A5035876154- Geology and Paleoclimatology Research
- Coral and Marine Ecosystems Studies
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Marine and fisheries research
- Geological formations and processes
- Ocean Acidification Effects and Responses
- Geological Studies and Exploration
- Marine and environmental studies
- Marine and coastal plant biology
- Marine animal studies overview
- Geological and Geophysical Studies
- Cephalopods and Marine Biology
- Pleistocene-Era Hominins and Archaeology
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Oceanographic and Atmospheric Processes
- Groundwater and Isotope Geochemistry
- Marine Bivalve and Aquaculture Studies
- Geological and Geochemical Analysis
- Pacific and Southeast Asian Studies
- Geochemistry and Geologic Mapping
- Nuclear Physics and Applications
GEOMAR Helmholtz Centre for Ocean Research Kiel
2010-2024
Goethe University Frankfurt
2016-2024
Institute of Geosciences
2019-2021
Goethe Institute
2021
Charles River Laboratories (Netherlands)
2016
Clinical Research Center Kiel
2014
Kiel University
2011
The Sr/Ca ratio of coral aragonite is used to reconstruct past sea surface temperature (SST). Twenty‐one laboratories took part in an interlaboratory study measurements. Results show bias can be significant, and the extreme case could result a range SST estimates 7°C. However, most data fall within narrower Porites reference material JCp‐1 now characterized well enough have certified value 8.838 mmol/mol with expanded uncertainty 0.089 following International Association Geoanalysts (IAG)...
Surface temperature is a fundamental parameter of Earth's climate. Its evolution through time commonly reconstructed using the oxygen isotope and clumped compositions carbonate archives. However, reaction kinetics involved in precipitation carbonates can introduce inaccuracies derived temperatures. Here, we show that dual analyses, i.e., simultaneous ∆47 ∆48 measurements on single phase, identify origin quantify extent these kinetic biases. Our results verify theoretical predictions evidence...
Brachiopod shells are the most widely used geological archive for reconstruction of temperature and oxygen isotope composition Phanerozoic seawater. However, it is not conclusive whether brachiopods precipitate their in thermodynamic equilibrium. In this study, we investigated potential impact kinetic controls on modern by measuring clumped compositions shells. Our results show that depart from equilibrium due to growth rate-induced effects. These departures line with incomplete hydration...
Abstract. The increasing pCO2 in seawater is a serious threat for marine calcifiers and alters the biogeochemistry of ocean. Therefore, reconstruction past-seawater properties their impact on ecosystems an important way to investigate underlying mechanisms better constrain effects possible changes future Cold-water coral (CWC) are biodiversity hotspots. Living close aragonite undersaturation, these corals serve as living laboratories well archives reconstruct boundary conditions...
Abstract Precipitation extremes with devastating socioeconomic consequences within the South American Monsoon System (SAMS) are expected to become more frequent in near future. The complexity SAMS behavior, however, poses severe challenges for reliable future projections. Thus, robust paleomonsoon records needed constrain high spatiotemporal variability response of rainfall different climatic drivers. This study uses Ti/Ca ratios from X‐ray fluorescence scanning a sediment core retrieved off...
Abstract Accurate reconstruction of seasonal atmospheric patterns the past is essential for reliable prediction how climate will evolve due to anthropogenic CO 2 forcing. The Eocene ‘hot house’ climate, as warmest epoch during Cenozoic, considered a potential analogue ‘high-CO ’ future scenarios. In this context, variations in seasonality are important changes mean annual conditions. Here we combine stable oxygen (δ 18 O) and dual clumped isotope (Δ 47 + Δ 48 ) measurements bivalve shell...
The Ludfordian (~424 Ma) “Lau Event” was the last of three Silurian mass extinctions. It is characterized by one largest carbon isotope excursions Phanerozoic with bulk rock δ13C increasing to ~8‰ in less than 1.5 million years [1]. Possible explanations include enhanced burial organic matter driven marine anoxia, changes weathering rates, and/or increased nutrient flux ocean [2]. However, underlying driving mechanism remains debated. To better inform...
