Index Catalog // ScholarsArchive@OSU

Evaluation of a Variable Mixing Efficiency Parameterization on the Simulation of Last Glacial Maximum (LGM) Oceanic Circulation

Creator:: Thorstensson, Danil
Abstract:: This study tested the utility of a variable mixing efficiency formulation proposed by Mashayek, et al. (2017) for use in oceanographic models other than the modern, pre-industrial ocean. This formulation is used to calculate diapycnal (vertical) mixing due to unresolved subgrid-scale processes. Results from Last Glacial Maximum (LGM) simulations for...
Resource Type:: Honors College Thesis
Full Text:: Andreas Schmittner, Mentor, representing CEOAS

The Ocean Circulation and Carbon Cycle during the Last Glacial Maximum

Creator:: Muglia, Juan
Abstract:: During the Last Glacial Maximum (LGM, ∼ 21 ky before present) the atmospheric CO2 concentration was about 100 ppm lower than its pre-industrial (PI)value. The missing carbon from the atmosphere must have been stored in thedeep ocean during this period, but the mechanisms driving such re-distribution ofthe carbon cycle are...
Resource Type:: Dissertation
Full Text:: Circulation and Carbon Cycle during the Last Glacial Maximum Abstract approved: Andreas Schmittner During

Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation

Creator:: Somes, Christopher J.
Abstract:: We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations. The model includes prognostic tracers for the stable nitrogen isotopes, ¹⁴N and ¹⁵N, in the nitrate (NO₃ˉ), phytoplankton, zooplankton, and detritus variables of the marine...
Resource Type:: Masters Thesis
Full Text:: : Andreas Schmittner We present a new nitrogen isotope model incorporated into the three-dimensional

Exploring the persistence of Oregon white oak in the Willamette Valley

Creator:: Juhl, Eli
Abstract:: Over the last 150 years, Oregon white oak habitat in the Willamette Valley has been converted to support grass crops, orchards and vineyards, cities, and conifer forests, nearly extirpating it from the Willamette Valley. Yet Oregon white oak offers many ecosystem services to the Willamette Valley and its residents. Recent...
Resource Type:: Capstone Project
Full Text:: Advisor Dr. Megan Mobley MNR Committee Members Dr. Janean Creighton & Dr. Andreas Schmittner

Multi-Centennial Response of ENSO Under Varying Atmospheric CO2

Creator:: Alder, Jay R.
Abstract:: The El Niño/Southern Oscillation (ENSO) affects millions of people via global teleconnections in the form of drought and torrential rainfall that impact agriculture and food production in many countries. Yet how ENSO will respond to a warming world is uncertain and a greatly debated topic. The Intergovernmental Panel on Climate...
Resource Type:: Capstone Project

Glacial greenhouse-gas fluctuations controlled by ocean circulation changes

Creator:: Schmittner, Andreas and Galbraith, Eric D.
Abstract:: Earth's climate and the concentrations of the atmospheric greenhouse gases carbon dioxide (CO2) and nitrous oxide (N2O) varied strongly on millennial timescales during past glacial periods. Large and rapid warming events in Greenland and the North Atlantic were followed by more gradual cooling, and are highly correlated with fluctuations of...
Resource Type:: Article
Full Text:: controlled by ocean circulation changes Andreas Schmittner1 & Eric D. Galbraith2 Earth’s climate and the

Southern Ocean control of glacial AMOC stability and Dansgaard-Oeschger interstadial duration

Creator:: Buizert, Christo and Schmittner, Andreas
Abstract:: Glacial periods exhibit abrupt Dansgaard-Oeschger (DO) climatic oscillations that are thought to be linked to instabilities in the Atlantic meridional overturning circulation (AMOC). Great uncertainty remains regarding the dynamics of the DO cycle, as well as controls on the timing and duration of individual events. Using ice core data we...
Resource Type:: Article
Full Text:: stability and Dansgaard-Oeschger interstadial duration Christo Buizert1 and Andreas Schmittner1 1College

Glacial Atlantic overturning increased by wind stress in climate models

Creator:: Muglia, Juan and Schmittner, Andreas
Abstract:: Previous Paleoclimate Model Intercomparison Project (PMIP) simulations of the Last Glacial Maximum (LGM) Atlantic Meridional Overturning Circulation (AMOC) showed dissimilar results on transports and structure. Here we analyze the most recent PMIP3 models, which show a consistent increase (on average by 41 ± 26%) and deepening (663 ± 550 m)...
Resource Type:: Article

Empowering the Experts: Design, Implementation, and Evaluation of a Climate Change Communication Workshop

Creator:: Vickery, Katrina
Abstract:: As climate change and its associated environmental and socioeconomic impacts become increasingly severe and imminent across the United States, it has become imperative for the public to be aware of and actively engaged with this issue. Although scientists generally perceive outreach in a positive light, a critical barrier that tends...
Resource Type:: Masters Thesis
Full Text:: collaborators and committee members, without whom, this project would not have been possible. To Dr. Andreas

Reynolds Stress Tensor Systems and Applications to Nonuniqueness of Weak Solutions to Fluid

Creator:: Donaghue, Patrick E.
Abstract:: In the 1954 John Nash [1] showed, through use of an iterative scheme of approximate embedding maps, that the sphere S² could be isometrically embedded into a ball of any radius by a C¹ map. In the 1980's M. Gromov [2] generalized Nash's work to the h-principal and convex integration....
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Evaluation of a Variable Mixing Efficiency Parameterization on the Simulation of Last Glacial Maximum (LGM) Oceanic Circulation

The Ocean Circulation and Carbon Cycle during the Last Glacial Maximum

Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation

Exploring the persistence of Oregon white oak in the Willamette Valley

Multi-Centennial Response of ENSO Under Varying Atmospheric CO2

Glacial greenhouse-gas fluctuations controlled by ocean circulation changes

Southern Ocean control of glacial AMOC stability and Dansgaard-Oeschger interstadial duration

Glacial Atlantic overturning increased by wind stress in climate models

Empowering the Experts: Design, Implementation, and Evaluation of a Climate Change Communication Workshop

Reynolds Stress Tensor Systems and Applications to Nonuniqueness of Weak Solutions to Fluid

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