13 results on '"Andrija Vinković"'
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2. Influence of the Processing Parameters on the Aroma Profile and Chemical Composition of Conventional and Ecological Cabernet Sauvignon Red Wines during Concentration by Reverse Osmosis
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Ivana Ivić, Mirela Kopjar, Jasmina Obhođaš, Andrija Vinković, Jurislav Babić, Josip Mesić, and Anita Pichler
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conventional and ecological Cabernet Sauvignon ,reverse osmosis ,aroma profile ,chemical composition ,processing parameters ,retention ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
Wine aroma represents one of the most important quality parameters and it is influenced by various factors, such as climate conditions, viticulture and vinification techniques, storage conditions, etc. Wines produced from conventionally and ecologically grown grapes of the same variety have different chemical compositions and aroma profiles. The composition of wine can also be influenced by the additional treatment of wine, such as the concentration of wine by reverse osmosis (RO). The aim of this study was to investigate the influence of four different pressures (2.5, 3.5, 4.5 and 5.5 MPa) and two temperature regimes (with and without cooling) on the aroma profile and chemical composition of conventional and ecological Cabernet Sauvignon red wine during concentration by reverse osmosis. The results showed that different processing parameters influenced the permeate flux, the retentate temperature and the compounds retention. Higher working pressures (4.5 and 5.5 MPa) and the regime, with cooling, resulted in a higher retention of the total aroma compounds than the opposite processing parameters. The retention of individual compounds depended also on their chemical properties and their interactions with the membrane surface. The reverse osmosis membranes proved to be permeable for ethanol, acetic acid or undesirable 4-ethylphenol and 4-ethylguaiacol that made them applicable for their correction or removal. more...
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- 2022
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3. Concentration with Nanofiltration of Red Wine Cabernet Sauvignon Produced from Conventionally and Ecologically Grown Grapes: Effect on Volatile Compounds and Chemical Composition
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Ivana Ivić, Mirela Kopjar, Jasmina Obhođaš, Andrija Vinković, Dubravko Pichler, Josip Mesić, and Anita Pichler
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Cabernet Sauvignon red wine ,ecological wine ,conventional wine ,nanofiltration ,volatile compounds ,chemical composition ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
Ecological viticulture represent an upward trend in many countries. Unlike conventional viticulture, it avoids the use of chemical fertilizers and other additives, minimizing the impact of chemicals on the environment and human health. The aim of this study was to investigate the influence of nanofiltration (NF) process on volatiles and chemical composition of conventional and ecological Cabernet Sauvignon red wine. The NF process was conducted on laboratory Alfa Laval LabUnit M20 (De Danske Sukkerfabrikker, Nakskov, Denmark) equipped with six NF M20 membranes in a plate module, at two temperature regimes, with and without cooling and four pressures (2.5, 3.5, 4.5 and 5.5 MPa). Different processing parameters significantly influenced the permeate flux which increased when higher pressure was applied. In initial wines and obtained retentates, volatile compounds, chemical composition and elements concentration were determined. The results showed that the higher pressure and retentate cooling was more favourable for total volatiles retention than lower pressure and higher temperature. Individual compound retention depended on its chemical properties, applied processing parameters and wine composition. Nanofiltration process resulted in lower concentrations of ethanol, acetic acid (>50%), 4-ethylphenol and 4-ethylguaiacol (>90%). Different composition of initial feed (conventional and ecological wine) had an important impact on retention of elements. more...
