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Evaluation of Different Methods to Assess Model Projections of the Future Evolution of the Atlantic Meridional Overturning Circulation

Creator:: Schneider, Birgit, Latif, M., and Schmittner, Andreas
Abstract:: Climate models predict a gradual weakening of the North Atlantic meridional overturning circulation (MOC) during the twenty-first century due to increasing levels of greenhouse gas concentrations in the atmosphere. Using an ensemble of 16 different coupled climate models performed for the Fourth Assessment Report (AR4) of the Intergovernmental Panel on...
Resource Type:: Article
Full Text:: the Future Evolution of the Atlantic Meridional Overturning Circulation BIRGIT SCHNEIDER Laboratoire

Simple Mechanistic Models of Middepth Meridional Overturning

Creator:: Samelson, R. M.
Abstract:: Two idealized, three-dimensional, analytical models of middepth meridional overturning in a basin with a Southern Hemisphere circumpolar connection are described. In the first, the overturning circulation can be understood as a “pump and valve” system, in which the wind forcing at the latitudes of the circumpolar connection is the pump...
Resource Type:: Article
Full Text:: prediction of the middepth meridional overturning circulation. Acknowledgments. This research was supported

A Simple Dynamical Model of the Warm-Water Branch of the Middepth Meridional Overturning Cell

Creator:: Samelson, R. M.
Abstract:: A reduced-gravity model is presented of the warm-water branch of the middepth meridional overturning circulation in a rectangular basin with a circumpolar connection. The model describes the balance between production of warm water by Ekman advection across the circumpolar current, dissipation of warm water by eddy fluxes southward across the...
Resource Type:: Article
Full Text:: meridional overturning circulation in a rectangular basin with a circumpolar connection. The model describes

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:: by the ocean’s circulation. Impact of the Ocean’s Overturning Circulation on Atmospheric CO2

Mid-Pliocene shifts in ocean overturning circulation and the onset of Quaternary-style climates

Creator:: Sarnthein, Michael, Bartoli, Greta, Prange, Michael, Schmittner, Andreas, Schneider, Birgit, Weinelt, Mara, Andersen, N., and Garbe-Schönberg, D.
Abstract:: A major tipping point of Earth's history occurred during the mid-Pliocene: the onset of major Northern-Hemisphere Glaciation (NHG) and of pronounced, Quaternary-style cycles of glacial-to-interglacial climates, that contrast with more uniform climates over most of the preceding Cenozoic and continue until today (Zachos et al., 2001). The severe deterioration of...
Resource Type:: Article
Full Text:: carbon reservoirs, in particular which changes in ocean Meridional Overturning Circulation (MOC) may have

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:: meridional overturning circulation (AMOC) have often been invoked to explain the physical characteristics of

Modeling studies of ocean circulation using inverse methods and bifurcation theory

Creator:: Vernieres, Guillaume
Abstract:: We present a study of the ocean circulation using state of the art numerical and data assimilation techniques. The second chapter of the thesis presents the development and application of generalized inversion to a simple dynamical model of Lake Kinneret. The intent was to develop the necessary tools to implement...
Resource Type:: Dissertation
Full Text:: Ocean Circulation Using Inverse Methods and Bifurcation Theory Abstract approved Robert N. Miller We

Impact of floods versus routing events on the thermohaline circulation

Creator:: Meissner, Katrin J. and Clark, Peter U.
Abstract:: The last deglaciation was interrupted by three major cooling events, the Younger Dryas, the Preboreal Oscillation and the 8.2-ka cold event. As the Laurentide Ice Sheet retreated, different outlets from Lake Agassiz became available causing the proglacial lake to drain to a new level in a rather short timescale (flood)...
Resource Type:: Article
Full Text:: question remains as to how its effect on the Atlantic meridional overturning circulation (AMOC) compares to

The Tropical Eastern Pacific Seasonal Cycle: Assessment of Errors and Mechanisms in IPCC AR4 Coupled Ocean–Atmosphere General Circulation Models

Creator:: de Szoeke, Simon P. and Xie, Shang-Ping
Abstract:: Warmer SST and more rain in the Northern Hemisphere are observed year-round in the tropical eastern Pacific with southerly wind crossing the equator toward the atmospheric heating. The southerlies are minimal during boreal spring, when two precipitation maxima straddle the equator. Fourteen atmosphere–ocean coupled GCMs from the Coupled Model Intercomparison...
Resource Type:: Article
Full Text:: meridional atmospheric circulation is difficult to discern from the multimodel ensemble, indicating that

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event

Creator:: Carlson, Anders E., Clark, Peter U., Haley, Brian A., Klinkhammer, Gary P., Simmons, Kathleen, Brook, Edward J., and Meissner, Katrin J.
Abstract:: The Younger Dryas cold interval represents a time when much of the Northern Hemisphere cooled from ≈12.9 to 11.5 kiloyears B.P. The cause of this event, which has long been viewed as the canonical example of abrupt climate change, was initially attributed to the routing of freshwater to the St....
Resource Type:: Article
Full Text:: attendant reduction in Atlantic meridional overturning circulation. However, this mechanism has recently

ScholarsArchive@OSU

Evaluation of Different Methods to Assess Model Projections of the Future Evolution of the Atlantic Meridional Overturning Circulation

Simple Mechanistic Models of Middepth Meridional Overturning

A Simple Dynamical Model of the Warm-Water Branch of the Middepth Meridional Overturning Cell

Impact of the Ocean’s Overturning Circulation on Atmospheric CO2

Mid-Pliocene shifts in ocean overturning circulation and the onset of Quaternary-style climates

Glacial greenhouse-gas fluctuations controlled by ocean circulation changes

Modeling studies of ocean circulation using inverse methods and bifurcation theory

Impact of floods versus routing events on the thermohaline circulation

The Tropical Eastern Pacific Seasonal Cycle: Assessment of Errors and Mechanisms in IPCC AR4 Coupled Ocean–Atmosphere General Circulation Models

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event

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