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Wyszukujesz frazę "Bengal Bay" wg kryterium: Temat


Wyświetlanie 1-13 z 13
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:
Seasonal influence of physico-chemical parameters on phytoplankton diversity, community structure and abundance at Parangipettai coastal waters, Bay of Bengal, South East Coast of India
Autorzy:
Vajravelu, M.
Martin, Y.
Ayyappan, S.
Mayakrishnan, M.
Powiązania:
https://bibliotekanauki.pl/articles/47903.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
community structure
abundance
seasonal variation
nutrient dynamics
physicochemical parameter
Parangipettai
coastal water
Bengal Bay
India coast
Źródło:
Oceanologia; 2018, 60, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the role of air-sea forcing on the variability of hydrography, circulation, and mixed layer depth in the Arabian Sea and Bay of Bengal
Autorzy:
Srivastava, A.
Dwivedi, S.
Mishra, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/48693.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
seasonal variability
hydrography
circulation
Arabian Sea
Bengal Bay
general circulation model
Źródło:
Oceanologia; 2018, 60, 2
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:
A study on chemical characterization and proximate composition of flathead mullet fish (Mugil cephalus) of estuarine region of the Bay of Bengal
Autorzy:
Rowshan-Ali, M.
Roni, M.A.H.
Haque, M.A.
Uddin, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/11517.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
chemical characteristics
proximate composition
flathead mullet
fish
Mugil cephalus
polyunsaturated fatty acid
estuarine habitat
Bengal Bay
Opis:
The Flathead mullet (Mugil cephalus) is a mullet of the genus Mugil in the family Mugilidae, found in coastal tropical, subtropical and estuarine water worldwide. Lipid was extracted from the muscle of Flathead mullet (Mugil cephalus) by solvent extraction method and characterized with respect to various chemical e.g. saponification value, saponification equivalent value, acid value, iodine value, peroxide value, ester value, thicyanogen value, unsaponifiable matter, Henher value, Polenske value, Reichert-Meissl value etc properties and compared with those of different oils. Palmitic acid, Stearic acid and Myristic acid were observed at fatty acid composition of the sample by chromatographic examination. Percentages of protein and mineral (N, P, K, Ca) in the muscle of Flathead mullet were studied by modified Kjeldahl method.
Źródło:
International Letters of Natural Sciences; 2014, 12, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
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:
Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
Autorzy:
Miranda, J.
Lotliker, A.A.
Baliareingh, S.K.
Jena, A.K.
Samanta, A.
Sahu, K.C.
Kumar, T.S.
Powiązania:
https://bibliotekanauki.pl/articles/2079007.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
size class
coastal water
long-term variability
satellite data
statistical analysis
Bengal Bay
Opis:
The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
Źródło:
Oceanologia; 2021, 63, 1; 40-50
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of riverine inputs, low saline plume advection and mesoscale physical processes in structuring the chlorophyll a distribution in the Western Bay of Bengal during Fall Inter Monsoon
Autorzy:
Loganathan, J.
Narasimha, R.D.
Joseph, I.
Parambil, A.M.
Rachuri, V.
Swarnaprava, B.
Kalathil, B.K.