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- 2021
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4. Efficient removal of U(VI) from aqueous solution using the biocomposite based on sugar beet pulp and pomelo peel
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Mirza Nuhanović, Nerma Curić, Narcisa Smječanin, and Andrija Vinković
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Langmuir ,Aqueous solution ,Sorbent ,Chemistry ,Health, Toxicology and Mutagenesis ,Pulp (paper) ,Public Health, Environmental and Occupational Health ,Biosorption ,engineering.material ,Uranium (VI) ,Biocomposite ,Equilibrium ,Thermodynamics ,Desorption ,010403 inorganic & nuclear chemistry ,01 natural sciences ,Pollution ,0104 chemical sciences ,Analytical Chemistry ,Adsorption ,Nuclear Energy and Engineering ,engineering ,Radiology, Nuclear Medicine and imaging ,Spectroscopy ,Nuclear chemistry - Abstract
A biocomposite sorbent composed of sugar beet pulp and pomelo peel was utilized for the biosorption of uranium (VI) from the aqueous solution. Parameters such as solution pH, biocomposite amount, contact time, temperature and initial concentration of U(VI) ions on the adsorption performance of biocomposite sorbent was studied. The equilibrium data fitted best to the Langmuir’s isotherm model (qe, max = 79.36 mg g–1). Obtained thermodynamic and kinetic parameters demonstrated that the biosorption process is spontaneous, exothermic, and fitted best to the pseudo-second order. The desorption study revealed that uranium recovery by 0.1 M NaHCO3 was 99.24% in the first cycle for used biocomposite. more...
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- 2021
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5. The Growth and Sporulation of Bacillus subtilis in Nanotesla Magnetic Fields
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Jasmina Obhođaš, Karlo Nađ, Andrija Vinković, Robert Kollar, Jasna Hrenović, Željko Orlić, and Vladivoj Valkovic
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Physics ,biology ,Multiplication rate ,Bacillus subtilis ,equipment and supplies ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Geomagnetic reversal ,Spore ,Magnetic field ,Space and Planetary Science ,Biophysics ,Nanotesla magnetic fields ,Geomagnetic reversals ,Human voyages into deep space ,human activities ,Order of magnitude - Abstract
The order of magnitude of increased growth, multiplication rate, and decreased sporulation of Bacillus subtilis after exposure to nanotesla magnetic fields (MFs) relative to control samples were observed experimentally. Earth’s total magnetic field intensity was reduced from 47.9 +– 0.4 mT to cover the range from 97.5 +– 1.7 nT to 1115 +– 158 nT in eight subsequent experiments by using three pairs of Helmholtz coils combined with Mu-metal shielding. The growth, multiplication rate, sporulation, and potassium content were measured in the probe and control containing B. subtilis cultures after 24 h of exposure to nanotesla and Earth’s magnetic fields, respectively. The observed effect is discussed with regard to its possible repercussions on Earth’s living species during geomagnetic reversals that occurred when the magnetic field was much weaker than the field that exists today. In addition, effects on future manned voyages into deep space, an environment with reduced magnetic field intensity, are considered. more...
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- 2021
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6. Could atmospheric carbon be driving sedimentation?
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Andrija Vinković, Gennadiy Laptyev, Günseli Yaprak, Krasimira Slavova, Danijela Joksimović, Tamara Troskot-Čorbić, Marina Frontasyeva, Octavian G. Duliu, Elida Bylyku, Manjola Shyti, Famil Humbatov, Mirza Nuhanović, Narcisa Smječanin, Tzvetana Nonova, Lyuben Dobrev, Ioannis Pashalidis, George Melikadze, Alexandra Ioannidou, Christos Tsabaris, Almira Aidarkhanova, Daniela David, Inga Zinicovscaia, Alexander Kamnev, Milena Horvat, Marijan Nečemer, Radojko Jaćimović, Haluk Yucel, Yakup Kalayci, Abdullah Dirican, Ilker Sert, Marina Plotsen, Kyrylo Korychenskyi, Sam Matar Adam Khatir, Sylvia G. Sander, Katherina Deufrains, Hana Fajković, Tin Klanjšček, Neda Vdović, Tarzan Legović, and Jasmina Obhođaš more...
