Marine and terrestrial environmental changes in NW Europe preceding carbon release at the Paleocene-Eocene transition

Environmental changes associated with the Paleocene–Eocene thermal maximum (PETM, ∼56 Ma) have not yet been documented in detail from the North Sea Basin. Located within proximity to the North Atlantic igneous province (NAIP), the Kilda Basin, and the northern rain belt (paleolatitude 54 °N) during the PETM, this is a critical region for testing proposed triggers of atmospheric carbon release that may have caused the global negative carbon isotope excursion (CIE) in marine and terrestrial environments. The CIE onset is identified from organic matter δ13C in exceptional detail within a highly expanded sedimentary sequence. Pollen and spore assemblages analysed in the same samples for the first time allow a reconstruction of possible changes to vegetation on the surrounding landmass. Multiproxy palynological, geochemical, and sedimentologic records demonstrate enhanced halocline stratification and terrigenous deposition well before (103 yrs) the CIE, interpreted as due to either tectonic uplift possibly from a nearby magmatic intrusion, or increased precipitation and fluvial runoff possibly from an enhanced hydrologic cycle. Stratification and terrigenous deposition increased further at the onset and within the earliest CIE which, coupled with evidence for sea level rise, may be interpreted as resulting from an increase in precipitation over NW Europe consistent with an enhanced hydrologic cycle in response to global warming during the PETM. Palynological evidence indicates a flora dominated by pollen from coastal swamp conifers before the CIE was abruptly replaced with a more diverse assemblage of generalist species including pollen similar to modern alder, fern, and fungal spores. This may have resulted from flooding of coastal areas due to relative sea level rise, and/or ecologic changes forced by climate. A shift towards more diverse angiosperm and pteridophyte vegetation within the early CIE, including pollen similar to modern hickory, documents a long term change to regional vegetation

Erster Interdisziplinärer Workshop Maritime Systeme : aktuelle Ergebnisse aus laufenden Promotionsprojekten an der TUHH

Es handelt sich um die Sammlung der Beiträge zum ersten Interdisziplinären Workshop Maritime Systeme der TUHH. Folgende Beiträge sind enthalten: - Vereinfachte Bestimmung des effektiven Nachstroms in Manövriersituationen - Numerische Untersuchungen zur Grundberührung von Schiffen Betriebsgrenzen von Ladeoperationen im Seegang - Innovative lasergestützte Schweißfertigung im Schiffbau - Festigkeit von mit großem Luftspalt verschweißten Stößen von Schiffssektionen - Mehrskalenberechnungen mit Anwendungen auf zelluläre Materialien - Corporate Sustainability Management in der Containerschifffahrt - EMV Probleme auf modernen Schiffen - Source Localization and Tracking with a Swarm of Autonomous Underwater Vehicle