near the southern shore and increasing inflow in the near-bottom layers and an outflow in the northern part of the strait.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of the circulation, water exchange and water age properties of the Gulf of Bothnia
Autorzy:
Myrberg, K.
Andrejev, O.
Powiązania:
https://bibliotekanauki.pl/articles/48311.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Sopot
water exchange
Bothnia Gulf
mean circulation
conference
Baltic Sea
modelling
eutrophication
water age
Bothnian Bay
Opis:
To estimate the mean circulation, water exchange and water age in the Gulf of Bothnia a ten-year simulation using a three-dimensional numerical model was carried out. The results confirmed the early findings byWitting (1912) and Palm´en (1930) that a mean cyclonic circulation takes place both in the Bothnian Sea and in the Bothnian Bay. However, the modelling results showed clearly that there exist meso-scale circulation features including coastal ‘jets’, not reported in the Witting-Palm´en results. The simulated mean currents were also higher than those found earlier, while the persistency of this circulation is typically between 20 and 60%, which is similar to the earlier results. There is a large difference between the various model-based water-exchange estimates: these are strictly dependent on the time-averaging used. Water age proved to reflect properties of the mean circulation system, and the highest water age (of around 7.4 years) was found in the central part of the Bothnian Bay. The water age was found to be rather high also in the entire Gulf of Bothnia, which provides evidence of the rather slow water exchange between the Gulf and the Baltic Sea. This leads to the conclusion that, from the physical point of view, the Gulf of Bothnia is vulnerable to eutrophication.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distinctive features of water exchange across the Słupsk Sill (a full-scale experiment)
Autorzy:
Paka, V.
Golenko, N.
Korzh, A.
Powiązania:
https://bibliotekanauki.pl/articles/47795.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Sopot
water exchange
thermohaline structure
Slupsk Sill
saline water
conference
Baltic Sea
high-resolution transect
inflow water
brackish water
Opis:
The flows of brackish waters in the upper layer and saline waters in the lower layer meet above the Słupsk Sill, which makes this one of the most significant features of the Baltic Sea, controlling as it does the ventilation of the deep basins in its central region. Earlier high-resolution measurements using towed scanning probes conducted here for more than ten years had revealed the complexity and variability of the water dynamics in this area. Mapping surveys repeated in quick succession are needed to study the water exchange in such an area. A survey of this kind was attempted in October 2003 during the 57th cruise of the r/v ‘Professor Shtokman’. Three surveys were carried out in the areas of the Słupsk Sill, the eastern Bornholm Basin, and the western Słupsk Furrow by means of a scanning probe towed along closely-spaced transects. The water structure around the sill was different each time, despite the rather short time gaps between the surveys. As follows from the data analysis, during the first survey, the saline Bornholm waters flowed over the sill as an axially symmetrical jet and entrained the adjacent freshened cold waters of the intermediate layer. In ten days, this joint flow displaced to the southern flank of the sill and propagated in the Słupsk Furrow along its southern border, with the dense core of saline waters gradually moving over the bottom to the northern border. Concurrently, the contrary flow of the main volume of cold freshened waters, originating from northern areas and leaving the Baltic Sea, was pushed away from the southern wall of the furrow and blocked at a significant distance from the sill. In three days, the blocked waters forced their way through towards its northern flank. Just below these waters, waters of elevated salinity were found above the eastern slope of the sill at the depth of its ridge, while waters of a similar salinity occurred below the depth of the ridge above the western slope of the sill. There were no indications of intensive overflow in the central and southern areas of the sill. Accordingly, the return flow of Bornholm waters across the sill became possible.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of daily evapotranspiration rates obtained from water balance model and modified Bowens ratio method
Autorzy:
Olejnik, J.
Eulenstein, F.
Kedziora, A.
Werner, A.
Powiązania:
https://bibliotekanauki.pl/articles/25976.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
plant production
water exchange
earth surface
microclimatic condition
atmosphere
modelling
evapotranspiration
Bowen's ratio method
water balance model
Źródło:
International Agrophysics; 2001, 15, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the ballast water exchange sequence for an LNG carrier using a liquid cargo handling simulator
Wyznaczanie sekwencji wymiany wód balastowych gazowca LNG z wykorzystaniem symulatora ładunkowego statków do przewozu ładunków ciekłych
Autorzy:
Chorab, P.
