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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

Nonlinearity of carbon cycle feedbacks

Creator:: Zickfeld, Kirsten, Eby, Michael, Matthews, H. Damon, Schmittner, Andreas, and Weaver, Andrew J.
Abstract:: Coupled climate–carbon models have shown the potential for large feedbacks between climate change, atmospheric CO₂ concentrations, and global carbon sinks. Standard metrics of this feedback assume that the response of land and ocean carbon uptake to CO₂ (concentration–carbon cycle feedback) and climate change (climate–carbon cycle feedback) combine linearly. This study...
Resource Type:: Article
Full Text:: MICHAEL EBY University of Victoria, Victoria, British Columbia, Canada H. DAMON MATTHEWS Concordia

Simulating the global distribution of nitrogen isotopes in the ocean

Creator:: Somes, Christopher J., Schmittner, Andreas, Galbraith, Eric D., Lehmann, Moritz F., Altabet, Mark A., Montoya, Joseph P., Letelier, Ricardo M., Mix, Alan C., Bourbonnais, Annie, and Eby, Michael
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 two stable nitrogen isotopes, 14N and 15N, in the nitrate (NO3−), phytoplankton, zooplankton, and detritus variables of the...
Resource Type:: Article
Full Text:: distribution of nitrogen isotopes in the ocean 2 Christopher J. Somes,1 Andreas Schmittner,1 Eric D. Galbraith

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

Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water Subduction: Paleoceanography

Creator:: Schmittner, Andreas, Galbraith, Eric D., Hostetler, Steven W., Pedersen, Thomas F., and Zhang, Rong
Abstract:: Paleoclimate records from glacial Indian and Pacific oceans sediments document millennial-scale fluctuations of subsurface dissolved oxygen levels and denitrification coherent with North Atlantic temperature oscillations. Yet the mechanism of this teleconnection between the remote ocean basins remains elusive. Here we present model simulations of the oxygen and nitrogen cycles that...
Resource Type:: Article
Full Text:: Atlantic Deep Water subduction 5 Andreas Schmittner,1 Eric D. Galbraith,2,3 Steven W. Hostetler,4,5 Thomas

Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction

Creator:: Schmittner, Andreas, Galbraith, Eric D., Hostetler, Steven W., Pedersen, Thomas F., and Zhang, Rong
Abstract:: Paleoclimate records from glacial Indian and Pacific oceans sediments document millennial-scale fluctuations of subsurface dissolved oxygen levels and denitrification coherent with North Atlantic temperature oscillations. Yet the mechanism of this teleconnection between the remote ocean basins remains elusive. Here we present model simulations of the oxygen and nitrogen cycles that...
Resource Type:: Article
Full Text:: Deep Water subduction Andreas Schmittner,1 Eric D. Galbraith,2,3 Steven W. Hostetler,4,5 Thomas F

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:: carbon sinks are weakened by climate changes (Eby et al., 2009). Since the UVic ESCM has a 3-D ocean

What is the skill of ocean tracers in reducing uncertainties about ocean diapycnal mixing and projections of the Atlantic Meridional Overturning Circulation?

Creator:: Schmittner, Andreas, Tonkonojenkov, Roman, Urban, Nathan M., Goes, Marlos, Haran, Murali, and Keller, Klaus
Abstract:: Current projections of the oceanic response to anthropogenic climate forcings are uncertain. Two key sources of these uncertainties are (1) structural errors in current Earth system models and (2) imperfect knowledge of model parameters. Ocean tracer observations have the potential to reduce these uncertainties. Previous studies typically consider each tracer...
Resource Type:: Article
Full Text:: probability distribution for Kbg using D 14C and CFC‐11 99 observations. Their approach uses a Gaussian

What is the skill of ocean tracers in reducing uncertainties about ocean diapycnal mixing and projections of the Atlantic Meridional Overturning Circulation?

Creator:: Goes, Marlos, Urban, Nathan M., Tonkonojenkov, Roman, Haran, Murali, Schmittner, Andreas, and Keller, Klaus
Abstract:: Current projections of the oceanic response to anthropogenic climate forcings are uncertain. Two key sources of these uncertainties are (1) structural errors in current Earth system models and (2) imperfect knowledge of model parameters. Ocean tracer observations have the potential to reduce these uncertainties. Previous studies typically consider each tracer...
Resource Type:: Article
Full Text:: probability distribution for Kbg using D 14C and CFC‐11 99 observations. Their approach uses a Gaussian

Model projections of the North Atlantic thermohaline circulation for the 21st century assessed by observations

Creator:: Schmittner, Andreas, Latif, M., and Schneider, B.
Abstract:: Most climate models predict a weakening of the North Atlantic thermohaline circulation for the 21st century when forced by increasing levels of greenhouse gas concentrations. The model spread, however, is rather large, even when the forcing scenario is identical, indicating a large uncertainty in the response to forcing. In order...
Resource Type:: Article
Full Text:: temperature (T), salinity (S) and pycnocline depth (D = R (rmax � r)zdz/R (rmax � r)dz) distributions during

ScholarsArchive@OSU

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

Nonlinearity of carbon cycle feedbacks

Simulating the global distribution of nitrogen isotopes in the ocean

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

Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water Subduction: Paleoceanography

Large fluctuations of dissolved oxygen in the Indian and Pacific oceans during Dansgaard-Oeschger oscillations caused by variations of North Atlantic Deep Water subduction

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

What is the skill of ocean tracers in reducing uncertainties about ocean diapycnal mixing and projections of the Atlantic Meridional Overturning Circulation?

What is the skill of ocean tracers in reducing uncertainties about ocean diapycnal mixing and projections of the Atlantic Meridional Overturning Circulation?

Model projections of the North Atlantic thermohaline circulation for the 21st century assessed by observations

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