A5022844165- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
- Petroleum Processing and Analysis
- Geological and Geophysical Studies
- Metabolomics and Mass Spectrometry Studies
- Marine Biology and Ecology Research
- Astro and Planetary Science
- Microbial Community Ecology and Physiology
- Origins and Evolution of Life
- Marine and coastal ecosystems
- Coral and Marine Ecosystems Studies
- Geological Studies and Exploration
- Marine Sponges and Natural Products
- Geological and Geochemical Analysis
- Paleontology and Evolutionary Biology
- Enhanced Oil Recovery Techniques
- Wastewater Treatment and Nitrogen Removal
- Mass Spectrometry Techniques and Applications
- Linguistic research and analysis
- Food Chemistry and Fat Analysis
GFZ Helmholtz Centre for Geosciences
2021-2023
University of Potsdam
2023
Max Planck Institute for Biogeochemistry
2008-2021
University of Bremen
2013-2021
Massachusetts Institute of Technology
2010-2021
Staats- und Universitätsbibliothek Bremen
2019
Max Planck Society
2006-2015
Planetary Science Institute
2015
Newcastle University
2012
Curtin University
2008-2011
Significance The advent of oxygenic photosynthesis set the stage for evolution complex life on an oxygenated planet, but it is unknown when this transformative biochemistry emerged. existing hydrocarbon biomarker record requires that and eukaryotes emerged more than 300 million years before Great Oxidation Event [∼2.4 billion ago (Ga)]. We report hopane sterane concentrations measured in new ultraclean Archean drill cores from Australia are comparable to blank concentrations, yet their...
Significance The causal mechanisms of global glaciations are poorly understood. transition to a Neoproterozoic Snowball Earth after more than 1 Gy without glaciation represents the most dramatic episode climate change in geological record. Here we present new Re-Os geochronology, which, together with existing U-Pb ages, reveal that glacial period northwest Canada lasted ∼55 My. Additionally, an original method track tectonic influences on these climatic perturbations high-resolution coupled...
The enigmatic Ediacara biota (571 million to 541 years ago) represents the first macroscopic complex organisms in geological record and may hold key our understanding of origin animals. Ediacaran macrofossils are as "strange life on another planet" have evaded taxonomic classification, with interpretations ranging from marine animals or giant single-celled protists terrestrial lichens. Here, we show that lipid biomarkers extracted organically preserved unambiguously clarify their phylogeny....
The vast majority of freshly produced oceanic dissolved organic carbon (DOC) is derived from marine phytoplankton, then rapidly recycled by heterotrophic microbes. A small fraction this DOC survives long enough to be routed the interior ocean, which houses largest and oldest reservoir. reactivity depends upon its intrinsic chemical composition extrinsic environmental conditions. Therefore, recalcitrance an emergent property that analytically difficult constrain. New isotopic techniques track...
Abstract An approach to coordinated, spatially resolved, in situ carbon isotope analysis of organic matter and carbonate minerals, sulfur three‐ four‐isotope pyrite with an unprecedented combination spatial resolution, precision, accuracy is described. Organic from eleven rock samples Neoarchean drill core express nearly the entire range δ 13 C, 34 S, Δ 33 36 S known geologic record, commonly correlation morphology, mineralogy, elemental composition. A new analytical (including a set...
Abstract. A growing body of observations has revealed rapid changes in both the total inventory and distribution marine oxygen over latter half 20th century, leading to increased interest extending oxygenation records into past. The use paleo-oxygen proxies potential extend spatial temporal range current records, constrain pre-anthropogenic baselines, provide datasets necessary test climate models under different boundary conditions, ultimately understand how ocean responds beyond...
Climate change threatens the Himalayas and billions of people dependent on its resources water. Warming temperatures lead to melting glaciers, extended growing seasons, degradation permafrost peatlands, releasing significant amounts carbon stored for millennia. This process alters ecosystems triggers cascading effects soil vegetation. How thaw cycling within different landscapes is an open question in many ecosystems. Here, we investigate organic dynamics a two wetland sites located at...
Abstract Eukaryotic algae rose to ecological relevance after the Neoproterozoic Snowball Earth glaciations, but causes for this consequential evolutionary transition remain enigmatic. Cap carbonates were globally deposited directly these they are usually organic barren or thermally overprinted. Here we show that uniquely-preserved cap dolostones of Araras Group contain exceptional abundances a newly identified biomarker: 25,28-bisnorgammacerane. Its secular occurrence, carbon isotope...
Abstract Fossilized lipids offer a rare glimpse into ancient ecosystems. 2-Methylhopanes in sedimentary rocks were once used to infer the importance of cyanobacteria as primary producers throughout geological history. However, discovery hopanoid C-2 methyltransferase (HpnP) Alphaproteobacteria led downfall this molecular proxy. In present study, we re-examined distribution HpnP new phylogenetic framework including recently proposed candidate phyla and re-interpreted revised record...