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Ocean ,Climate change ,Pb-210 and Cs-137 dating ,Carbon ,Particle size distribution ,X-ray powder diffraction ,The Adriatic Sea ,The Black Sea ,Sediment ,Sedimentation rate ,Black-Sea ,Stratigraphy ,Water ,Pb-210 ,Acidification ,Aegean Sea ,Dioxide Uptake ,Trends ,Photosynthesis ,Earth-Surface Processes ,Nutrient - Abstract
Purpose The objective of this study was to provide insights into the most recent responses of sediments to climate change and their capability to sequester atmospheric carbon (C). Methods Three sediment cores were collected, one from the western Black Sea, and two from the southern Adriatic Sea. Cores were extruded and sectioned into 1 cm or 0.5 cm intervals. Sections were frozen, weighed, freeze-dried, and then weighed again to obtain dry weights. Freeze-dried samples were dated by using lead 210 (Pb-210) and cesium 137/ americium 241 (Cs-137/Am-241). Organic and inorganic C were determined by combustion. Particle size distribution was determined using a Beckman Coulter particle size analyzer (LS 13,320; Beckman Coulter Inc.). Mineralogical analyses were carried out by a Philips X'Pert powder diffractometer. Results Sedimentation and organic and inorganic C accumulation rates increased with time in both the Black Sea and the Adriatic Sea. The increase in accumulation rates continued after the global introduction in the early 1970s of controls on the release of phosphorus (P) into the environment and despite the reduced sediment yield of major rivers (Po and Danube). Therefore, the increased accumulation of organic and inorganic C in the sediments cannot be assigned only to nutrient availability. Instead, we suggest that the increase in organic C is the consequence of the increase in atmospheric C, which has made more carbon dioxide (CO2) available to phytoplankton, thus enabling more efficient photosynthesis. This process known as CO2 fertilization may increase the organic C accumulation in sediments. Simultaneously, the increase of sea temperatures decreases the calcite solubility resulting in increases of the inorganic C accumulation. Conclusion Our results suggest that long-term, general increases in accumulation rates of organic and inorganic C in sediments are the consequence of increases in atmospheric C. This shows that coastal sediments play an important role in C uptake and thus in regulating the Earth's climate., Croatian Science Foundation-Youth Careers Development Project [ESF-DOK-1-2018]; Croatian Science Foundation [IP-01-2018], AV acknowledges the support of the Croatian Science Foundation-Youth Careers Development Project (ESF-DOK-1-2018). JO and TK acknowledge the support of the Croatian Science Foundation project IP-01-2018. more...
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- 2022
7. Analysis of carbon in sediments using fast neutron activation analysis (FNAA)
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Vladivoj Valkovic, Jasmina Obhođaš, Karlo Nađ, Andrija Vinković, and Davorin Sudac
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FNAA, Loss-on-Ignition, Sediment, The Black Sea ,chemistry ,Stratigraphy ,Radiochemistry ,Environmental science ,chemistry.chemical_element ,Neutron activation analysis ,Carbon ,Earth-Surface Processes - Abstract
Purpose: Measurement of carbon in cores of undisturbed sediments may provide valuable information on historical trends in sea primary production and carbonate precipitation which can be related to climate changes. Since core sediments are usually subjected to a different analysis, it is important to preserve the sample. Anon-destructive technique for carbon measurement in sedimentsbased on Fast Neutron Activation Analysis (FNAA) has been developed, which might replace the Loss-on-Ignition (LOI) as a conventional method for carbon analysis. Materials and methods: Method was tested on sediment samples collected from the Western Black Sea at depths up to 22 m. A surface sample and a corecut in centimeter intervals were freeze-dried. Samples weighing between 60 and 300 g were irradiated with the portable neutron generator. Gamma rays from 12C(n, n'γ)12C nuclear reaction were collected between 2000 and 4000 s by LaBr3:Ce detector. Standards for direct comparison and construction of the calibration line were prepared as mixtures of different amounts of quartz sand and graphite powder. FNAA results for total carbon (TC) were verified by LOIat 1000°C.LOIat 450°C and treatment with 1 M HCl were used to separate inorganic carbon (IC) and organic carbon(OC), respectively, followed by the FNAA measurements. Results and discussion: Climate effects on physical and biological marine processes are evident as historical changes in carbon flux to sediments. Carbon in sediments is found in the form of the OC produced byphotosynthetic organisms and as IC produced by calcifying organismsand precipitated as calcite. The FNAA is usually applied to samples weighing more than 1 kg. The method was optimized to reduce the minimum weight of the sample to 60 g, after subsequent adaptation of the set-up geometry.Carbon content measured in cores and surface sediment was between 2.8 and 6.1 wt%. OC constituted up to 84% of TC measured in the core.FNAA measurements were in good agreement with LOI analysis. Conclusions: The results have shown that FNAA can be used for the non-destructive determination of carbon in sediments in samples weighing ≥ 60g.FNAA is non-destructive, robust and fast in comparison to conventional methods for carbon determination such as LOI.The disadvantage is a relatively high MDL of 1%. more...
