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  • 1
    Call number: AR 98/21
    Classification: A.3.8.
    Language: English
    Branch Library: GFZ Library
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  • 2
    Call number: SR 90.0061(28)
    In: Berliner geowissenschaftliche Abhandlungen
    Type of Medium: Series available for loan
    Pages: 79 S.
    ISBN: 3496002131
    Series Statement: Berliner geowissenschaftliche Abhandlungen : Reihe A, Geologie und Paläontologie 28
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Publication Date: 2016-11-25
    Description: Abstract
    Keywords: Earth Sciences
    Type: Dataset
    Format: 1906390 Bytes
    Format: 3 Datasets
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  • 4
    Publication Date: 2016-11-25
    Description: Abstract
    Keywords: Hydrology ; Floods
    Type: Dataset
    Format: 745927 Bytes
    Format: 3 Datasets
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  • 5
    Publication Date: 2016-11-25
    Description: Abstract
    Keywords: Earth Sciences ; Paleofloods ; Detrital layers ; Varves ; Climate Dynamics.
    Type: Dataset
    Format: 1206896 Bytes
    Format: 2 Datasets
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  • 6
    Publication Date: 2002-01-01
    Description: The evolution of the oxygen minimum zone within the permanent thermocline of the Arabian Sea (AS) during early and mid-Holocene time was reconstructed from a laminated sediment core taken from the Pakistani continental margin (316 m water depth). A trace metal proxy for water column ventilation (authigenic U) was extracted by principal component analysis from a large dataset of inorganic and total organic carbon (TOC) measurements. This proxy is compared with preservation of lamination and paired benthic-planktonic 14C data. The latter record the {Delta}14C depth gradient in the AS and may provide a sensitive indicator for ventilation by enhanced surface convection. Laminated sediments were preserved between 10 and 7.5 ka bp on the Pakistani continental margin and accumulated authigenic U independently from TOC accumulation. The inferred reducing conditions in the AS thermoline are in agreement with high palaeoproductivity in the western AS upwelling region. Century-scale variability in northern AS surface hydrography (recorded as {delta}18O in planktonic foraminifera) is reflected in the accumulation of authigenic U on the Pakistani margin. The agreement of AS surface conditions, which generally reflect the South Asian monsoon (SAM), with ventilation of the OMZ confirms a dominant influence of the SAM and summer monsoon upwelling in particular on AS thermocline ventilation during early Holocene time. However, the preservation of laminated sediments off Pakistan and palaeoproductivity in the western AS disagree before 10 ka cal. bp, and between 7.5 and 5.5 cal. ka bp. Here, the absence of lamination indicates better ventilation of the thermocline, whereas palaeoproductivity in the upwelling region was high. This suggests that other factors may also have contributed in variable proportions to AS thermocline ventilation. At present, these factors include lateral advection of oxygenated Central Indian Water and ventilation by winter surface convection in the northern AS.
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  • 7
    Publication Date: 2014-09-03
    Description: From November 2006 to January 2010, a sediment trap that was cleared monthly was deployed in Lake Challa, a deep stratified freshwater lake on the eastern slope of Mt. Kilimanjaro in southern Kenya. Geochemical data from sediment trap samples were compared with a broad range of limnological and meteorological parameters to characterize the effect of single parameters on productivity and sedimentation processes in the crater basin. During the southern hemisphere summer (November–March), when the water temperature is high and the lake is biologically productive (nondiatom algae), calcite predominated in the sediment trap samples. During the “long rain” season (March–May) a small amount of organic matter and lithogenic material caused by rainfall appeared. This was followed by the cool and windy months of the southern hemisphere winter (June–October) when diatoms were the main component, indicating a diatom bloom initiated by improvement of nutrient availability related to upwelling processes. The sediment trap data support the hypothesis that the light–dark lamination couplets, which are abundant in Lake Challa cores, reflect seasonal delivery to the sediments of diatom-rich particulates during the windy months and diatom-poor material during the wet season. However, interannual and spatial variability in upwelling and productivity patterns, as well as El Niño–Southern Oscillation (ENSO)-related rainfall and drought cycles, exert a strong influence on the magnitude and geochemical composition of particle export to the hypolimnion of Lake Challa.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 8
    Publication Date: 2017-01-13
