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Tytuł:
Investigating Microplastics in the Mediterranean Coastal Areas – Case Study of Al-Hoceima Bay, Morocco
Autorzy:
Achoukhi, Iliass
El Hammoudani, Yahya
Dimane, Fouad
Haboubi, Khadija
Bourjila, Abdelhak
Haboubi, Chaimae
Benaissa, Chaimae
Elabdouni, Aouatif
Faiz, Hatim
Powiązania:
https://bibliotekanauki.pl/articles/24201691.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Al-Hoceima bay
ATR-FTIR
microplastics
plastic
polymer
Opis:
The issue of microplastics pollution is gaining increasing attention as a global environmental concern. These tiny particles, measuring no more than 5 mm in size and coming in various shapes, can affect all types of marine eco-systems as they are easily consumed by a wide range of marine species. Al-Hoceima Bay, with its semi-enclosed nature and heavily affected anthropized coastline, was chosen as the study area for this research. The main objective was to investigate the presence of various microplastic types in Al-Hoceima Bay by implementing a sampling strategy along the coastline. This comprehensive approach was applied on a local scale within the bay (located in the northwest Mediterranean). Three stations were established in the bay, each located at different levels: the supralittoral, medilittoral and interlittoral. Microplastics were collected from these locations and classified into four categories based on their abundance. Digital microscopy was used to count the plastic particles and they were identified by Fourier transform-attenuated total reflectance infrared spectroscopy (ATR-FTIR). Results showed a higher presence of microplastics in water at 114 particles/L compared to sediment at 70 particles/L. The classification of samples revealed fibers as the most prevalent form, followed by fragments and films being the least commonly found. The abundance of fibers was found to be higher in water 90%, while in sediment it was 31%, however, fragments and leaves were found in higher concentrations in sediment. Polypropylene and polyethylene were identified as the major polymers used in the microplastics analyzed.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 176--190
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Człowiek, przestrzeń i natura. Boka Kotorska w prozie Nikoli Malovicia
Man, Space and Nature. The Bay of Kotor in the Prose of Nikola Malović
Autorzy:
Nowak-Bajcar, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/15587391.pdf
Data publikacji:
2022-11-14
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
The Bay of Kotor
literary topography
the identity of the place
dystopia
eutopia
traditional ecological knowledge
Opis:
The article presents the imaginary structure of The Bay of Kotor in selected works ( the novels: Latajući Bokelj [Wandering Bokelj], Jedro nade [Sail of Hope] and the collection of short stories Prugastoplave storije [Striped Blue Stories]) by Nikola Malović, as well as the issues of ideological consequences of this literary creation, in which the region becomes a metonymy for the problems of the modern world. The story of the Bokelian identityis a story about rooting, about space treated as oikos, and about a man as one of the elements of this system. In Malović’s reflection, the awareness of the writer’s place of origin is combined with the awarenessof responsibility for it. Looking for the disastrous consequences for humans in the interdependence between power ( politics ) and knowledge ( civilization development ), in returning to the tradition and experiences of ancestors, he sees an antidote to the devastating activity of man, which links this concept with the current of research referred to as traditional ecological knowledge.
Źródło:
Poznańskie Studia Slawistyczne; 2022, 22; 217-236
2084-3011
Pojawia się w:
Poznańskie Studia Slawistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regional management of the Bay of Bengal water area. The challenges of maritime security
Autorzy:
Yeasmin, Nafisa
Tkach, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/1991073.pdf
Data publikacji:
2022-01-01
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
Bay of Bengal
maritime security
regional cooperation
due diligence
Opis:
The Bay of Bengal is the largest bay in the world that forms the northeastern part of the Indian Ocean, bordered mostly by the Eastern Coast of India, southern coast of Bangladesh and Sri Lanka to the west and Myanmar and the Andaman and Nicobar Islands (part of India) to the east. The regional management of the Bay of Bengal water area is performed by regional organisations such as ASEAN, SAARC, BIMSTEC and IORA unifying Bay’s coastal states. Nevertheless, differences in political and economic interests of the states, separate conflicts between states and consequences of the pandemic not only challenged the integrity of the regional management but also led to rising insecurity of the Bay of Bengal and fears to navigate in that area. In this article, the authors, in a more detailed way, will disclose existing regional management systems, concerns related to maritime security and give recommendations on how to increase efficiency in collective management of maritime security issues and how the concept of due diligence may play the vital role in the regulation of not only maritime security aspects but also aspects of environmental protection and potential transition to the blue economy.