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- 2019
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8. Effects of microscale particles in red mud amended artificial soils on bioaccumulation of elements in E. fetida
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Marijan Marciuš, Neda Vdović, Andrija Vinković, Davorin Sudac, Tea Mišić Radić, Viktória Feigl, Vladivoj Valkovic, and Jasmina Obhođaš
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Eisenia fetida ,Environmental Engineering ,Health, Toxicology and Mutagenesis ,Potassium ,0211 other engineering and technologies ,chemistry.chemical_element ,02 engineering and technology ,Absorption (skin) ,010501 environmental sciences ,Calcium ,01 natural sciences ,Soil ,NATURAL SCIENCES ,Environmental Chemistry ,Animals ,Soil Pollutants ,Oligochaeta ,Waste Management and Disposal ,Biology ,0105 earth and related environmental sciences ,021110 strategic, defence & security studies ,biology ,Ecology ,Physics ,Earthworm ,biology.organism_classification ,Pollution ,Bioaccumulation ,Red mud ,chemistry ,Environmental chemistry ,Soil water ,Microscale particles ,Dorsal pores ,Dermal pores ,Elements uptake ,Potential deficiency of K Ca and Fe ,Artificial soil test ,Biophysics and Medical Physics - Abstract
Red mud (RM) contains large quantities of microscale particles < 1 micrometer and high concentrations of potentially toxic elements. In this research, we have used two types of RM of similar chemical properties but containing different quantities of micro-particles, to test whether their size plays a role in the uptake of chemical elements by earthworm Eisenia fetida. Earthworms were exposed for seven days to artificial soils (prepared in the laboratory following a protocol) amended with increasing quantities of RM. Mortality of 86% occurred when earthworms were exposed to amended soil containing 46% of particles below 1 µm. Surprisingly, tissue analyses have shown decreased concentrations of metals instead of the expected toxic effect. SEM analysis revealed that micro-particles strongly adhere to the earthworm epidermis putting them under the large stress. Micro-particles in RM clog their minute dermal pores of 90 nm to 735 nm in diameter, which size depends on whether the earthworm’s body is contracted or stretched. Strong adhesion of micro-particles to earthworms’ epidermis and blockage of their microsize pores prevented normal dermal respiration and absorption of chemical elements through their epithelium resulting in a decrease of most measured metals, especially essential elements potassium, calcium and iron, followed by the lethal outcomes. more...
