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  • 1
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 113(2008), 2169-9291
    In: volume:113
    In: year:2008
    In: extent:15
    Description / Table of Contents: A mesoscale eddy formed by the interaction of inflows of Atlantic water (AW) from Fram Strait and the Barents Sea into the Arctic Ocean was observed in February 2005 off the Laptev Sea continental slope by a mooring equipped with a McLane Moored Profiler. The eddy was composed of two distinct, vertically aligned cores with a combined thickness of about 650 m. The upper core of approximately ambient density was warmer (2.6°C), saltier (34.88 psu), and vertically stably stratified. The lower core was cooler (0.1°C), fresher (34.81 psu), neutrally stratified and ~0.02 kg/m3 less dense than surrounding ambient water. The eddy, homogeneous out to a radius of at least 3.4 km, had a 14.5 km radius of maximum velocity, and an entire diameter of about 27 km. We hypothesize that the eddy was formed by the confluence of the Fram Strait and Barents Sea AW inflows into the Arctic Ocean that takes place north of the Kara Sea, about 1100 km upstream from the mooring location. The eddy's vertical structure is likely maintained by salt fingering and diffusive convection. The numerical simulation of one-dimensional thermal and salt diffusion equations reasonably reproduces the evolution of the eddy thermohaline patterns from the hypothesized source area to the mooring location, suggesting that the vertical processes of double-diffusive and shear instabilities may be more important than lateral processes for the evolution of the eddy. The eddy is able to carry its thermohaline anomaly several thousand kilometers downstream from its source location.
    Type of Medium: Online Resource
    Pages: 15 , graph. Darst
    ISSN: 2169-9291
    Language: English
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  • 2
    In: Journal of climate, Boston, Mass. [u.a.] : AMS, 1988, 21(2008), 2, Seite 364-384, 1520-0442
    In: volume:21
    In: year:2008
    In: number:2
    In: pages:364-384
    Description / Table of Contents: Recent observations show dramatic changes of the Arctic atmosphereiceocean system. Here the authors demonstrate, through the analysis of a vast collection of previously unsynthesized observational data, that over the twentieth century the central Arctic Ocean became increasingly saltier with a rate of freshwater loss of 239 ± 270 km3 decade-1. In contrast, long-term (1920-2003) freshwater content (FWC) trends over the Siberian shelf show a general freshening tendency with a rate of 29 ± 50 km3 decade-1. These FWC trends are modulated by strong multidecadal variability with sustained and widespread patterns. Associated with this variability, the FWC record shows two periods in the 1920s-30s and in recent decades when the central Arctic Ocean was saltier, and two periods in the earlier century and in the 1940s-70s when it was fresher. The current analysis of potential causes for the recent central Arctic Ocean salinification suggests that the FWC anomalies generated on Arctic shelves (including anomalies resulting from river discharge inputs) and those caused by net atmospheric precipitation were too small to trigger long-term FWC variations in the central Arctic Ocean; to the contrary, they tend to moderate the observed long-term central-basin FWC changes. Variability of the intermediate Atlantic Water did not have apparent impact on changes of the upperArctic Ocean water masses. The authors’ estimates suggest that ice production and sustained draining of freshwater from the Arctic Ocean in response to winds are the key contributors to the salinification of the upper Arctic Ocean over recent decades. Strength of the export of Arctic ice and water controls the supply of Arctic freshwater to subpolar basins while the intensity of the Arctic Ocean FWC anomalies is of less importance. Observational data demonstrate striking coherent long-term variations of the key Arctic climate parameters and strong coupling of long-term changes in the ArcticNorth Atlantic climate system. Finally, since the high-latitude freshwater plays a crucial role in establishing and regulating global thermohaline circulation, the long-term variations of the freshwater content discussed here should be considered when assessing climate change and variability.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1520-0442
    Language: English
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  • 3
    Online Resource
    Online Resource
    Milton :Taylor & Francis Group,
    Keywords: Polymers-Deterioration. ; Radiochemistry. ; Electronic books.
    Description / Table of Contents: Part of the series "New Concepts in Polymer Science", this volume contains information on the main theoretical and practical problems involved in radiation chemistry of polymers.
    Type of Medium: Online Resource
    Pages: 1 online resource (340 pages)
    Edition: 1st ed.
