Dustin T. Harper, Richard E. Zeebe, Bärbel Hönisch, C. Schrader, Lucas Joost Lourens, James C. Zachos,
... by this author on: GSW Google Scholar Richard Zeebe; Richard Zeebe 2School of Ocean and Earth Science and Technology, ... High Street, Santa Cruz, California 95064, USA Richard Zeebe 2School of Ocean and Earth Science and Technology, ... Permissions Search Site Citation Dustin T. Harper, Richard Zeebe, Bärbel Hönisch, Cindy D. Schrader, Lucas J. Lourens, ...
Tópico(s): Marine Biology and Ecology Research
2017 - Geological Society of America | Geology
Joji Uchikawa, Sang Chen, John M. Eiler, Jess F. Adkins, Richard E. Zeebe,
... Δ47 of inorganic BaCO3 samples from Uchikawa and Zeebe (2012) (denoted as UZ12), which were quantitatively precipitated ...
Tópico(s): Groundwater and Isotope Geochemistry
2021 - Elsevier BV | Geochimica et Cosmochimica Acta
Richard E. Zeebe, Toby Tyrrell,
... over the last 100 million years (Tyrrell and Zeebe, 2004; TZ04 hereafter). Since then, multiple new and ...
Tópico(s): Isotope Analysis in Ecology
2019 - Elsevier BV | Geochimica et Cosmochimica Acta
Richard E. Zeebe, Lucas Joost Lourens,
... constraints between 50 and 60 million years ago. Zeebe and Lourens found an astronomical solution for that ...
Tópico(s): Geomagnetism and Paleomagnetism Studies
2019 - American Association for the Advancement of Science | Science
Tilman Hesse, Dieter Wolf‐Gladrow, Gerrit Lohmann, Jelle Bijma, Andreas Mackensen, Richard E. Zeebe,
... developed by Wolf-Gladrow et al. (1999) and Zeebe et al. (1999) in order to quantify the ...
Tópico(s): Isotope Analysis in Ecology
2014 - Elsevier BV | Marine Micropaleontology
K. Suffrian, Kai G. Schulz, Magdalena A. Gutowska, Ulf Riebesell, Markus Bleich,
... Sea water. Standard seawater composition was modified after Zeebe & Wolf-Gladrow (2001). All solutions were allowed to ... ASW solutions Artificial seawater solutions were designed after Zeebe & Wolf-Gladrow (2001). At a sea surface temperature ...
Tópico(s): Photosynthetic Processes and Mechanisms
2011 - Wiley | New Phytologist
K. Caldeira, David Archer, James Barry, R. G. J. Bellerby, Peter G. Brewer, Long Cao, Andrew G. Dickson, Scott C. Doney, H. Elderfield, Victoria J. Fabry, Richard A. Feely, Jean‐Pierre Gattuso, Peter M. Haugan, Ove Hoegh‐Guldberg, Atul K. Jain, Joan A. Kleypas, Chris Langdon, James C. Orr, Andy Ridgwell, Christopher L. Sabine, Brad A. Seibel, Yoshihisa Shirayama, Carol Turley, Andrew Watson, Richard E. Zeebe,
... and carbonate-ion concentrations [Stumm and Morgan, 1996; Zeebe and Wolf-Gladrow, 2001]. A body of literature ...
Tópico(s): Marine Biology and Ecology Research
2007 - American Geophysical Union | Geophysical Research Letters
Tópico(s): Marine and environmental studies
2005 - Elsevier BV | Geochimica et Cosmochimica Acta
Joji Uchikawa, Donald E. Penman, Dustin T. Harper, Jesse R. Farmer, James C. Zachos, Noah J. Planavsky, Richard E. Zeebe,
Tópico(s): Calcium Carbonate Crystallization and Inhibition
2022 - Elsevier BV | Geochimica et Cosmochimica Acta
Richard E. Zeebe, Lucas Joost Lourens,
Astronomical solutions provide insight into the Solar System's dynamical evolution and are indispensable tools in cyclostratigraphy and astrochronology. Constructing an absolute, fully calibrated astronomical time scale (ATS) has hitherto been hindered beyond ∼50 Ma because orbital calculations disagree before that age due to solar system chaos. We have recently developed a new approach that allows extending the fully calibrated astronomical time scale to ∼58 Ma. Here, we present geologic data and ...