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- 2021
9. Concentration with nanofiltration of red wine Cabernet Sauvignon produced from conventionally and ecologically grown grapes: effect on volatile compounds and chemical composition
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Dubravko Pichler, Josip Mesić, Jasmina Obhođaš, Andrija Vinković, Anita Pichler, Mirela Kopjar, and Ivana Ivić
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Filtration and Separation ,TP1-1185 ,02 engineering and technology ,Cabernet Sauvignon red wine ,ecological wine ,conventional wine ,nanofiltration ,volatile compounds ,chemical composition ,elements concentration ,Article ,chemistry.chemical_compound ,Acetic acid ,Chemical engineering ,0404 agricultural biotechnology ,Chemical Engineering (miscellaneous) ,Chemical composition ,Wine ,Ethanol ,Chemical technology ,Process Chemistry and Technology ,04 agricultural and veterinary sciences ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,040401 food science ,Membrane ,chemistry ,Food Technology ,TP155-156 ,Composition (visual arts) ,Nanofiltration ,Viticulture ,0210 nano-technology - Abstract
Ecological viticulture represent an upward trend in many countries. Unlike conventional viticulture, it avoids the use of chemical fertilizers and other additives, minimizing the impact of chemicals on the environment and human health. The aim of this study was to investigate the influence of nanofiltration (NF) process on volatiles and chemical composition of conventional and ecological Cabernet Sauvignon red wine. The NF process was conducted on laboratory Alfa Laval LabUnit M20 (De Danske Sukkerfabrikker, Nakskov, Denmark) equipped with six NF M20 membranes in a plate module, at two temperature regimes, with and without cooling and four pressures (2.5, 3.5, 4.5 and 5.5 MPa). Different processing parameters significantly influenced the permeate flux which increased when higher pressure was applied. In initial wines and obtained retentates, volatile compounds, chemical composition and elements concentration were determined. The results showed that the higher pressure and retentate cooling was more favourable for total volatiles retention than lower pressure and higher temperature. Individual compound retention depended on its chemical properties, applied processing parameters and wine composition. Nanofiltration process resulted in lower concentrations of ethanol, acetic acid (>, 50%), 4-ethylphenol and 4-ethylguaiacol (>, 90%). Different composition of initial feed (conventional and ecological wine) had an important impact on retention of elements. more...
- Published
- 2021
10. Changes in Trends of the Seawater Column Parameters and Sediment Elements’ Concentrations from 2009 to 2018 in the Marina Located in the Northern Adriatic Sea
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Pal Barši, Marinka Kutle, Tarzan Legović, Tomislava Bužan, Andrija Vinković, Ante Kutle, Jasmina Obhođaš, and Vladivoj Valković
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Fecal coliform ,Environmental chemistry ,Environmental monitoring ,Environmental science ,Sediment ,Seawater ,Sewage treatment ,Leaching (agriculture) ,Column (botany) ,Environmental quality - Abstract
Assessment of environmental quality within marinas is essential to validate implemented environmental protection measures and to adopt appropriate action plans. Here we present temporal trends over the period from 2009 to 2018 using seasonal analysis of physico-chemical and microbiological parameters in seawater column and measurements of elements’ concentrations in surface sediments of the Marina Punat, located in the northern Adriatic Sea, in order to evaluate improvements and deteriorations in marine environmental quality. Environmental monitoring in Marina Punat is carried out four times per year (in May, July, August, and October) at four sampling points (three are within the marina and one is an outside control point). The parameters analysed in situ in a bottom and surface seawater layer are conductivity, dissolved oxygen (DO), pH, mineral oil, total coliform bacteria, faecal coliforms, and intestinal enterococci. The concentrations of elements K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, As, Br, Rb, Sr, Y, Zr, Sn, Hg, and Pb in surface sediments collected twice per year (in May and August) were analysed in the laboratory by the EDXRF technique. The concentrations of elements in sediments are compared to results from 2005, i.e. prior to full operation of wastewater treatment plants deployed in service areas where boats are repaired and antifouling paints (AFPs) are removed from boats’ hulls. There has been a significant improvement in sediment quality in Marina Punat after deployment of the wastewater treatment plants, especially with respect to Cu concentrations close to service areas. An increase in concentrations of V, Fe, Cu, Zn, As, and Pb in surface sediments within the marina due to passive leaching from AFPs is still present. On the whole data set, there were no trends in pH and DO values, however, strongly correlated seasonal trends were observed. The seasonal increase and decrease of DO and pH values in the seawater column are unlikely to be related to the marina’s activities. A quick overview of the status of the environmental monitoring in the marinas in Montenegro has been given. This study provides support data for further improvement of management practices in marinas, both in Croatia and Montenegro. more...
