Search for dissertations about: "Dissertations ON geology"

Showing result 1 - 5 of 80 swedish dissertations containing the words Dissertations ON geology.

  2. 1. Dansgaard-Oeschger cycles and Heinrich events in western Europe - A diatom perspective

    Author : Linda Ampel; Barbara Wohlfarth; Jan Risberg; Sherilyn Fritz; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dansgaard-Oescher cycles; Heinrich events; MIS 3 and 2; diatoms; Les Echets; France; Quaternary geology; Kvartärgeologi; Quarternary Geology; kvartärgeologi;

    Abstract : The last glacial period was characterised by several abrupt climatic shifts referred to as Dansgaard-Oeschger (DO) cycles and Heinrich events. These shifts were most frequent between 60,000 and 20,000 years before present coinciding with Marine Isotope Stages (MIS) 3 and 2. READ MORE

  4. 2. Terrestrial response to Dansgaard-Oeschger cycles and Heinrich events : the lacustrine record of Les Echets, south-eastern France

    Author : Daniel S. Veres; Barbara Wohlfarth; John J. Lowe; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; lake sediments; palaeoclimate; organic matter; Dansgaard-Oeschger cycles; Heinrich events; MIS 3; Western Europe; Quaternary geology; Kvartärgeologi; Quarternary Geology; kvartärgeologi;

    Abstract : Marine Isotope Stage (MIS) 3 was an interval characterized by large and abrupt temperature changes on a millennial time scale, the so-called Dansgaard-Oeschger (DO) cycles and Heinrich events. Evidence for this high-frequency climate variability has been identified in many marine and ice core records. READ MORE

  5. 3. Late Holocene humidity variability in central Sweden

    Author : Sofia Andersson; Stefan Wastegård; Gunhild Rosqvist; Kristian Schoning; Frank Chambers; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; humidity change; stable isotopes; Chara spp; Pisidium spp; testate amoebae assemblages; humification; C N ratio; late Holocene; central Sweden; Quaternary geology; Kvartärgeologi; kvartärgeologi; Quarternary Geology;

    Abstract : The aim of this thesis was to reconstruct humidity variability in central Sweden during the late Holocene. A multi-proxy approach was used to infer humidity changes as recorded in a lake and a mire. Age-models were constructed based on radiocarbon dating and the Askja-1875 tephra. READ MORE

  6. 4. Late Quaternary ice sheet history and dynamics in central and southern Scandinavia

    Author : Timothy Johnsen; Helena Alexanderson; James T. Teller; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Scandinavian ice sheet; ice sheet dynamics; luminescence dating; cosmogenic exposure dating; geochronology; moraine; interstadial; deglaciation; nunatak; Quaternary geology; Kvartärgeologi; kvartärgeologi; Quarternary Geology;

    Abstract : Recent work suggests an emerging new paradigm for the Scandinavian ice sheet (SIS); one of a dynamically fluctuating ice sheet. This doctoral research project explicitly examines the history and dynamics of the SIS at four sites within Sweden and Norway, and provides results covering different time periods of glacial history. READ MORE

  7. 5. Influence of solar activity and environment on 10Be in recent natural archives

    Author : Ann-Marie Berggren; Ala Aldahan; Göran Possnert; Anne Hormes; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cosmogenic isotopes; beryllium; ice cores; varved lake sediments; accelerator mass spectrometry; co-precipitation; Quaternary geology; Kvartärgeologi;

    Abstract : Understanding the link between the Sun and climate is vital in the current incidence of global climate change, and 10Be in natural archives constitutes an excellent tracer for this purpose. As cosmic rays enter the atmosphere, cosmogenic isotopes like 10Be and 14C are formed. READ MORE