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  • AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI  (4)
  • Electronic books.  (3)
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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Paleoclimatology--Holocene. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (494 pages)
    Edition: 1st ed.
    ISBN: 9783662103135
    Series Statement: GKSS School of Environmental Research Series
    DDC: 551.6/09/01
    Language: English
    Note: GKSS School of Environmental Research -- The Climate in Historical Times -- Copyright -- Preface -- Contents -- List of Contributors -- 1 The Holocene: Considerations with Regard to its Climate and Climate Archives -- 2 Nonlinear Dynamics of the Climate System -- 3 A Discourse About Quasi-realistic Climate Models and Their Applications in Paleoclimatic Studies -- 4 Holocene Climate Variability from Model Simulations - State of the Art -- 5 Marine Paleoclimatology - Motivation, Tools, and Results -- 6 Corals as Climate Archive -- 7 Annually Laminated Lake Sediments and Their Palaeoclimatic Relevance -- 8 Interpreting Climate Proxies from Tree-rings -- 9 The Environmental and Climate Record in Polar Ice Cores -- 10 Reconstructing Large-scale Variability from Palaeoclimatic Evidence by Means of Data Assimilation Through Upscaling and Nudging (DATUN) -- 11 Mid- to Late Holocene Lake Ecosystem Response to Catchment and Climatic Changes- A Detailed Varve Analysis of Lake Holzmaar(Germany) -- 12 Holocene Palaeoclimate in the Saharo-ArabianDesert -- 13 Transfer Functions for PaleoclimateReconstructions - Theory and Methods -- 14 Transfer Functions for Paleoclimate Reconstructions - Applications -- 15 Climate Information from Stable Hydrogenand Carbon Isotopes of C3 Plants - GrowthChamber Experiments and Field Observations -- 16 Detection of Climate Modes as Recorded in a Seasonal-resolution Coral Record Covering the Last 250 Years -- 17 Phase Stability of the Solar Schwabe Cycle in Lake Holzmaar, Germany, and G ISP2, Greenland, between 10,000 and 9,000 cal. BP -- 18 Variable Freshwater Input to the Arctic Ocean During the Holocene: Implications for Large-Scale Ocean-Sea Ice Dynamics as Simulated by a Circulation Model -- 19 Forced Climate Variability During the Last Millennium with the Earth System Model CLIMBER-2. , 20 The Contribution of High-resolution Magnetostratigraphic Analyses to Paleoclimatic Reconstructions -- 21 Internal Climate Variability in Global and Regional Climate Models -- 22 Climate Diagnostics by Adjoint Modelling: A Feasibility Study -- 23 Evidence for the Climate During the Late Maunder Minimum from Proxy Data and Model Simulations Available Within KIHZ -- References -- Index.
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  • 2
    Keywords: Earth sciences. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (242 pages)
    Edition: 1st ed.
    ISBN: 9783319138657
    Series Statement: Springer Earth System Sciences Series
    DDC: 363.73874
    Language: English
    Note: Intro -- Acknowledgments -- Contents -- Part I Introduction -- 1 Earth System Science---Past Experiences and Future Trends -- Abstract -- 1 Introduction -- 2 Review -- 3 Future Trends -- 4 Conclusion -- References -- 2 The Educational Program of the Earth System Science Research School (ESSReS) -- Abstract -- 1 Introduction -- 2 The Educational Program -- 2.1 Introductory Courses -- 2.2 Expert Courses -- 2.3 Seminar Series -- 2.4 Computational Skills Courses -- 2.5 Transferable Skill Courses -- 2.6 Academic Writing Courses -- 2.7 Excursions -- 2.8 Annual Retreat -- 3 