Źródło:
Academicus International Scientific Journal; 2022, 13, 25; 104-121
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Distribution and Diversity of Marine Zooplankton Adjacent to the St. Martins Island, Bangladesh
Autorzy:
Alam, Md. Jobaer
Kamal, A. S. M. Maksud
Ahmed, Md. Kawser
Khondker, Moniruzzaman
Fayyaz, Rafid
Powiązania:
https://bibliotekanauki.pl/articles/2202173.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
zooplankton
spatial distribution
abundance
richness
diversity
Bay of Bengal
St. Martin's Island
coastal water
Opis:
Bangladesh, a country that lies on the north shores of the Bay of Bengal, has been blessed with a plethora of natural resources. St. Martin’s Island, the only coral-bearing island in Bangladesh, is undoubtedly regarded as one of the most prized possessions. It is rich in biodiversity, but truly scientific information on it is lacking. In the present investigation, 14 stations adjacent to St. Martin’s Island within the Bay of Bengal were sampled for determining the composition, spatial distribution, species richness, and diversity of pelagic zooplankton. Samples were collected in the pre-monsoon hot season. From the community of zooplankton, 34 species were reported. Most of the species belonged to copepods. Besides, Polychaeta and Cirripedia were also present in the community. The most significant species belonged to Oithona, Canthocalanus, Balanus, Euterpina, and Microsetella. Total zooplankton standing crop varied from 45,000–125,000 ind/m3 and the highest number of species (8) were observed at station 7. Strong variability in the distribution of species was observed in the studied stations. The number of genera collected at each station varied from 4–8. Data on species richness (Df) varied from 1.30–3.04 and that of the Shannon-Wiener Index (H) from 1.33–1.93. The species composition of zooplankton and the species richness and the diversity index of the population was comparable to the other studies carried out in the Central and Western Bay of Bengal.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 154--163
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a sheltered euhaline area of the Southeastern Bay of Biscay to sustain bivalve production in terms of phytoplankton community composition
Autorzy:
Bilbao, J.
Muniz, O.
Rodriguez, J.G.
Revilla, M.
Laza-Matinez, A.
Seoane, S.
Powiązania:
https://bibliotekanauki.pl/articles/2078991.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton community
phytoplankton composition
biomass
physicochemical variation
aquaculture
mussel
Biscay Bay
Opis:
This study describes the phytoplankton community in sheltered euhaline waters of the Basque coast (southeastern Bay of Biscay). Phytoplankton composition, cell size, abundance, biomass and the presence of potentially toxic taxa, together with chlorophyll a, nutrients and hydrographic and optical conditions were measured, from August 2016 to August 2017, in the Mutriku port, with the main aim of assessing the suitability of the phytoplankton community as a food resource for bivalves. The water column in Mutriku showed the typical environmental conditions of Basque marine waters, with no significant nutrient enrichment caused by anthropogenic pressures. Haptophytes represented the greatest contribution to cell abundance (31—47%), and diatoms were the dominant group in terms of biomass (52—79%), which could favour mussel growth due to their high fatty acid content. In addition, the size structure of the phytoplankton community was suitable for mussel ingestion, since the predominant cell size was 2—20 μm. Regarding toxic phytoplankton, the genera that pose a risk for human health and those that affect negatively mussel physiology and survival were considered. Altogether, ten toxic phytoplankton taxa were identified, contributing in less than 5% to the total cell abundance of Mutriku. However, median chlorophyll a concentration was low (0.5 μg L−1), reflecting the oligotrophic conditions of the area. Therefore, even if the composition of the phytoplankton community could be favourable for bivalve aquaculture, biomass values are low compared to other zones of bivalve production.
