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  • GEOMAR Catalogue / E-Books  (2)
  • Data  (139)
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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Paleoclimatology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (485 pages)
    Edition: 1st ed.
    ISBN: 9783030249823
    Series Statement: Frontiers in Earth Sciences Series
    Language: English
    Note: Intro -- Foreword -- Introduction -- Preface -- Contents -- About the Editors -- 1 The Climate System: Its Functioning and History -- Climate Change -- Definition of Climate -- Climate Changes in the Past -- Climate Mechanisms -- The Radiation Balance of the Earth -- The Greenhouse Effect -- The Water Cycle -- Sun-Related Variability -- Solar Cycles -- Long-Term Variations in the Movement of the Earth Around the Sun -- The Sun's Evolution -- Reconstruction of the History of Atmospheric Composition -- The Atmosphere -- The Main Features of Atmospheric Circulation -- Water Vapor, Clouds and Rainfall -- Reconstructing Changes in Precipitation -- Modes of Variability of the Atmosphere -- The Oceans -- Main Characteristics of the Oceans -- Oceanic Circulation -- Reconstructing Ocean Circulation in the Past -- El Niño, Interplay Between the Atmosphere and the Oceans -- The Terrestrial and Marine Biosphere -- The Geographical Distribution of the Biosphere -- The Role of the Biosphere -- Biosphere of the Past and Paleoclimates -- The Cryosphere -- The Role of the Cryosphere -- The Cryosphere in the Past and Paleoclimates -- The Lithosphere: Over Large Timescales -- The Climate System -- References -- 2 The Changing Face of the Earth Throughout the Ages -- Paleogeographic Reconstructions -- Continental Drift -- The Paleomagnetic Tool, Tests and Uncertainties -- The Topography of the Earth -- The Evidence from Flora -- The Evidence from Erosion Sediment -- Stable Isotope Paleoaltimetry -- Eustatic Variations and Ocean Gateways -- An Overview of the Changing Face of Earth Through the Ages -- Conclusion -- References -- 3 Introduction to Geochronology -- 4 Carbon-14 -- Principles of the Radiocarbon Method -- Discovery of the Method -- Principle of the 14C Dating Method -- Estimation of the Half-Life and the First 14C Dating -- Principle of the Method. , Validity of the Assumptions and Definition of a Reference Standard for the Atmosphere -- Calibration of the 14C Ages -- Methods and Results -- Examples of Precise Calibration of 14C Ages -- The Dating of the Eruption of Santorini -- The Bipolar Seesaw or the North-South Heat Transfer -- Apparent Ages -- Oceanic Environments: The Reservoir Ages -- Continental Environments: The Hard Water and Dead Carbon Effects -- The 14C Exchanges in the Carbon Reservoirs -- Examples of Simulation of Modern Oceanic Circulation -- Oceanic Paleocirculation -- Mineralization of Organic Matter in Soil -- Treatment of Samples and Calculations of 14C Ages -- Physical-Chemical Treatment -- Determination of a 14C Age -- Some Examples of Post-depositional Disturbances of the 14C Ages -- References -- 5 The 40K/40Ar and 40Ar/39Ar Methods -- Principles of the K-Ar Method -- Diagram of Radioactive Decay in 40K -- The Age Equation -- Operation of the Potassium-Argon Clock -- Datable Materials and Age Ranges -- The Unspiked K-Ar Method -- Selection and Preparation of the Samples -- Determining 40Ar* -- Example of a Calculation of Age -- The 40Ar/39Ar Method: General Principles -- The Age Equation -- Corrections for Atmospheric Argon and Interference of Mass -- The Age Spectra -- The Single Grain Method -- The Isochrones -- Selection and Preparation of Samples -- Mass-Spectrometric Analysis -- Calculation of Age -- Advantages and Limitations of the 40K/40Ar and 40Ar/39Ar Methods -- Application: Example of the Dating of the Laschamp Event -- References -- 6 Dating of Corals and Other Geological Samples via the Radioactive Disequilibrium of Uranium and Thorium Isotopes -- Abstract -- Methodology of 230Th/238U Dating -- Principle of 230Th/238U Dating -- Selecting a Coral for 230Th/238U Dating -- Chemical Procedure -- Physical Measurement by Mass Spectrometry. , Limitations of the Method -- The Nuclear Recoil Effect and the 'Open' Dating System -- The Open System: Empirical Model -- Estimating the Change in Sea Level from Tropical Corals -- Other Geological Samples Datable by the U/Th Method -- Conclusions -- References -- 7 Magnetostratigraphy: From a Million to a Thousand Years -- Establishing the Scale of Magnetic Polarities -- First Coupled Measurements: Magnetization of Volcanic Rocks-K/Ar Dating -- the McDougall and Tarling Scale and the Mankinen and Dalrymple Scale for the Plio-Pleistocene -- Magnetic Stratigraphy in Pliocene-Pleistocene Sedimentary Series -- Magnetic Anomalies at Sea and the Heirtzler Scale of Magnetic Polarities -- The Cande and Kent Polarity Scale -- Astronomical Calibration of the Polarity Scale -- Principle and Practice of Magnetostratigraphy -- A High-Quality Magnetostratigraphic Study: The Siwalik Sequences in Pakistan -- Geomagnetic Excursions and the Scale of Magnetic Instabilities (GITS) -- Discovery of Geomagnetic Excursions -- A Scale of Geomagnetic Instabilities? -- Magnetostratigraphy Based on Variations in the Intensity of the Geomagnetic Field -- Introduction -- A Correlation Between Sediment and Polar Ice -- Paleo-Oceanographic Implications of High-Resolution Magnetic-Assisted Stratigraphy -- Conclusions -- References -- 8 Dendrochronology -- A Bit of Botany and Ecology -- Crossdating -- Temporal and Spatial Extension -- Contribution of 14C to Calibration -- References -- 9 The Dating of Ice-Core Archives -- Ice-Air Age Difference -- Introduction -- Modeling the Densification of the Firn -- Application of the 15N and 40Ar Isotopes in the Bubbles -- Synchronization of Two Ice Cores -- The Counting of Annual Layers -- Identification of Dated Horizons -- Volcanic Horizons -- Dansgaard-Oeschger Events -- Variations in the Magnetic Field and in Solar Activity. , Orbital Tuning and Indicators of Local Insolation -- Flow Modeling -- Evaluation of Accumulation on the Surface -- Ice Flow Models -- The Limitations of Modeling -- The Inverse Method: A Collective Approach -- Conclusion -- References -- 10 Reconstructing the Physics and Circulation of the Atmosphere -- Interpretation of Records, Limitations and Uncertainties -- Uncertainties on the Temporal Scale -- Uncertainties Associated with Geochemical Indicators: The Specific Case of the Isotopic Composition of Precipitations -- Uncertainties Associated with Biological Indicators -- References -- 11 Air-Ice Interface: Polar Ice -- Melt Index and Borehole Temperatures -- Stable Isotopes of Water and Temperature -- Stable Isotopes of Air and Temperature -- Conclusions -- References -- 12 Air-Vegetation Interface: Pollen -- From the Production of Pollen to Sediment -- The Pollen Diagram -- Reconstruction of Climate -- References -- 13 Ground-Air Interface: The Loess Sequences, Markers of Atmospheric Circulation -- Abstract -- Overview of Loess -- Paleoclimate Indicators -- Sedimentological Indicators -- Biological Indicators -- Geophysical Indicators -- Geochemical Indicators -- Loess Chronology -- References -- 14 Air-Ground Interface: Reconstruction of Paleoclimates Using Speleothems -- Speleothems: Description, Distribution, Formation and Preservation -- Growth and Chronology of Speleothems -- Paleoclimate Reconstruction: A Qualitative Approach -- Paleoclimate Reconstruction: A Quantitative Approach -- Conclusion -- References -- 15 Air-Interface: δ18O Records of Past Meteoric Water Using Benthic Ostracods from Deep Lakes -- Introduction -- Existing Deep-Lake Oxygen-Isotope Records -- Hydro-Meteorological Effects -- The Isotopic Composition of Atmospheric Precipitation -- Catchment Effects -- Lake Water Balance Effects -- Transient Changes and Dynamic Effects. , Isotope Geochemistry of Benthic Freshwater Ostracods -- Vital Effects -- Water Temperature Effects -- The Fossil Ostracod