    ISBN: 9781466563353
    DDC: 620.1920422
    Language: English
    Note: Cover -- Half Title -- Series Page -- Title Page -- Copyright Page -- Table of Contents -- Foreword -- Preface -- Lectori -- Nomenclature -- Introduction -- Chapter 1: Main Concepts, Principles, Methods, and Instrumentation of the Radiation Chemistry of Polymers -- 1.1. Types of Ionizing Radiation -- 1.2. Units of Characteristics of the Radiation Field and the Activity of Radionuclides -- 1.3. Sources of Ionizing Radiation -- 1.3.1. Electron Accelerators -- 1.3.2. Long-Lived Radionuclide Sources -- 1.3.3. Radiation-Chemical Gamma Sources -- 1.3.4. Radiation Contours -- 1.4. Dosimetry -- 1.4.1. Direct Dosimetric Methods -- 1.4.2. Indirect Dosimetric Methods -- 1.5. Interaction of Radiation with Matter -- 1.5.1. Primary and Secondary Radiation-Chemical Processes -- 1.5.2. Reversible and Irreversible Radiation Effects -- 1.5.3. Thermal Effects -- 1.6. Calculation of Radiation-Chemical Yields -- Chapter 2: Radiation-Induced Polymerization -- 2.1. Liquid-State and Gas-State Polymerization -- 2.1.1. Kinetics and Mechanism of Radiation-Induced Polymerization -- 2.1.2. Calculation of the Radiation-Chemical Yields of Polymerization -- 2.1.3. Effect of Various Factors on Radiation-Induced Polymerization -- 2.1.4. Gel Effect -- 2.1.5. Post-Effect -- 2.1.6. Conditions and Mechanism of Free-Radical and Ionic Polymerization -- 2.1.7. Main Features of Radiation-Induced Emulsion Polymerization -- 2.1.8. Co-Polymerization -- 2.1.9. Telomerization -- 2.1.10. Side Processes in Radiation-Induced Polymerization, Caused by Monomer Radiolysis -- 2.2. Solid-State Polymerization -- 2.2.1. Fundamental Features of Radiation-induced Solid-State Polymerization -- 2.2.2. Effect of Temperature on Solid-State Polymerization -- 2.2.3. Post-Polymerization -- 2.2.4. Preparation of Stereoregular Polymers -- 2.3. Polymerization in the Glassy State. , 2.4. Principles of Sensitization of Radiation-Induced Polymerization -- 2.4.1. Sensitization Based on Physical Phenomena -- 2.4.2. Sensitization Based on Chemical Phenomena -- Chapter 3: Radiation-Chemical Transformations of Polymers -- 3.1. Modification of Polymers by Graft Co-Polymerization -- 3.1.1. Methods of Graft Co-Polymerization -- 3.1.2. Mechanism and Kinetics of Graft Co-Polymerization -- 3.1.3. Grafting from the Gas Phase -- 3.1.4. Sensitization of Radiation-Induced Grafting -- 3.1.5. Properties of Graft Co-Polymers -- 3.2. Polymer Structurization -- 3.2.1. Main Relationships and Crosslinking Mechanism of Structurization -- 3.2.2. Methods for the Determination of the Radia-tion- Chemical Yield of Crosslinking -- 3.2.3. Crosslinking of Thermoplastics -- 3.2.4. 'Memory' Effect -- 3.2.5. Effect of the Supermolecular Structure of Polymers on Their Radiation-Induced Crosslinking -- 3.2.6. Vulcanization of Elastomers -- 3.2.7. Curing of Oligomers -- 3.2.8. Sensitization of Radiation-Induced Structurization -- 3.3. Polymer Degradation -- 3.3.1. Radiolysis of Macromolecules -- 3.3.2. Sensitization of Degradation (Scission) Processes -- 3.3.3. Determination of Gc and Gs in the Simultaneous Processes of Crosslinking and Scission -- 3.4. Cyclization of Macromolecules -- 3.5. Polymer-analogous Transformations -- 3.5.1. Surface Oxidation of Polymers -- 3.5.2. Halogenation and Sulphochlorination of Polymers -- 3.5.3. Cis-trans Isomerization of Unsaturated Polymers -- 3.6. Stabilization of Radiation-Modified Polymers -- Chapter 4: Radiation Resistance of Polymers and Polymer Materials -- 4.1. Evaluation of Radiation Resistance -- 4.2. Principles of Increasing Radiation Resistance. Radiation Protection -- 4.2.1. Internal Protection -- 4.2.2. External Protection. Anti-rad Additives -- Chapter 5: Fields of Application of the Radiation Chemistry of Polymers. , 5.1. Principles of Selection of Radiation-Chemical Processes for Industrial Use -- 5.2. Choice of Radiation Sources for Various Types of Processes. Organization of Flow Lines and Integrated Power and Chemical Plants Combined with Nuclear Reactors -- 5.3. Radiation-chemical Polymer Processes -- 5.3.1. Polymerization -- 5.3.2. Telomerization -- 5.3.3. Modification of Polymer Materials by Graft Co-Polymerization -- 5.3.4. Production of Heat-Shrinkable and Heat-Expanding Polymer Materials and Articles -- 5.3.5. Production of Thermally Stable and Mechanically Strong Polymer Materials and Products -- 5.3.6. Vulcanization of Rubber Mixes -- 5.3.7. Production of Self-Adhesive Insulating Materials -- 5.3.8. Curing of Coatings and Paints -- 5.3.9. Production of Composite Materials -- 5.3.10. Production of Polymer Carriers for Biomedical Purposes -- 5.3.11. Polymer Degradation -- 5.3.12. Production of Electron and X-Ray Resists -- 5.3.13. Radiation-Resistant Composites -- 5.3.14. Industrial Sewage Treatment -- 5.3.15. Sterilization of Polymer Products for Medical Purposes -- Conclusion -- Control Questions -- Appendix -- Recommended References -- Subject Index.
