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Tytuł:
Acoustic Identification of Dolphin Whistle Types in Deep Waters of Arabian Sea Using Wavelet Threshold Denoising Approach
Autorzy:
Mahanty, Madan Mohan
Cheenankandy, Sanjana M.
Latha, Ganesan
Raghuraman, Govindan
Venkatesan, Ramasamy
Powiązania:
https://bibliotekanauki.pl/articles/31339921.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
deep water ambient noise
Arabian Sea
wavelet threshold denoising
impulsive shackle noise
dolphin whistle types
Opis:
In situ time series measurements of ocean ambient noise, have been made in deep waters of the Arabian Sea, using an autonomous passive acoustic monitoring system deployed as part of the Ocean Moored buoy network in the Northern Indian Ocean (OMNI) buoy mooring operated by the National Institute of Ocean Technology (NIOT), in Chennai during November 2018 to November 2019. The analysis of ambient noise records during the spring (April–June) showed the presence of dolphin whistles but contaminated by unwanted impulsive shackle noise. The frequency contours of the dolphin whistles occur in narrow band in the range 4–16 kHz. However, the unwanted impulsive shackle noise occurs in broad band with the noise level higher by ~20 dB over the dolphin signals, and it reduces the quality of dolphin whistles. A wavelet based threshold denoising technique followed by a subtraction method is implemented. Reduction of unwanted shackle noise is effectively done and different dolphin whistle types are identified. This wavelet denoising approach is demonstrated for extraction of dolphin whistles in the presence of challenging impulsive shackle noise. Furthermore, this study should be useful for identifying other cetacean species when the signal of interest is interrupted by unwanted mechanical noise.
Źródło:
Archives of Acoustics; 2023, 48, 1; 39-48
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbial and chemical quality assessment of the small rivers entering the South Baltic. Part II : Case study on the watercourses in the Puck Bay catchment area
Mikrobiologiczna i chemiczna ocena jakości małych rzek uchodzących do Południowego Bałtyku. Część II : Analiza cieków wodnych w zlewni Zatoki Puckiej
Autorzy:
Bączkowska, Emilia
Kalinowska, Agnieszka
Ronda, Oskar
Bray, Rafał
Płóciennik, Bartosz
Polkowska, Żaneta
Powiązania:
https://bibliotekanauki.pl/articles/2173784.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Baltic Sea
water pollution
coastal rivers
microbiological quality monitoring
chemical quality monitoring
fecal coliforms
coastal management
morze Bałtyckie
zanieczyszczenie wody
rzeki przybrzeżne
monitorowanie jakości mikrobiologicznej
monitorowanie jakości chemicznej
bakterie coli w kale
zarządzanie wybrzeżem
Opis:
Due to its location, Puck Bay is an area particularly vulnerable to pollution of anthropogenic origin. The aim of the study was to assess the water quality of small watercourses entering the inner part of Puck Bay. The paper presents the results of chemical and microbiological analyses of 10 rivers and canals at their estuaries located on the western shore of the internal Puck Bay. The following environmental parameters were analyzed: conductivity, pH, dissolved oxygen concentration (in situ measurements), COD (cuvette tests), concentrations of ions (ion chromatography). Microbiological analysis included assessment of sanitary condition based on the number of fecal coliforms by a cultivation method. The determination of basic microbiological parameters such as: prokaryotic cell abundance expressed as total cells number (TCN), prokaryotic cell biovolume expressed as average cell volume (ACV), the prokaryotic biomass (PB) and prokaryotic cell morphotype diversity were determined using epifluorescence microscopy method. Based on the obtained results, it was found that small watercourses may carry a notable load of anthropogenic pollution and thus affect the environment of Puck Bay. The results clearly indicate the need for quality monitoring in the rivers and canals in the Coastal Landscape Park, flowing into Puck Bay. The research showed that also smaller watercourses may have an impact on the coastal waters’ state, and thus on the Baltic Sea water quality.
