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  • 2015-2019  (174)
Keywords
Language
Year
  • 1
    Keywords: Report
    Type of Medium: Online Resource
    Pages: Online-Ressource (29 Seiten, 1,1 MB) , Diagramme
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 30
    Language: English
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  • 2
    Online Resource
    Online Resource
    London :Taylor & Francis Group,
    Keywords: Ecology. ; Ecology-Environmental aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (1085 pages)
    Edition: 1st ed.
    ISBN: 9781498796866
    DDC: 665.77
    Language: English
    Note: Cover -- Half Title -- Title Page -- Copyright Page -- Dedication -- Contents -- Preface -- Acknowledgments -- About the Authors -- Section I: Fundamentals of Manufactured Gas -- Chapter 1: Gas and Gasmaking in Massachusetts -- 1.1 Introduction and Objective -- 1.2 Navigating the Gas-Manufacturing Processes Employed in Massachusetts -- 1.2.1 Why Gas Process Identification Matters So Much in Remediation -- 1.3 Wood Gas (Also Known as Resin Gas, Rosin Gas, Fatwood Gas) -- 1.4 Coal Gas -- 1.4.1 Birth of Coal Gas -- 1.4.1.1 Pyrolysis -- 1.4.2 Coal Gas Retorts -- 1.4.2.1 Gas-Generation Working Conditions in General -- 1.4.2.2 Walter Russell's Enlightening Description (1917) -- 1.4.2.3 Later Developments in Coal Gas Operations -- 1.4.2.4 Case Example of a Modern Coal Gas Plant-Worcester, Circa 1910 -- 1.4.3 Vertical Retorts -- 1.5 Early Oil Gas in Massachusetts (1820-1890) -- 1.5.1 Characteristics of Early Oil Gas Works -- 1.5.2 Gas Oil Supply in Massachusetts -- 1.5.3 Petroleum Oil Gas in Massachusetts (1890-1929) -- 1.5.4 Naphtha Gas -- 1.5.5 L.P. Lowe Perfects the Crude Oil Gas Manufacturing Process, in Massachusetts (Lynn, 1887) -- 1.6 Water-Gas -- 1.6.1 Blue Water-Gas -- 1.6.1.1 Producer Gas -- 1.6.2 First Fuel Gas Distributed in the United States (Lynn, Massachusetts, 1883) -- 1.7 Carbureted Water-Gas (Lowe) -- 1.7.1 Rise and Utility of CWG -- 1.7.2 Practical Advantages of CWG -- 1.7.3 Disadvantages of CWG -- 1.7.4 Growth of CWG in Massachusetts -- 1.8 Oil-Enriched Water-Gas -- 1.9 Differentiation of Petroleum Oil Gas From Oil-Enriched Water-Gas -- 1.9.1 Greenough-Jones-Addicks Fuel Gas Patent (1890) -- 1.9.2 Loomis Producer Fuel Gas CWG and Blue Gas (1890) -- 1.9.3 Granger Oil-Enriched Water-Gas -- 1.9.4 Jerzmanowski Oil-Enriched Water-Gas -- 1.9.5 Wilkinson Oil-Enriched Water-Gas. , 1.9.6 Expiration (1894) of Lowe Patents and Decline of the Oil-Enriched Water-Gas Lowe Imitators -- 1.10 Later Water-Gas and Bituminous Coal Technologies -- 1.11 Small-Scale Gas Processes -- 1.11.1 Proprietary German High-BTU Oil Gas Processes -- 1.11.1.1 Pintsch Gas -- 1.11.1.2 Blau Gas -- 1.11.2 "Spirit" Gas (Also Known As Gasolene Gas -- Air Gas) -- 1.12 Late Nineteenth-Century Noncarbureted Fuel Gas -- 1.12.1 Greased Wind (Greased Air) -- 1.13 Combined-Process Gas Plants -- 1.14 By-Product Coke-Oven Gas -- 1.14.1 Transport Influences on By-Product Coke Ovens -- 1.14.2 New England Gas and Coke Company, Everett -- 1.14.2.1 General Nature of the Everett Coke-Oven Plant -- 1.14.3 Coke-Oven Gas and By-Products -- 1.15 1930s High-Btu Water-Gas and Second-Generation Oil Gas -- 1.16 Acetylene as an Illumination and Heating Gas -- 