    Description: The Yermak Plateau is a prominent bathymetric feature of the Arctic Ocean. To the west it is bordered by the Fram Strait, which forms the only deep-water connection between the Arctic and the other global oceans. Origin, crustal nature and age of the Yermak Plateau are largely unknown. For this study, we investigated dredged rocks of two sites from the Yermak Plateau. Based on petrography, geochemistry, and geochronology, we distinguished between ice-transported and in-situ rocks. Ice-transported material was most likely derived from outcrops of the High Arctic Large Igneous Province (HALIP) on Franz Josef Land, the Siberian trap province, and presumably from northern Svalbard. Our data from the in-situ rocks, in conjunction with previously published geophysical data, show that the investigated parts of the Yermak Plateau are composed of stretched continental crust strongly affected by alkaline magmatism. The continental rocks represent a direct continuation of the exposures on northern Svalbard. Alkaline magmatism took place at ~ 51 Ma and was related to continental rifting in an extensional setting. The melts were formed by low degrees of partial melting of the sub-continental lithospheric mantle and are probably associated with the high-amplitude magnetic anomalies described for the northeastern Yermak Plateau. Extension of the Yermak Plateau was contemporaneous with spreading of the adjacent young Eurasian Basin, and occurred during the peak of compressional deformation affecting North Greenland, Svalbard, and Ellesmere Island. These contrasting regimes were probably compensated by transpression and strike-slip movements along the DeGeer and Wegener Faults. The date of ~ 51 Ma for extension-related magmatism also provides age constraints for the extension-related formation of the Sophia Basin (and thus for water exchange between the Eurasian Basin, the area of the DeGeer Fault and the young Norwegian-Greenland Sea), and for the sediments covering the horst-and-graben structures of the Yermak Plateau.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 9
    Publication Date: 2016-11-25
    Description: Abstract
    Description: Investigation of the sedimentary record of pre-Alpine Lake Mondsee (Upper Austria) focused on the environmental reaction to rapid Lateglacial climatic changes. Results of this study reveal complex proxy responses that are variable in time and influenced by the long-term evolution of the lake and its catchment. A new field sampling approach facilitated continuous and precisely controlled parallel sampling at decadal to sub-annual resolution for m-XRF element scanning, carbon geochemistry, stable isotope measurements on ostracods, pollen analyses and large-scale thin sections for microfacies analysis. The Holocene chronology is established through microscopic varve counting and supported by accelerator mass spectrometric 14C dating of terrestrial plant macrofossils, whereas the Lateglacial age model is based on d18O wiggle matching with the Greenland NGRIP record, using the GICC05 chronology. Microfacies analysis enables the detection of subtle sedimentological changes, proving that depositional processes even in rather large lake systems are highly sensitive to climate forcing. Comparing periods of major warming at the onset of the Lateglacial and Holocene and of major cooling at the onset of the Younger Dryas reveals differences in proxy responses, reflecting threshold effects and ecosystem inertia. Temperature increase, vegetation recovery, decrease of detrital flux and intensification of biochemical calcite precipitation at the onset of the Holocene took place with only decadal leads and lags over a ca. 100 a period, whereas the spread of woodlands and the reduction of detrital flux lagged the warming at the onset of the Lateglacial Interstadial by ca. 500-750 a. Cooling at the onset of the Younger Dryas is reflected by the simultaneous reaction of d18O and vegetation, but sedimentological changes (reduction of endogenic calcite content, increase in detrital flux) were delayed by about 150-300 a. Three short-term Lateglacial cold intervals, corresponding to Greenland isotope substages GI-1d, GI-1c2 and GI-1b, also show complex proxy responses that vary in time.
    Language: English
    Type: Dataset , Dataset
    Format: 6 Datasets
    Format: application/xls
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  • 10
    Publication Date: 2017-10-24
    Description: Anhand von 18 Kurzkernen aus der Talsperre Lehnmühle (Inbetriebnahme 1932) im Osterzgebirge (Deutschland) wurden mittels mikrofaziellen und hochauflösenden μ-XRF Scanning Verfahren Auswirkungen des extremen Augusthochwassers 2002 auf den Sedimenteintrag untersucht. Fast über den gesamten Talsperrenboden hinweg wurde eine für die gesamte Sedimentsequenz einmalig markante detritische Lage detektiert, welche eine Mächtigkeit von 5 mm an der Staumauer bis 33 mm nahe dem Zufluss misst. Die eingetragene Sedimentmenge dieser Lage wird auf ca. 2.400 Tonnen geschätzt, wovon etwa zwei Drittel im südlich-zentralen Teil des Beckens (ca. 32 % der Gesamtfläche) abgelagert wurden, begründet durch die Beckenmorphologie und die Lage zum Zufluss. Feine Silt- und Tonpartikel wurden dagegen vornehmlich weiter in Richtung Staumauer transportiert, forciert durch eine ständige Wasserströmung durch das Staubecken. Eine erhöhte Akkumulation von detritischem Material in einer seitlichen Bucht zeigt, dass Sedimente nicht nur durch den Hauptzufluss eingetragen wurden, sondern ebenfalls durch Oberflächenabfluss in nicht ständig wasserführenden Rinnen um die Talsperre herum. Neben der markanten Lage des Jahres 2002, wurden 22 weitere, mikroskopisch dünne detritische Lagen in den Sedimentkernen nachgewiesen, die meisten im Profundalbereich nahe der Staumauer. Eine Chronologie der detritischen Lagen wurde an drei 137Cs datierten Kernsequenzen erstellt und durch detaillierte Korrelation mittels vier lithologischer Marker auf die übrigen Kerne übertragen. Der Vergleich mit instrumentellen Abflussdaten des Hauptzuflusses zeigt, dass während der letzten drei Jahrzehnte 64 % von insgesamt 22 Hochwasserereignissen mit einem Tagesabfluss 〉 8 m3s-1 in die Ablagerung von detritischem Material resultierten.
    Description: research
    Keywords: lake sediments ; flood events ; detrital layers ; microfacies analysis ; eastern Erzgebirge ; water supply reservoir
    Language: English
    Type: article , Verlagsversion
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