Zatoka Pucka, ze względu na swoje położenie, jest obszarem szczególnie narażonym na zanieczyszczenia pochodzenia antropogenicznego. Celem pracy była ocena jakości wód małych cieków wodnych uchodzących do wewnętrznej części Zatoki Puckiej. W pracy przedstawiono wyniki analiz chemicznych i mikrobiologicznych 10 rzek i kanałów w ujściach zlokalizowanych na zachodnim brzegu wewnętrznej Zatoki Puckiej. Analizie poddano następujące parametry środowiskowe: przewodność, pH, stężenie tlenu rozpuszczonego (pomiary in situ), ChZT (testy kuwetowe), stężenie jonów (chromatografia jonowa). Analiza mikrobiologiczna obejmowała ocenę stanu sanitarnego na podstawie liczby bakterii grupy coli typu kałowego metodą hodowlaną. Oznaczenia parametrów mikrobiologicznych takich jak: liczebność komórek prokariotycznych, średnia objętość komórek, biomasa oraz zróżnicowanie morfotypowe komórek prokariotycznych określono metodą mikroskopii epifluorescencyjnej. Na podstawie uzyskanych wyników stwierdzono, że małe cieki mogą przenosić znaczny ładunek zanieczyszczeń antropogenicznych i tym samym wpływać na środowisko Zatoki Puckiej. Uzyskane wyniki jednoznacznie wskazują na potrzebę prowadzenia monitoringu jakości rzek i kanałów w Nadmorskim Parku Krajobrazowym uchodzących do Zatoki Puckiej. Z badań wynika, że również mniejsze cieki mogą mieć wpływ na stan wód przybrzeżnych, a tym samym na jakość wód Morza Bałtyckiego.
Źródło:
Archives of Environmental Protection; 2022, 48, 1; 58--74
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water and Fire – The History of a Mound of Ash: Water Management in Hellenistic Berenike, Its Environmental and Logistical Setting
Autorzy:
Woźniak, Marek A.
Popławski, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/2180001.pdf
Data publikacji:
2022-12-31
Wydawca:
Polska Akademia Nauk. Instytut Kultur Śródziemnomorskich i Orientalnych PAN
Tematy:
Hellenistic bath
water supply
Red Sea
Graeco-Roman harbour cities
the ancient Spice Route
Hellenistic Egypt
Opis:
Archaeological work since 2014 in the Hellenistic areas of Berenike, a key port on Egypt’s Red Sea coast, founded by Ptolemy II Philadelphus in c. 275 BC, has brought extensive evidence of water-related structures: a rock-cut well located inside a rebuilt early-Hellenistic gate and a nearby cistern with an associated rainwater-collection system, that has changed the way in which the sources and uses of water in Hellenistic Berenike is understood today. The research started with the excavation of an ash mound, a characteristic landmark in the western part of the site, which is now believed to be the rubbish dump from the furnace that heated a Hellenistic bathhouse. At this stage in the research, it can be argued that Hellenistic Berenike had sufficient water available on site not only for drinking (hence potable), and agricultural and industrial uses, but also for public bathing. This article summarises the current state of research, presenting recent discoveries of a Hellenistic date at the site within their archaeological, architectural and environmental contexts.
Źródło:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences); 2022, 35; 163-187
2084-6762
2449-9579
Pojawia się w:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A system for the determination of surface water pCO2 in a highly variable environment, exemplified in the Southern Baltic Sea
Autorzy:
Stokowski, M.
Makuch, P.
Rutkowski, K.
Wichorowski, M.
Kulinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2078920.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
surface water
carbon dioxide
coastal zone
environment change
inorganic carbon
open water
Baltic Sea
Opis:
Measurement of pCO2 in highly dynamic coastal zones such as the southern Baltic Sea presents many challenges. In this study, we designed a system to measure pCO2 and then validated it in a series of laboratory and seagoing tests. The fast response time of the system was shown to provide a better resolution of CO2 system gradients. In the open waters of the Baltic Sea, the accuracy of the pCO2 measurements (±1.3 μatm) met the requirements of the ICOS (±2.0 μatm). In the coastal zone, there was less consistency between pCO2, DIC and pH measurements, suggesting the need to redefine the quality assurance and control requirements for the measurement of pCO2 in dynamic regions.