1.16.1 General Rural Nature of Acetylene Gas Plants -- 1.16.2 Acetylene Gas Plants of Rural Massachusetts -- 1.17 Late Period High-BTU Refinery Gas Reforming (1929-1955) -- 1.17.1 Butane/Propane-Air Gas (1929-1955) -- 1.17.2 Second-Generation Oil Gas -- 1.17.3 High-Btu Substitute Natural Gas Reforming (1947-1955) -- 1.18 Late-Period Innovative Gas Technologies -- 1.19 Key Findings -- End Notes -- Chapter 2: Other Aspects of Gas Engineering in Massachusetts -- 2.1 Introduction and Objective -- 2.2 Engineering the Gasworks -- 2.2.1 Art and the Imperative of Gasworks Site Selection and Layout -- 2.2.2 Basic Requirements of Gasworks Historic Site Selection -- 2.2.3 Transportation of Gasworks Feedstock -- 2.2.4 Geotechnical Considerations in Historic Gasworks Siting and Operations -- 2.2.4.1 Bedrock Conditions -- 2.2.5 Case Example of Amherst, Massachusetts -- 2.2.6 Case Example of Springfield, Massachusetts -- 2.3 Fall River Gas Works Company: An Example of Large Scale Capital Improvement. , 2.3.1 Carbureted Water-Gas in Full-Scale Use: The Fall River Gas Works Company -- 2.3.2 Fall River Gas Works Company's New 1915 Plant -- 2.4 Gas Treatment, Storage, and Distribution -- 2.4.1 Treatment of Raw Gas: Clarification -- then Purification -- 2.4.2 "Clarification" (Mainly Tar Removal) of Raw Gas -- 2.4.2.1 Condensers -- 2.4.2.2 Specific Clarification Technologies Related to Tar Removal -- 2.4.3 Capture and Removal of Ammonia -- 2.4.3.1 Ammonia Recovery -- 2.4.3.2 Historical Perspectives on Ammonia Challenges -- 2.4.3.3 Specific Clarification Technologies Related to Ammonia Concentration and Removal -- 2.4.4 Naphthalene Removal -- 2.5 Purification (Impurity-Removal) of Raw Gas -- 2.5.1 Purification by Absorption in Lime -- 2.5.2 Purification by Absorption in Wood Chips -- 2.5.3 Purification by Absorption in "Oxide" -- 2.6 Gashouse Wastes and their Fates -- 2.6.1 Differentiation of Residuals Versus By-Products and Wastes -- 2.6.2 Gas Liquors, Gas Tars, and Tar Light Oils -- 2.6.3 Wastewater Treatment at Gasworks -- 2.6.3.1 The Broader Role of Wastewater Treatment -- 2.6.3.2 Problems Arising from Gasworks Wastewater: The Lowell Example -- 2.6.3.3 Sizing a Treatment System -- 2.6.4 Waste Purification Media -- 2.6.4.1 Historic Fate of Spent Box Wastes in Massachusetts -- 2.7 Tar-Water Emulsions: The Curse of CWG -- 2.7.1 Gas Industry Begins to Face the Tar-Water Emulsion Problem -- 2.7.2 The Tar-Water Emulsion Problem is Defined (1923) -- 2.7.3 Isolating the CWG Tar-Water Emulsion Problem -- 2.7.4 Mitigating the CWG Tar-Water Emulsion Problem -- 2.7.4.1 The Semet-Solvay De-Emulsifier -- 2.8 Gas Holders as Encountered in Massachusetts -- 2.8.1 Design Features of Massachusetts Gasholders -- 2.8.2 Greenough Concept of Using Gasholders to Control Distribution Pressure -- 2.8.3 Holder Houses of Massachusetts -- 2.8.4 Waterless Gasholders. , 2.8.5 Operational Aspects of Massachusetts Gasholders -- 2.8.6 Gasholder Leaks and Explosions -- 2.8.6.1 Springfield Gas Light Company Explosion, 1908 -- 2.8.6.2 The Vineyard Lighting Company Explosion, 1921 -- 2.8.6.3 Late-Period Explosions and Fires -- 2.9 District (Distribution) Stations -- 2.9.1 Era of Gas District Stations of Massachusetts (1854-1970) -- 2.9.1.1 Basic Purpose and Configuration of District Stations -- 2.9.1.2 Case Example of the Washington Street District Station, Boston (1847-1867) -- 2.9.1.3 Case Example of the Gerard Street District Station No. 2, Dorchester/Roxbury (1875-1950) -- 2.9.1.4 Case Example of the Page Boulevard District Station, Springfield -- 2.9.1.5 Case Example of the Winchester District Station of Arlington Gas Light Co. (1894) -- 2.9.1.6 Case Example of the Suburban Gas & -- Electric Company -- 2.9.1.7 Case Example of "Gassy": Boston's Largest District Station (1914-1930) -- 2.9.1.8 Demise of the District Holder in Massachusetts -- 2.9.2 Relative Prospects of Encountering Hazardous Substances at Derelict Massachusetts District Station Sites -- 2.10 Gas Mains and Gas Distribution in Massachusetts -- 2.10.1 Rights-of-Way and Gas-Main Construction -- 2.10.2 Cost Considerations for Gas Mains -- 2.10.3 Pipe Joints and Testing of Completed Gas Mains -- 2.10.4 Electrolytic Corrosion of Gas Mains -- 2.10.5 Distribution Drips -- 2.10.5.1 Gas Distribution Pressure -- 2.10.5.2 Layout Considerations for Gas Mains -- 2.11 Nature of the Gas-Manufacturing Coal Supply in Massachusetts -- 2.11.1 Old King Coal -- 2.11.2 Bituminous "Gas Coal" -- 2.11.2.1 Anthracite Coal -- 2.11.3 Coal Importation at Boston -- 2.11.3.1 Canadian Maritime Provinces Coals -- 2.11.3.2 English Gas Coals at Boston -- 2.11.3.3 Arrival of Pennsylvania and West Virginia Gas Coals. , 2.11.3.4 Two of the Railroads Try to Squeeze Boston and Massachusetts Gas Makers -- 2.11.4 Impacts of Coal Mine Strikes -- 2.11.5 Shift from Anthracite to Bituminous Coal -- 2.11.6 Cannel Coal -- 2.11.7 "Peak Coal," Wartime Coal Shortages, and Alternative Materials -- 2.11.8 Coal Exigencies in Massachusetts during the Second World War -- 2.11.9 Transportation of Gasworks Coal Feedstock -- 2.11.10 The Oil Supply -- 2.12 Changes in Gasworks over Time -- 2.12.1 The Pittsfield, Massachusetts East Street Gasworks as an Example of Change Over Time -- 2.12.2 The Curious Use of Dual Gas/Electric Lighting Fixtures (1914c-1922c) -- 2.12.3 Today's Indulgences in Gas Lighting -- 2.13 Other Historic Gasworks Issues -- 2.13.1 Historic Technical Issues Influencing the FMGP Threat in Massachusetts -- 2.13.2 Economic Struggles for Control Over CWG Carbureting Oil -- 2.13.3 Historic Trade in Surplus Gas-Manufacturing Plant and Equipment -- 2.14 Key Findings of Chapter 2: In Consideration of Coal-Tar Site Remediation -- End Notes -- Chapter 3: Historic Gas Industry in Massachusetts -- 3.1 Introduction and Objective -- 3.2 Heyday of Manufactured Gas in Massachusetts (1828-1960) -- 3.3 "Town Gas," Municipal Gas Departments and Utility Merchant MGPs -- 3.3.1 The Gas Company as "Startup" -- 3.3.2 "Opposition" Companies -- 3.4 Nature of "Town Gas" Companies in Massachusetts -- 3.4.1 Relative Historical Statistics of Commercial Manufactured Gas Companies in Massachusetts -- 3.4.2 Period of 1827-1853 -- 3.4.3 Period of 1853-1880 -- 3.4.4 The 1880s-Water-Gas and the Board of Commissioners -- 3.4.5 Period of 1885-1920 -- 3.4.5.1 Blue Water-Gas Remains in Its Fuel Gas Niche -- 3.4.5.2 CWG Becomes the New Standard for Expansion -- 3.4.6 "City Gas" Utility Gas Plants of Massachusetts -- 3.4.7 Municipal Gas Ownership Movement in Massachusetts. , 3.5 Overall Historic Growth of the Massachusetts Gas Industry.
