Sökning: "iskärna"

Hittade 2 avhandlingar innehållade ordet iskärna.

  1. 1. Planetary Timemaking : Paleoclimatology and the Temporalities of Environmental Knowledge, 1945-1990

    Författare :Erik Isberg; Sverker Sörlin; Sabine Höhler; Adam Wickberg; Etienne Benson; KTH; []
    Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; NATURVETENSKAP; NATURAL SCIENCES; paleoclimatology; environmental history; temporality; ice core; deep-sea core; North Atlantic; timemaking; theory of history; planetary-scale environmental knowledge; paleoklimatologi; miljöhistoria; temporalitet; iskärna; borrkärna; Nordatlanten; tidsskapande; historieteori; planetär miljökunskap; History of Science; Technology and Environment; Historiska studier av teknik; vetenskap och miljö;

    Sammanfattning : This thesis concerns the history of paleoclimatology in the postwar period. It follows the trajectory of two climate proxy records – ice cores and deep-sea cores – in the North Atlantic region, from their emergence as scientific objects in the 1940s to their incorporation into Earth System Science in the 1980s. LÄS MER

  3. 2. Nitrate stable isotopes and major ions in snow and ice from Svalbard

    Författare :Carmen Paulina Vega Riquelme; V. A. Pohjola; R. Pettersson; E. Isaksson; C. E. Bøggild; Kumiko Goto-Azuma; Uppsala universitet; []
    Nyckelord :nitrate stable isotopes; nitrate; NOx proxies; ice cores; percolation; ion relocation; Svalbard; stabila isotoper av nitrat; nitrat; indikator för kväveoxider; iskärnor; perkolation; joniska omlokalisering; Svalbard; Earth Science with specialization in Physical Geography; Geovetenskap med inriktning mot naturgeografi;

    Sammanfattning : Increasing atmospheric reactive nitrogen (Nr), as consequence of human activities, has generated accumulation of nitrate (NO3-) in Arctic regions. The Arctic has fragile nitrogen limited ecosystems that can be altered by increases of dry or wet deposition of Nr. LÄS MER