Źródło:
Oceanologia; 2021, 63, 2; 276-282
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Assessment of Progress in the Implementation of the BWM Convention on Ships as an Important Element in Protecting Aquatic Ecosystems
Autorzy:
Zatoń-Sieczka, Kinga
Czerniejewski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2069921.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
ballast water
foreign species
BWM convention
ballast water treatment
sea transport
Opis:
The purpose of this study was to assess progress in the implementation of rules for the control and handling of ballast water and sediments, regulated by the International Convention on the Control and Handling of Ship Ballast Water and Sediments (BWM Convention). The survey was conducted in 2018-2019 among seafarers responsible for handling ballast tanks. Analysis of the survey data revealed that despite the introduction of water treatments, ballast water continues to be a vector for the transfer of non-native organisms. This is due to the low effectiveness of the methods used, and the fact that 8% of the respondents answered that no BWT systems were used on the ships they manage. Despite this, some seafarers (4.7%) indicated that increasing environmental awareness and adherence to BWM principles should result in improved protection of aquatic ecosystems. Therefore, the global problem concerning the transport of non-native organisms via ballast water has still not been solved effectively. In the near future, improved BWT systems should be introduced, which after proper training of the crew will act as a barrier to the transfer of non-native organisms in ballast water.
Źródło:
Rocznik Ochrona Środowiska; 2021, 23; 78--93
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benthic diffusive fluxes of organic and inorganic carbon, ammonium and phosphates from deep water sediments of the Baltic Sea
Autorzy:
Lengier, M.
Szymczycha, B.
Brodecka-Goluch, A.
Klostowska, Z.
Kulinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2078878.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
biogeochemistry
benthic flux
organic carbon
organic matter
remineralization
dissolved organic carbon
dissolved inorganic carbon
ammonium
phosphate
oxygen availability
deep water sediment
Baltic Sea
Opis:
In this study, Baltic Sea sediments, as a source of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), ammonium (NH4 +), and phosphates (PO4 3−), were investigated based on samples obtained in 2017 and 2018, shortly after a sequence of inflows from the North Sea that occurred between 2014 and 2017. Two different data sets (I and II) were used to assess benthic diffusive fluxes and thus elucidate both the temporal conditions at the time of sampling (data set I) and the diffusion potential of the sediments (data set II). The estimated fluxes were characterized by a high spatial variability within the whole Baltic Sea and ranged between −0.01 and 3.33 mmol m−2 d−1 for DIC, −0.02 and 0.44 mmol m−2 d−1 for DOC, −40.5 and 1370.1 μmol m−2 d−1 for NH4 +, and −5.9 and 60.9 μmol m−2 d−1 for PO4 3−. The estimated benthic diffusive fluxes indicated a high potential for DIC, DOC, NH4 +, and PO4 3− release from Baltic Sea sediments. The high O2 concentrations in the water column of the Gulf of Bothnia together with major Baltic inflows (MBIs) bringing oxygenated seawater to the Baltic Proper and to some extent the Eastern Gotland Basin regulate the amounts of chemicals released from the sediment. Our study showed that a sequence of inflows has greater impact on the diminution of diffusive fluxes than does a single MBI and that the sediments of the Baltic Proper, even under the influence of inflows, are an important source of C, N, and P (159 kt yr−1 for DIC+DOC, 6.3
Źródło:
Oceanologia; 2021, 63, 3; 370-384
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historical occurrences of marine microalgal blooms in Indian Peninsula: Probable causes and implications
Autorzy:
Oyeku, O.G.
Mandal, S.K.
