Index Catalog // ScholarsArchive@OSU

Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export

Creator:: Oschlies, Andreas, Schulz, Kai G., Riebesell, Ulf, and Schmittner, Andreas
Abstract:: The primary impacts of anthropogenic CO2 emissions on marine biogeochemical cycles predicted so far include ocean acidification, global warming induced shifts in biogeographical provinces, and a possible negative feedback on atmospheric CO2 levels by CO2-fertilized biological production. Here we report a new potentially significant impact on the oxygen-minimum zones of...
Resource Type:: Article
Full Text:: suboxia by CO2-enhanced biotic carbon export Andreas Oschlies,1 Kai G. Schulz,1 Ulf Riebesell,1 and

A global model of the marine ecosystem for long-term simulations: Sensitivity to ocean mixing, buoyancy forcing, particle sinking, and dissolved organic matter cycling

Creator:: Schmittner, Andreas, Oschlies, Andreas, Giraud, X., Eby, M., and Simmons, H. L.
Abstract:: A new model of the marine ecosystem coupled into a global Earth System Climate Model suitable for long-term (multimillennial timescale) simulations is presented. The model is based on nitrate as the sole limiting nutrient. Prognostic equations for nutrients, phytoplankton, zooplankton, and detritus are solved online in the three-dimensional ocean circulation...
Resource Type:: Article
Full Text:: organic matter cycling A. Schmittner,1,2 A. Oschlies,3,4 X. Giraud,5,6 M. Eby,7 and H. L. Simmons8

Future changes in climate, ocean circulation, ecosystems, and biogeochemical cycling simulated for a business-as-usual CO2 emission scenario until year 4000 AD

Creator:: Schmittner, Andreas, Oschlies, Andreas, Matthews, H. Damon, and Galbraith, Eric D.
Abstract:: A new model of global climate, ocean circulation, ecosystems, and biogeochemical cycling, including a fully coupled carbon cycle, is presented and evaluated. The model is consistent with multiple observational data sets from the past 50 years as well as with the observed warming of global surface air and sea temperatures...
Resource Type:: Article
Full Text:: 4000 AD Andreas Schmittner,1 Andreas Oschlies,2 H. Damon Matthews,3 and Eric D. Galbraith4 Received 5

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

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

Impact of the Ocean’s Overturning Circulation on Atmospheric CO2

Creator:: Schmittner, Andreas, Brook, Edward J., and Ahn, Jinho
Abstract:: A coupled climate-carbon cycle model and ice core CO2 data from the last glacial period are used to explore the impact of changes in ocean circulation on atmospheric CO2 concentrations on millennial time scales. In the model, stronger wind driven circulation increases atmospheric CO2. Changes in the buoyancy driven deep...
Resource Type:: Part of Book
Full Text:: Andreas Schmittner College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

Abrupt deglacial climate changes in the North Pacific and implications for climate tipping points

Creator:: Praetorius, Summer Kate
Abstract:: Paleoclimate archives have revealed abrupt climate events that are superimposed on more gradual climate changes throughout the last glacial and deglacial periods. The underlying causes of such rapid climate changes are still poorly understood, but the strong expression of these events in northern hemisphere records likely points to climatic mechanisms...
Resource Type:: Dissertation
Full Text:: Prahl, Andy Ross, Andreas Schmittner, Jeremy Shakun, John Southon, Joseph Stoner, Matt Wolhowe, and

Using tracer observations to reduce the uncertainty of ocean diapycnal mixing and climate–carbon cycle projections

Creator:: Schmittner, Andreas, Urban, Nathan M., Keller, Klaus, and Matthews, Damon
Abstract:: What is the uncertainty of climate-carbon cycle projections in response to anthropogenic greenhouse gas emissions and how can we reduce this uncertainty? We address this question by quantifying the ability of available ocean tracer observations to constrain the values of diapycnal diffusivity in the pelagic ocean (Kv), a key uncertain...
Resource Type:: Article
Full Text:: uncertainty of ocean diapycnal 3 mixing and climate–carbon cycle projections 4 Andreas Schmittner,1 Nathan M

Assessing the effects of ocean diffusivity and climate sensitivity on the rate of global climate change

Creator:: Ross, Andrew, Matthews, H. Damon, Schmittner, Andreas, and Kothavala, Zavareh
Abstract:: The range in the projections of future climate warming can be attributed to the inherent uncertainty in the representation of climate model parameters and processes. In this study, we assess the effect of uncertainty in climate sensitivity and ocean heat uptake on the rate of future climate change. We apply...
Resource Type:: Article
Full Text:: , ANDREAS SCHMITTNER2 and ZAVAREH KOTHAVALA1, 1Department of Geography, Planning and Environment, Concordia

ScholarsArchive@OSU

Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export

A global model of the marine ecosystem for long-term simulations: Sensitivity to ocean mixing, buoyancy forcing, particle sinking, and dissolved organic matter cycling

Future changes in climate, ocean circulation, ecosystems, and biogeochemical cycling simulated for a business-as-usual CO2 emission scenario until year 4000 AD

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

Glacial greenhouse-gas fluctuations controlled by ocean circulation changes

Impact of the Ocean’s Overturning Circulation on Atmospheric CO2

Abrupt deglacial climate changes in the North Pacific and implications for climate tipping points

Using tracer observations to reduce the uncertainty of ocean diapycnal mixing and climate–carbon cycle projections

Assessing the effects of ocean diffusivity and climate sensitivity on the rate of global climate change

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