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  • 1
    Call number: AWI G5-96-0326
    In: NATO ASI series : I, Global and environmental change, Vol. 17
    Type of Medium: Monograph available for loan
    Pages: XII, 580 Seiten , Illustrationen
    ISBN: 3540575944
    Series Statement: NATO ASI series : I, Global and environmental change 17
    Language: English
    Note: TABLE OF CONTENTS FOREWORD LIST OF AUTHORS AND PARTICIPANTS I - OPERATION OF THE OCEAN-ATMOSPHERE CARBON CYCLE The recent state of carbon cycling through the atmosphere / I. Levin Glacial ocean carbon cycle modeling / Ch. Heinze Glacial-interglacial changes in continental weathering: possible implication for atmospheric CO2 / G. Munhoven and L.M.François II - VARIATIONS OF THE OCEANS CARBON RESERVOIR: FAUNAL VERSUS GEOCHEMCAL RECORDS The relationship between surface water masses, oceanographic fronts and paleoclimatic proxies in surface sediments of the Greenland, Iceland, Norwegian Seas / T. Johannessen, E. Jansen, A. Flatrøy, A. C. Ravelo. - Is there a relationship between atmospheric CO2 and manganese in the ocean? / A. Mangini, H.-J. Rutsch, M. Frank, A. Eisenhauer, J.-D. Eckhardt Benthic foraminiferal assemblages and the δ13C-signal in the Atlantic sector of the Southern Ocean: glacial-to-interglacial contrasts / A. Mackensen, H. Grobe, H.-W. Hubberten, G. Kuhn Foraminiferal population dynamics and stable carbon isotopes / Ch. Hemleben and J. Bijma A comparison of carbon isotopes and cadmium in the modern and glacial maximum ocean: can we account for the discrepancies? / E. A. Boyle Tracer-nutrient correlations in the upper ocean: observational and box model constraints on the use of benthic foraminiferal δ13C and Cd/Ca as paleo-proxies for the intermediate-depth ocean / R. Zahn and R. Keir IIΙ - GEOCHEMISTRY OF THE ORGANIC SEDIMENT FRACTION: CONSTRAINTS ON THE BIOLOGICAL CARBON PUMP Possible early diagenetic alteration of palaeo proxies / G.J. De Lange, B. Van Os, P.A. Pruysers, J.J. Middelburg, D. Castradori, P. Van Santvoort, P.J. Müller, H. Eggenkamp, F.G. Prahl Nitrogen isotope fractionation in the modern ocean: implications for the sedimentary record / J. P. Montoya The use of nitrogen isotopic ratio for reconstruction of past changes in surface ocean nutrient utilization / M.A. Altabet and R. Francois Variations in sedimentary organic δ13C as a proxy for past changes in ocean and atmospheric CO2 concentrations / G. H. Rau Reconstruction of paleoceanic PCO2 levels from carbon isotopic compositions of sedimentary biogenic components /J.P. Jasper and J.M. Hayes Late Quaternary PCO2 variations in the Angola Current: evidence from organic carbon δ13C and alkenone temperatures / P.J. Müller, R. Schneider, G. Ruhland PCO2 variations of equatorial surface water over the last 330,000 years: the δ13C record of organic carbon / L. Westerhausen, M. Sarnthein, U. Struck, H. Erlenkeuser, J. Poynter IV - GEOCHEMICAL AND MICROPALEONTOLOGICAL INDEXES OF PALEO-PRODUCTIVITY Paleoproductivity: flux proxies versus nutrient proxies and other problems concerning the Quaternary productivity record / W.H. Berger, J.C. Herguera, C.B. Lange, R. Schneider From modern flux to paleoflux: assessment from sinking assemblages to thanatocoenosis / K. Takahashi Late Quaternary paleoproductivity variations in the NE and equatorial Atlantic: diatom and Corg evidence / F. Abrantes, K. Winn, M. Sarnthein Glacial-Holocene paleoproductivity off western Australia: a comparison of proxy records / D.C. McCorkle, H. H. Veeh, D.J. Heggie Nutrient, mixing and export indices: A 250 Kyr paleoproductivity record from the western equatorial Pacific / J.C. Herguera Dinoflagellate cysts as paleoproductivity indicators: state of the art, potential, and limits / B. Dale and A. Fjeliså Deep-sea benthic foraminifers: food and bottom water masses / D. Schnitker The history of barium, biogenic silica and organic carbon accumulation in the Weddell Sea and Antarctic Ocean over the last 150,000 years / G. Shimmield, S. Derrick, A. Mackensen, H. Grobe, C. Pudsey SUBJECT INDEX
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  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Palaeocene/Eocene thermal maximum represents a period of rapid, extreme global warming ∼55 million years ago, superimposed on an already warm world. This warming is associated with a severe shoaling of the ocean calcite compensation depth and a 〉2.5 per mil negative carbon ...
