Today my website got a new layout
Atmospheric composition
Join the webinar series on “Co-evolution of Life and the Planet”
University of Hamburg offers a webinar series on the co-evolution of life and the environment held on Tuesday’s from 16:15-17:00. You may sign up here. On Nov 1, 2022 Tais W. Dahl will give a webinar lecture entitled “The Impact of land colonization on Earth’s Climate and oxygenation state”.
The greatest animal radiation on Earth was promoted by a stable marine redox landscape
The greatest rise in marine biodiversity in all of Earth’s history surprisingly was not fuelled by ocean oxygenation. Instead, oceanic redox stability appears to have favoured increased ecosystem resilience and – ultimately – a massive rise in global biodiversity levels. Oxygen rise occurred later… PhD student Alvaro del Rey measured the uranium isotope composition of … Read More
Talk 6/7-2022: Dahl colloquium at IPM, Hamburg University
July 6th, 2022 @ 17:15. Institut für Pflanzen und Mikrobiologie (IPM) is at Ohnhorststr. 18 in Klein Flottbek, a suburb of Hamburg. Tais will give a lecture for the Institute for Plants and Microbiology (IPM) at Hamburg University entitled: “Atmospheric oxygenation and climatic cooling during the early colonization of the terrestrial environment by plants”. The presentation will … Read More
Telling actual time in the rock record
We have discovered a new method to tell time in the Geological record, using core scanning XRF analyses, which we have now applied to Cambrian and Ordovician rocks to refine the Geological Time Scale. The study, led by my PhD student Zhengfu Zhao, is now published in Nature Communications. The new method was first discovered … Read More
Field work in Malo Jezero, Mljet Croatia
[Croatia Nov 10,2021]: Abiotic aragonite precipitates in the modern seawater-fed lake and provide an opportunity to understand how trace elements gets into the carbonate rock record.
Podcast: The Geobiological History of Earth
Danish Science journalist Lone Frank interviews Tais W. Dahl about his research. Her podcast series is called “24 Questions to the Professor” and runs in Danish. The podcast went from the formation of the Earth, through microbial evolution and into the world of animals and the colonization of land. What drove environmental evolution and Earth’s … Read More
Tais is pitching a Science Slam in the Planetarium
On November 19, the Danish rapper Per Vers will orchestrate Science Slam in the Tycho Brahe Planetarium. The program is found here https://planetarium.dk/program/science-slam-faa-toptunet-din-viden-om-universet/. Tais will give a 7 minutes pitch from his research
EarthTalks at GEOCENTER Denmark
The Section for Geobiology at GLOBE has helped organizing the spring season of EarthTalks 2021, and we welcome interested students and researchers to participate over Zoom (link below). The talks will not be recorded. Earth Talks Lecture Series – Spring 2021 Friday afternoons 14:00-15:00 DK time (sharp) 23/4 – Prof. Sigur∂ur Gislason, University of Iceland The … Read More
Did land plants alter erosion rates on Earth?
A discussion arises from the recent review article in Chemical Geology, where Tais W. Dahl and Susanne Arens concluded that land plants did not forever increase the physical weathering rates of the continental crust. This conclusion was reached from the records of preserved sediment rock volume and the timing of plant-assisted weathering as recorded in … Read More