Powiązania:
https://bibliotekanauki.pl/articles/2079002.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
marine environment
algal bloom
microalga
sea surface
water temperature
Indian Peninsula
Opis:
The Indian marine environment supports employment for over 200 million people, including revenue of nearly $7 billion per annum. However, ecological goods and services of the shallow coast and the marine environment of the Indian peninsula are being affected by recurrent blooms of microalgae. One hundred and six published literature, starting from the first report in 1908 to 2017, were reviewed to investigate the historical occurrences of marine microalgal blooms (MMBs) around the Indian peninsula. 154 MMBs comprising 24 genera and 7 classes were reported during the study period. Noctiluca (dinophyceae) and Trichodesmium (cyanophyceae) bloom contributed 34.4% and 31.8% of total blooms. PCA revealed that high sea surface temperature (SST) and salinity were significant driving forces for Trichodesmium blooms formation, while high nutrients (NO3-N, PO4-P, and SiO4-Si) and low salinity triggered prymnesiophyceae, raphidophyceae, bacillariophyceae and most of the dinophyceae blooms. Noctiluca blooms were linked with both eutrophication and the abundance of prey organisms. HABs were generally dinophyceae dominated and were associated with mass mortality of aquatic fauna, human intoxication, paralytic, and ciguatera shellfish poisoning and even death. Increasing SST and anthropogenic influences around the Indian peninsula could increase the occurrences of MMBs (including HABs) and the number of causative taxa. Proper safety measures such as routine monitoring of phycotoxin levels in the environment and local seafood are required to be put in place in other to protect the health of the public.
Źródło:
Oceanologia; 2021, 63, 1; 51-70
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of human-altered hydrographical setting on the copepod community structure in an extensive tropical estuary along the Southwest Coast of India
Autorzy:
Nagarathinam, A.
Retnamma, J.
Loganathan, J.
Singaram, P.
Arayillath, A.
Jose, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/2079004.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
mesozooplankton
copepod
multivariate analysis
saline water
sea water intrusion
aquatic environment
tropical estuary
India coast
Opis:
This study presents how human-altered hydrographical settings (flow restrictions) impacts the natural distribution and community structure of copepods in the Kochi Backwaters (KBW), the largest monsoonal estuary along the southwest coast of India. This study is primarily based on an extensive seasonal sampling in the KBW and their comparison with a historical data set. Thannermukkom Barrage (TB) was built in the southern section of the KBW in the 1970s to prevent saline water intrusion to the upstream during the non-monsoon periods. Thirteen locations (1—4 in the downstream, 5—9 in the midstream, and 10—13 in the upstream) were sampled in this study over the entire stretch of the KBW during the Pre-Southwest Monsoon (PRM), Southwest Monsoon (SWM), and Post-Southwest Monsoon (PSWM). The overall effect of TB in the KBW is a seaward push of mesohaline conditions during all seasons with varying intensities. In response to the seaward push of mesohaline conditions, copepods Acartiella keralensis, Acartia plumosa, Acartia sp., Pseudodiaptomus annandalei, Pseudodiaptomus serricaudatus, Euterpina acutifrons and Oithona brevicornis showed a corresponding spatial shift for their highest abundance and diversity from midstream during PRM to the downstream during the SWM/PSWM. Multivariate and IndVal analysis demarcated many indicator species of copepods of different hydrographical settings in the KBW. A comparison with the historical data set showed that there is an apparent long-term change in hydrography, copepod composition and community structure in the upstream of the KBW due to TB.
Źródło:
Oceanologia; 2021, 63, 1; 115-132
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microphytobenthic primary production on exposed coastal sandy sediments of the Southern Baltic Sea using ex situ sediment cores and oxygen optodes
Autorzy:
Kuriyama, K.
Grundling-Pfaff, S.
Diehl, N.
Woelfel, J.
Karsten, U.
