991 resultados para Red Sea Region--Maps--Early works to 1800
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Norway is currently the only Western European state and ‘old’ NATO member that strongly relies on the traditional dimension of NATO's collective defence. It is also the only ally in Western Europe which perceives Russia as a threat to its military security, in the so-called High North. In order to successfully deal with the potential challenges and threats in the region, Norway has been pursuing a defence policy based on cooperation and deterrence. Cooperation means improving collaboration with Russia in cross-border relations, in the petroleum sector and in the military sphere. The deterrent measures include maintaining NATO’s credibility as a collective defence alliance; increasing military cooperation with the United States; building up Norway’s own military capabilities; and developing military cooperation across Northern Europe. The primary objective of Oslo’s defence policy is to minimise the likelihood of crises and conflicts emerging in the High North which could prove too ‘big’ for Norway but too ‘small’ for NATO.
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Germany is one of the eight EU member states which participate in the EU Strategy for the Baltic Sea Region along with Denmark, Estonia, Finland, Latvia, Lithuania, Poland and Sweden. Germany had a positive approach to the EUSBSR strategy (see Appendix 1) right from planning stage. This project contributed to the continuation of Germany’s co-operation with the countries in this region, which has been conducted since the mid 1980s mainly by German federal states. Germany is playing a major role as part of this strategy because it is the coordinator of its three priority areas.However, the German federal government sees the EUSBSR as a project to be implemented at the level of federal states. This has been proven by the great activity of three German federal states participating in the strategy (Hamburg, Mecklenburg-Vorpommern and Schleswig-Holstein) and at the same time the low level of engagement from the Bundestag, the federal government and expert circles. Furthermore, federal states more often formulate evaluations of the effects of co-operation achieved so far as part of the EUSBSR. Still, the relatively low level of Berlin’s engagement does not mean that it is not interested in co-operation in the Baltic region as such. Germany actively participates in the work of such bodies as the Council of the Baltic Sea States or the Baltic Marine Environment Protection Commission (HELCOM). All German entities engaged in the strategy make its future attractiveness and the success of individual projects as part of it dependent on including Russia in the EUSBSR. As long as Germany has the opportunity of regional co-operation with Russia at other forums (for example, the Council of the Baltic Sea States), it is unlikely to become more engaged in developing the strategy and enhancing co-operation as part of this project.
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Here, we present bulk organic geochemical data from a spatial grid of surface samples from the western Barents Sea region. The results show that the distribution of organic carbon in surface sediments is predominantly controlled by input from land-derived terrigenous and in-situ produced marine organic matter. Inferred from various nitrogenous fractions and stable isotopes of bulk organic carbon we show that the spatial distribution of terrigenous organic carbon is independent of water depth, organic carbon mineralization and variable sedimentation rates. Instead, the pattern is predominantly controlled by sea ice-induced lateral transport and subsequent release in the Marginal Ice Zone (MIZ) as well as the distance to shore. Consistent with the observation of high vertical flux of particulate organic material in the MIZ, are amounts of marine organic carbon significantly enhanced in sediments below the winter ice margin. This is in accordance with modern observations suggesting that Arctic shelves with seasonal ice zones can be hot spots of vertical carbon export and thus a potential CO2 sink.
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Chloroform extracts of water-soluble organic matter collected in the water column from the surface to the bottom were studied by C-13 and H-1 NMR chromatographic mass spectrometry, and phthalate concentrations were determined by capillary gas-liquid chromatography. More than 14 compounds were found including diethyl phthalate, ethyl butyl phthalate, dibutyl phthalate, and di-2-ethylhexyl phthalate, phthalates with normal C4-C12 chains, phthalates partially esterified with methanol, and others, at total concentrations up to 0.4 mg/l. Possible reasons for presence of phthalates in oceans, sometimes in high concentrations, are discussed.