Record -- Calibration Against the Instrumental Air Temperature Record -- The Record of δ18OP in Central Europe Over the Past 15,000 Years -- Late Glacial and Early Holocene Shallow-Water Temperatures -- Quantification of Hydrological Effects -- Conclusions -- Perspectives -- References -- 16 Vegetation-Atmosphere Interface: Tree Rings -- A Dendrochonological Approach -- Dendro-isotopic Analysis -- Isotopic Reconstruction of the Variations in Climate Parameters Over Time -- References -- 17 Air-Vegetation Interface: An Example of the Use of Historical Data on Grape Harvests -- Historical Series of Harvest Dates -- Reconstruction of Spring-Summer Temperatures Based on Grape Harvesting Dates -- Limitations of These Reconstructions: The Anthropic Effects -- References -- 18 Air-Ground Interface: Sediment Tracers in Tropical Lakes -- Intertropical Hydrological Variability in Africa -- Sahara, Kalahari and Arid Zones: Discontinuous Evidence of Hydrological Inversions -- (Sub)Equatorial Zone: Changes in the Activity and Position of the ITCZ -- Recent Anthropological Influence on Climate Archives: Both a Proof and a Tool to Assess the Impacts of Local and Regional Development -- References -- 19 Air-water Interface: Tropical Lake Diatoms and Isotope Hydrology Modeling -- Site Selection and Collection of Samples -- Reconstruction of Paleohydrological Conditions -- Quantification of the Oxygen Isotopic Composition of Lakes -- Hydro-Isotopic Modeling and Paleoclimatic Interpretation -- References -- 20 Air-Ice Interface: Tropical Glaciers -- Paleoclimate Markers -- Some Important Results from the Interpretation of Andean Isotopic Records -- References -- 21 Climate and the Evolution of the Ocean: The Paleoceanographic Data. , Introduction: The Development of Tools and Concepts.
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  • 2
    Keywords: Climate change. ; Paleontology . ; Physical geography. ; Geology. ; Paläoklimatologie ; Geochronologie ; Methode ; Oberproterozoikum ; Eiszeit ; Paläoklima ; Pleistozän ; Treibhausgas ; Klimaänderung ; Phanerozoikum ; Holozän ; Klimaschwankung
    Description / Table of Contents: 1. The climate system: its functioning and history -- 2. The changing face of the Earth throughout the ages -- 3. Introduction to geochronology -- 4. Carbon-14.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (xxiv, 478 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9783030249823
    Series Statement: Frontiers in earth sciences
    Language: English
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  • 3
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    PANGAEA
    In:  Supplement to: Collins, James A; Schefuß, Enno; Govin, Aline; Mulitza, Stefan; Tiedemann, Ralf (2014): Insolation and glacial–interglacial control on southwestern African hydroclimate over the past 140 000 years. Earth and Planetary Science Letters, 398, 1-10, https://doi.org/10.1016/j.epsl.2014.04.034
    Publication Date: 2023-03-03
    Description: The past climate evolution of southwestern Africa is poorly understood and interpretations of past hydrological changes are sometimes contradictory. Here we present a record of leaf-wax dD and View the MathML source taken from a marine sediment core at 23°S off the coast of Namibia to reconstruct the hydrology and C3 versus C4 vegetation of southwestern Africa over the last 140 000 years (140 ka). We find lower leaf-wax dD and higher View the MathML source (more C4 grasses), which we interpret to indicate wetter Southern Hemisphere (SH) summer conditions and increased seasonality, during SH insolation maxima relative to minima and during the last glacial period relative to the Holocene and the last interglacial period. Nonetheless, the dominance of C4 grasses throughout the record indicates that the wet season remained brief and that this region has remained semi-arid. Our data suggest that past precipitation increases were derived from the tropics rather than from the winter westerlies. Comparison with a record from the Congo Basin indicates that hydroclimate in southwestern Africa has evolved in antiphase with that of central Africa over the last 140 ka.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 4