Tópico(s): Astro and Planetary Science
2022 - Elsevier BV | Earth and Planetary Science Letters
Cenozoic carbon dioxide, weathering, and calcite compensation depth reconciled in a comprehensive carbon cycle model.
Tópico(s): Paleontology and Stratigraphy of Fossils
2021 - American Association for the Advancement of Science | Science Advances
The stable oxygen isotope fractionation factor between water and the aqueous hydroxide ion is a fundamental geochemical parameter widely used in the Earth Sciences and other fields. Studies from the 1960s reported α(H2O(l)-OH-(aq)), the fractionation factor between liquid H2O and aqueous OH−, theoretically as 1.046 and ∼1.048 (46‰ and 48‰ at 15 °C and 25 °C) and experimentally as 1.045 (45‰) at 15 °C. These, or similar values have been used in the literature for almost 60 years. Here I present quantum- ...
Tópico(s): Marine and coastal ecosystems
2020 - Elsevier BV | Geochimica et Cosmochimica Acta
Lauren Yumol, Joji Uchikawa, Richard E. Zeebe,
Kinetic isotope effects (KIEs) during the hydration of carbon dioxide (CO2) in aqueous solution are key to understanding various geochemical, physicochemical, and biological processes. Despite the growing interest in KIEs in natural systems (e.g., speleothem calcites, skeletal formation of corals, formation of cryogenic carbonates, and more), the currently available experimental data is limited to only a few studies. Here, we report results from laboratory experiments to constrain kinetic isotope fractionation ( ...
Tópico(s): CO2 Sequestration and Geologic Interactions
2020 - Elsevier BV | Geochimica et Cosmochimica Acta
The aqueous boric, hydrofluoric, and fluoroboric acid systems are key to a variety of applications, including boron measurements in marine carbonates for CO2 system reconstructions, chemical analysis and synthesis, polymer science, sandstone acidizing, fluoroborate salt manufacturing, and more. Here we present a comprehensive study of chemical equilibria and boron isotope partitioning in the aqueous boric acid–hydrofluoric acid system. We work out the chemical speciation of the various dissolved ...
Tópico(s): Marine and coastal ecosystems
2020 - Elsevier BV | Chemical Geology
Dustin T. Harper, Bärbel Hönisch, Richard E. Zeebe, Gary Shaffer, Laura L. Haynes, Ellen Thomas, James C. Zachos,
Abstract Eocene Thermal Maximum 2 (ETM‐2; 54.1 Ma) was the second largest Eocene hyperthermal. Like the Paleocene‐Eocene Thermal Maximum (PETM), ETM‐2 was characterized by massive carbon emissions and several degrees of global warming and thus can serve as a case study for assessing the impacts of rapid CO 2 emissions on ocean carbonate chemistry, biota, and climate. Marine carbonate records of ETM‐2 are better preserved than those of the PETM due to more subdued carbonate dissolution. As yet, however, ...
Tópico(s): Marine Biology and Ecology Research
2019 - Wiley | Paleoceanography and Paleoclimatology
Chao Ma, Stephen R. Meyers, Bradley B. Sageman,
... and La2011 models. Among 11 solutions calculated by Zeebe (2017), some show resonance transitions during this period, ...
Tópico(s): Astro and Planetary Science
2019 - Elsevier BV | Earth and Planetary Science Letters
Ilja Kocken, Marlow J. Cramwinckel, Richard E. Zeebe, Jack J. Middelburg, Appy Sluijs,
Abstract. Cenozoic stable carbon (δ13C) and oxygen (δ18O) isotope ratios of deep-sea foraminiferal calcite co-vary with the 405 kyr eccentricity cycle, suggesting a link between orbital forcing, the climate system, and the carbon cycle. Variations in δ18O are partly forced by ice-volume changes that have mostly occurred since the Oligocene. The cyclic δ13C–δ18O co-variation is found in both ice-free and glaciated climate states, however. Consequently, there should be a mechanism that forces the δ13C ...