Źródło:
Oceanologia; 2021, 63, 1; 12-26
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cantrang: A Dilemma in Policy Implementation (Case in Lampung Bay, Indonesia)
Sieć trałowa: Dylemat we wdrażaniu polityki (przypadek zatoki Lampung w Indonezji)
Autorzy:
Febryano, Indra Gumay
Supono, -
Damai, Abdullah Aman
Hardian, Debi
Winarno, Gunardi Djoko
Tresiana, Novita
Powiązania:
https://bibliotekanauki.pl/articles/1841006.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
fishing gear
IUU fishing
Lampung Bay
policy implementation
cantrang
sprzęt połowowy
połowy IUU
Zatoka Lampung
wdrażanie polityki
sieć trałowa
Opis:
Cantrang is a section of seine nets which has been banned in all regions of Indonesia. However, this policy can stir to pros and cons due to implementation. The purpose of this study is to analyze the success of the stage and the effectiveness of policy implementation on cantrang prohibition in Lampung Bay, Indonesia. Data were collected by interview, observation, and documentation studies, next the policy implementation was reviewed by the marketing policy studies then for further analyze was using ambiguity-conflict matrix. The result of this research shows the unsuccessful of the policy marketing on implementing cantrang prohibition policy from policy acceptance side and policy adoption, also on readiness strategy side is failed. Fisher community do not fulfil the policy and not become a part of it, hesitancy of local government as an executor of the policy, vertical conflict between fisherman and government. The analysis of ambiguity-conflict matrix gives the choice of effectiveness politic model implementation and experimentation, replace the administrative policy implementation. Effective but non-destructive fishing gear can be encouraged to be developed by the government through studies that involving all stakeholders including fisherman and academics. The government is also expected to replace the prohibition policy with a regulatory policy on the cantrang construction and capture area arrangement. In addition, the government is expected to create legal certainty in the field, so it may minimize the fisherman’s conflicts and opposition to cantrang prohibition policies.
Kantrang to sieć trałowa, której użytkowania zakazano we wszystkich regionach Indonezji. Jej wdrażanie ma jednak tak wady, jak i zalety. Celem niniejszej pracy jest analiza sukcesu i skuteczności wdrażania polityki dotyczącej zakazu kantrangu w zatoce Lampung w Indonezji. Dane zebrano na podstawie wywiadów, obserwacji i badań dokumentacji, a następnie wdrożenie polityki zostało przeanalizowane z pozycji polityki marketingowej, po czym do dalszej analizy wykorzystano macierz niejednoznaczności-konfliktu. Wyniki tych badań pokazują, że marketing dotyczący wdrażania polityki zakazu kantrang od strony jej akceptacji i przyjęcia, a także od strony gotowości jej wdrażania, nie powiódł się. Społeczność rybacka nie realizuje polityki i nie staje się jej częścią, samorząd jako wykonawca polityki także zawodzi, następuje wertykalny konflikt między rybakami a rządem. Analiza macierzy niejednoznaczności konfliktu wskazuje na możliwości poprawy skuteczności wdrażania modelu politycznego i przygotowania nowej polityki administracyjnej. Rząd może zachęcać do opracowywania skutecznych, ale nieniszczących narzędzi połowowych opracowanych z udziałem wszystkich zainteresowanych stron, w tym rybaków i naukowców. Oczekuje się również, że rząd zastąpi politykę zakazową polityką regulacyjną dotyczącą dopuszczalnych form budowy sieci kantrangu i jej zdolności połowowych. Ponadto oczekuje się, że rząd stworzy skuteczne prawa w tej dziedzinie, dzięki czemu zmniejszeniu ulegnie zakres sprzeciwu wobec polityki zakazu kantrangu.
Źródło:
Problemy Ekorozwoju; 2021, 16, 1; 133-142
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coastal sandy spit deposits (Lower Burdigalian/Eggenburgian) in the Alpine-Carpathian Foredeep of Lower Austria
Autorzy:
Nehyba, Slavomír
Roetzel, Reinhard
Powiązania:
https://bibliotekanauki.pl/articles/2058681.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Alpine-Carpathian Foredeep
Early Miocene
Eggenburg Bay
coastal spit
provenance analysis
Opis:
In the type-area of the Eggenburgian regional stage (Lower Burdigalian) sands with large-scale clinoforms were studied north-west of Eggenburg (Lower Austria). Stratigraphic and facies architecture, palaeocurrent pattern and inferred palaeogeographic setting show that these sands are deposits of W-E trending and SW to SSE prograding coastal spit systems, attached to crystalline shoals or islets in the shallow marine Eggenburg Bay. The spits were dominantly formed by shoal parallel accretion above fair-weather wave base due to longshore transport. The 4-5 m thick clinoforms with bottomset, foreset and topset structures contain up to 3.6 m thick, steeply inclined foresets, dominated by sediment gravity-flow deposition. Relatively stable depositional conditions, characterized by strong unidirectional currents, high sand supply and sufficient accommodation space are assumed for their formation. However, internal reactivation surfaces indicate variations in current activity, orientation and velocity. The deposits of spit systems are interpreted as part of a transgressive systems tract. The provenance analysis reveals the local Moravian and Moldanubian crystalline rocks as principal source. The spit sands of the Burgschleinitz Formation show the highest mineralogical maturity within the studied Lower Miocene succession. Intense reworking and redeposition of material from older deposits is evident. Due to the ongoing transgression deposits of the following Gauderndorf Formation and Zogelsdorf Formation exhibit a larger catchment area with input of high amounts of fresh weathered material.