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  • 3
    Online Resource
    Online Resource
    Washington, DC :American Chemical Society,
    Keywords: Chemistry-Study and teaching (Higher)-United States. ; Community colleges-United States. ; Junior colleges-United States. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (220 pages)
    Edition: 1st ed.
    ISBN: 9780841232914
    Series Statement: ACS Symposium Series
    DDC: 540.71/173
    Language: English
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  • 4
    Online Resource
    Online Resource
    Chicago :University of Chicago Press,
    Keywords: Ecology-Methodology. ; Electronic books.
    Description / Table of Contents: No detailed description available for "Hierarchy".
    Type of Medium: Online Resource
    Pages: 1 online resource (424 pages)
    Edition: 1st ed.
    ISBN: 9780226489711
    DDC: 577
    Language: English
    Note: Intro -- Contents -- Introduction -- Part I . A Theory for Medium Number Systems -- Chapter 1. Hierarchies -- Chapter 2. The Janus-Faced Holon -- Chapter 3. Scales and Filters -- Chapter 4. Sirens of Certainty -- Part II. Origins of Life as a Complex Medium Number System -- Chapter 5. A Wrinkle in Time: Evolution by Preadaptation -- Chapter 6. Functional and Structural Boundaries -- Chapter 7. The Self-Replicating Hierarchy -- Chapter 8. Scaling Strategies -- Part III. Scale and Complex Systems -- Chapter 9. Identifying the Scale in Community Ecology -- Chapter 10. Hierarchy as a Context for Modeling and Simulation -- Chapter 11. Diversity and Connectedness -- Chapter 12. Scale as an Investigative Tool -- Acknowledgments -- Notes -- Glossary -- References -- Author Index -- Subject Index.
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  • 5
    Online Resource
    Online Resource
    San Rafael :Morgan & Claypool Publishers,
    Keywords: Lissajous' curves. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (76 pages)
    Edition: 1st ed.
    ISBN: 9781643270104
    Series Statement: IOP Concise Physics Series
    DDC: 781.2
    Language: English
    Note: Intro -- Preface -- Acknowledgments -- Author biography -- Thomas B Greenslade Jr -- Chapter 1 Preliminaries -- 1.1 Some mathematics -- 1.2 How Lissajous figures are formed -- Chapter 2 History -- 2.1 Nathaniel Bowditch and the Y-shaped pendulum -- 2.1.1 James Dean -- 2.1.2 Hugh Blackburn -- 2.2 Jules Lissajous and his tuning forks -- 2.2.1 Beats -- 2.3 Hubert Airy's harmonographs -- Chapter 3 Harmonographs of all sorts -- 3.1 Oscillating mirrors -- 3.2 The kaleidophone -- 3.3 Oscillating blades -- 3.4 Pendulum harmonographs -- 3.5 The Y-shaped pendulum -- 3.6 The two-speaker apparatus -- 3.7 Other harmonographs of unusual design -- 3.8 The oscilloscope -- 3.9 The animated harmonograph -- 3.10 Harmonograph 'toys' -- Chapter 4 Lovely Lissajous figures -- Blank Page.