Tópico(s): Methane Hydrates and Related Phenomena
2019 - Copernicus Publications | Climate of the past
María Ángeles Gallego, Axel Timmermann, Tobias Friedrich, Richard E. Zeebe,
Abstract. Recent observation-based results show that the seasonal amplitude of surface ocean partial pressure of CO2 (pCO2) has been increasing on average at a rate of 2–3 µatm per decade (Landschützer et al., 2018). Future increases in pCO2 seasonality are expected, as marine CO2 concentration ([CO2]) will increase in response to increasing anthropogenic carbon emissions (McNeil and Sasse, 2016). Here we use seven different global coupled atmosphere–ocean–carbon cycle–ecosystem model simulations conducted ...
Tópico(s): Marine and coastal ecosystems
2018 - Copernicus Publications | Biogeosciences
Jesse R. Farmer, Oscar Branson, Joji Uchikawa, Donald E. Penman, Bärbel Hönisch, Richard E. Zeebe,
The boron concentration (B/Ca ratio) and isotopic composition (δ11B) of biogenic calcite are widely applied to reconstruct past changes in seawater carbonate chemistry. Knowledge of B incorporation pathways into calcite is critical for these applications and for improving the theoretical basis of B proxies. While the canonical interpretation of δ11B holds that B in calcite predominantly derives from dissolved borate anion in seawater, recent studies of the B content, coordination, and isotopic composition ...
Tópico(s): Marine and coastal ecosystems
2018 - Elsevier BV | Geochimica et Cosmochimica Acta
Mathis P. Hain, Daniel M. Sigman, John A. Higgins, Gerald H. Haug,
Key Points Suspect parameters were changed to new reference The main results of original study hold true We demonstrate skill of MyAMI model, which is superior to existing correction factors
Tópico(s): Groundwater and Isotope Geochemistry
2018 - Wiley | Global Biogeochemical Cycles
Daniel J. Lunt, Matthew Huber, Eleni Anagnostou, Michiel Baatsen, Rodrigo Caballero, R. M. Deconto, Henk A. Dijkstra, Yannick Donnadieu, David Evans, Ran Feng, Gavin L. Foster, E. Gasson, Anna S. von der Heydt, Christopher J. Hollis, Gordon N. Inglis, Stephen Jones, Jeff Kiehl, Sandra Kirtland Turner, Robert Korty, Reinhardt Kozdon, Srinath Krishnan, Jean‐Baptiste Ladant, Petra M. Langebroek, Caroline H. Lear, Allegra N. LeGrande, Kate Littler, Paul J. Markwick, Bette L. Otto‐Bliesner, Paul N. Pearson, Christopher J. Poulsen, Ulrich Salzmann, Christine A. Shields, Kathryn E. Snell, Michael Stärz, J. R. Super, Clay Tabor, Jessica E. Tierney, Gregory J. L. Tourte, Aradhna Tripati, Garland R. Upchurch, Bridget S. Wade, Scott L. Wing, A. Winguth, Nicky M. Wright, James C. Zachos, Richard E. Zeebe,
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) climate model simulations and geological data has been carried out previously, models of past high-CO2 periods have never been evaluated in a consistent framework. Here, we present an experimental design for climate model simulations of three warm periods within the early Eocene ...
Tópico(s): Geology and Paleoclimatology Research
2017 - Copernicus Publications | Geoscientific model development
Joji Uchikawa, Dustin T. Harper, Donald E. Penman, James C. Zachos, Richard E. Zeebe,
The ratio of boron to calcium (B/Ca) in marine biogenic carbonates has been proposed as a proxy for properties of seawater carbonate chemistry. Applying this proxy to planktic foraminifera residing in the surface seawater largely in equilibrium with the atmosphere may provide a valuable handle on past atmospheric CO2 concentrations. However, precise controls on B/Ca in planktic foraminifera remain enigmatic because it has been shown to depend on multiple physicochemical seawater properties. To help ...
