Sökning: "paleoclimatic"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet paleoclimatic.

1. 1. Paleoenvironmental and paleoclimatic changes in northeast Thailand during the Holocene

   Författare :Sakonvan Chawchai; Barbara Wohlfarth; Richard Bindler; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Paleoenvironment; paleoclimatic; sediment; peat; multi-proxy; Asian monsoon; the Holocene; Marine Geology; maringeologi;

   Sammanfattning : The long-term climatic and environmental history of Southeast Asia is still fragmentary. This thesis therefore aims at studying lake sediment/peat sequences using a multi-proxy approach to reconstruct the environmental history and the impact of past changes in monsoon variability and intensity on lake ecosystems in Thailand. LÄS MER

3. 2. Latest Miocene – Early Pliocene Paleoclimate and Phytoplankton Productivity

   Författare :Boris-Theofanis Karatsolis; Jorijntje Henderiks; Luc Beaufort; Uppsala universitet; []
   Nyckelord :Late Miocene; early Pliocene; IODP; paleoclimate; basin evolution; phytoplankton; paleoproductivity; Milankovitch cycles; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

   Sammanfattning : Paper IPre-Quaternary paleoclimate studies in Australia mainly focus on terrestrial records from the southeastern part of the continent. IODP Expedition 356 drilled on the northwestern Australian shelf, yielding Miocene-Pleistocene paleoclimate records in an area where climate archives are scarce. LÄS MER

4. 3. Spatial distribution of snow in Antarctica and other glacier studies using ground-penetrating radar

   Författare :Cecilia Richardson-Näslund; Robert W. Jacobel; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; GPR; ground-penetrating radar; radar soundings; snow accumulation; accumulation rate; spatial variability; Antarctica; Dronning Maud Land; cold surface layer; thermal regime; glacial cirques; Sweden; Antarktis; Glaciärer; Ackumulering av snö; Geography; Physical Geography; geografi med naturgeografisk inriktning;

   Sammanfattning : The overall aim of this thesis is to develop and exemplify the use of ground-penetrating radar (GPR) within the field of glaciology. The main focus is on the spatial distribution of snow in Dronning Maud Land, East Antarctica. LÄS MER

5. 4. Late Cenozoic Geoarchives from Lake Baikal, Siberia

   Författare :Tomasz Sapota; Ala Aldahan; Göran Possnert; Ihsan Al-Aasm; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quaternary geology; Lake Baikal; Be-10 isotope; chronology; paleoclimate; tectonics; geomagnetic field; cosmic rays; Kvartärgeologi; Quaternary geology; Kvartärgeologi;

   Sammanfattning : Three long sediment cores (BDP-98 – 600 m, BDP-96 – 200 m and BDP-93 – 100 m) drilled in Lake Baikal (Siberia) have been studied with the aims of establishing an absolute chronology and reconstructing paleoclimatic and paleoenvironmental changes in the region. The location of the lake at relatively high latitude and continental interior and a thick continuous sedimentary archive that developed in a rift system tectonic setting provide unique material for this investigation. LÄS MER

7. 5. Combining limnology and paleolimnology : a refined understanding of environmental sediment signal formation in a varved lake

   Författare :Dominique Béatrice Maier; Christian Bigler; Sebastian Diehl; Jasmine E. Saros; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; varved lake sediments; diatom sediment signal formation; sequential sediment trap; seasonal process timing; ice thinning; varve compaction; climate impact; catchment properties; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys;

   Sammanfattning : Paleoclimatic archives, such as lake sediments, extend our understanding of terrestrial and aquatic ecosystem dynamics in relation to climate variability beyond the period covered by instrumental data. In this context, annually laminated (i.e. LÄS MER