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The study of textural, structural, chemical, and physical properties of fine-grained recent marine sediments leads to the conclusion that only a few compositional factors are responsible for significant changes in mass physical characteristics in the upper meters below sea bottom. Fossil-induced porosity increases water content and liquid limit. It also seems to have partially influenced the plastic limit and plasticity index of calcareous sandy silts from the Red Sea and the western Gulf of Aden so that they become similar to the montmorillonite rich prodelta clays from the Nile Delta. Diagrams based on liquid limit and plasticity loose their original meaning in these cases. Activity of sediments rich in microorganisms can be higher than that of montmorillonitic clay. The shear strength-depth relationship of normally consolidated sediments is surprisingly little influenced by changes in sand or clay content and clay mineralogy. Only high lime content, submarine erosion and beginning cementation increase the strength considerably. Erosional disconformities near the present surface can be deduced from the strength-depth curve when as little as 1 or 2 m sediment have been removed. Flat or irregular strength-depth curves indicate beginning cementation and probably discontinuous sedimentation, provided the composition of the material remains in some degree constant. In our samples diagenetic pyrite, but no recristallisation of carbonates could be detected under the microscope. Underconsolidation and excess pore-water pressure, factors which tend to foster submarine slides, mud lumps, and diapiric folding, seem to be restricted Varito areas with mainly rapidly deposited, homogeneous or layered sediments. But where an abundance of burrowing organisms increases the vertical permeability of the sediment, normal consolidation and stable deposits are to be expected, at least in the upper meters below the present surface. According to 14C-determinations on calcareous microorganisms the rate of deposition of the investigated sediments seems to range from 26 to 167 cm per 1000 years.
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New results of geothermal studies at 18°N in the Red Sea rift zone are discussed. It was established that the thermal field of the African plate in this area has a higher than ordinary level, and averages 3.0-3.5 UTF. Heat flow of the Arabian plate is characterized by negative anomalies and is local in character in comparison to adjoining areas of the rift.
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Includes reprints of original title-pages.
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Signatures : B-Y⁸, Z⁴
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Thesis (Master's)--University of Washington, 2016-06
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DUE TO COPYRIGHT RESTRICTIONS ONLY AVAILABLE FOR CONSULTATION AT ASTON UNIVERSITY LIBRARY AND INFORMATION SERVICES WITH PRIOR ARRANGEMENT
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Egypt has always been a world-renowned tourism destination of antiquity. A government policy of product diversification attempts to disperse tourists more evenly in the country. The Egyptian Red Sea coast is therefore targeted as a new tourism development zone. The author identifies the new development patterns in the Egyptian Red Sea area and discusses the potential tourism impact on the coastal environment. It is recommended that a responsible development approach be adopted for coastal and marine tourism in the Egyptian Red Sea area
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Two water samples and two sediment samples taken in 1965 by the R. V. "Meteor" in the area of the hot salt brine of the Atlantis II-Deep were chemically investigated, and in addition the sediment samples were subjected to X-ray and optical analysis. The investigation of the sulfur-isotope-ratios showed the same values for all water samples. This information combined with the Ca-sulfate solubility data leads us to conclude that, for the most part, the sulfate content of the salt brine resulted from mixing along the boundary with the normal seawater. In this boundary area gypsum or anhydrite is formed which sinks down to the deeper layers of the salt brine where it is redisolved when the water becomes undersaturated. In the laboratory, formation of CaS04 precipitate resulted from both the reheating of the water sample from the uppermost zone of the salt brine to the in-situ-temperature as well as by the mixing of the water sample with normal Red Sea water. The iron and manganese delivered by the hot spring is separated within the area of the salt brine by their different redox-potentials. Iron is sedimented to a high amount within the salt brine, while, as evidenced by its small amounts in all sediment samples, the more easily reducible manganese is apparently carried out of the area before sedimentation can take place. The very good layering of the salt brine may be the result of the rough bottom topography with its several progressively higher levels allowing step-like enlargements of the surface areas of each successive layer. Each enlargement results in larger boundary areas along which more effective heat transfer and mixing with the next layer is possible. In the sediment samples up to 37.18% Fe is found, mostly bound as very poorly crystallized iron hydroxide. Pyrite is present in only very small amounts. We assume that the copper is bound mostly as sulfide, while the zinc is most likely present in an other form. The sulfur-isotope-investigations indicate that the sulfur in the sediment, bound as pyrite and sulfides, is not a result of bacterical sulfate-reduction in the iron-rich mud of the Atlantis II-Deep, but must have been brought up with the hot brine.
