Vahlenkamp, Maximilian
Lade...
2 Ergebnisse
Gerade angezeigt 1 - 2 von 2
- Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Middle Eocene Paleoceanography and Astrochronology in the Western North Atlantic(2017-08-24); ; ; The middle Eocene (47.8-38 Ma) marks the transition from the early Cenozoic greenhouse into the late Cenozoic icehouse climate. The early Cenozoic was characterized by warm temperatures, high atmospheric CO2 concentration ( 1000 ppm) and a non-existent or minor cryosphere. The climatic cooling towards the major glaciation of Antarctica is only partially covered by sedimentary records from scientific deep-sea drilling, which allow for high- resolution paleoceanographic studies. In the context of anthropogenic CO2 emissions and consequent global warming, the study of the nature and causes of climatic variability and the role of the ocean in the climate system during greenhouse climate is one of the fundamental challenges of paleoclimatology. Studying past times of extreme warmth and elevated CO2 enables us to anticipate the magnitude and potential consequences of future climate change. To understand the sequence of climatic, biotic and tectonic events before, during and after the ...Dissertation506 322 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Holocene changes in sea-ice cover and polynya formation along the eastern North Greenland shelf: New insights from biomarker records(2020-01-30); ; ; ; Understanding the processes controlling the natural variability of sea ice in the Arctic, one of the most dynamic components of the climate system, can help to constrain the effects of future climate change in this highly sensitive area. For the first time, a high-resolution biomarker study was carried out to reconstruct past sea-ice variability off eastern North Greenland. This area is strongly influenced by cold surface waters and drift ice transported via the East Greenland Current, meltwater pulses from the outlet glaciers of the Northeast Greenland Ice Stream and the build-up of landfast ice. The well-dated Holocene sedimentary section of Core PS93/025 provides insights into variations of the sea-ice conditions (regional and local sea-ice signal), oceanic and atmospheric circulation and the biotic response to these changes. These biomarker records show a reduced to variable sea-ice cover during the early Holocene between 10.2 and 9.3 ka, followed by a steady increase in sea-ice conditions during the mid Holocene. During the last 5e6 ka, sea-ice conditions remained more stable representing a seasonal to marginal sea-ice situ- ation. Based on our biomarker records, stable sea-ice edge conditions, with a fully developed polynya situation occurred since the last 1 ka.Wissenschaftlicher ArtikelHeft:231278 265