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  • 6
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Eclipsing binaries -- Orbits. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (217 pages)
    Edition: 1st ed.
    ISBN: 9783319091983
    Series Statement: Astrophysics and Space Science Library ; v.408
    DDC: 523.844
    Language: English
    Note: Intro -- Foreword -- Acknowledgements -- Contents -- Contributing Authors -- 1 The ζ Aurigae Binaries -- 1.1 Introducing the ζ Aurigae Binaries -- 1.2 History and Background -- 1.3 Chromospheric Eclipses -- 1.4 The Field Widens -- 1.5 Other Advantages Offered by the ζ Aur Stars -- 1.6 Atmospheric Eclipses: Pioneers and Leaders -- 1.7 Atmospheric Eclipses: Opportunities and Challenges -- 1.8 Stellar Chromospheres: Updating Information -- References -- 2 Observing and Analyzing the ζ Aurigae Systems -- 2.1 Preamble -- 2.2 Spectroscopic Observations: Variety and Complementarity -- 2.2.1 Ground-Based Spectra: Historic (`Heritage') Data -- 2.2.2 The Switch to Digital Technology -- 2.2.3 Observations from Space -- 2.3 Analysis of a Chromosphere: Extracting Column Densities -- 2.4 Individual ζ Aur Systems -- 2.4.1 ζ Aur -- 2.4.1.1 Ground-Based Monitoring -- 2.4.1.2 UV Spectroscopy from Space -- 2.4.2 31 Cygni -- 2.4.2.1 Ground-Based Monitoring -- 2.4.2.2 UV Spectroscopy from Space -- 2.4.2.3 Quasi-periodic RV Variations -- 2.4.3 32 Cygni -- 2.4.3.1 Ground-Based Monitoring -- 2.4.3.2 UV Spectroscopy from Space -- 2.4.3.3 Quasi-periodic RV Variations -- 2.4.4 VV Cep -- 2.4.5 22 Vul -- 2.4.5.1 Ground-Based Monitoring -- 2.4.5.2 UV Spectroscopy from Space -- 2.4.6 HR 6902 -- 2.4.6.1 Ground-Based Monitoring -- 2.4.6.2 UV Spectroscopy from Space -- 2.4.7 HR 2554 -- 2.4.7.1 Ground-Based Monitoring -- 2.4.7.2 UV Spectroscopy from Space -- 2.4.8 τ Persei -- 2.4.8.1 Ground-Based Monitoring -- 2.4.8.2 UV Spectroscopy from Space -- 2.4.9 γ Persei -- 2.4.10 HD 223971 -- 2.4.11 ε Aur -- 2.5 Modelling Stellar Chromospheres -- 2.5.1 Densities in the Lower and Middle Chromosphere -- 2.5.2 The Upper Chromosphere and Wind -- 2.6 Comparisons and Contrasts -- 2.6.1 How Similar Are These Chromospheres to OneAnother? -- 2.6.2 How Different Are They?. , 2.7 The Inhomogeneity of the Chromosphere -- 2.8 Mass Loss and Stellar Winds -- 2.8.1 Properties of the Winds -- 2.8.2 Are the Wind and the Chromosphere a Single Structure or Two? -- 2.9 The ζ Aur Primaries as Templates for Single Stars -- 2.10 Looking Ahead -- Appendix: Digitizing Photographic Spectra -- References -- 3 The Special Case of VV Cephei -- 3.1 Introduction -- 3.2 Stellar and Orbit Solution -- 3.3 Optical and Ultraviolet Spectroscopy -- 3.4 The Formation of Spectrum Lines in