Źródło:
Geological Quarterly; 2021, 65, 4; 40--70
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Debris Drift from Estuaries: A Study Case in Muara Gembong, Jakarta Bay
Autorzy:
Purba, Noir P.
Faizal, Ibnu
Sayyid, Kemaal
Powiązania:
https://bibliotekanauki.pl/articles/1193480.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Citarum River
Jakarta Bay
Lagrangian
Marine debris
Muara Gembong
Plastics
Opis:
Citarum River is one of the largest rivers in West Java, Indonesia. With a length of 297 km, it transfers the debris from the urban area, industry, and settlement to the ocean. This research aims to explore Marine Debris (MD) trajectories from two estuaries in Jakarta Bay. The method was included lagrangian particles with ocean currents, wind, and bathymetry conditions using GNOME software. There were three classes of simulation done in this research. MD observations were conducted in mangrove areas to validate the simulations. These simulations occurred during the northwest and southeast Monsoon period. The results showed that the debris trajectory patterns vary in the two monsoons, and waste from the two estuaries flow towards the south and southwest. In NWM, more waste moved further to the south and was stranded in the surrounding coastal areas. In SEM, waste moved towards the Jakarta bay and surrounding islands in the western and southern side of the estuaries. MD, especially the ones from Jaya estuary, affect other areas.
Źródło:
World Scientific News; 2021, 158; 173-186
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and extent of benthic habitats in Puck Bay (Gulf of Gdansk, Southern Baltic Sea)
Autorzy:
Sokolowski, A.
Jankowska, E.
Balazy, P.
Jedruch, A.
Powiązania:
https://bibliotekanauki.pl/articles/2078880.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
benthic habitat
Puck Bay
Gdansk Gulf
Baltic Sea
biological value
aesthetic value
ecosystem
maritime spatial planning
sustainable management
coastal environment
Opis:
The majority of the southern Baltic Sea seabed encompasses homogenous softbottom sediments of limited productivity and low biological diversity, but shallow productive areas in the coastal zone such as wetlands, vegetated lagoons and sheltered bays show a high variety of benthic habitat types offering favourable biotopic conditions for benthic fauna. Within Polish marine areas, semi-enclosed Puck Bay (the western part of the Gulf of Gdansk) ´ features an exceptionally diverse environment covering a range of benthic habitats which underscores its unique biological value and aesthetic quality and providing an impetus for conservation and ecosystem-based development. Full-coverages maps on benthic habitats in this area are therefore a necessary foundation for maritime spatial planning and implementation of strategies for sustainable management and protection of the coastal environment. This study presents the first comprehensive description and distribution of benthic habitats in Puck Bay which were categorised using the revised EUNIS 2019 classification system. Typological analyses were carried out based on inventory datasets from 1995 to 2019 including scientific publications, satellite images, open databases, topographic and geological maps, reports, theses, information available on websites and unpublished data shared willingly by individual researchers and administrative institutions. Collating various spatial data sources, that were first georeferenced and then visualized using techniques available in ArcMap 10.4.1 software (Esri), resulted in the mapping of benthic habitats and sites of important and protected plant species, which can contribute to the high confidence in environmental assessments and monitoring activities.
Źródło:
Oceanologia; 2021, 63, 3; 301-320
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report of Protoperidinium steinii (Dinophyceae) bloom from the coastal marine ecosystem - an observation from tropical Indian waters
Autorzy:
Sathishkumar, R.S.
Sahu, G.
Mohanty, A.K.
Arunachalam, K.D.
Venkatesan, R.
