A5051669323- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Astro and Planetary Science
- Marine Biology and Ecology Research
- Groundwater and Isotope Geochemistry
- Marine Bivalve and Aquaculture Studies
- Geomagnetism and Paleomagnetism Studies
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Calcium Carbonate Crystallization and Inhibition
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Coral and Marine Ecosystems Studies
- Chemical Synthesis and Characterization
- Geophysics and Gravity Measurements
- Radioactive element chemistry and processing
- Global Energy and Sustainability Research
- Marine and environmental studies
- Scientific Research and Discoveries
- CO2 Sequestration and Geologic Interactions
University of Hawaiʻi at Mānoa
2015-2024
Research Corporation of The University of Hawaii
2024
University of Hawaii System
2009-2022
Honolulu University
2010
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
1999-2007
Lamont-Doherty Earth Observatory
2000-2002
Columbia University
2000-2002
Humans are continuing to add vast amounts of carbon dioxide (CO 2 ) the atmosphere through fossil fuel burning and other activities. A large fraction CO is taken up by oceans in a process that lowers ocean pH carbonate mineral saturation state. This effect has potentially serious consequences for marine life, which are, however, difficult predict. One approach address issue study geologic record, may provide clues about what future holds chemistry organisms. article reviews basic controls on...
Several hypotheses have been put forward to explain the onset of intensive glaciations on Greenland, Scandinavia, and North America during Pliocene epoch between 3.6 2.7 million years ago (Ma). A decrease in atmospheric CO 2 may played a role glaciations, but other tectonic oceanic events occurring at same time part as well. Here we present detailed estimates from boron isotopes planktic foraminifer shells spanning 4.6–2.0 Ma. Maximal gradually declined values around 410 μ atm early...
Avoiding environmental damage from ocean acidification requires reductions in carbon dioxide emissions regardless of climate change.
Abstract The Paleocene‐Eocene Thermal Maximum (PETM) has been associated with the release of several thousands petagrams carbon (Pg C) as methane and/or dioxide into ocean‐atmosphere system within ~10 kyr, on basis co‐occurrence a isotope excursion (CIE), widespread dissolution deep sea carbonates, and global warming. In theory, this rapid should have severely acidified surface ocean, though no geochemical evidence yet presented. Using boron‐based proxies for ocean carbonate chemistry, we...
In laboratory experiments with the coccolithophore species Emiliania huxleyi and Gephyrocapsa oceanica , ratio of particulate inorganic carbon (PIC) to organic (POC) production decreased increasing CO 2 concentration ([CO ]). This was due both reduced PIC enhanced POC at elevated [CO ]. Carbon dioxide concentrations covered a range from preindustrial level value predicted for 2100 according “business as usual” anthropogenic emission scenario. The results were used employ model in which...
A simple model of the CaCO 3 saturation state ocean is presented. It can be solved analytically and intended to identify fundamental controls on carbonate ion concentration. should also attract researchers unfamiliar with complex biogeochemical models. Despite its limitations, model‐calculated today's agrees well observations. In general, reveals three distinctly different modes operation: The “Strangelove Ocean” high supersaturation which dominated by inorganic precipitation, (2) “Neritan...
The glacial/interglacial rise in atmospheric p CO 2 is one of the best known changes paleoclimate research, yet cause for it still unknown. Forcing coupled ocean‐atmosphere‐biosphere box model global carbon cycle BICYCLE with proxy data over last glacial termination, we are able to quantitatively reproduce transient variations and its isotopic signatures (δ 13 C, Δ 14 C) observed natural climate archives. sensitivity Box Isotopic Carbon cYCLE (BICYCLE) high or low latitudinal comparable...
Climate trends on timescales of 10s to 100s millions years are controlled by changes in solar luminosity, continent distribution, and atmosphere composition. Plate tectonics affect geography, but also composition through volcanic degassing CO2 at subduction zones midocean ridges. So far, such estimates were based reconstructions ocean floor production for the last 150 My indirectly, sea level inversion before My. Here we quantitatively estimate reconstructing lithosphere evolution, using...
Abstract. The LOSCAR model is designed to efficiently compute the partitioning of carbon between ocean, atmosphere, and sediments on time scales ranging from centuries millions years. While a variety computationally inexpensive cycle models are already available, many missing critical sediment component, which indispensable for long-term integrations. One LOSCAR's strengths coupling ocean-atmosphere routines efficient module. This allows, instance, adequate computation CaCO3 dissolution,...
Abstract. About one third of the anthropogenic carbon dioxide (CO2) released into atmosphere in past two centuries has been taken up by ocean. As CO2 invades surface ocean, carbonate ion concentrations and pH are lowered. Laboratory studies indicate that this reduces calcification rates marine calcifying organisms, including planktic foraminifera. Such a reduction resulting from emissions not observed, or quantified field yet. Here we present findings study Western Arabian Sea uses shells...
Abstract. Past warm periods provide an opportunity to evaluate climate models under extreme forcing scenarios, in particular high ( > 800 ppmv) atmospheric CO2 concentrations. Although a post hoc intercomparison of Eocene ∼ 50 Ma) model simulations and geological data has been carried out previously, past high-CO2 have never evaluated consistent framework. Here, we present experimental design for three within the early latest Paleocene (the EECO, PETM, pre-PETM). Together with CMIP6...