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  • 4
    ISSN: 1573-8647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-8647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and experimental chemistry 9 (1975), S. 193-196 
    ISSN: 1573-935X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
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    Unknown
    PANGAEA
    In:  Supplement to: Pertsev, A N; Bortnikov, Nikolay S; Aranovich, L Ya; Vlasov, E A; Beltenev, V E; Ivanov, V N; Simakin, S G (2009): Peridotite-melt interaction under transitional conditions between the spinel and plagioclase facies beneath the Mid-Atlantic Ridge: insight from peridotites at 13°N. Petrologiya, 17(2), 139-153
    Publication Date: 2023-05-12
    Description: Peridotites (diopside-bearing harzburgites) found at 13°N of the Mid-Atlantic Ridge fall into two compositional groups. Peridotites P1 are plagioclase-free rocks with minerals of uniform composition and Ca-pyroxene strongly depleted in highly incompatible elements. Peridotites P2 bear evidence of interaction with basic melt: mafic veinlets; wide variations in mineral composition; enrichment of minerals in highly incompatible elements (Na, Zr, and LREE); enrichment of minerals in moderately incompatible elements (Ti, Y, and HREE) from P1 level to abundances 4-10 times higher toward the contacts with mafic aggregates; and exotic mineral assemblages Cr-spinel + rutile and Cr-spinel + ilmenite in peridotite and pentlandite + rutile in mafic veinlets. Anomalous incompatible-element enrichment of minerals from peridotites P2 occurred at the spinel-plagioclase facies boundary, which corresponds to pressure of about 0.8-0.9 GPa. Temperature and oxygen fugacity were estimated from spinel-orthopyroxene-olivine equilibria. Peridotites P1 with uniform mineral composition record temperature of the last complete recrystallization at 940-1050°C and FMQ buffer oxygen fugacity within the calculation error. In peridotites P2, local assemblages have different compositions of coexisting minerals, which reflects repeated partial recrystallization during heating to magmatic temperatures (above 1200°C) and subsequent reequilibration at temperatures decreasing to 910°C and oxygen fugacity significantly higher than FMQ buffer (delta log fO2 = 1.3-1.9). Mafic veins are considered to be a crystallization product from basic melt enriched in Mg and Ni via interaction with peridotite. The geochemical type of melt reconstructed by the equilibrium with Ca-pyroxene is defined as T-MORB: (La/Sm)_N~1.6 and (Ce/Yb) )_N~2.3 that is well consistent with compositional variations of modern basaltic lavas in this segment of the Mid-Atlantic Ridge, including new data on quenched basaltic glasses.
    Keywords: Archive of Ocean Data; ARCOD; Ashadze-1 Hydrothermal Field, Mid-Atlantic Ridge; Ashadze hydrothermal field; Dredge; DRG; GC; Gravity corer; Mid-Atlantic Ridge at 10-15°N; PL26; PL26-1407; PL26-1411; PL26-1419; PL26-1454; PL26-1478; PL26-1494; PL26-1495; PL26-1520; PL26-1521; Professor Logachev; Television-Grab; TVG
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
    facet.materialart.
    Unknown
    PANGAEA
    Publication Date: 2023-02-08
    Keywords: ARAKAM; Arakamchechen Island; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Lithology/composition/facies
    Type: Dataset
    Format: text/tab-separated-values, 15 data points
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  • 9
    facet.materialart.
    Unknown
    PANGAEA
    Publication Date: 2023-02-08
    Keywords: Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; KREST; Kresta Gulf; Lithology/composition/facies
    Type: Dataset
    Format: text/tab-separated-values, 15 data points
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  • 10
    Publication Date: 2023-05-12
    Keywords: Aluminium oxide; Aluminium oxide, standard deviation; Archive of Ocean Data; ARCOD; Ashadze hydrothermal field; Calcium oxide; Calcium oxide, standard deviation; Calculated; Cerium; Cerium, standard deviation; Chromium(III) oxide; Chromium(III) oxide, standard deviation; Dredge; DRG; Dysprosium; Dysprosium, standard deviation; Electron microprobe (EMP); Elevation of event; Elevation of event 2; Erbium; Europium; Europium, standard deviation; Event label; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Lanthanum; Lanthanum, standard deviation; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Magnesium number; Magnesium number, standard deviation; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Neodymium; Neodymium, standard deviation; Number of observations; PL26; PL26-1454; PL26-1520; Professor Logachev; Rock type; Samarium; Samarium, standard deviation; Sample code/label; Sample type; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Sum; Television-Grab; Titanium; Titanium, standard deviation; Titanium dioxide; Titanium dioxide, standard deviation; TVG; Ytterbium; Ytterbium, standard deviation; Yttrium; Yttrium, standard deviation; Zirconium; Zirconium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 336 data points
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