Inhalt

Sustainable Development Seminars

26 August 2021
Can Offshore Freshened Groundwater help mitigate water scarcity in arid coastal communities?
Amir Haroon
 

30.Sept. 2021
Sustaining a greener future wit base metal resources
Sarah Gleeson

 

28.10.2021
Slow slip affects the seismic hazard and can promote the occurrence of earthquakes: insight from natural and induced seismicity
Patricia Martínez-Garzón

 

23.11.2021 - 17:00

Long‐period astronomical forcing on the strength of Miocene westerlies in Central Asia
Silke Voigt
Abstract
The Miocene climate transition (MCT) represents a major global climatic shift towards sustained cooling of our planet. The mechanisms behind this cooling, its regional differentiation and the feedbacks involved are still a matter of debate. Continental settings of Central Asia witnessed increased desertification, but its timing and the interplay between regional and global climatic factors are not well understood. The lecture will provide recent insights about the regional climate evolution and the mechanisms of atmospheric moisture supply towards Central Asia by presenting data from a high-resolution, well-constrained terrestrial record of saline lake deposits spanning the MCT. The 450-m-thick succession exposed in the Aktau section in the Ili Basin, SE Kazakhstan, is representative for a phase of widespread lake formation. Regular depositional cycles representing changes in sedimentary facies and lake level, express a strong sensitivity to moisture availability under arid to semi-arid climate conditions. Time series analysis of climate sensitive geochemical and environmental parameters, together with the determination of absolute rock ages, enabled the identification of sedimentary cycles equivalent to climate influencing variations of the Earth's orbit and tilt angle (405 ka and 1.2 Ma long). These modulations of precession and obliquity affected the regional strength of atmospheric pressure gradients and westerly winds, which in turn was crucial for the magnitude of moisture transport evaporated from the Eastern Paratethys and Mediterranean seas. >>> Registrierung

25.11.2021 - 12:30 - 13:30
Optimal data acquisition for model-based georisk assessment
Julia Kowalski
 

16.12.2021 -  17:00
Climate variability between the mid-Cretaceous and Eocene hothouses peak-greenhouse intervals
Silke Voigt
Abstract
The Earth underwent long-term climatic cooling between the mid-Cretaceous and Eocene peak-greenhouse intervals. Globally averaged deep-water temperatures gradually declined by almost 10°C between 72 to 59 Ma and atmospheric CO2 levels were significantly reduced during this time. Although long-term changes in atmospheric CO2 are considered as a result of progressive continental fragmentation, changing rates of oceanic crust production and resulting volcanic degassing, the detailed mechanisms behind the cooling and subsequent major global warming culminating in the late Paleocene to Eocene greenhouse climate are still unknown. This lecture will review this enigmatic period by discussing recent proxy data for changes in ocean temperature, sea level and deep ocean circulation, as well as carbon cycle dynamics and potential silicate weathering feedbacks in the context of plate reorganization with special emphasis on the Atlantic Ocean opening.
 

27.01.2022 12:30 - 13:30
Storage of CO2 in the geological subsurface - CCUS in the context of climae protection and energy transition
Gabriela von Goerne
 

24.02.2022 - 12:30 - 13:30
Ocean warming and acidification since the Industrial Revolution documented in tropical corals
Henry Wu

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