International Exchange -- 3.1 International and National Meetings -- 3.2 Visit in a Foreign Lab -- 3.3 Invited Guest Scientists -- 4 Progress Assessments -- 5 Conclusions -- References -- 3 Time Evolution of a PhD Student's Mood---A Review of My Time as PhD Student of the Research School ESSReS -- 1 Introduction -- 2 Time Evolution of a PhD Students's Mood -- 3 Conclusion -- References -- 4 Progress in Earth System Science: What Does It Take to Make Our Ideas Clear? -- Abstract -- 1 Self-critical Approach -- 2 Hypothesis Testing and Models -- 3 Building of Models and Expressing the Scientific Discoveries -- References -- Part II Remote Sensing and Modelling of Atmospheric Chemistry and Sea Ice Parameters -- 5 Towards a Better Tropospheric Ozone Data Product from SCIAMACHY: Improvements in High Latitude Stratospheric Ozone -- Abstract -- 1 Introduction -- 2 Limb Measurements and Comparison Methodology -- 3 SCIAMACHY Limb Retrieval of Version 2.9 -- 4 SCIAMACHY Limb Retrieval of Version 3.0 and Comparison Results -- 5 Conclusions -- Acknowledgments -- References -- 6 Ten-Year SCIAMACHY Stratospheric Aerosol Data Record: Signature of the Secondary Meridional Circulation Associated with the Quasi-Biennial Oscillation -- Abstract -- 1 Introduction -- 2 Instrument and Data. , 3 Results and Discussion -- 4 Conclusions -- Acknowledgments -- References -- 7 Investigating the Link Between Glyoxal and Biogenic Activities -- Abstract -- 1 Introduction -- 2 Glyoxal Retrieval -- 3 Results and Discussion -- 4 Conclusions -- Acknowledgments -- References -- 8 Estimates of NOx Emission Factors from GOME-2 Measurements for the Major Types of Open Biomass Burning -- Abstract -- 1 Introduction -- 2 Data and Methods -- 2.1 Satellite Measurements of TVC NO2 -- 2.2 Satellite Measurements of FRP -- 2.3 Land Cover Type Product -- 2.4 Production Rate of NOx from Fire -- 2.5 Estimation of NOx Emission Factors -- 3 Results and Discussion -- 4 Conclusions and Outlook -- References -- 9 The Use of FTIR-Spectrometry in Combination with Different Biosphere-Atmosphere Flux Measurement Techniques -- Abstract -- 1 Introduction -- 2 Experimental Setup -- 2.1 The Flux Gradient Technique -- 2.2 The Flux Chamber Technique -- 3 Flux Gradient- and Flux Chamber Measurements -- 4 Discussion and Conclusion -- Acknowledgments -- References -- 10 Near-Infrared Lunar Absorption Spectroscopy for the Retrieval of Column Averaged CO2 and CH4 -- Abstract -- 1 Introduction -- 2 Ground-Based Column Averaged Trace Gas Retrieval -- 3 Spectra from the Bremen Instrument Setup -- 4 xCO2 and xCH4 from Lunar Absorption Spectroscopy -- 5 Conclusions -- Acknowledgements -- References -- 11 A New Method to Filter Out Radio-Frequency Interference (RFI) from SMOS Level 1C Data for Sea Ice Applications -- Abstract -- 1 Introduction -- 2 Data Description -- 3 Filtering Procedure -- 4 Conclusion -- Acknowledgments -- References -- 12 Arctic Multiyear Ice Concentration Retrieval from SSM/I Data Using the NASA Team Algorithm with Dynamic Tie Points -- Abstract -- 1 Introduction -- 2 Method -- 3 Time Series Results -- 4 Sensitivity Study and Conclusion -- Acknowledgements -- References. , 13 Detecting CDOM Fluorescence Using High Spectrally Resolved Satellite Data: A Model Study -- Abstract -- 1 Introduction -- 2 Methods -- 2.1 DOAS Retrieval Technique -- 2.2 CDOM Fluorescence Modeling -- 2.2.1 CDOM as Mixture of Humic and Fulvic Acids -- 2.2.2 Excitation-Emission Matrices Approach -- 3 Results and Discussion -- 4 Conclusions and Outlook -- Acknowledgments -- References -- Part III Physical Oceanography -- 14 The Flow of Dense