Sökning: "The Holocene."

Visar resultat 21 - 25 av 139 avhandlingar innehållade orden The Holocene..

  1. 21. Solar variability over the Holocene period : disentangling geomagnetic and solar influences on a new continuous 10Be record from Little Dome C, Antarctica

    Författare :Hoang Long Nguyen; MERGE: ModElling the Regional and Global Earth system; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Ice core; cosmogenic radionuclide; 10Be; 14C; solar activity; paleomagnetism; ; Holocene;

    Sammanfattning : Reliable information on solar activity over the Holocene period is important to predict the Sun in the future and to understand the mechanism behind the Sun-climate linkage. Presently, there are discrepancies in the proxy data of solar activity due to reasons that are not yet understood. LÄS MER

  3. 22. Human Impact on Vegetation of Coastal Estonia during the Stone Age

    Författare :Anneli Poska; Dagfinn Moe; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Estonia; pollen analysis; Holocene; pre-agrarian human impact; introduction of arable farming; Geovetenskap; Earth sciences; Geovetenskap; Quarternary Geology; kvartärgeologi;

    Sammanfattning : This thesis presents the dynamics of vegetation and human impact on the environment in coastal Estonia during the Holocene. The sediments of five mires and two lakes from the mainland and from Saaremaa island, and a cultural layer of an Early Mesolithic settlement at Pärnu River were investigated by means of pollen analysis (modern and fossil pollen spectra), 14C dating (AMS and conventional dating) and numerical analysis of pollen data (rarefaction analysis, zonation and principal components analysis). LÄS MER

  4. 23. Holocene climate and environmental change in high latitudes as recorded by stable isotopes in peat deposits

    Författare :Päivi Kaislahti Tillman; Steffen Holzkämper; Stefan Wastegård; Peter Kuhry; Thomas W. D. Edwards; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stable isotopes; Holocene; subarctic; climate; Sphagnum fuscum; kvartärgeologi; Quarternary Geology;

    Sammanfattning : In this thesis, stable carbon and oxygen isotopes in α-cellulose isolated from Sphagnum fuscum moss remains were used as climate proxies. The main focus was to implement the methods in records from high latitude peatlands in the Northern Hemisphere (west-central Canada and north-eastern European Russia), reconstruct palaeoclimate of the studied regions during the Holocene, and evaluate the compatibility of results with other proxy records, especially tree-ring isotope time-series. LÄS MER

  5. 24. The holocene history of the great Alvar of Öland

    Författare :Lars-König Königsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Växtgeografi; Öland; Geografi; Öland; Götaland; Sverige; Geologi; Paleontologi; Naturvetenskap; Floror; Växter; Botanik;

    Sammanfattning : .... LÄS MER

  7. 25. The Holocene Spread of Spruce in Scandinavia

    Författare :Thomas Giesecke; Keith Bennett; Richard Bradshaw; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quaternary geology; Picea abies; pollen analyses; tree migration; population dynamics; Kvartärgeologi; Quaternary geology; Kvartärgeologi;

    Sammanfattning : The Holocene spread of Picea abies in Scandinavia provides an excellent opportunity for detailed study of the dynamics of tree spread and population expansion. Early- and mid-Holocene macrofossil evidence for the presence of Picea abies in Scandinavia has questioned traditional interpretations of the timing and direction of its spread. LÄS MER