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Coral palaeoclimatic studies are under way at many sites throughout the wet tropics. However, arid environments have received less attention. Here we report a high-resolution, 63 yr record of coral d18O and d13C extracted from a Porites colony from the Dahlak Archipelago, off the Eritrean coast, in the southern Red Sea. The annual cycles of the coral d18O and d13C are inversely related while their inter-annual variations show a strong positive correlation, with similar inter-decadal trends. Inter-annual variations in coral d18O show a relatively weak correlation with the southern Red Sea SST, but are strongly correlated with the Indian Ocean SST, especially on the decadal time-scale. The range of the inter-annual variations in the coral d18O is high compared to changes in local SST, due to the amplifying effect of simultaneous changes in water isotopic composition. Due to this amplification of the climate signal the coral provides a better indication of regional oceangraphic behaviour than the local SST record. The norrtheast monsoon signal in the coral d18O dominates the mean annual signal and shows the best correlation with the instrumental data sets. It appears that variations in the coral d18O are controlled mainly by variations in the intensity of surface water influx from the Indian Ocean to the Red Sea during the winter northeast monsoon. Of particular significance is that the decadal time-scale variations in the coral skeletal d18O are closely correlated with both the Indian Ocean SST and with variations in the Pacific-based Southern Oscillation index. That is, isotopically light coral skeleton, indicating strong NE monsoon Red Sea inflow, correlates with periods of high Indian Ocean SST and with predominantly negative (El Nino) phases of the Southern Oscillation. The simultaneous nature of inter-decadal changes in Asian monsoon and ENSO behaviour suggest pan-Indo-Pacific tropical climate reorganisation and evolution.
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The distribution of living (Rose Bengal-stained), dead and fossil benthic foraminifera was investigated in six short cores (multicores, 30-32 cm total length) recovered from the central Red Sea. The ecological preferences as well as the relationship between the live and dead/fossil assemblages (preserved down-core) were examined. The sites, located along a W-E profile and between the depth of 366 and 1782 m, extend from the center of the oxygen minimum zone (OMZ, ~200-650 m), through its margin at ~600 m, and down to the well-aerated deep-water environment. Live (Rose-Bengal stained) and coexisting dead foraminifera were studied in the upper 5 cm of each of the sites, and the fossil record was studied down to ~32 cm. Q-mode Principal Component Analysis was used and four distinct foraminiferal fossil assemblages were determined. These assemblages follow different water mass properties. In the center of the OMZ, where the organic carbon content is highest and the oxygen concentration is lowest (<=0.5 ml O2/l), the Bolivina persiensis-Bulimina marginata-Discorbinella rhodiensis assemblage dominates. The slightly more aerated and lower organic-carbon-content seafloor, at the margin of the OMZ, is characterized by the Neouvigerina porrecta-Gyroidinoides cf. G. soldanii assemblage. The transitional environment, between 900-1200 m, with its well-aerated and oligotrophic seafloor, is dominated by the Neouvigerina ampullacea-Cibicides mabahethi assemblage. The deeper water (>1500 m), characterized by the most oxygenated and oligotrophic seafloor conditions, is associated with the Astrononion sp. A-Hanzawaia sp. A assemblage. Throughout the Red Sea extremely high values of temperature and salinity are constant below ~200 m depth, but the flux of organic matter to the sea floor varies considerably with bathymetry and appears to be the main controlling factor governing the distribution pattern of the benthic foraminifera. Comparison between live and the dead/fossil assemblages reveals a large difference between the two. Processes that may control this difference include species-specific high turnover rates, and preferential predation and loss of fragile taxa (either by chemical or microbial processes). Significant variations in the degree of loss of the organic-cemented agglutinants were observed down core. This group is preserved down to 5-10 cm at the shallow OMZ sites and down to greater depths at well-aerated and oligotrophic sites. The lower rate of disintegration of these forms, in the deeper locations of the Red Sea, may be related to low microbial activity. This results in the preservation of increasing numbers of organic-cemented shells down-core.