Water Plumes in the Western Weddell Sea Simulated with the Finite Element Ocean Model (FEOM) -- Abstract -- 1 Introduction -- 2 Model Setup and Experiments -- 3 Results -- 4 Summary and Conclusions -- Acknowledgments -- References -- 15 Data Analysis and Modeling of the Amundsen Sea Embayment -- Abstract -- 1 Introduction -- 2 Hydrographic Data Analysis -- 3 Modeling of the Amundsen Sea -- 4 Discussion and Outlook -- References -- Part IV Sea-ice Physics -- 16 Impact of Sea-Ice Bottom Topography on the Ekman Pumping -- Abstract -- 1 Introduction -- 2 Data and Methods -- 3 Calculation of Oceanic Drag Coefficients -- 4 Ekman Pumping -- 5 Summary and Conclusion -- Acknowledgments -- References -- 17 Classification of CryoSat-2 Radar Echoes -- Abstract -- 1 Introduction -- 2 Methods -- 3 Results -- 4 Discussion -- 5 Conclusion -- Acknowledgments -- References -- Part V Earth System Modelling and Data Analysis -- 18 Integration of Passive Tracers in a Three-Dimensional Ice Sheet Model -- Abstract -- 1 Introduction -- 2 Methods -- 2.1 Present Day Control Run -- 2.2 Passive Tracer Advection -- 2.2.1 Validation of Tracer Modules -- 2.2.2 Analytical Comparison to the Nye-Vialov Solution -- 3 Discussion -- References -- Part VI Climate Archives and Geotectonics -- 19 Bivalve Shells---Unique High-Resolution Archives of the Environmental Past -- Abstract -- 1 Introduction -- 2 Methods -- 2.1 Shell Origin and Laboratory Work. , 2.2 State of Preservation -- 2.3 Frequency Analysis -- 2.4 Stable Oxygen Isotopes ( delta 18O) -- 3 Results -- 3.1 State of Preservation -- 3.2 Frequency Analysis -- 3.3 Stable Oxygen Isotopes ( delta 18O) -- 4 Discussion and Conclusions -- Acknowledgments -- References -- 20 Functional Diversity and Traits Assembly Patterns of Benthic Macrofaunal Communities in the Southern North Sea -- Abstract -- 1 Introduction -- 2 Material and Methods -- 3 Results -- 4 Discussion -- Acknowledgments -- 21 Snow Accumulation in North Greenland over the Last Millennium -- Abstract -- 1 Introduction -- 2 Methods -- 3 Results -- 4 Discussion and Conclusion -- References -- 22 Seismostratigraphic Analysis and Glacial History of the Weddell Sea Region, Antarctica -- Abstract -- 1 Introduction -- 2 Data and Methods -- 3 Results -- 3.1 Seismic Characteristics and Horizon Stratigraphy -- 3.2 Sedimentation Rates -- 4 Discussion and Conclusions -- Acknowledgments -- References -- Part VII Geoinformatics -- 23 Visual Analysis of Relevant Fields in Geoscientific Multifield Data -- Abstract -- 1 Introduction -- 2 Related Work -- 3 Field Similarity Plot -- 4 Interactive Visual Analysis -- 5 Use Cases -- 5.1 Multifield -- 5.2 Time-Varying Field -- 6 Discussion -- 7 Conclusion -- Acknowledgements -- References -- 24 A Database Language More Suitable for the Earth System Sciences -- Abstract -- 1 Introduction -- 2 Data Model -- 3 Query Language -- 3.1 Array Construction -- 3.2 Array Inspection Operators -- 3.3 Array Aggregation -- 3.4 Derived Operators -- 3.5 Array \leftrightarrow Table Conversion -- 3.6 Array \leftrightarrow LOB Conversion -- 4 Implementation -- 5 Conclusion -- Acknowledgments -- References -- 25 Towards Collaborative Exploration and Analysis of Big Data from Mars: A Noachis Terra Case Study -- Abstract -- 1 Introduction -- 2 Data and Methods. , 3 Noachis Terra Case Study -- 4 Discussion -- 5 Conclusions -- Acknowledgments -- References.
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  • 3
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Earth sciences. ; Geology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (141 pages)
    Edition: 1st ed.