Tópico(s): Ocean Acidification Effects and Responses
2017 - Elsevier BV | Geochimica et Cosmochimica Acta
Peter I. Macreadie, Óscar Serrano, Damien T. Maher, Carlos M. Duarte, John Beardall,
... CO2 to the atmosphere (Frankignoulle et al. 1994; Zeebe and Wolf-Gladrow 2001). Specifically, for every mole ...
Tópico(s): Coral and Marine Ecosystems Studies
2017 - Wiley | Limnology and Oceanography Letters
Thomas Westerhold, Ursula Röhl, Barbara Donner, Thomas Frederichs, Wendy E C Kordesch, Steven M. Bohaty, David A Hodell, J. Laskar, Richard E. Zeebe,
Abstract Recognizing and deciphering transient global warming events triggered by massive release of carbon into Earth's ocean‐atmosphere climate system in the past are important for understanding climate under elevated pCO 2 conditions. Here we present new high‐resolution geochemical records including benthic foraminiferal stable isotope data with clear evidence of a short‐lived (30 kyr) warming event at 41.52 Ma. The event occurs in the late Lutetian within magnetochron C19r and is characterized ...
Tópico(s): Isotope Analysis in Ecology
2017 - Wiley | Geochemistry Geophysics Geosystems
Richard E. Zeebe, Thomas Westerhold, Kate Littler, James C. Zachos,
Multimillion-year proxy records across the Paleocene and Eocene show prominent variations on orbital time scales. The cycles, which have been identified at various sites across the globe, preferentially concentrate spectral power at eccentricity and precessional frequencies. It is evident that these cycles are an expression of changes in global climate and carbon cycling paced by astronomical forcing. However, little is currently known about the link between orbital forcing and the carbon cycle- ...
Tópico(s): Geological and Geochemical Analysis
2017 - American Geophysical Union | Paleoceanography
Bernard P. Boudreau, Yiming Luo,
... are similar to those calculated by Tyrrell and Zeebe (2004), using a different model. Secular variations in ...
Tópico(s): Marine Biology and Ecology Research
2017 - Elsevier BV | Earth and Planetary Science Letters
Abstract I report results from accurate numerical integrations of solar system orbits over the past 100 Myr with the integrator package HNBody . The simulations used different integrator algorithms, step sizes, and initial conditions, and included effects from general relativity, different models of the Moon, the Sun’s quadrupole moment, and up to 16 asteroids. I also probed the potential effect of a hypothetical Planet 9, using one set of possible orbital elements. The most expensive integration ( ...
Tópico(s): Solar and Space Plasma Dynamics
2017 - Institute of Physics | The Astronomical Journal
Geological records reveal a major perturbation in carbon cycling during the Paleocene–Eocene Thermal Maximum (PETM, ∼56 Ma), marked by global warming of more than 5 °C and a prominent negative carbon isotope excursion of at least 2.5‰ within the marine realm. The entire event lasted about 200,000 yr and was associated with a massive release of light carbon into the ocean–atmosphere system over several thousands of years. Here we focus on the terminal stage of the PETM, during which the ocean–atmosphere ...
Tópico(s): Paleontology and Stratigraphy of Fossils
2017 - Elsevier BV | Earth and Planetary Science Letters
Jacek Raddatz, Volker Liebetrau, Julie Trotter, Andres Rüggeberg, Sascha Flögel, Wolf‐Christian Dullo, Anton Eisenhauer, Silke Voigt, Malcolm T. McCulloch,
... of the coral by using the equation of Zeebe and Wolf-Gladow [2001] based on the measured ...
Tópico(s): Geology and Paleoclimatology Research
2016 - American Geophysical Union | Paleoceanography
Richard E. Zeebe, Andy Ridgwell, James C. Zachos,
Carbon release rates from anthropogenic sources reached a record high of ∼10 Pg C yr−1 in 2014. Geologic analogues from past transient climate changes could provide invaluable constraints on the response of the climate system to such perturbations, but only if the associated carbon release rates can be reliably reconstructed. The Palaeocene–Eocene Thermal Maximum (PETM) is known at present to have the highest carbon release rates of the past 66 million years, but robust estimates of the initial rate ...
Tópico(s): Methane Hydrates and Related Phenomena
2016 - Nature Portfolio | Nature Geoscience