Simulation of abrupt climate change induced by freshwater input to the North Atlantic Ocean

  title={Simulation of abrupt climate change induced by freshwater input to the North Atlantic Ocean},
  author={Syukuro Manabe and Ronald J. Stouffer},
TEMPERATURE records from Greenland ice cores1,2 suggest that large and abrupt changes of North Atlantic climate occurred frequently during both glacial and postglacial periods; one example is the Younger Dryas cold event. Broecker3 speculated that these changes result from rapid changes in the thermohaline circulation of the Atlantic Ocean, which were caused by the release of large amounts of melt water from continental ice sheets. Here we describe an attempt to explore this intriguing… 
An abrupt climate event in a coupled ocean–atmosphere simulation without external forcing
A drastic cooling event is reported in a 15,000-yr simulation of global circulation with present-day climate conditions without the use of such external forcing, indicating that internal atmospheric variability alone could have generated the extreme climate disruptions in this region.
Rapid changes in the mechanism of ocean convection during the last glacial period
High-amplitude, rapid climate fluctuations are common features of glacial times. The prominent changes in air temperature recorded in the Greenland ice cores are coherent with shifts in the magnitude
Coupled ocean‐atmosphere model response to freshwater input: Comparison to Younger Dryas Event
This study explores the responses of a coupled ocean-atmosphere model to the discharge of freshwater into the North Atlantic Ocean. In the first numerical experiment in which freshwater is discharged
Large Changes in Sea Ice Triggered by Small Changes in Atlantic Water Temperature
The sensitivity of sea ice to the temperature of inflowing Atlantic water across the Greenland–Scotland Ridge is investigated using an eddy-resolving configuration of the Massachusetts Institute of
Rapid changes in ocean circulation and atmospheric radiocarbon
A latitude-depth, coupled global ocean-ice-atmosphere model is extended to include a simple biosphere component. A physically reasonable adjustment of runoff into the North Atlantic is invoked to
Arctic sea ice export as a driver of deglacial climate
A widespread theory in paleoclimatology suggests that changes in freshwater discharge to the Nordic (Greenland, Norwegian, and Icelandic) Seas from ice sheets and proglacial lakes over North America
Modelling carbon cycle feedbacks during abrupt climate change


Rapid climate transitions in a coupled ocean–atmosphere model
RECENT geochemical data1,2 have challenged the view that rapid climate fluctuations in the North Atlantic at the end of the last glacial were caused by the thermohaline circulation of the ocean being
Correlations between climate records from North Atlantic sediments and Greenland ice
OXYGEN isotope measurements in Greenland ice demonstrate that a series of rapid warm-cold oscillations—called Dansgaard–Oeschger events—punctuated the last glaciation1. Here we present records of sea
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Century-scale effects of increased atmospheric C02 on the ocean–atmosphere system
SEVERAL studies have addressed the likely effects of CO2-induced climate change over the coming decades1–10, but the longer-term effects have received less attention. Yet these effects could be very
Salinity history of the northern Atlantic during the last deglaciation
The claim has been made (see Broecker et al., 1988) that production of North Atlantic Deep Water terminated during Younger Dryas time and that the onset of this termination occurred about 11,000
Interdecadal Variations of the Thermohaline Circulation in a Coupled Ocean-Atmosphere Model
Abstract A fully coupled ocean-atmosphere model is shown to have irregular oscillations of the thermohaline circulation in the North Atlantic Ocean with a time scale of approximately 50 years. The
A Zonally Averaged, Coupled Ocean-Atmosphere Model for Paleoclimate Studies
Abstract A zonally averaged ocean model for the thermohaline circulation is coupled to a zonally averaged, one-layer energy balance model of the atmosphere to form a climate model for paleoclimate
Interhemispheric asymmetry in climate response to a gradual increase of atmospheric CO2
THE transient response of a coupled ocean–atmosphere model to an increase of atmospheric carbon dioxide has been the subject of several studies1–8. The models used in these studies explicitly
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Coral reefs drilled offshore of Barbados provide the first continuous and detailed record of sea level change during the last deglaciation. The sea level was 121 ± 5 metres below present level during
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