VV Cep -- 3.5 Total Eclipse -- 3.6 Chromospheric Eclipse -- 3.7 Chromospheric Structure Inferred from Line Profiles -- 3.8 The Hot Companion -- 3.9 Comparison from Orbit to Orbit -- 3.10 VV Cep as an Extended Source -- 3.11 A Simple Wind Density Model -- 3.12 Looking Ahead -- References -- 4 ε Aurigae: A Two Century Long Dilemma Persists -- 4.1 Introduction -- 4.2 Selected Results of the 2010 Eclipse Campaigns -- 4.2.1 Orbital Solutions -- 4.2.2 Spectral Energy Distribution -- 4.2.3 Distance to the System -- 4.2.4 Light Curves -- 4.2.5 Spectroscopy -- 4.2.6 Additional Results, and New Work in Progress -- 4.2.7 Relative Component Masses: Models -- 4.3 Concordances with Other Binary Systems -- 4.4 Key Observational Opportunities -- References -- 5 Atmospheric Heating and Wind Acceleration in Cool Evolved Stars -- 5.1 Introduction -- 5.2 Observational Constraints to the Heating and Acceleration of Stellar Atmospheres and Winds -- 5.2.1 Energy Dissipation Requirements -- 5.2.2 Momentum Deposition Requirements -- 5.2.3 Constraints from Atmospheric Turbulence and Flows -- 5.3 Acoustic Heating: Successes and Limitations -- 5.3.1 Two-Component Chromosphere Models -- 5.3.2 Possible Relevance of Acoustic Waves to Winds from Cool Evolved Stars -- 5.4 MHD Wave-Heating and Wind Acceleration -- 5.4.1 Energy Dissipation Due to Alfvén Waves: A Source of Chromospheric Heating. , 5.4.2 Momentum Deposition by Alfvén Waves: Driving Winds from Cool Evolved Stars -- 5.5 Future Work: Toward Self-Consistent MHD Models of Stellar Atmospheres and Winds -- References -- 6 Optical Interferometry of Giants and Supergiants -- 6.1 Diameters and Astrometry of Single and Binary Supergiants -- 6.2 Miras and AGB Stars -- 6.3 Carbon Stars -- 6.3.1 Effective Temperature Versus (V0-K0) -- 6.3.2 Asphericity -- 6.4 Supergiants -- 6.5 To the Future! -- References -- 7 Asteroseismology of Eclipsing Binary Stars -- 7.1 Introduction -- 7.2 Principles of Asteroseismology -- 7.2.1 Types of Pulsation Modes -- 7.2.2 Excitation Mechanisms -- 7.2.2.1 Stochastic Oscillations -- 7.2.2.2 Coherent Pulsations -- 7.3 The Importance of Eclipsing Binary Stars for Asteroseismology -- 7.3.1 Asteroseismic Scaling Relations -- 7.3.2 Mode Identification and Driving Mechanisms in Intermediate-Mass Stars -- 7.3.3 Tidally Induced Pulsations and Eccentric Binary Systems -- 7.4 Giant Stars -- 7.4.1 Oscillating Giants in Eclipsing Binary Systems -- 7.4.2 Oscillating Giants in Eccentric Binary Systems -- 7.4.3 Giants in Hierarchical Triple Systems: The Case of HD 181068 -- 7.5 Dwarf and Subgiant Stars -- 7.5.1 Classical Pulsators -- 7.5.2 Compact Pulsators -- 7.6 Summary and Future Prospects -- References -- Afterword -- Index of Keywords.
