The joint Publications Committee of the Geochemical and Meteoritical Societies, the sponsoring societies of GCA have appointed Tais W. Dahl as associate editor for the leading international geochemical journal Geochimica et Cosmochimica Acta. The position will run at least through 2026. Geochimica et Cosmochimica Acta (GCA) is sponsored by the Geochemical Society and the Meteoritical … Read More
New project funded: Natural CO2 removal from a high-CO2 atmosphere
Deliberate carbon dioxide removal (CDR) from the atmosphere is necessary to keep globalwarming at safe levels in this century. Enhanced weathering and ocean fertilization are powerfulnatural CDR processes with potentials to counter global warming, but their impact andbiogeochemical consequences upon implementation are uncertain due to limited verification at theglobal scale in the real world. Past … Read More
Talks at Goldschmidt conference 2023 in Lyon
Current and former group members will be present and are presenting work at the annual Goldschmidt conference in geochemistry, including: Monday July 10, 2023 15:00 Feifei Zhang – Enhanced marine biological carbon pump as a trigger for Early Mississippian marine anoxia and climatic cooling Monday July 10, 2023 17:15 Julius Havsteen – Linking atmospheric oxygenation … Read More
Open Postdoc position: Computational Geoscience
One 2-year postdoc position is opening in our research group at the Globe Institute in collaboration with the Prof. Klaus Mosegaard from Computational Geophysics Group at the Niels Bohr Institute, both University of Copenhagen . Application deadline is March 1, 2023. Recently, core scanning XRF has paved the way for a complete refinement of the … Read More
Podcast on the colonization(s) of land and atmospheric evolution
Early vascular plant fossils tell us about the climate in which early vegetation grew In defense of Plants is a popular podcast (US) about botany and related sciences. In this week, Matt Candeias interviews Tais W. Dahl, who explains how the latest results published in Nature Comms change our understanding of how vegetation on land … Read More
New method yields provocative result: Only 600 ppm CO2 in the atmosphere when forests appeared
The first vascular plants on Earth were small shrub-like vegetation. When trees evolved ~385 million years ago, the CO2 level in the atmosphere did not change much and remained at a far lower levels than previously thought (2000-8000 ppm). With a new mechanistic proxy calibrated in modern club mosses, we have discovered that the atmospheric [...]
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”. Plants evolved in the aquatic realm … Read More
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