    ISBN: 9783642322358
    Series Statement: SpringerBriefs in Earth System Sciences Series
    Language: English
    Note: Intro -- Earth System Science: Bridging the Gaps between Disciplines -- Preface -- Acknowledgments -- Contents -- 1 Introduction -- 1.1…General Aspects of Earth System Science -- 1.2…The Structural and Educational Concept in an Interdisciplinary Research School for Earth System Science -- 1.2.1 The Supervision and Mentoring Concept -- 1.2.2 The Managing Concept -- 1.2.3 The Helmholtz Certificate -- 2 Remote Sensing and Modelling of Atmospheric Chemistry and Sea Ice Parameters -- 2.1…NO2 Pollution Trends Over Megacities 1996--2010 from Combined Multiple Satellite Data Sets -- 2.1.1 Introduction -- 2.1.2 Method -- 2.1.3 Results -- 2.1.4 Discussion and Conclusion -- 2.2…A Brief Example on the Application of Remotely Sensed Tracer Observations in Atmospheric Science---Studying the Impact of Stratosphere--Mesosphere Coupling on Polar Ozone Variability -- 2.2.1 Introduction -- 2.2.2 CO as Tracer in the Polar Stratosphere and Mesosphere -- 2.2.3 Measurements of CO by Microwave Radiometry -- 2.2.4 Interpretation of the KIMRA CO Time Series -- 2.2.5 Summary and Conclusion -- 2.3…Contamination of the Western Pacific Atmosphere -- 2.3.1 Introduction -- 2.3.2 Method -- 2.3.3 Results -- 2.3.4 Discussion and Conclusion -- 2.4…Three Dimensional Model Simulations of the Impact of Solar Proton Events on Nitrogen Compounds and Ozone in the Middle Atmosphere -- 2.4.1 Introduction -- 2.4.2 Model SimulationsModel Simulations -- 2.4.2.1 The B3dCTM -- 2.4.2.2 Model Simulations of SPEs -- 2.4.3 Model Simulation Results -- 2.4.4 Summary and Discussion -- 2.5…Evaluation of the Coupled and Extended SCIATRAN Version Including Radiation Processes Within the Water: Initial Results -- 2.6…Improving the PhytoDOAS Method to Retrieve Coccolithophores Using Hyper-Spectral Satellite Data -- 2.6.1 Introduction -- 2.6.1.1 Motivation -- 2.6.1.2 The Importance of Coccolithophores. , 2.6.1.3 Objectives -- 2.6.2 Material and Method -- 2.6.2.1 From DOAS to PhytoDOAS -- 2.6.2.2 Improvement to PhytoDOAS -- 2.6.2.3 Satellite and Modeled Data -- 2.6.3 Results and Discussion -- 2.6.3.1 Global Distribution of Coccolithophores -- 2.6.3.2 Time Series of Monitored Parameters in a Selected Region of the North Atlantic -- 2.6.4 Conclusions and Outlook -- 2.7…Primary Productivity and Circulation Patterns Downstream of South Georgia: A Southern Ocean Example of the ''Island Mass Effect'' -- 2.7.1 Introduction -- 2.7.2 Data and Methods -- 2.7.3 Results and Discussion -- 2.7.4 Conclusions -- 2.8…Summer Sea Ice Concentration Changes in the Weddell Sea and Their Causes -- 2.8.1 Introduction -- 2.8.2 Data -- 2.8.3 Results and Discussion -- 2.8.4 Conclusion -- 2.9…Validation of the Snow Grain Size Retrieval SGSP Using Six Ground Truth Data Sets -- 2.9.1 Introduction -- 2.9.2 The SGSP Retrieval -- 2.9.3 Validation Studies -- 2.9.4 Discussion and Conclusion -- References -- 3 Earth System Modelling and Data Analysis -- 3.1…The Last Interglacial as Simulated by an Atmosphere--Ocean General Circulation Model: Sensitivity Studies on the Influence of the Greenland Ice Sheet -- 3.1.1 Introduction -- 3.1.2 Model Description and Experimental Setup -- 3.1.2.1 Model Description -- 3.1.2.2 Experimental Setup -- 3.1.3 Results -- 3.1.4 Discussion and Conclusions -- 3.2…Simulated Caribbean Climate Variability During the Mid-Holocene -- 3.2.1 Introduction -- 3.2.2 Method -- 3.2.2.1 Model Description -- 3.2.2.2 Experiment Setup -- 3.2.3 Results -- 3.2.3.1 Mean Climatology -- 3.2.3.2 Climate Variability Associated with the ENSO -- 3.2.3.3 Climate Variability Associated with the AMO -- 3.2.4 Discussion and Conclusion -- 3.3…Oceanic delta 18O Variation and its Relation to Salinity in the MPI-OM Ocean Model -- 3.3.1 Introduction -- 3.3.2 Method -- 3.3.2.1 Ocean Model. , 3.3.2.2 Isotope Tracer H218O -- 3.3.2.3 Observation Database of delta 18O -- 3.3.3 Results -- 3.3.4 Discussion and Conclusion -- 3.4…Ocean Adjustment to High-Latitude Density Perturbations -- 3.4.1 Introduction -- 3.4.2 Model Set-up -- 3.4.3 Results -- 3.4.4 Discussion and Conclusion -- References -- 4 Geotectonics -- 4.1…Continental Deformation of Antarctica During Gondwana's Breakup -- 4.1.1 Introduction -- 4.1.2 Method and Data -- 4.1.3 Results -- 4.1.4 Discussion and Summary -- Acknowledgments -- References -- 5 Climate Archives -- 5.1…The Inorganic Carbon System in the Deep Southern Ocean and Glacial-Interglacial Atmospheric CO2 -- 5.1.1 Introduction -- 5.1.2 