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Citations since 2017
4 Research Items
I'm a marine geochemist interested in effects of continental weathering processes on the oceans. Currently I'm working in a more bio-technical environment dealing with optical approaches to quantify different plankton organisms in seawater.
We present dissolved neodymium and hafnium concentrations and isotope compositions of surface and deep-water masses from the Bay of Biscay. Neodymium isotope signatures in surface waters of the Bay of Biscay are mostly dominated by local weathering inputs from the surrounding continental margin. Subsurface Eastern North Atlantic Central Water (ENAC...
The role of accessory minerals in the incongruent release of Hf and Pb during continental weathering and its implications for the generation of distinct seawater isotope compositions is subject of debate. While it has been suggested that radiogenic Hf and Pb isotope signatures released during the dissolution of rocks are controlled by the relative...
The past and present variability of ocean circulation and weathering inputs can be reconstructed from the geochemical composition of seawater and marine sediments. Among other proxies, the radiogenic isotope compositions of neodymium (Nd), hafnium (Hf) and lead (Pb) have been applied to reliably trace variations in the ocean that have been related...
Combined seawater radiogenic hafnium (Hf) and neodymium (Nd) isotope compositions were extracted from bulk sediment leachates and foraminifera of Site 1088, ODP Leg 177, 2082 m water depth on the Agulhas Ridge. The new data provide a continuous reconstruction of long and short-term changes in ocean circulation and continental weathering inputs sinc...
Available online xxxx Editor: J. Lynch-Stieglitz Keywords: paleoceanography paleoclimate Arctic Deep Water radiogenic isotopes glacial weathering onset of Northern Hemisphere Glaciation We present the first continuous records of dissolved radiogenic neodymium, hafnium, and lead isotope compositions of deep waters in the western Arctic Ocean, spanni...
I'm trying to measure Hf isotopes in CaCO3 rich (up to 98 %) sediment (and maybe uncleaned foram tests). To get reliable data on our machine I need ~20ng of Hf. However, it is really hard to leach Hf out of carbonate rich sediments. I don't know where in the leaching and purification process (Gutjahr et al., 2007) I loose or/and miss to dissolve the Hf. Has anybody an idea, why Hf could/would behave differently in presence of CaCO3?
Develop and establish an integrated plankton-community observation platform (IPOP) for in situ investigations of entire marine food webs. The platform will combine innovative design and recent technological advances in optics (e.g. electrically tunable lenses) into a novel instrument for ocean observation. The system will permit detailed analysis of plankton communities across a wide size range of organisms and multiple trophic levels (phytoplankton to fish larvae) over large spatial and temporal scales, thus overcoming the limitations of existing approaches for underwater imaging.
Automated recognition (by software) of Microzooplankton organisms (<200µm) in large sample volumes (>50mL). The prime challenge is the acquisition of optical focused images of a large sample area that is scanned. Subsequent image manipulations and organism recognition is achieved with established software-algorithms.
Understanding pathways of radiogenic Hf, Nd, and Pb in weathering solutions from continental sources as indicator of how glacial weathering effects contribute to the decoupling of Hf, Nd and Pb in seawater.