Paleoceanography and paleoclimate in the Nordic Seas and the northern North Atlantic during the last 22 000 years
Doctoral thesis
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https://hdl.handle.net/1956/2010Utgivelsesdato
2006-09-01Metadata
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Sammendrag
The paleoceanography of the Nordic Seas and the northern North Atlantic during glacial and deglacial times was studied, using oxygen isotopes and Mg/Ca of foraminifera. The specific objectives are listed below: 1) Sea surface temperatures (SST) during the Last Glacial Maximum (LGM, ∼20 000 years ago) were reconstructed, using oxygen isotopes of the planktonic foraminifer Neogloboquadrina pachyderma (sinistral). 2) The LGM climate (air temperatures, precipitation/moisture, air pressure, wind systems) was simulated, using the SSTs produced under Objective 1 as boundary conditions. 3) Mg/Ca ratios of N. pachyderma (sin.) were tested to see if they could be used to make surface/subsurface temperature estimates in the Nordic Seas for previous times. 4) Water mass exchanges between the North Atlantic and the Nordic Seas through the period 22 000 - 6000 years ago were studied. This period covers the LGM, the last deglaciation and the recent interglacial (Holocene). Benthic oxygen isotopes were used as the main proxy, supported by benthic carbon isotopes and planktonic oxygen isotopes.
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Paper I: Quaternary Science Reviews 24, Meland, M. Y; Jansen, E.; Elderfield, H., Constraints on SST estimates for the northern North Atlantic/Nordic Seas during the LGM, pp. 835-852. Copyright 2005 Elsevier. The published version is available at: http://dx.doi.org/10.1016/j.quascirev.2004.05.011Paper II: Climate Dynamics 26, Byrkjedal Ø.; Kvamstø, N. G.; Meland, M. Y.; Jansen E.; Sensitivity of last glacial maximum climate to sea ice conditions in the Nordic Seas, pp. 473-487. Copyright 2006 Springer Verlag. Fulltext not available due to publisher restrictions. The published version is available at: http://dx.doi.org/10.1007/s00382-005-0096-2
Paper III: Meland, M. Y.; Jansen, E.; Elderfield, H.; Dokken, T. M.; Olsen, A.; Bellerby, R. G. J., Mg/Ca ratios in the planktonic foraminifer Neogloboquadrina pachyderma (sinistral) in the northern North Atlantic/Nordic Seas, Geochemistry Geophysics Geosystems 7: Q06P14, 2006. Copyright 2006 The American Geophysical Union. Reproduced by permission of American Geophysical Union. The published version is available at: http://dx.doi.org/10.1029/2005GC001078
Paper VI: Meland, M. Y.; Dokken, T. M.; Jansen, E.; Hevrøy, K., Water mass properties and exchange between the Nordic Seas and the northern North Atlantic during the period 22-6 ka: benthic oxygen isotope evidence. Pre-print.