Powiązania:
https://bibliotekanauki.pl/articles/2078927.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
microphytobenthos
primary production
sandy sediment
coastal water
benthic diatom
oxygen consumption
oxygen production
respiration
hydrodynamics
Baltic Sea
Opis:
The shallow coastal water zone of the tide-less southern Baltic Sea is dominated by exposed sandy sediments which are typically inhabited by microphytobenthic communities, but their primary production is poorly studied, and hence four stations between 3.0 and 6.2 m depth were investigated. Sediment cores were carefully taken to keep the natural layering and exposed in a controlled self-constructed incubator. Respiratory oxygen consumption and photosynthetic oxygen production were recorded applying planar oxygen optode sensors. We hypothesized that with increasing water depths the effects of wind- and wave-induced erosion and mixing of the upper sediment layer are dampened and expected higher microphytobenthic biomass and primary production in the incubated cores. Our data partly confirm this hypothesis, as cores sampled at the most exposed stations contained only 50% chlorophyll a m−2 compared to the deeper stations. However, primary production was highly variable, probably due to fluctuating sediment-disturbing conditions before the cores were taken. Due to these physical forces sand grains were highly mobile and rounded, and small epipsamic benthic diatoms dominated, which preferentially occurred in some cracks and crevices as visualized by scanning electron microscopy. The data fill an important gap in reliable production data for sandy sediments of the southern Baltic Sea, and point to the ecological importance and relevant contribution of microphytobenthic communities to the total primary production of this marine ecosystem. Oxygen planar optode sensor spots proved to be a reliable, sensitive and fast detection system for ex situ oxygen exchange measurements in the overlying water of intact sediment cores.
Źródło:
Oceanologia; 2021, 63, 2; 247-260
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ochrona wód morskich Morza Bałtyckiego a zrównoważony rozwój
Protection of the Marine Water of the Baltic Sea and Sustainable Development
Autorzy:
Ogonowska, Adrianna
Powiązania:
https://bibliotekanauki.pl/articles/1770811.pdf
Data publikacji:
2021-05-29
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Bałtyk
ochrona wód morskich
ekorozwój
zasada zrównoważonego rozwoju
The Baltic Sea
marine water protection
sustainable development
the sustainable
development principle
Opis:
Koncepcja zrównoważonego rozwoju opiera się na założeniu istnienia kompromisu między dalszym rozwojem ekonomicznym a zachowaniem środowiska w jak najlepszym stanie. Jest ona wdrażana poprzez różne akty prawne i dokumenty planistyczne, w tym również takie, które odnoszą się do ochrony środowiska morskiego. Cel przeprowadzenia niniejszych rozważań stanowi przedstawienie oraz ocena relacji między zrównoważonym rozwojem a ochroną środowiska morskiego Morza Bałtyckiego. Analiza dotyczy odniesień pojawiających się w prawie polskim na tle odniesień występujących w prawie międzynarodowym i unijnym.
The concept of sustainable development is based on the assumption of a compromise between economic development and maintaining the environment in the best condition. It is implemented by various legal acts and planning documents, including those that relate to the protection of the marine environment. The purpose of these considerations is to present and make an assessment of the relationship between the sustainable development and the protection of the marine environment of the Baltic Sea. The analysis concerns references appearing in Polish law in the context of references appearing in the international law and the EU law.
Źródło:
Roczniki Nauk Prawnych; 2020, 30, 2; 65-75
1507-7896
2544-5227
Pojawia się w:
Roczniki Nauk Prawnych
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 relationship between fish length and otolith size and weight of Acanthopagrus arabicus Iwatsuki, 2013 (Sparidae) collected from the Iraqi marine waters
Związek między długoscią całkowitą a wielkością i masą otolitu u Acanthopagrus arabicus, Iwatsuki 2013, (Sparidae) złowionego w irackich wodach morskich
Autorzy:
Jawad, L.
Qasim, A.
Al-Zaidy, F.M.
Waryani, B.
Rutkayová, J.