The understanding of the paleoenvironment during initiation and early development deep cold-water coral carbonate mounds in NE Atlantic is currently a focus international research.The Integrated Ocean Drilling Program (IODP) Expedition 307 drilled 155 m high Challenger Mound Porcupine Seabight (SW off Ireland) order to investigate for first time sediments from base giant mound.In this study we resolution on 12 Site 1317 encompassing mound base.The start-up phase coincide with intensification...
Within the world's oceans, regionally distinct ecological niches develop due to differences in water temperature, nutrients, food availability, predation and light intensity. This results vertical dispersion of planktonic foraminifera on global scale. Understanding controls these modern-day distributions is important when using organisms for paleoceanographic reconstructions. As such, this study constrains modern depth habitats northern equatorial Indian Ocean, 14 foraminiferal species (G....
Abstract The complex deglacial to Holocene oceanographic development in the Gulf of Guayaquil (Eastern Equatorial Pacific) is reconstructed for sea surface and subsurface ocean levels from (isotope) geochemical proxies based on marine sediment cores. At surface, southern sourced Cold Coastal Water tropical Surface Water/Tropical are intimately related. In particular since ~10 ka, independent temperature capturing different seasons emphasize growing seasonal contrast Guayaquil, which areas...
High-latitude cold-water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6°N, Oslofjord 59°N) we applied boron isotopes (δ11B), Ba/Ca, Li/Mg, and U/Ca ratios reconstruct the environmental boundary conditions of CWC reef growth. The sedimentary record from reveals a lack corals between ~6.4 4.8 ka. question remains if this phenomenon is...
Abstract The continental expression of global cooling during the Miocene Climate Transition in Central Asia is poorly documented, as tectonically active setting complicates correlation Neogene regional and climatic developments. This study presents new geochemical data (CaSO 4 content, carbonate δ 13 C 18 O) from endorheic alluvial‐lacustrine Aktau succession (Ili Basin, south‐east Kazakhstan) combined with findings previously published facies evolution. Time series analysis revealed...
High-latitude cold-water coral reefs are particularly vulnerable to climate change due enhanced CO2 uptake in these regions. To evaluate their physiological functioning and potential application as pH archives, we retrieved both recent fossil samples of Lophelia pertusa along the Norwegian margin from Oslofjord (59°N), over Trondheimsfjord, Sula Lopphavet (70.6°N). Boron isotope analyses (δ11B) were undertaken using solution-based laser ablation multi-collector inductively coupled plasma...
Rationale Potassium (K) is a major component of several silicate minerals and seawater, and, therefore, constraining past changes in the potassium cycle promising way tracing large‐scale geological processes on Earth. However, [K] measurement using inductively coupled plasma mass spectrometry (ICP‐MS) challenging due to an ArH + interference, which may be similar magnitude K ion beam samples with <0.1% m/m [K]. Methods In this work, we investigated effect interference K/Ca data quality by...
Rising pressures from local and global stressors on marine benthic habitats require understanding of their effects habitat forming species like Crustose Coralline Algae (CCA), which play a crucial role in ecosystem diversity structure. Here, the impact mechanical damage warming CCA Lithophyllum stictiforme was investigated Mediterranean Sea using manipulative field transplant experiment that takes advantage temperature variations between depths 35 m 15 as proxies for current future climate...
Abstract. Here we present a comprehensive attempt to correlate aragonitic Na∕Ca ratios from Desmophyllum pertusum (formerly known as Lophelia pertusa), Madrepora oculata and caryophylliid cold-water coral (CWC) species with different seawater parameters such temperature, salinity pH. Living CWC specimens were collected 16 locations analyzed for their using solution-based inductively coupled plasma-optical emission spectrometry (ICP-OES) measurements. The results reveal no apparent...
The Arctic Svalbard Archipelago hosts the world’s northernmost cold-water ‘carbonate factories’ thriving here despite of presumably unfavourable environmental conditions and extreme seasonality. Two contrasting sites intense biogenic carbonate production, rhodolith beds in Mosselbukta North archipelago barnacle-mollusc dominated sediments accumulating strong hydrodynamic regime Bjørnøy-Banken south Spitsbergen, were targets RV Maria S. Merian cruise 55 June 2016. By integrating data from...