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    PANGAEA
    In:  Supplement to: Razik, Sebastian; Govin, Aline; Chiessi, Cristiano Mazur; von Dobeneck, Tilo (2015): Depositional provinces, dispersal, and origin of terrigenous sediments along the SE South American continental margin. Marine Geology, 363, 261-272, https://doi.org/10.1016/j.margeo.2015.03.001
    Publication Date: 2023-03-03
    Description: Continental margin sediments of SE South America originate from various terrestrial sources, each conveying specific magnetic and element signatures. Here, we aim to identify the sources and transport characteristics of shelf and slope sediments deposited between East Brazil and Patagonia (20°-48°S) using enviromagnetic, major element, and grain-size data. A set of five source-indicative parameters (i.e., chi-fd%, ARM/IRM, S0.3T, SIRM/Fe and Fe/K) of 25 surface samples (16-1805 m water depth) was analyzed by fuzzy c-means clustering and non-linear mapping to depict and unmix sediment-province characteristics. This multivariate approach yields three regionally coherent sediment provinces with petrologically and climatically distinct source regions. The southernmost province is entirely restricted to the slope off the Argentinean Pampas and has been identified as relict Andean-sourced sands with coarse unaltered magnetite. The direct transport to the slope was enabled by Rio Colorado and Rio Negro meltwaters during glacial and deglacial phases of low sea level. The adjacent shelf province consists of coastal loessoidal sands (highest hematite and goethite proportions) delivered from the Argentinean Pampas by wave erosion and westerly winds. The northernmost province includes the Plata mudbelt and Rio Grande Cone. It contains tropically weathered clayey silts from the La Plata Drainage Basin with pronounced proportions of fine magnetite, which were distributed up to ~24° S by the Brazilian Coastal Current and admixed to coarser relict sediments of Pampean loessoidal origin. Grain-size analyses of all samples showed that sediment fractionation during transport and deposition had little impact on magnetic and element source characteristics. This study corroborates the high potential of the chosen approach to access sediment origin in regions with contrasting sediment sources, complex transport dynamics, and large grain-size variability.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
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    PANGAEA
    In:  Supplement to: Santos, Thiago Pereira dos; Lessa, Douglas Villela de Oliveira; Venancio, Igor Martins; Chiessi, Cristiano Mazur; Mulitza, Stefan; Kuhnert, Henning; Govin, Aline; Machado, Thiago; Costa, Karen Badaraco; Toledo, Felipe Antonio de L; Dias, Bruna Borba; Albuquerque, Ana Luiza Spadano (2017): Prolonged warming of the Brazil Current precedes deglaciations. Earth and Planetary Science Letters, 463, 1-12, https://doi.org/10.1016/j.epsl.2017.01.014
    Publication Date: 2023-01-13
    Description: Paleoceanographic reconstructions from the Brazil Current are scarce and lack the required temporal resolution to appropriately represent its variability during key periods of the last glacial-interglacial cycles. Here, we present the first high-temporal resolution multiproxy reconstruction of the Brazil Current at 24 °S covering the last 185 ka. During the last and penultimate glacial periods, our Mg/Ca-derived sea surface temperature (SST) record shows a strong cooling at ca. 47 and ca. 156 ka, respectively, that is followed by a warming trend from late-Marine Isotope Stage (MIS) 3 to MIS 1 and from late-MIS 6 to MIS5e, respectively. Importantly, the Brazil Current warmed uninterruptedly towards Termination I (II) after the low SST at ca. 47 and ca. 156 ka, with no SST