Powiązania:
https://bibliotekanauki.pl/articles/360069.pdf
Data publikacji:
2011
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
balast
wymiana wód balastowych
gazowiec LNG
symulator LNG
ballast
ballast water exchange
LNG carrier
LNG simulator
Opis:
The sequential method of emptying and filling of ballast tanks at sea may pose extra threats for ship's safety. The prepared Ballast Water Management (BWM) Plan enables carrying out the operation so that negative effects of emptying each ballast tank are minimized. A large number of tanks and substantial volume of ballast water to be exchanged may create difficulties in preparing an optimized plan. The author proposes to use a liquid cargo handling simulator for the preparation of the BWM plan for selected LNG carriers.
W czasie opróżniania i napełniania zbiorników balastowych w morzu metodą sekwencyjną mogą pojawić się dodatkowe zagrożenia dotyczące bezpieczeństwa statku. Przygotowany wcześniej Plan Wymiany Wód Balastowych pozwala tak przeprowadzić operację, aby minimalizować negatywne skutki opróżniania zbiorników balastowych. Ich duża liczba i znaczna objętość wody balastowej może utrudniać przygotowanie optymalnego planu wymiany. Zaproponowano wykorzystanie symulatora ładunkowego do przewozu ładunków ciekłych w przygotowaniu takiego planu dla wybranych gazowców.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2011, 25 (97); 21-27
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodic variability of currents induced by topographically trapped waves in the coastal zone in the Gulf of Finland
Autorzy:
Talpsepp, L.
Powiązania:
https://bibliotekanauki.pl/articles/48759.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
trapped wave
Sopot
current
water exchange
Finland Gulf
topographical wave
Pakri Bay
conference
Baltic Sea
Estonia
Opis:
The aim of this paper is to examine the water exchange regime between the bays of northern Estonia (Pakri Bay, Ihasalu Bay and Muuga Bay) and the open part of the Gulf of Finland. To this end, the current measurements and CTD-castings performed at the border of the bays and the open part of the Gulf of Finland in summer 1994, 1995–96 and 1997 are analysed. All the current measurements displayed one feature in common: the existence of periodic variability with a current amplitude of between 5 and 25 cm s−1 and a variability period of 3–4 days (68 hours in Pakri Bay, 72 hours in Muuga Bay and 78 hours in Ihasalu Bay). The amplitudes of this variability differed during different time periods of the experiment and in different parts of the southern Gulf of Finland. The hypothesis was propounded that this variability is the result of bottom-trapped waves, as had been found in many other regions of the Baltic Sea (Aitsam & Talpsepp 1982, Talpsepp 1983). To interpret the results of the measurements, a model of bottom-trapped waves for this region was used. This was the short-wave version of Huthnance’s (1978) numerical model of coastal-trapped waves, according to which the wave parameters for the experimental regions were calculated. Comparison of the model and the measurements implies that coastal-trapped waves do exist off the southern coast of the Gulf of Finland.
Źródło:
Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sea water intrusions to the Lake Gardno
Intruzje wód morskich do jeziora Gardno
Autorzy:
Cieslinski, R.
Drwal, J.
Chlost, I.
Powiązania:
https://bibliotekanauki.pl/articles/85233.pdf
Data publikacji:
2009
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
sea water
intrusion
Lake Gardno
catchment
coastal lake
recipient
hydrographic structure
water relation
chloride concentration
lake water
chloride distribution
water exchange
sea
lake
Opis:
Lake Gardno, as the central object in the hydrographic structure, is under the influence of land and sea waters. This results in the situation where the lake together with its direct catchment forms a unique geoecosystem which differs from other inland reservoirs performing the role of local or regional recipients in hydrographic systems, in terms of the quality of water as well as the rate and dynamics of transformations occurring in it. This is an effect of overlapping influences of waters inflowing from the catchment and intrusions of sea waters. During intrusions, waters of higher salinity occur and remain during the greater part of the year in the whole water body of the lake, which is conditioned by the shape of the basin facilitating the penetration of salty waters. It was established that the water coming from intrusions remains for at least several days. There is also evidence from reconnaissance measurements that the retention is longer. The easiness of penetration and long retention period result in the fact that only periodically the desaltation effect of potamic waters leads to an almost complete desaltation of water in the whole basin of the lake Gardno.