Powiązania:
https://bibliotekanauki.pl/articles/2078883.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Protoperidinium steinii
Dinophyceae
bloom
marine ecosystem
coastal ecosystem
red tide
eutrophication
backwater
Bengal Bay
India
Opis:
A dense bloom of Protoperidinium steinii was observed in the backwaters adjoining the western Bay of Bengal, Kalpakkam coast, which might be the first report for the world oceans. The brownish-red bloom appeared on 2 October 2019, and it was monitored on alternate days up to 14 October. Surface water temperature was about 27.5°C and salinity was <17 PSU during the bloom. Dissolved inorganic nutrients like nitrate, ammonia, silicate, and phosphate were extremely high compared to that of the coastal waters. The chlorophyll-a maxima (20.95 mg m−3) coincided with the highest Protoperidinium density (113.9 × 104 cells l −1). The contribution of P. steinii ranged from 17−93% of the total phytoplankton population. Since P. steinii is a heterotroph and voracious grazer, low autotroph density was observed during the bloom. No mass mortality of fish or other organisms was observed, thereby indicating the nontoxic nature of the bloom
Źródło:
Oceanologia; 2021, 63, 3; 391-402
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy Metal Contamination in Sediments and Its Potential Ecological Risks in Youtefa Bay, Papua Province, Indonesia
Autorzy:
Hamuna, Baigo
Wanimbo, Efray
Powiązania:
https://bibliotekanauki.pl/articles/1955507.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ecological risk
pollution load index
geo-accumulation index
contamination factor
threshold effect level
Youtefa Bay
Opis:
This study aimed to analyze the heavy metal contamination in sediments and their potential ecological risks. The sediment samples were collected using PVC pipes and grab samplers at nine study sites in Youtefa Bay, namely five sites in the mangrove ecosystem, two sites in the estuary, and two sites in the middle of the bay. The heavy metal content was analyzed using Atomic Absorption Spectrophotometry. The results of the analysis of the heavy metal content in the sediment were in the following order: Zn > Cu > Pb > Ni > Cr > Cd > As > Hg (106.077±98.857, 28.553±30.505, 19.798±11.541, 17.665±11.457, 12.103±0.124, 2.996±1.235, 0.149±0.124, and 0.082±0.047 mg kg-1, respectively). Only the Cd content has exceeded the Threshold Effect Level (TEL) at all study sites. On the other hand, the As and Cr content has not exceeded TEL at any study site. The content of Hg, Cr, Pb, Zn, and Ni has exceeded TEL only at a few study sites. The heavy metal content in estuary sites is higher than in mid-bay and mangrove sites, which can provide the information on the sources of heavy metal contaminants. There is a significant correlation for the content of Cu, As, Pb, Cd, Zn, and Ni which can indicate that the sources of these heavy metals are relatively the same (r = 0.569 to r = 0.950). The CF and Igeo values indicate that there has been contamination of several heavy metals studied. Further analysis ( ERI ) showed that the heavy metal content in the sediments poses a potentially serious ecological risk. Most of the potential ecological risks are the contribution of Cd and Hg which have high toxicity factors and this should receive special attention from local governments and stakeholders to prevent higher contamination.
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 209-221
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microplankton size structure induced by a warm-core eddy in the Western Bay of Bengal: Role of Trichodesmium abundance
Autorzy:
Chinnadurai, K.
Retnamma, J.
Nagarathinam, A.
Subramanian, P.R.
Singaram, P.
Shoba, S.
Powiązania:
https://bibliotekanauki.pl/articles/2078908.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
microplankton
size structure
biomass
Trichodesmium
sea surface temperature
wind
sea level
geostrophic current circulation
chlorophyll a
Bengal Bay
Opis:
Mesoscale warm-core eddies are common in the Bay of Bengal (BoB), and this study in the western BoB during Pre-Southwest Monsoon (April 2015) presents how a prolonged warmcore core eddy could modify the microplankton biomass and size structure. To investigate this, field sampling and laboratory analyses were augmented with satellite data sets of sea surface temperature (SST), winds, mean sea level anomaly (MSLA), geostrophic currents and chlorophyll-a. High SST with positive MSLA (≥ 20 cm) and a clockwise circulation, represented the occurrence of a large warm-core eddy in the western BoB. Time series data evidenced that it was originated in the mid of March and persistent there till early June, which in turn caused a decrease in the surface nutrients and chlorophyll-a. The abundance and biomass of microplankton were negligible in the warm-core eddy region. FlowCAM data showed a significant decrease in the autotrophic microplankton parameters in the warm-core eddy (av. 13 ± 9 ind. L−1 and 0.1 ± 0.04 μgC L−1, respectively) as compared to the surrounding locations (av. 227 ± 143 ind. L−1 and 0.8 ± 0.5 μgC L−1, respectively). Low nutrients level in the warm core eddy region favoured high abundance of needle-shaped phytoplankton cells dominated by Trichodesmium cells. As a result, the size of micro-autotrophs in the warm-core eddy was larger (av. 91,760 ± 12,902 μm3 ind.−1) than its outside (av. 50,115 ± 21,578 μm3 ind.−1). This is a deviation from our belief that the oligotrophy decreases the phytoplankton size. We showed here that the above understanding might not be infallible in warm-core eddies in the northern Indian Ocean due to its inducing effect on the Trichodesmium abundance.
