A5039737037- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Marine Biology and Ecology Research
- Evolution and Paleontology Studies
- Geological and Geophysical Studies
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Marine and environmental studies
- Polar Research and Ecology
- Geochemistry and Elemental Analysis
- Geomagnetism and Paleomagnetism Studies
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Reservoir Engineering and Simulation Methods
- Astro and Planetary Science
- Pleistocene-Era Hominins and Archaeology
Utrecht University
2016-2025
Pennsylvania State University
2023-2024
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2023
Tianjin University
2023
Aarhus University
2023
Science Oxford
2023
University of Oxford
2023
Weatherford College
2023
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2006
University of California, Santa Cruz
2005
The Paleocene-Eocene thermal maximum (PETM) has been attributed to the rapid release of ∼2000 × 10 9 metric tons carbon in form methane. In theory, oxidation and ocean absorption this should have lowered deep-sea pH, thereby triggering a (<10,000-year) shoaling calcite compensation depth (CCD), followed by gradual recovery. Here we present geochemical data from five new South Atlantic sections that constrain timing extent massive sea-floor carbonate dissolution coincident with PETM....
Realistic appraisal of paleoclimatic information obtained from a particular location requires accurate knowledge its paleolatitude defined relative to the Earth's spin-axis. This is crucial to, among others, correctly assess amount solar energy received at moment sediment deposition. The an arbitrary can in principle be reconstructed tectonic plate reconstructions that (1) restore motions between plates based on (marine) magnetic anomalies, and (2) reconstruct all spin axis using...
It is well established that greenhouse conditions prevailed during the Cretaceous Period (~ 145–66 Ma). Determining exact nature of greenhouse-gas forcing, climatic warming and climate sensitivity remains, however, an active topic research. Quantitative qualitative geochemical palaeontological proxies provide valuable observational constraints on climate. In particular, reconstructions sea-surface temperatures (SSTs) have been revolutionised firstly by recognition clay-rich sequences can...
Research Article| September 01, 2006 Extreme warming of mid-latitude coastal ocean during the Paleocene-Eocene Thermal Maximum: Inferences from TEX86 and isotope data J.C. Zachos; Zachos 1Earth Sciences Department, University California–Santa Cruz, Santa California 95060, USA Search for other works by this author on: GSW Google Scholar S. Schouten; Schouten 2Royal Netherlands Institute Sea Research, Department Marine Biogeochemistry Toxicology, P.O. Box 59, 1790 AB Den Burg, Texel, Bohaty;...
The warmest global temperatures of the past 85 million years occurred during a prolonged greenhouse episode known as Early Eocene Climatic Optimum (52–50 Ma). terminated with long-term cooling trend that culminated in continental-scale glaciation Antarctica from 34 Ma onward. Whereas early studies attributed transition to icehouse climates tectonic opening Southern Ocean gateways, more recent investigations invoked dominant role declining atmospheric gas concentrations (e.g., CO 2 )....
Constraining the greenhouse gas forcing, climatic warming and estimates of climate sensitivity across ancient large transient events is a major challenge to palaeoclimate research community. Here we provide new compilation synthesis available marine proxy temperature data largest these hyperthermals, Paleocene–Eocene Thermal Maximum (PETM). This includes application consistent calibrations all data, including most recent set for archaeal lipid-derived palaeothermometry. provides basis an...
Abstract. The early Eocene (56 to 48 million years ago) is inferred have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than those of present day. As such, study climate provides insight into how a super-warm Earth system behaves and offers an opportunity evaluate models under conditions high greenhouse gas forcing. Deep Time Model Intercomparison Project (DeepMIP) systematic model–model...
Significance Here, for the first time (to our knowledge), we are able to demonstrate unambiguously that impact at Cretaceous–Paleogene boundary (K–Pg, ∼66 Mya) was followed by a so-called “impact winter.” This winter result of injection large amounts dust and aerosols into stratosphere significantly reduced incoming solar radiation decades. Therefore, this phase will have been key contributory element in extinctions many biological clades, including dinosaurs. The K–Pg presents unique event...
During rapid global warming 56 million years ago, tropical sea surface temperatures exceeded 36°C and stressed eukaryotic plankton.
Near the Eocene's close (∼34 million years ago), climate system underwent one of largest shifts in Earth's history: Antarctic terrestrial ice sheets suddenly grew and ocean productivity patterns changed. Previous studies conjectured that poleward penetration warm, subtropical currents, East Australian Current (EAC) particular, caused Eocene warmth. Late opening an gateway between Australia Antarctica was to have disrupted EAC, cooled Antarctica, allowed develop. Here we reconstruct...
Tectonic changes that produced a deep Tasmanian Gateway between Australia and Antarctica are widely invoked as the major mechanism for Antarctic cryosphere growth Circumpolar Current (ACC) development during Eocene/Oligocene (E/O) transition (∼34–33 Ma). Ocean Drilling Program (ODP) Leg 189 recovered near‐continuous marine sedimentary records across E/O interval at four sites around Tasmania. These largely barren of calcareous microfossils but contain rich record siliceous‐ organic‐walled...
The impacts of the Paleocene‐Eocene thermal maximum (PETM) (∼55 Ma), one most rapid and extreme warming events in Earth history, are well characterized open marine terrestrial environments but less so on continental margins, a major carbon sink. Here, we present stable isotope, carbonate content, organic matter C:N ratio records through PETM from new outcrop sections California cores previously drilled New Jersey margin. Foraminifer δ 18 O data suggest that midlatitude shelves warmed by...
We reconstruct eustatic variations during the latest Paleocene and earliest Eocene (∼58–52 Ma). Dinoflagellate cysts, grain size fractions, organic biomarkers in marine sections at four sites from three continents indicate an increased distance to coast Paleocene‐Eocene thermal maximum (PETM). The same trend is recognized published records other around world. Together, data a rise PETM, beginning 20 200 ka before globally recorded negative carbon isotope excursion (CIE) ∼55.5 Ma. Although...