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  • 7
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    PANGAEA
    In:  Supplement to: Lang, David C; Bailey, Ian; Wilson, Paul A; Chalk, Thomas B; Foster, Gavin L; Gutjahr, Marcus (2016): Incursions of southern-sourced water into the deep North Atlantic during late Pliocene glacial intensification. Nature Geoscience, 9(5), 375-379, https://doi.org/10.1038/ngeo2688
    Publication Date: 2023-02-24
    Description: The circulation and internal structure of the oceans exert a strong influence on Earth's climate because they control latitudinal heat transport and the segregation of carbon between the atmosphere and the abyss (Sigman et al., 2010, doi:10.1038/nature09149). Circulation change, particularly in the Atlantic Ocean, is widely suggested (Bartoli et al., 2005, doi:10.1016/j.epsl.2005.06.020; Haug and Tiedemann, 1998, doi:10.1038/31447; Woodard et al., 2014, doi:10.1126/science.1255586; McKay et al., 2012, doi:10.1073/pnas.1112248109) to have been instrumental in the intensification of Northern Hemisphere glaciation when large ice sheets first developed on North America and Eurasia during the late Pliocene, approximately 2.7 million years ago (Bailey et al., 2013, doi:10.1016/j.quascirev.2013.06.004). Yet the mechanistic link and cause/effect relationship between ocean circulation and glaciation are debated. Here we present new records of North Atlantic Ocean structure using the carbon and neodymium isotopic composition of marine sediments recording deep water for both the Last Glacial to Holocene (35-5 thousand years ago) and the late Pliocene to earliest Pleistocene (3.3-2.4 million years ago). Our data show no secular change. Instead we document major southern-sourced water incursions into the deep North Atlantic during prominent glacials from 2.7 million years ago. Our results suggest that Atlantic circulation acts as a positive feedback rather than as an underlying cause of late Pliocene Northern Hemisphere glaciation. We propose that, once surface Southern Ocean stratification (Sigman, et al., 2004, doi:10.1038/nature02357) and/or extensive sea-ice cover (McKay et al., 2012, doi:10.1073/pnas.1112248109) was established, cold-stage expansions of southern-sourced water such as those documented here enhanced carbon dioxide storage in the deep ocean, helping to increase the amplitude of glacial cycles.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 8
    Publication Date: 2023-06-27
    Keywords: 165-999A; AGE; Caribbean Sea; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg165; Noelaerhabdaceae, length; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 2754 data points
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  • 9
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Badger, Marcus P S; Chalk, Thomas B; Foster, Gavin L; Bown, Paul R; Gibbs, Samantha J; Sexton, Philip F; Schmidt, Daniela N; Pälike, Heiko; Mackensen, Andreas; Pancost, Richard D (2019): Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels. Climate of the Past Discussions, 15, 539-554, https://doi.org/10.5194/cp-15-539-2019
    Publication Date: 2023-06-21
    Description: Atmospheric _p_CO~2~ is a critical component of the global carbon system and is considered to be the major control of Earth's past, present and future climate. Accurate and precise reconstructions of its concentration through geological time are, therefore, crucial to our understanding of the Earth system. Ice core records document _p_CO~2~ for the past 800 kyrs, but at no point during this interval were CO~2~ levels higher than today. Interpretation of older _p_CO~2~ has been hampered by discrepancies during some time intervals between two of the main ocean-based proxy methods used to reconstruct _p_CO~2~: the carbon isotope fractionation that occurs during photosynthesis as recorded by haptophyte biomarkers (alkenones) and the boron isotope composition (δ^11^B) of foraminifer shells. Here we present alkenone and δ^11^B-based _p_CO~2~ reconstructions generated from the same samples from the Plio-Pleistocene at ODP Site 999 across a glacial-interglacial cycle. We find a muted response to _p_CO~2~ in the alkenone record compared to contemporaneous ice core and δ^11^B records, suggesting caution in the interpretation of alkenone-based records at low _p_CO~2~ levels. This is possibly caused by the physiology of CO~2~ uptake in the haptophytes. Our new understanding resolves some of the inconsistencies between the proxies and highlights that caution may be required when interpreting alkenone-based reconstructions of _p_CO~2~.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
    Publication Date: 2023-10-05
    Keywords: 165-999; AGE; Carbon dioxide; Caribbean Sea; COMPCORE; Composite Core; Joides Resolution; Leg165
    Type: Dataset
    Format: text/tab-separated-values, 12198 data points
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