Źródło:
Oceanologia; 2021, 63, 3; 283-300
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified integer model for solving the master bay problem
Autorzy:
Tsymbal, M.
Kamieniev, K.
Powiązania:
https://bibliotekanauki.pl/articles/2063952.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ship operation problem
master bay problem
integer model
modified integer model
genetic algorithm
steady-state genetic algorithm
numerical experiment
feasibility study
Opis:
One of key components in keeping a ship seaworthy is a correctly prepared cargo plan. Considering the recent cost cutting measures and reduced transportation volumes relevance of optimizing such a plan cannot be understated. Though there’s a number of studies addressing the issue none of them covers all the operational and constructional constraints necessary to factor for. This article presents an integer model that tries to address some of the constraints missed by other researches. A method for solving the model is designed and developed based on a steady-state genetic algorithm. A numerical experiment is conducted showing the method’s feasibility.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 749--753
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocean fronts detection over the Bay of Bengal using changepoint algorithms - A non-parametric approach
Autorzy:
Reddem, V.S.
Muthalagu, R.
Bekkam, V.R.
Eluri, P.R.R.
Jampana, V.
Nimit, K.
Powiązania:
https://bibliotekanauki.pl/articles/2078823.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
ocean front
detection
satellite image
change point analysis
algorithm
advanced very high resolution radiometer
Bengal Bay
Opis:
Oceanic fronts are regions over the oceans where a significant change in the characteristics of the water masses is observed. Advanced Very High Resolution Radiometer (AVHRR) satellite imagery over the Bay of Bengal shows regions that are populated by frontal structures. Over the Bay of Bengal, some of the strongest gradients in temperature and salinity are observed. In recent years, there has been a tremendous growth in the availability of satellite imagery and the necessity of automated fast detection of the frontal features is needed for services like potential fishing zones over open oceans. In this article, an algorithm to infer oceanic fronts over the Bay of Bengal is described using changepoint analysis. The changepoint algorithm is combined in a novel way with a contextual median filter to detect frontal features in AVHRR imagery. The changepoint analysis is a non-parametric technique that does not put thresholds on the gradients of brightness temperatures of the satellite imagery. In the open oceans, the gradients of temperature and salinity are not sharp and changepoint analysis is found to be a useful complementary technique to the existing front detecting methods when combined with contextual median filters.
Źródło:
Oceanologia; 2021, 63, 4; 438-477
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pore Water Nutrient Profile in the First and Second Transitional Season in Teluk Ciletuh, Sukabumi District, West Java
Autorzy:
Efendi, Hilmi Miftah Fauzi
Yuniarti, Yuniarti
Syamsudin, Mega Laksmini
Ihsaan, Yudi Nurul
Powiązania:
https://bibliotekanauki.pl/articles/1193298.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ciletuh Bay
Nutrients
Transitional Season
Water Quality Parameters
Opis:
The purpose of this research conducted between October 2018 and April 2019 was to determine the effect of the first and second transitional season on the nutrient profile in Ciletuh Bay. The data used in this research and directly taken from the research site were seawater quality parameters, analysis of granulometry sample and analysis of nutrient profile, while all data processing was conducted in a laboratory. The method used in this study was purposive sampling. The results of this research indicated that the nutrient profile in the first transitional season is higher than the second transition season. This is due to the introduction of organic matter into the waters. From this research it can be concluded that the first transitional season affects the concentration of nutrient in Ciletuh Bay.
Źródło:
World Scientific News; 2021, 153, 2; 43-54
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 215

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