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 442, 671–675 (2006) We omitted the names of the following authors of this Letter: Jens Matthiessen, Kathryn Moran and Ruediger ...
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  • 4
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The history of the Arctic Ocean during the Cenozoic era (0–65 million years ago) is largely unknown from direct evidence. Here we present a Cenozoic palaeoceanographic record constructed from 〉400 m of sediment core from a recent drilling expedition to the Lomonosov ridge in the Arctic ...
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  • 5
    ISSN: 1573-7470
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The paper identifies a problem in default reasoning in Reiter’s Default Logic and related systems: elements which are similar given the axioms only, become distinguishable in extensions. We explain why, sometimes, this is considered undesirable. Two approaches are presented for guaranteeing similarity preservation: One approach formalizes a way of uniformly applying the defaults to all similar elements by introducing generic extensions, which depend only on similarity types of objects. According to the second approach, for a restricted class of default theories, a default theory is viewed as a “shorthand notation” to what is “really meant” by its formulation. In this approach we propose a rewriting of defaults in a form that guarantees similarity preservation of the modified theory. It turns out that the above two approaches yield the same result.
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  • 6
    ISSN: 1573-7470
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract It is shown that the translation of an open default $$\frac{{\alpha (x):M\beta _1 (x),...,M\beta _m (x)}}{{w(x)}}$$ into a modal formula ∀x(Lα(x)∧LMβ 1 (x)∧...∧LMβ m (x)⊃w(x)) gives rise to an embedding of open default systems into non-monotonic logics.
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  • 7
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    Kluwer
    In:  In: Paleoecology, Biostratigraphy, Paleoceanography and Taxonomy of Agglutinated Foraminifera. , ed. by Hemleben, C. NATO ASI series: Series C, Mathematical and physical sciences, 327 . Kluwer, Dordrecht, pp. 3-11.
    Publication Date: 2016-10-07
    Description: Unicellular protozoans are among the oldest fossils which we can recognize from the Precambrian. Presumably, foraminiferal ancestors were among the earliest of them, but had not yet benefitted from being sheltered by a biomineralized test. During the earliest Cambrian the first agglutinating foraminifera made their first appearance in the geologic record. These “primitive” forms built their test of foreign particles held together by an organic cement. This organic cement may have been secreted by the foraminifer in cytoplasmic vacuoles as is the case with Recent agglutinating foraminifera. Yet, the capability to biomineralize calcite did not evolve until after another 60 million years when the fusulinids developed their microgranular wall. Calcitic cemented agglutinates occur even later, at the base of the Carboniferous. Thus, in the fossil record the agglutinated foraminifera occur as a twofold group with a rather distinct evolution.
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta informatica 35 (1998), S. 245-267 
    ISSN: 1432-0525
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. In this paper we introduce context-free grammars and pushdown automata over infinite alphabets. It is shown that a language is generated by a context-free grammar over an infinite alphabet if and only if it is accepted by a pushdown automaton over an infinite alphabet. Also the generated (accepted) languages possess many of the properties of the ordinary context-free languages: decidability, closure properties, etc.. This provides a substantial evidence for considering context-free grammars and pushdown automata over infinite alphabets as a natural extension of the classical ones.
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  • 9
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract The stratigraphic and biogeographic distribution of more than 170 species of deep-water agglutinated benthic foraminifers (DWAF) from the North Atlantic and adjacent marginal seas has been compared with paleoenvironmental data (e.g. paleobathymetry, oxygenation of the bottom waters, amount of terrigenous input and substrate disturbance). Six general types of assemblages, in which deep water agglutinated taxa occur, are defined from the Turonian to Maastrichtian times: 1. High latitude slope assemblages 2. Low to mid latitude slope assemblages 3. Flysch-type assemblages 4. Deep water limestone assemblages (»Scaglia«-type) 5. Abyssal mixed calcareous-agglutinated assemblages 6. Abyssal purely agglutinated assemblages Latitudinal differences in faunal composition are observed, the most important of which is the lack or extreme paucity of calcareous forms in high latitude assemblages. East-to-west differences appear to be of comparatively minor importance. Most DWAF species occur in all studied regions and are thus considered as cosmopolitan. Biostratigraphic turnovers in the taxonomic content of assemblages are observed in the lowermost Turonian, mid- Campanian and in the upper Maastrichtian to lowermost Paleocene. These datum levels correspond to inter-regional and time-constant paleooceanographic events, which probably also affected the deep-water benthic biota. This allows us to use deep-water agglutinated foraminifers for biostratigraphy in the North Atlantic sequences deposited below CCD and to geographically extend the currently used zonal schemes which have been established in the Carpathian and Alpine areas.
