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  • English  (7)
  • 1
    Publication Date: 2022-03-21
    Description: The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleo records suggest that the isotopic composition, described in terms of δ30Si, was generally much lower during glacial times than today. There is consensus that this variability is attributable to differing environmental conditions at the respective time of BSi production and sedimentation. The detailed links between environmental conditions and the isotopic composition of BSi in the sediments remain, however, poorly constrained. In this study, we explore the effects of a suite of offset boundary conditions during the LGM on the isotopic composition of BSi archived in sediments in an Earth System Model of intermediate complexity. Our model results suggest that a change in the isotopic composition of Si supply to the glacial ocean is sufficient to explain the observed overall low (er) glacial δ30Si in BSi. All other processes explored triggered model responses of either wrong sign or magnitude, or are inconsistent with a recent estimate of bottom water oxygenation in the Atlantic Sector of the Southern Ocean. Caveats, mainly associated with generic uncertainties in today's pelagic biogeochemical modules, remain.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    In:  Mixing Methods: Practical Insights from the Humanities in the Digital Age | Digital Humanities Research
    Publication Date: 2023-12-07
    Description: Countless climate images are in circulation on the internet, such as burning globes, polar bears and photos of global climate impacts. These images are networked and generate a specific view of climate change. Our case study engages in an intercultural image comparison based on Google Image queries. As an interdisciplinary team of experts drawn from art his- tory, media studies, interface design and computer graphics, our goal was to use a combination of qualitative and quantitative image analyses to explore the predominant discourses of digi- tised visual climate communication on the web. To this end, we automated the analysis of dif- ferent formal features of climate images (such as colour values, density and composition) with the aid of computer-driven methods (such as computer vision and machine learning) to build a corpus of thousands of images. Our focus was on image similarities, a concept shared by both image theory and computer analysis. In this chapter, we elucidate the outcome of our research on a conceptual and technical basis. The core issue addressed here is the manner in which art- historical methods (such as iconography and the concept of visual framing) are transformed when using computer-generated methods of computer vision and machine learning to anal- yse image similarities. This chapter focuses on our various insights while also reflecting on the general question of networked images on a methodological level. Ultimately, we were able to identify the promising potential but also the key limits of algorithmic image recognition and sorting when using machine learning to study images on the internet.
    Language: English
    Type: info:eu-repo/semantics/bookPart
    Format: application/pdf
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  • 3
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    In:  Recarbonization of the biosphere : ecosystems and the global carbon cycle
    Publication Date: 2023-07-18
    Language: English
    Type: info:eu-repo/semantics/bookPart
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  • 4
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    In:  Recarbonization of the biosphere : ecosystems and the global carbon cycle
    Publication Date: 2023-07-18
    Language: English
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  • 5
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    In:  Recarbonization of the biosphere : ecosystems and the global carbon cycle
    Publication Date: 2023-07-18
    Language: English
    Type: info:eu-repo/semantics/bookPart
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  • 6
    Publication Date: 2021-10-26
    Description: The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleorecords suggest that the isotopic composition, described in terms of δ30Si, was generally much lower during glacial times than today. There is consensus that this variability is attributable to differing environmental conditions at the respective time of BSi production and sedimentation. The detailed links between environmental conditions and the isotopic composition of BSi in the sediments remain, however, poorly constrained. In this study, we explore the effects of a suite of offset boundary conditions during the Last Glacial Maximum (LGM) on the isotopic composition of BSi archived in sediments in an Earth System Model of intermediate complexity (EMIC). Our model results suggest that a change in the isotopic composition of Si supply to the glacial ocean is sufficient to explain the observed overall low(er) glacial δ30Si in BSi. All other processes explored trigger model responses of either wrong sign or magnitude or are inconsistent with a recent estimate of bottom water oxygenation in the Atlantic Sector of the Southern Ocean. Caveats, mainly associated with generic uncertainties in today's pelagic biogeochemical modules, remain.
    Keywords: 551.9 ; 551.9 ; Earth System Model ; silicon isotopes ; Last Glacial Maximum ; biogeochemical modeling ; ocean ; sediment
    Language: English
    Type: map
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  • 7
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    In:  Geophysical Research Abstracts, Vol. 17, EGU2015-8991-1, 2015
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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