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  1. Article ; Online: Extreme variability in atmospheric oxygen levels in the late Precambrian.

    Krause, Alexander J / Mills, Benjamin J W / Merdith, Andrew S / Lenton, Timothy M / Poulton, Simon W

    Science advances

    2022  Volume 8, Issue 41, Page(s) eabm8191

    Abstract: Mapping the history of atmospheric ... ...

    Abstract Mapping the history of atmospheric O
    Language English
    Publishing date 2022-10-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.abm8191
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Enhanced clay formation key in sustaining the Middle Eocene Climatic Optimum.

    Krause, Alexander J / Sluijs, Appy / van der Ploeg, Robin / Lenton, Timothy M / Pogge von Strandmann, Philip A E

    Nature geoscience

    2023  Volume 16, Issue 8, Page(s) 730–738

    Abstract: The Middle Eocene Climatic Optimum (around 40 million years ago) was a roughly 400,000-year-long global warming phase associated with an increase in atmospheric ... ...

    Abstract The Middle Eocene Climatic Optimum (around 40 million years ago) was a roughly 400,000-year-long global warming phase associated with an increase in atmospheric CO
    Language English
    Publishing date 2023-07-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 2396648-8
    ISSN 1752-0908 ; 1752-0894
    ISSN (online) 1752-0908
    ISSN 1752-0894
    DOI 10.1038/s41561-023-01234-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Erratum: Publisher Correction: Enhanced clay formation key in sustaining the Middle Eocene Climatic Optimum.

    Krause, Alexander J / Sluijs, Appy / van der Ploeg, Robin / Lenton, Timothy M / Pogge von Strandmann, Philip A E

    Nature geoscience

    2023  Volume 17, Issue 1, Page(s) 104

    Abstract: This corrects the article DOI: 10.1038/s41561-023-01234-y.]. ...

    Abstract [This corrects the article DOI: 10.1038/s41561-023-01234-y.].
    Language English
    Publishing date 2023-09-07
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2396648-8
    ISSN 1752-0908 ; 1752-0894
    ISSN (online) 1752-0908
    ISSN 1752-0894
    DOI 10.1038/s41561-023-01280-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Biological diversification linked to environmental stabilization following the Sturtian Snowball glaciation.

    Bowyer, Fred T / Krause, Alexander J / Song, Yafang / Huang, Kang-Jun / Fu, Yong / Shen, Bing / Li, Jin / Zhu, Xiang-Kun / Kipp, Michael A / van Maldegem, Lennart M / Brocks, Jochen J / Shields, Graham A / Le Hir, Guillaume / Mills, Benjamin J W / Poulton, Simon W

    Science advances

    2023  Volume 9, Issue 34, Page(s) eadf9999

    Abstract: The body fossil and biomarker records hint at an increase in biotic complexity between the two Cryogenian Snowball Earth episodes (ca. 661 million to ≤650 million years ago). Oxygen and nutrient availability can promote biotic complexity, but nutrient ( ... ...

    Abstract The body fossil and biomarker records hint at an increase in biotic complexity between the two Cryogenian Snowball Earth episodes (ca. 661 million to ≤650 million years ago). Oxygen and nutrient availability can promote biotic complexity, but nutrient (particularly phosphorus) and redox dynamics across this interval remain poorly understood. Here, we present high-resolution paleoredox and phosphorus phase association data from multiple globally distributed drill core records through the non-glacial interval. These data are first correlated regionally by litho- and chemostratigraphy, and then calibrated within a series of global chronostratigraphic frameworks. The combined data show that regional differences in postglacial redox stabilization were partly controlled by the intensity of phosphorus recycling from marine sediments. The apparent increase in biotic complexity followed a global transition to more stable and less reducing conditions in shallow to mid-depth marine environments and occurred within a tolerable climatic window during progressive cooling after post-Snowball super-greenhouse conditions.
    Language English
    Publishing date 2023-08-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adf9999
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Stepwise oxygenation of the Paleozoic atmosphere.

    Krause, Alexander J / Mills, Benjamin J W / Zhang, Shuang / Planavsky, Noah J / Lenton, Timothy M / Poulton, Simon W

    Nature communications

    2018  Volume 9, Issue 1, Page(s) 4081

    Abstract: Oxygen is essential for animal life, and while geochemical proxies have been instrumental in determining the broad evolutionary history of oxygen on Earth, much of our insight into Phanerozoic oxygen comes from biogeochemical modelling. The GEOCARBSULF ... ...

    Abstract Oxygen is essential for animal life, and while geochemical proxies have been instrumental in determining the broad evolutionary history of oxygen on Earth, much of our insight into Phanerozoic oxygen comes from biogeochemical modelling. The GEOCARBSULF model utilizes carbon and sulphur isotope records to produce the most detailed history of Phanerozoic atmospheric O
    Language English
    Publishing date 2018-10-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-018-06383-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Development of Iron Speciation Reference Materials for Palaeoredox Analysis

    Alcott, Lewis J. / Krause, Alexander J. / Hammarlund, Emma U. / Bjerrum, Christian J. / Scholz, Florian / Xiong, Yijun / Hobson, Andrew J. / Neve, Lesley / Mills, Benjamin J. W. / März, Christian / Schnetger, Bernhard / Bekker, Andrey / Poulton, Simon W.

    2020  

    Abstract: The development and application of geochemical techniques to identify redox conditions in modern and ancient aquatic environments has intensified over recent years. Iron (Fe) speciation has emerged as one of the most widely used procedures to distinguish ...

    Abstract The development and application of geochemical techniques to identify redox conditions in modern and ancient aquatic environments has intensified over recent years. Iron (Fe) speciation has emerged as one of the most widely used procedures to distinguish different redox regimes in both the water column and sediments, and is the main technique used to identify oxic, ferruginous (anoxic, Fe(II) containing) and euxinic (anoxic, sulfidic) water column conditions. However, an international sediment reference material has never been developed. This has led to concern over the consistency of results published by the many laboratories that now utilise the technique. Here, we report an interlaboratory comparison of four Fe speciation reference materials for palaeoredox analysis, which span a range of compositions and reflect deposition under different redox conditions. We provide an update of extraction techniques used in Fe speciation and assess the effects of both test portion mass, and the use of different analytical procedures, on the quantification of different Fe fractions in sedimentary rocks. While atomic absorption spectroscopy and inductively coupled plasma‐optical emission spectrometry produced comparable Fe measurements for all extraction stages, the use of ferrozine consistently underestimated Fe in the extraction step targeting mixed ferrous–ferric minerals such as magnetite. We therefore suggest that the use of ferrozine is discontinued for this Fe pool. Finally, we report the combined data of four independent Fe speciation laboratories to characterise the Fe speciation composition of the reference materials. These reference materials are available to the community to provide an essential validation of in‐house Fe speciation measurements.
    Subject code 621
    Language English
    Publisher Wiley
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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