A5028150668- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Offshore Engineering and Technologies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Paleontology and Stratigraphy of Fossils
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Astronomy and Astrophysical Research
- Geological Modeling and Analysis
- Inertial Sensor and Navigation
- Geological and Geochemical Analysis
- Reservoir Engineering and Simulation Methods
- Gamma-ray bursts and supernovae
- Seismic Imaging and Inversion Techniques
- Oceanographic and Atmospheric Processes
- Planetary Science and Exploration
- Geological and Geophysical Studies
- Solar and Space Plasma Dynamics
- Pleistocene-Era Hominins and Archaeology
- Nuclear Physics and Applications
National Institute of Oceanography and Applied Geophysics
2022-2024
National Institute of Oceanography
2023
University of Pavia
2011-2023
Uppsala University
2013-2023
University of Tasmania
2015
International Ocean Discovery Program
2015
Marine phytoplankton play a fundamental role in marine ecosystems and are sensitive to changes ocean temperature associated properties (such as dissolved CO2 nutrient availability). Fossil time series recovered from the deep-sea unique archives of long-term adaptation evolution algae with mineralized parts, such coccolithophores diatoms. For example, ample evidence exists for compositional overturn extinctions plankton communities across Eocene Oligocene transition (EOT; ~34.5-33.7 Ma), when...
ABSTRACT This study focuses on Pleistocene–Holocene sediments from the Shatsky Rise (Ocean Drilling Program Site 1209B, NW Pacific Ocean). We quantify contribution of calcite made by coccoliths in oceanic sediments, investigating role calcareous nannoplankton during last 450 ka. Coccolith carbonate constitutes 60–90% bulk carbonate. accumulation rates (CARs) and CaCO 3 fine fraction confirm that coccolithophores are major contributors to export accumulation. Primary productivity shows...
IODP Expedition 350 was the first to be drilled in rear part of Izu-Bonin, although several sites had been arc axis fore-arc region; scientific objective understand evolution Izu arc, by drilling a deep-water volcaniclastic section with long temporal record (Site U1437). The is dominated series basaltic dacitic seamount chains up ~100-km roughly perpendicular front. Dredge samples from these are geochemically distinct front rocks, and undertaken this asymmetry. Site U1437 lies an ~20-km-wide...
Abstract. The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene–Oligocene transition was investigated at a high resolution Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, southeast Atlantic Ocean) compared with lower-resolution benthic foraminiferal record. During this time interval, global climate, which had been warm under levels atmospheric CO2 (pCO2) Eocene, transitioned into cooler climate Oligocene, overall lower pCO2. At 1263,...
Abstract Through a multidisciplinary approach based on novel micropaleontological and geochemical analyses, the main paleoceanographic paleoclimate changes that have influenced surface‐ deep‐water circulation in SW Pacific Ocean (Chatham Rise, eastern New Zealand) during last million years are reconstructed. This region represents key area for investigating climate evolution Pleistocene because here largely wind‐driven Antarctic Circumpolar Current interacts with west via Deep Western...
The Mid-Pleistocene Transition (MPT; 1.25–0.6 million years ago, Ma) is one of the most important and still debated climate reorganizations during which glacial/interglacial cycles switched from a 41-thousand (kyr) cycle (i.e. obliquity) to quasi-periodic 100-kyr (associated with orbital eccentricity). Variations in geometry can affect abundance distribution certain marine biota such as coccolithophores, group unicellular calcifying phytoplankton, whose skeletal remains – called nannofossils...
Abstract. The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene–Oligocene transition (~34.8–32.7 Ma) was investigated at high resolution Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, South East Atlantic Ocean), compared with a lower benthic foraminiferal record. During this time interval, global climate which had been warm Eocene, under levels atmospheric CO2 (pCO2), transitioned into cooler Oligocene, overall pCO2. At 1263, absolute...
Abstract. Studies on CO2 effects coccolithophores, unicellular calcifying phytoplankton, show species-specific responses, although only less than 5 % of the ~280 living species have been tested so far. Helicosphaera carteri significantly contributes to carbon fluxes and CaCO3 storage due its size high calcite production. Despite importance, few studies examined H. under experimental conditions, one has addressed rising CO2/decreasing pH. Being a large-sized, obligated calcifier species, an...
Abstract The Middle Pleistocene Transition represents an important reorganization of climate that switched from a 41‐kyr periodicity to quasiperiodic 100‐kyr cycle. Here, we have investigated this time interval using calcareous nannofossils midlatitude well‐preserved sedimentary record the Ocean Drilling Program Site 1209 in North West Pacific Ocean. We studied samples 1.45 0.45 Ma, looking for significant changes nannofossil assemblages. Micropaleontological data were processed information...
Investigating the trace elements contained in coccoliths, i.e., carbonate exoskeleton, of unicellular marine phytoplankton called coccolithophores, is fundamental for calibrating environmental climate proxies, which are key tools studying past and future changes. To date, lab-cultivated coccolithophores have been mainly used measuring retained within whereas geochemical studies fossil records limited by difficulty isolating monospecific samples from sediments containing highly diversified...