GLORIA — GEOMAR Library Ocean Research Information Access

Treffer pro Seite

Treffer 1 - 3 | 3 Treffer

Sortierung

Digitale Medien

Changes in carbon dioxide during an oceanic anoxic event linked to intrusion into Gondwana coals (2005)

Wade-Murphy, Jessica ; Hesselbo, Stephen P. ; McElwain, Jennifer C.

[s.l.] : Macmillian Magazines Ltd.

Nature 435 (2005), S. 479-482

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The marine sedimentary record exhibits evidence for episodes of enhanced organic carbon burial known as ‘oceanic anoxic events’ (OAEs). They are characterized by carbon-isotope excursions in marine and terrestrial reservoirs and mass extinction of marine faunas. Causal mechanisms ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/nature03618

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Unbekannt

Toward a Cenozoic history of atmospheric CO 2 (2023)

Hönisch, Bärbel ; Royer, Dana L. ; Breecker, Daniel O. ; [weitere]

AAAS (American Association for the Advancement of Science)

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2024-02-23

Beschreibung: The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO 2 ) over long and short timescales, as well as potential drivers of evolutionary transitions. However, reconstructing CO 2 beyond direct measurements requires the use of paleoproxies and herein lies the challenge, as proxies differ in their assumptions, degree of understanding, and even reconstructed values. In this study, we critically evaluated, categorized, and integrated available proxies to create a high-fidelity and transparently constructed atmospheric CO 2 record spanning the past 66 million years. This newly constructed record provides clearer evidence for higher Earth system sensitivity in the past and for the role of CO 2 thresholds in biological and cryosphere evolution. Editor’s summary The concentration of atmospheric carbon dioxide is a fundamental driver of climate, but its value is difficult to determine for times older than the roughly 800,000 years for which ice core records are available. The Cenozoic Carbon dioxide Proxy Integration Project (CenCO2PIP) Consortium assessed a comprehensive collection of proxy determinations to define the atmospheric carbon dioxide record for the past 66 million years. This synthesis provides the most complete record yet available and will help to better establish the role of carbon dioxide in climate, biological, and cryosphere evolution. — H. Jesse Smith

Materialart: Article , PeerReviewed

Format: text

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

OceanRep: Artikel in einer Fachzeitschrift - begutachtet

PDF

Unbekannt

THE TRIASSIC-JURASSIC BOUNDARY CARBON-ISOTOPE EXCURSIONS EXPRESSED IN TAXONOMICALLY IDENTIFIED LEAF CUTICLES (2011)

BACON, KAREN L. ; BELCHER, CLAIRE M. ; HESSELBO, STEPHEN P. ; McELWAIN, JENNIFER C.

Society for Sedimentary Geology (SEPM)

In: PALAIOS 26: 461-469.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-01

Beschreibung: A negative stable carbon-isotope excursion (CIE) has been identified at sites across the globe in strata that span the Triassic-Jurassic boundary. Different studies have suggested that this negative CIE could be the result of either a change in vegetation or a massive perturbation in the global carbon cycle at this time. To determine which, 84 hand-picked leaf cuticle fragments from plant macrofossils previously identified to genus level were analyzed for stable carbon-isotope values. The samples were taken from known heights in nine plant beds spanning the Rhaetian-Hettangian (Upper Triassic-Lower Jurassic) at Astartekloft, East Greenland. We have constructed taxon-specific stable carbon-isotope curves for Ginkgoales and Bennettitales and compared these to an existing {delta}13C curve based on fossil wood from the same section. This study reveals that taxon-specific carbon-isotope curves based on the leaf data from these two seed-plant groups both record the same negative CIE as the fossil wood, despite having different ecological roles and different relative abundances in the section. Correspondence analysis of the macrofossil abundance data, where the plants are considered in their ecological groups, shows that the {delta}13C values bear no relationship to changes in vegetation. This result further suggests that vegetation change had little role in determining the {delta}13C values at this time. Considered together, the bulk cuticle and taxon-specific {delta}13C record indicate that the negative CIE at the Triassic-Jurassic boundary is likely to have been caused by a massive perturbation of the global carbon cycle and not by vegetation change.

Print ISSN: 0883-1351

Digitale ISSN: 0883-1351

Thema: Geologie und Paläontologie

Publiziert von Society for Sedimentary Geology (SEPM)

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

Treffer 1 - 3 | 3 Treffer