Objective/Study Area/Materials and Methods -- 5.1.3 Results/Discussion -- 5.1.4 Outlook -- 5.2…The Significance of the Long Lived ( greaterthan 400 Years) Bivalve Arctica Islandica as a High-Resolution Bioarchive -- 5.2.1 Introduction -- 5.2.2 Methods -- 5.2.2.1 Effect of Sample Preparation -- 5.2.2.2 Lead, Barium, and Manganese Measurements -- 5.2.3 Results and Discussion -- 5.2.3.1 Effect of Sample Preparation -- 5.2.3.2 Lead as a Pollution Tracer -- 5.2.3.3 Barium and Manganese as Indicators of Primary Production -- 5.2.4 Conclusion -- 5.3…Sub-Annual Resolution Measurements of Dust Concentration and Size in Different Time Slices of the NorthGRIP Ice Core -- 5.3.1 Introduction -- 5.3.2 Method -- 5.3.3 Results -- 5.3.4 Discussion and Conclusion -- Acknowledgments -- References -- 6 Ecosystems and Climate Change -- 6.1…Predicting Habitat Suitability for Cold-Water Coral Lophelia pertusa Using Multiscale Terrain Variables -- 6.1.1 Introduction -- 6.1.2 Materials and Method -- 6.1.2.1 Study Area -- 6.1.2.2 Multiscale Terrain Variables -- 6.1.2.3 Predictive Method: Maxent -- 6.1.3 Results -- 6.1.4 Discussion and Conclusion -- References -- 7 Geoinformatics. , 7.1…Resource-Aware Decomposition and Orchestration of Geoprocessing Requests in a SOA Framework -- 7.1.1 Introduction -- 7.1.2 Query Decomposition and Orchestration -- 7.1.3 Performance Evaluation -- 7.1.4 Conclusion -- 7.2…A Specification-Based Quality Model to Improve Confidence in Web Services of Multidisciplinary Earth System Science -- 7.2.1 Introduction -- 7.2.2 Methods -- 7.2.3 Results -- 7.2.4 Discussion and Conclusion -- References -- 8 Geoengineering -- 8.1…Feasibility Study of Using a Petroleum Systems Modeling Software to Evaluate Basin Scale Pressure Evolution Associated With CO2 Storage -- 8.1.1 Introduction -- 8.1.2 Principles of Petroleum Systems Modelling -- 8.1.3 CO2 Injection Method in PetroMod -- 8.1.4 Evaluation of the Pressure Buildup in PetroMod -- 8.1.4.1 Method -- 8.1.4.2 Results -- 8.1.5 Discussion and Conclusion -- Acknowledgments -- References.
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  • 4
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    PANGAEA
    In:  Supplement to: Stein, Ruediger; Fahl, Kirsten; Gierz, Paul; Niessen, Frank; Lohmann, Gerrit (2017): Arctic Ocean sea ice cover during the penultimate glacial and the last interglacial. Nature Communications, 8(1), 13 pp, https://doi.org/10.1038/s41467-017-00552-1
    Publication Date: 2023-03-16
    Description: Coinciding with global warming, Arctic sea ice has rapidly decreased during the last four decades and climate scenarios suggest that sea ice may completely disappear during summer within the next about 50-100 years. Here we produce Arctic sea ice biomarker proxy records for the penultimate glacial (Marine Isotope Stage 6) and the subsequent last interglacial (Marine Isotope Stage 5e). The latter is a time interval when the high latitudes were significantly warmer than today. We document that even under such warmer climate conditions, sea ice existed in the central Arctic Ocean during summer, whereas sea ice was significantly reduced along the Barents Sea continental margin influenced by Atlantic Water inflow. Our proxy reconstruction of the last interglacial sea ice cover is supported by climate simulations, although some proxy data/model inconsistencies still exist. During late Marine Isotope Stage 6, polynya-type conditions occurred off the major ice sheets along the northern Barents and East Siberian continental margins, contradicting a giant Marine Isotope Stage 6 ice shelf that covered the entire Arctic Ocean.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 5
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    PANGAEA
    In:  Supplement to: Abelmann, Andrea; Gersonde, Rainer; Knorr, Gregor; Zhang, Xu; Chapligin, Bernhard; Maier, Edith; Esper, Oliver; Friedrichsen, Hans; Lohmann, Gerrit; Meyer, Hanno; Tiedemann, Ralf (2015): The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink. Nature Communications, 6, 8136, https://doi.org/10.1038/ncomms9136
    Publication Date: 2023-03-30
    Description: Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 12 datasets
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  • 6
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    PANGAEA
    In:  Supplement to: Meyer, Vera D; Hefter, Jens; Lohmann, Gerrit; Max, Lars; Tiedemann, Ralf; Mollenhauer, Gesine (2017): Summer temperature evolution on the Kamchatka Peninsula, Russian Far East, during the past 20000 years. Climate of the Past, 13(4), 359-377, https://doi.org/10.5194/cp-13-359-2017