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- 2021
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11. The Growth and Sporulation of
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Jasmina, Obhođaš, Vladivoj, Valković, Robert, Kollar, Jasna, Hrenović, Karlo, Nađ, Andrija, Vinković, and Željko, Orlić
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Magnetic Fields ,Bacillus subtilis - Abstract
The order of magnitude of increased growth, multiplication rate, and decreased sporulation of
- Published
- 2020
12. Correction to: Past and present potential of the Adriatic deep sea sediments to produce methane hydrates
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Jasmina Obhodas, Umberta Tinivella, Filip Soprun, Tatjana Durn, Michela Giustiniani, Andrija Vinković, Sara Radic, and Davorin Sudac
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chemistry.chemical_compound ,chemistry ,Stratigraphy ,Geochemistry ,Deep sea ,Geology ,Methane ,Earth-Surface Processes - Published
- 2020
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13. Past and present potential of the Adriatic deep sea sediments to produce methane hydrates
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Michela Giustiniani, Sara Radic, Jasmina Obhodas, Andrija Vinković, Davorin Sudac, Tatjana Durn, Filip Soprun, and Umberta Tinivella
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Stratigraphy ,Global warming ,Climate change ,Last Glacial Maximum ,04 agricultural and veterinary sciences ,010501 environmental sciences ,Permafrost ,01 natural sciences ,Deep sea ,Methane ,chemistry.chemical_compound ,Oceanography ,chemistry ,13. Climate action ,Adriatic Sea, Deep sea sediments, Global climate change, Methane hydrates ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Seawater ,14. Life underwater ,Geothermal gradient ,Geology ,0105 earth and related environmental sciences ,Earth-Surface Processes - Abstract
Purpose: There is a growing understanding that methane hydrates (MHs) distributed globally in permafrost and deep sea sediments present an enormous unconventional reservoir of methane (CH4) ; however, there is also increasing concern about their role in the global climate change. The study focuses on the evaluation of the environmental conditions in the deep Adriatic Sea during the Last Glacial Maximum (LGM, 21.5–18.3 ka BP) and presently with respect to MHs potential occurrence. Materials and methods: The MHs phase stability diagram was calculated in order to evaluate the methane hydrate stability zone (MHSZ) by using the Croatian Legacy Data and the digital bathymetry map of the Adriatic Sea obtained from the Croatian Hydrocarbon Agency (CHA). Environmental data from different surveys published in the scientific literature were used to assess the environmental conditions in the deep Adriatic Sea during the LGM and present. The sea level rise of 100 m since the end of the LGM was taken into consideration. The volume of methane in place (MIP) as an estimation of the amount of CH4 stored in MHs deposits at standard conditions of pressure and temperature (SPT, T0 = 273.15 K, P0 = 0.101325 MPa) was calculated by using combined gas law VSPT = (P×V/T) × (TSPT/PSPT). Results and discussion: Evaluation of the MHs phase stability diagram for the Adriatic Sea in present environmental conditions has revealed that MHs are exactly at the boundary of stability. This has been calculated for the potential temperature of 13 °C, the salinity of 3.87% (data measured at the E2-M3A deep ocean observatory of the Southern Adriatic), and the average geothermal gradient of 17 °C km−1 reported in the literature and verified by the Croatian Legacy Data of CHA. According to the published literature, LGM deep sea temperature was 2–4 ° C lower and seawater was saltier. Consequently, the estimation of MHSZ during the LGM taking into consideration the temperature of 10 °C and salinity of 3.98% revealed a potential deposit of methane in place (MIP) of more than 415 × 109 m3, the majority of which probably dissociated in the sea/atmosphere system in the last 18 ka. Conclusions: The results have shown that MHs reservoir in the deep sea Adriatic basin shows boundary instability for MHs occurrence which might be of importance for studying the role of MHs in climate change. Further research is needed as follows: (1) thermodynamic modeling in order to understand if the MHs dissociation is concluded ; and (2) in the case of the transient condition, seismic data analysis in order to reveal the presence of a relic bottom simulating reflection. more...
- Published
- 2019
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