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  • 1
    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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  • 2
    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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  • 3
    Publication Date: 2020-02-06
    Description: Two interglacial epochs are included in the suite of Paleoclimate Modeling Intercomparison Project (PMIP4) simulations in the Coupled Model Intercomparison Project (CMIP6). The experimental protocols for simulations of the mid-Holocene (midHolocene, 6000 years before present) and the Last Interglacial (lig127k, 127 000 years before present) are described here. These equilibrium simulations are designed to examine the impact of changes in orbital forcing at times when atmospheric greenhouse gas levels were similar to those of the preindustrial period and the continental configurations were almost identical to modern ones. These simulations test our understanding of the interplay between radiative forcing and atmospheric circulation, and the connections among large-scale and regional climate changes giving rise to phenomena such as land–sea contrast and high-latitude amplification in temperature changes, and responses of the monsoons, as compared to today. They also provide an opportunity, through carefully designed additional sensitivity experiments, to quantify the strength of atmosphere, ocean, cryosphere, and land-surface feedbacks. Sensitivity experiments are proposed to investigate the role of freshwater forcing in triggering abrupt climate changes within interglacial epochs. These feedback experiments naturally lead to a focus on climate evolution during interglacial periods, which will be examined through transient experiments. Analyses of the sensitivity simulations will also focus on interactions between extratropical and tropical circulation, and the relationship between changes in mean climate state and climate variability on annual to multi-decadal timescales. The comparative abundance of paleoenvironmental data and of quantitative climate reconstructions for the Holocene and Last Interglacial make these two epochs ideal candidates for systematic evaluation of model performance, and such comparisons will shed new light on the importance of external feedbacks (e.g., vegetation, dust) and the ability of state-of-the-art models to simulate climate changes realistically.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
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  • 4
    Publication Date: 2024-02-07
    Description: We present a global atlas of downcore foraminiferal oxygen and carbon isotope ratios available at https://doi.org/10.1594/PANGAEA.936747 (Mulitza et al., 2021a). The database contains 2106 published and previously unpublished stable isotope downcore records with 361 949 stable isotope values of various planktic and benthic species of Foraminifera from 1265 sediment cores. Age constraints are provided by 6153 uncalibrated radiocarbon ages from 598 (47 %) of the cores. Each stable isotope and radiocarbon series is provided in a separate netCDF file containing fundamental metadata as attributes. The data set can be managed and explored with the free software tool PaleoDataView. The atlas will provide important data for paleoceanographic analyses and compilations, site surveys, or for teaching marine stratigraphy. The database can be updated with new records as they are generated, providing a live ongoing resource into the future.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 5
    Publication Date: 2023-08-01
    Description: Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18–15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5–1.5 °C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes.
    Type: Article , PeerReviewed
    Format: text
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  • 6
    Publication Date: 2021-01-05
    Description: Few palaeoclimate archives beyond the polar regions preserve continuous and datable palaeotemperature proxy time series over multiple glacial-interglacial cycles. This hampers efforts to develop a more coherent picture of global patterns of past temperatures. Here we show that Mg concentrations in a subaqueous speleothem from an Italian cave track regional sea-surface temperatures over the last 350,000 years. The Mg shows higher values during warm climate intervals and converse patterns during cold climate stages. In contrast to previous studies, this implicates temperature, not rainfall, as the principal driver of Mg variability. The depositional setting of the speleothem gives rise to Mg partition coefficients that are more temperature dependent than other calcites, enabling the effect of temperature change on Mg partitioning to greatly exceed the effects of changes in source-water Mg/Ca. Subaqueous speleothems from similar deep-cave environments should be capable of providing palaeotemperature information over multiple glacial-interglacial cycles.
    Description: Published
    Description: 5027
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Keywords: speleothem ; palaeotemperature ; magnesium ; Magnesium in subaqueous speleothems as a potential palaeotemperature proxy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
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    Elsevier
    In:  EPIC3Earth and Planetary Science Letters, Elsevier, 398, pp. 1-10, ISSN: 0012-821X
    Publication Date: 2014-06-27
    Description: The past climate evolution of southwestern Africa is poorly understood and interpretations of past hydrological changes are sometimes 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 δD and δ13C 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 δD and higher δ13C (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.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 8
    Publication Date: 2021-07-01
    Description: The modeling of paleoclimate, using physically based tools, is increasingly seen as a strong out-of-sample test of the models that are used for the projection of future climate changes. New to the Coupled Model Intercomparison Project (CMIP6) is the Tier 1 Last Interglacial experiment for 127 000 years ago (lig127k), designed to address the climate responses to stronger orbital forcing than the midHolocene experiment, using the same state-of-the-art models as for the future and following a common experimental protocol. Here we present a first analysis of a multi-model ensemble of 17 climate models, all of which have completed the CMIP6 DECK (Diagnostic, Evaluation and Characterization of Klima) experiments. The equilibrium climate sensitivity (ECS) of these models varies from 1.8 to 5.6 ∘C. The seasonal character of the insolation anomalies results in strong summer warming over the Northern Hemisphere continents in the lig127k ensemble as compared to the CMIP6 piControl and much-reduced minimum sea ice in the Arctic. The multi-model results indicate enhanced summer monsoonal precipitation in the Northern Hemisphere and reductions in the Southern Hemisphere. These responses are greater in the lig127k than the CMIP6 midHolocene simulations as expected from the larger insolation anomalies at 127 than 6 ka. New synthesis for surface temperature and precipitation, targeted for 127 ka, have been developed for comparison to the multi-model ensemble. The lig127k model ensemble and data reconstructions are in good agreement for summer temperature anomalies over Canada, Scandinavia, and the North Atlantic and for precipitation over the Northern Hemisphere continents. The model–data comparisons and mismatches point to further study of the sensitivity of the simulations to uncertainties in the boundary conditions and of the uncertainties and sparse coverage in current proxy reconstructions. The CMIP6–Paleoclimate Modeling Intercomparison Project (PMIP4) lig127k simulations, in combination with the proxy record, improve our confidence in future projections of monsoons, surface temperature, and Arctic sea ice, thus providing a key target for model evaluation and optimization.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
    Publication Date: 2017-01-27
    Description: Abundant hydroclimatic evidence from western Amazonia and the adjacent Andes documents wet conditions during Heinrich Stadial 1 (HS1, 18–15 ka), a cold period in the high latitudes of the North Atlantic. This precipitation anomaly was attributed to a strengthening of the South American summer monsoon due to a change in the Atlantic interhemispheric sea surface temperature (SST) gradient. However, the physical viability of this mechanism has never been rigorously tested. We address this issue by combining a thorough compilation of tropical South American paleorecords and a set of atmosphere model sensitivity experiments. Our results show that the Atlantic SST variations alone, although leading to dry conditions in northern South America and wet conditions in northeastern Brazil, cannot produce increased precipitation over western Amazonia and the adjacent Andes during HS1. Instead, an eastern equatorial Pacific SST increase (i.e., 0.5–1.5 °C), in response to the slowdown of the Atlantic Meridional Overturning Circulation during HS1, is crucial to generate the wet conditions in these regions. The mechanism works via anomalous low sea level pressure over the eastern equatorial Pacific, which promotes a regional easterly low-level wind anomaly and moisture recycling from central Amazonia towards the Andes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
    Publication Date: 2016-06-23
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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