minima during the Last Glacial Maximum or penultimate glacial maximum. The reason for the strong cooling and the warming trend during late-MIS 3 and late-MIS 6 could reside in the favorable obliquity configuration. However, this mechanism is not sufficient to sustain the warming observed for the rest of the last and penultimate glacial periods. We propose that the change in the Atlantic meridional overturning circulation (AMOC), as described in the literature, from a 'warm' to a 'cold mode' for MIS 2 and MIS 6 is responsible for the accumulation of warm waters in the subtropical western South Atlantic, preventing SST minima during the last and penultimate glacial maxima in the region. Change in benthic d13C corroborates that a fundamental modification in the AMOC mode might have triggered the heat accumulation. Our data also show a sudden increase in SST and surface salinity during the last glacial descent (MIS 4), indicating that the western portion of the subtropical gyres may have acted as a heat and salt reservoir, while higher latitude climates transited to a glacial background. Our findings imply that the AMOC 'cold mode' induces heat storage in the subtropical western South Atlantic and, because of that, the last two regional SST minima occurred out-of-phase with the glacial maxima of higher latitudes.
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 6
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    PANGAEA
    In:  Supplement to: Burckel, Pierre; Waelbroeck, Claire; Luo, Yiming; Roche, Didier M; Pichat, Sylvain; Jaccard, Samuel L; Gherardi, Jeanne-Marie; Govin, Aline; Lippold, Jörg; Thil, François (2016): Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka). Climate of the Past, 12(11), 2061-2075, https://doi.org/10.5194/cp-12-2061-2016
    Publication Date: 2023-01-13
    Description: We reconstruct the geometry and strength of the Atlantic Meridional Overturning Circulation during Heinrich Stadial 2 and three Greenland interstadials of the 20-50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500 m depth, with a flow rate lower than that of the present day North Atlantic Deep Water (NADW). Southern-sourced deep waters most probably flowed northwards below 4000 m depth into the North Atlantic basin, and then southwards as a return flow between 2500 and 4000 m depth. The flow rate of this southern-sourced deep water was likely larger than that of the modern Antarctic Bottom Water (AABW). Our results further show that during Heinrich Stadial 2, the deep Atlantic was probably directly affected by a southern-sourced water mass below 2500 m depth, while a slow southward flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500 m down to the equator.
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 7
    Publication Date: 2023-01-13
    Keywords: AGE; GL1248; GL-1248; Quantile (Q0.025); Quantile (Q0.16); Quantile (Q0.84); Quantile (Q0.975); Δδ18O
    Type: Dataset
    Format: text/tab-separated-values, 1895 data points
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  • 8
    Publication Date: 2023-02-07
    Keywords: AGE; Age, error; DEPTH, sediment/rock; Estimated; GL1090; GL-1090; Reference/source; Tie point; western South Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 38 data points
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  • 9
    Publication Date: 2023-02-07
    Keywords: Age, 14C AMS; Age, 14C calibrated, CALIB 7.0 with MARINE13 calibration curve (Reimer et al. 2013); Age, dated; Age, dated, range, maximum; Age, dated, range, minimum; Age, dated standard error; DEPTH, sediment/rock; GL1090; GL-1090; Laboratory code/label; western South Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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  • 10
    Publication Date: 2023-02-08
    Keywords: AGE; DEPTH, sediment/rock; GL1248; GL-1248; Titanium/Calcium ratio
    Type: Dataset
    Format: text/tab-separated-values, 3233 data points
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