    Abstract: Résumé La répartition stratigraphique et biogéographique de plus de cent soixante dix espèces de foraminifères benthiques agglutinants d'eaux profondes de l'Océan Atlantique Nord et des mers adjacentes a été examinée en fonction des paramètres du paléoenvironnement (paléobathymétrie, oxygénation et dynamique des eaux de fond, apports détritiques terrigènes). Sur une période s'étendant du Turonien au Maestrichtien, six types principaux d'associations, comprenant en tout ou partie des taxons agglutinants profonds, ont été définis: 1. associations de talus en haute latitude 2. associations de talus en basse latitude 3. associations de type flysch 4. associations de calcaires pélagiques (type »Scaglia«) 5. associations abyssales de type mixte avec foraminifères à test calcaire et foraminifères agglutinants 6. associations abyssales uniquement composées d'agglutinants. Des différences latitudinales sont apparues dans la composition faunique: la plus importante réside dans l'absence ou la très grande rareté des formes à test calcaire dans les associations de haute latitude. Des différences en longitude, d'est en ouest, apparaissent comparativement d'importance mineure. La plupart des espèces de foraminifères agglutinants d'eaux profondes se rencontrent dans toutes les régions étudiées et peuvent donc être considérées comme ubiquistes. De nettes coupures biostratigraphiques, fondées sur des renouvellements fauniques, sont décelées au Turonien basal, au Campanien moyen et au passage Meastrichtien supérieur-Paléocène basal. Ces niveaux repères correspondent à des événements paléo-océanographiques isochrones et d'extension supra-régionale, qui ont probablement affecté aussi les formes benthiques d'eaux profondes. Ceci nous incite à utiliser les foraminifères benthiques profonds pour la biostratigraphie des séries Nord-Atlantique déposées sous la CCD et par corrélation nous permet d'étendre géographiquement l'usage de zonations initialement définies dans le domaine alpino-carpathique.
    Notes: Zusammenfassung Die stratigraphische und biogeographische Verbreitung von mehr als 170 Arten sandschaliger benthischer Tiefwasser-Foraminiferen wurde im Nordatlantik und seinen Randmeeren untersucht. Hierbei wurden die in den einzelnen Untersuchungsgebieten unterschiedlichen Paläoenvironment- Bedingungen (Wassertiefe, Sauerstoffverhältnisse am Ozeanboden, detritischer Eintrag und Beeinträchtigung des Substrats durch Strömungs- und Sedimentationsprozesse) zu der jeweiligen taxonomischen Zusammensetzung der agglutinierenden Benthos-Fauna in Beziehung gesetzt. Für den Zeitraum vom Turon bis zum Maastricht ließen sich zwölf charakteristische Vergesellschaftungen agglutinierender Tiefwasser-Foraminiferen unterscheiden, die in sechs Hauptgruppen zusammengefaßt werden können: 1. Kontinentalhang-Vergesellschaftungen hoher Breiten 2. Kontinentalhang-Vergesellschaftungen niedriger bis mittlerer Breiten 3. Flysch-Vergesellschaftungen 4. Vergesellschaftungen pelagischer Kalke (»Scaglia«-Typ) 5. Abyssale gemischt kalkschalige und agglutinierende Benthos-Vergesellschaftungen 6. Abyssale rein agglutinierende Vergesellschaftungen Biogeographische Unterschiede in der Faunenzusammensetzung korrelieren vor allem mit der geographischen Breite, wobei besonders das Fehlen kalkschaliger Elemente in Faunen hoher Breiten auffällt. Ost-West-Unterschiede sind von geringerer Bedeutung, die Mehrzahl der Arten tritt in allen untersuchten Gebieten auf und kann als kosmopolitisch angesehen werden. Faunenschnitte können im basalen Turon, im mittleren Campan und an der Kreide/Tertiär-Grenze beobachtet werden. Diese Zeitabschnitte sind durch überregionale paläoozeanographische Events charakterisiert, die wahrscheinlich auch das Tiefsee-Benthos beeinflußt haben. Dieser Zusammenhang zwischen der Evolution agglutinierender Tiefsee- Foraminiferen und globalen, zeitkonstanten Events ermöglicht eine biostratigraphische Gliederung der Sub-CCD Serien des Nordatlantik mit Hilfe sandschaliger Foraminiferen, die sich weitgehend mit den Zonierungen, die in den Flyschzonen der Karpathen und Alpen entwickelt wurden, korrelieren läßt.
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  • 10
    Publication Date: 2016-04-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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