Powiązania:
https://bibliotekanauki.pl/articles/3131491.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fish size
fish length
otolith
yellowfin seabream
Acanthopagrus arabicus
Sparidae
sea water
Iraq
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2021, 20, 1; 27-33
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Quality and Radionuclides Content Assessment of the Al-Najaf Sea: Case Study
Autorzy:
Zwain, Haider M.
Almurshedi, Kareem Radhi
Vakili, Mohammadtaghi
Dahlan, Irvan
Naje, Ahmed Samir
Powiązania:
https://bibliotekanauki.pl/articles/1839100.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
irrigation water
water quality assessment
salinity
sodicity
radionuclide
Al-Najaf Sea
Opis:
The Al-Najaf state is witnessing an increased economic development and attracting more investments that require the development of new areas and exploring new water resources. This study evaluates the quality of 12 surface water samples and groundwater from 12 wells for irrigation according to the salinity and sodicity hazards based on electrical conductivity (EC) and sodium adsorption ratio (SAR). In addition, the concentrations of radionuclides, which include Thorium (232Th), Uranium (238U), Potassium (40K) and Cesium (137Cs) were tested in four soil samples in the study area. It was found that the average values of pH, total hardness, Na, Ca, Mg, K, Cl, SO4, NO3 for groundwater and surface water were 8 and 6, 2287 and 4006 mg/L, 1140 and 1232 mg/L, 378 and 637 mg/L, 327 and 587 mg/L, 2 and 2 mg/L, 989 and 2007 mg/L, 1149 and 1325 mg/L, as well as 2 and 2 mg/L, respectively. From salinity and sodicity hazards analysis, the groundwater had EC of 5242 µS/cm and SAR of 61, whereas surface water had EC of 6253 µS/cm and SAR of 50. Furthermore, the concentrations of radionuclides, i.e. 232Th, 238U, 40K and 137Cs in the soil samples were found to be 11.02, 34.12, 544.45, and 1.6 Bq/kg, respectively. The concentrations of radionuclides were within the worldwide baseline, expect for 40K. The study concluded that both water sources are classified as very high salinity and sodium water (class C4-S4), and it cannot be used for irrigation, only suitable for the salt tolerant crops.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 262-271
2299-8993
Pojawia się w:
Journal of Ecological Engineering
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:
Combined impact of summer heat waves and coastal upwelling in the Baltic Sea
Autorzy:
Suursaar, U.
Powiązania:
https://bibliotekanauki.pl/articles/2079092.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
global warming
heat wave
coastal upwelling
water temperature
salinity
satellite image
Finland Gulf
Baltic Sea
Opis:
Under warming climates, heat waves (HWs) have occurred in increasing intensity in Europe. Also, public interest towards HWs has considerably increased over the last decades. The paper discusses the manifestations of the summer 2014 HW and simultaneously occurring coastal upwelling (CU) events in the Gulf of Finland. Caused by an anticyclonic weather pattern and persisting easterly winds, CUs evolved along the southern coast of the Gulf in four episodes from June to August. Based on data from coastal weather stations, 115 days-long measurements with a Recording Doppler Current Profiler (RDCP) oceanographic complex and sea surface temperature (SST) satellite images, the partly opposing impacts of these events are analysed. Occurring on the background of a marine HW (up to 26°C), the CU-forced SST variations reached about 20 degrees. At the 10 m deep RDCP mooring location, a drop from 21.5 to 2.9°C occurred within 60 hours. Salinity varied between 3.6 and 6.2 and an alongshore coastal jet was observed; the statistically preferred westerly current frequently flowed against the wind. Locally, the cooling effect of the CUs occasionally mitigated the overheating effects by the HWs both in the sea and on the marine-land boundary. However, in the elongated channel-like Gulf of Finland, upwelling at one coast is usually paired with downwelling at the opposite coast, and simultaneously or subsequently occurring HWs and CUs effectively contribute to heat transfer from the atmosphere to the water mass. Rising extremes of HWs and rapid variations by CUs may put the ecosystems under increasing stress.
Źródło:
Oceanologia; 2020, 62, 4PA; 511-524
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 324

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