W pracy podjęto próbę ustalenia czy w jeziorze Gardno dochodzi do intruzji wód morskich i czy skutki, które mogą one wywoływać są typowe dla jezior przybrzeżnych występujących na polskim wybrzeżu Południowego Bałtyku, czy też pod tym względem jest to jezioro wyjątkowe. Zastosowano metodę wykonywania na jeziorze powtarzalnych zdjęć hydrochemicznych z jednoczesnym określeniem aktualnej sytuacji hydrologicznej. W latach 2002- -2006 wykonano 16 serii pomiarów w 7 punktach zlokalizowanych na jeziorze Gardno. Próbki wody pobierano w warstwie powierzchniowej, naddennej oraz interstycjalnej. Wodę z tej ostatniej warstwy uzyskiwano z powierzchniowego osadu dennego pobranego pobierakiem Kajaka poprzez użycie wirówki Centrifuge. Próbki wody analizowano w laboratorium Katedry Hydrologii Uniwersytetu Gdańskiego. Stężenie chlorków określano metodą miareczkową. Poziom wody w jeziorze odczytywano na wodowskazie IMGW zlokalizowanym w Gardnie Wielkiej, natomiast poziom morza na wodowskazie Urzędu Morskiego w Porcie Rowy bądź w Ustce. Jezioro Gardno jako centralny obiekt w strukturze hydrograficznej jest pod wpływem wód lądowych i morskich. Powoduje to, że jezioro tworzy wraz ze swoja zlewnią bezpośrednią bardzo specyficzny geoekosystem, który wyróżnia od innych zbiorników śródlądowych pełniących w systemach hydrograficznych rolę odbiorników lokalnych czy regionalnych nie tylko jakość wód, ale przede wszystkim tempo i dynamika zachodzących w nim przemian. Jest to efekt nakładających się wpływów z jednej strony wód spływających ze zlewni, a z drugiej intruzji wód morskich. Podczas intruzji pojawiają się wody o podwyższonym zasoleniu. Utrzymuje się ono przez większą część roku w całym akwatorium jeziora, czemu sprzyja kształt misy ułatwiający penetrację wód słonych. Stwierdzono, że woda pochodząca z intruzji zalega co najmniej kilka dni. Są także przesłanki wynikające z przeprowadzonych pomiarów rekonesansowych wskazujące na to, że czas zalegania jest dłuższy. Łatwość penetracji i długi okres zalegania powodują, że tylko okresowo działanie wysładzające wód potamicznych doprowadza do prawie całkowitego wysłodzenia wody w całej niecce jeziora Gardno. Najczęściej to oddziaływanie wyraźnie widoczne jest tylko w południowej części zbiornika.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2009, 13 part I
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes regulating pCO2 in the surface waters of the Central Eastern Gotland Sea: a model study
Autorzy:
Kuznetsov, I.
Neumann, T.
Schneider, B.
Yakushev, E.
Powiązania:
https://bibliotekanauki.pl/articles/48971.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
biogeochemical modelling
brackish water
carbon dioxide
Cyanoprokaryota
detritus
ecological status
ecosystem
ERGOM model
nitrogen fixation
seasonal change
surface water
water exchange
Opis:
This work presents a one-dimensional simulation of the seasonal changes in CO2 partial pressure (pCO2). The results of the model were constrained using data from observations, which improved the model’s ability to estimate nitrogen fixation in the central Baltic Sea and allowed the impact of nitrogen fixation on the ecological state of the Baltic Sea to be studied. The model used here is the public domain water-column model GOTM (General Ocean Turbulence Model), which in this study was coupled with a modifed Baltic Sea ecosystem model, ERGOM (The Baltic Sea Research Institute’s ecosystem model). To estimate nitrogen fixation rates in the Gotland Sea, the ERGOM model was modified by including an additional cyanobacteria group able to fix nitrogen from March to June. Furthermore, the model was extended by a simple CO2 cycle. Variable C:P and N:P ratios, controlled by phosphate concentrations in ambient water, were used to represent cyanobacteria, detritus and sediment detritus. This approach improved the model’s ability to reproduce sea-surface phosphate and pCO2 dynamics. The resulting nitrogen fixation rates in 2005 for the two simulations, with and without the additional cyanobacteria group, were 259 and 278 mmol N m−2 year−1 respectively.
Źródło:
Oceanologia; 2011, 53, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 64

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