Powiązania:
https://bibliotekanauki.pl/articles/2078870.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
river
tributary
advection
saline
mesoscale process
chlorophyll a
Bengal Bay
Opis:
This study delineates the role of small and medium river inputs, Low Saline Plume Advection (LSPA) and eddies in hydrography alteration and Chlorophyll a (Chl. a) in the Western Bay of Bengal. Samples were collected across five transects viz: Hooghly (HO), Mahanadi (MN), Rushikulya (RK), Visakhapatnam (VSKP) and Godavari (GD) during Fall Intermonsoon. Each transect consists of 7 or 8 locations from inshore to offshore. LSPA propagates southward concordance with the East India Coastal Current (EICC) and its southward flow strengthened by a cold-core eddy. LSPA results in the intermittent low salinity in the cross-shore section of HO, MN and RK. Upper layer Chl. a is 2—3 folds higher in inshore and in LSP-influenced locations than in its adjacent stations. The present study identified Double Chlorophyll a Maxima (DoCM) in LSPA-influenced slope regions of MN and RK. DoCM is less known in the BoB. DoCM has both the Surface Chl. a Maxima (SCM) and Subsurface Chl. a Maxima (SSCM). SSCM layer is relatively shallow and intense in slope and offshore regions of MN and RK due to their closeness with cold-core eddy. The present study highlights that freshwater discharge from small and medium rivers impacts hydrobiology around 10—50 km from the shore depends on the magnitude of river influx. LSPA is away from the local inputs and impacts hydrobiology (>500 km) along the path. EICC and eddies together regulated the direction of LSPA. Existing eddies nature alters vertical hydrobiology in slope and offshore regions.
Źródło:
Oceanologia; 2021, 63, 4; 403-419
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal
Autorzy:
Das, S.
Das, I.
Giri, S.
Chanda, A.
Maity, S.
Lotliker, A.A.
Kumar, T.S.
Akhand, A.
Hazra, S.
Powiązania:
https://bibliotekanauki.pl/articles/48552.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chromophoric dissolved organic matter
absorption coefficient
sea surface
salinity
chlorophyll a
total suspended matter
spatio-temporal variability
Bengal Bay
continental shelf
Opis:
The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of diatom and dinoflagellate cell volumes from surface waters of the Northern Indian Ocean
Autorzy:
Chitari, R.R.
Anil, A.C.
Powiązania:
https://bibliotekanauki.pl/articles/47851.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
diatom
dinoflagellate
cell size
surface water
microphytoplankton
seasonal variation
spatial variation
Indian Ocean
Bengal Bay
Arabian Sea
Opis:
Phytoplankton samples collected from the Northern Indian Ocean (Bay of Bengal, northern Arabian Sea, and Dona Paula Bay Goa, west coast of India), were utilized to quantify changes in cell size, cell volume and carbon per cell of diatoms and dinoflagellates. The dataset from the Bay of Bengal also provides inter- and intra-annual variations (April 2008 to March 2010). The variations in cell size and volume were large in regions influenced by the riverine influx or terrigenous inputs. An interregional comparison of commonly available forms (8 species) points out that cell volumes are highest in the North Atlantic and lowest in the Mediterranean. The information provided will be useful in estimation of carbon biomass and biogeochemical studies.
Źródło:
Oceanologia; 2017, 59, 3
0078-3234
Pojawia się w:
Oceanologia
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:
Coastal Eutrophication as a Cause of Elimination of Lugworms: First Record of Arenicola marina (Linnaeus, 1758) from Coastal Areas of Bay of Bengal at Chandipur, Odisha, India
Autorzy:
Chakrabarti, Santanu
Ray, Rupendu
Powiązania:
https://bibliotekanauki.pl/articles/1193614.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Arabian Sea
Arenicola
Arenicola marina
Bay of Bengal
Chandipur
India
Indian Ocean
Lugworm
Opis:
Arenicola marina (Linnaeus, 1758), a marine polychaete worm of the phylum Annelida is rarely seen but its coiled castings are a familiar sight on a beach at low tide of both northern and southern hemisphere. The genus Arenicola enjoys a wide distribution and in the tropical and sub-tropical regions A. cristata is the dominant species. Apart from a few records on the beaches of Indian Ocean and Arabian Sea the genus has not been known so far from any other part of India. In a study on the sandy as well as mudflats of Bay of Bengal at Chandipur in Odisha, India, we observed quite a big numbers of castings of Arenicola during the end of December, 2015 and accidentally found a full grown individual at the sandy beach. From that point of view it is the first report of its kind from this part of the globe, especially from Bay of Bengal, India.
Źródło:
World Scientific News; 2017, 71; 22-27
2392-2192
Pojawia się w:
World Scientific News
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
    Wyświetlanie 1-13 z 13

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