    Publication Date: 2023-03-16
    Description: Little is known about the climate evolution on the Kamchatka Peninsula during the last glacial?interglacial transition as existing climate records do not reach beyond 12 ka BP. In this study, a summer temperature record for the past 20 kyr is presented. Branched glycerol dialkyl glycerol tetraethers, terrigenous biomarkers suitable for continental air temperature reconstructions, were analyzed in a sediment core from the western continental margin off Kamchatka in the marginal northwest Pacific (NW Pacific). The record suggests that summer temperatures on Kamchatka during the Last Glacial Maximum (LGM) equaled modern temperatures. We suggest that strong southerly winds associated with a pronounced North Pacific High pressure system over the subarctic NW Pacific accounted for the warm conditions. A comparison with an Earth system model reveals discrepancies between model and proxy-based reconstructions for the LGM temperature and atmospheric circulation in the NW Pacific realm. The deglacial temperature development is characterized by abrupt millennial-scale temperature oscillations. The Bølling?Allerød warm phase and the Younger Dryas cold spell are pronounced events, suggesting a connection to North Atlantic climate variability.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    PANGAEA
    In:  Supplement to: Kühn, Hartmut; Lembke-Jene, Lester; Lohmann, Gerrit; Gersonde, Rainer; Esper, Oliver; Arz, Helge Wolfgang; Kuhn, Gerhard; Tiedemann, Ralf (submitted): Tidal forcing and ocean-atmosphere dynamics influence on productivity variations in the deglacial Bering Sea. Geophysical Research Letters
    Publication Date: 2024-02-16
    Description: During the last glacial termination, the upper North Pacific Ocean underwent dramatic and rapid changes in oxygenation that lead to the transient intensification of oxygen minimum zones (OMZs), recorded by the widespread occurrence of laminated sediments on circum-Pacific continental margins. We present a new laminated sediment record from the mid-depth (1100 m) northern Bering Sea margin that provides insight into these deglacial OMZ maxima with exceptional, decadal-scale detail. Combined ultrahigh-resolution micro-X-ray-fluorescence (micro-XRF) data and sediment facies analysis of laminae reveal an alternation between predominantly terrigenous and diatom-dominated opal sedimentation. The diatomaceous laminae are interpreted to represent spring/summer productivity events related to the retreating sea ice margin.We identified five laminated sections in the deglacial part of our site. Lamina counts were carried out on these sections and correlated with the Bølling–Allerød and Preboreal phases in the North Greenland Ice Core (NGRIP) oxygen isotope record, indicating an annual deposition of individual lamina couplets (varves). The observed rapid decadal intensifications of anoxia, in particular within the Bølling–Allerød, are tightly coupled to short-term warm events through increases in regional export production. This dependence of laminae formation on warmer temperatures is underlined by a correlation with published Bering Sea sea surface temperature records and d18O data of planktic foraminifera from the Gulf of Alaska. The rapidity of the observed changes strongly implies a close atmospheric teleconnection between North Pacific and North Atlantic regions.We suggest that concomitant increases in export production and subsequent remineralization of organic matter in the Bering Sea, in combination with oxygen-poor waters entering the Being Sea, drove down oxygen concentrations to values below 0.1ml/l and caused laminae preservation. Calculated benthic–planktic ventilation ages show no significant variations throughout the last deglaciation, indicating that changes in formation rates or differing sources of North Pacific mid-depth waters are not prime candidates for strengthening the OMZ at our site. The age models established by our correlation procedure allow for the determination of calendar age control points for the Bølling–Allerød and the Preboreal that are independent of the initial radiocarbon-based chronology. Resulting surface reservoir ages range within 730–990 yr during the Bølling–Allerød, 800–1100 yr in the Younger Dryas, and 765–775 yr for the Preboreal.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 17 datasets
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