Journal ArticleDOI
Two Stable Equilibria of a Coupled Ocean-Atmosphere Model
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In this article, two stable equilibria have been obtained from a global model of the coupled ocean-atmosphere system developed at the Geophysical Fluid Dynamics Laboratory of NOAA.Abstract:
Two stable equilibria have been obtained from a global model of the coupled ocean-atmosphere system developed at the Geophysical Fluid Dynamics Laboratory of NOAA. The model used for this study consists of general circulation models of the atmosphere and the world oceans and a simple model of land surface. Starting from two different initial conditions, “asynchronous” time integrations of the coupled model, under identical boundary conditions, lead to two stable equilibria. In one equilibrium, the North Atlantic Oman has a vigorous thermohaline circulation and relatively saline and warm surface water. In the other equilibrium, there is no thermohaline circulation, and an intense halocline exists in the surface layer at high latitudes. In both integration the, air-sea exchange of water is adjusted to remove a systematic bias of the model that surpresses the thermohaline circulation in the North Atlantic. Nevertheless these results raise the intriguing possibility that the coupled system may have a...read more
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Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes
TL;DR: It is found that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500’yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago.
Journal ArticleDOI
Holocene climatic instability: A prominent, widespread event 8200 yr ago
Richard B. Alley,Paul Andrew Mayewski,Todd Sowers,Minze Stuiver,Kendrick C. Taylor,Peter U. Clark +5 more
TL;DR: The most prominent Holocene climatic event in Greenland ice-core proxies, with approximately half the amplitude of the Younger Dryas, occurred ∼8000 to 8400 yr ago.
Journal ArticleDOI
Abrupt onset and termination of the African Humid Period:rapid climate responses to gradual insolation forcing
Peter B deMenocal,Joseph D. Ortiz,Thomas P. Guilderson,Jess F. Adkins,Michael Sarnthein,Linda Baker,Martha Yarusinsky +6 more
TL;DR: A detailed (ca. 100 yr resolution) and well-dated (18 AMS ^(14)C dates to 23 cal. ka BP) record of latest Pleistocene-Holocene variations in terrigenous (eolian) sediment deposition at ODP Site 658C off Cap Blanc, Mauritania documents very abrupt, large-scale changes in subtropical North African climate as discussed by the authors.
References
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Climatological Atlas of the World Ocean
TL;DR: A project to objectively analyze historical ocean temperature, salinity, oxygen, and percent oxygen saturation data for the world ocean has recently been completed at the National Oceanic and Atmospheric Administration's (NOAA) Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey.
Journal ArticleDOI
Interocean Exchange of Thermocline Water
TL;DR: In this paper, it is proposed that this return flow is accomplished primarily within the ocean's warm water thermocline layer, where the main thermoclines of the ocean are linked as they participate in a thermohaline-driven global scale circulation cell associated with NADW formation.
Journal ArticleDOI
Thermohaline Convection with Two Stable Regimes of Flow
TL;DR: Free convection between two interconnected reservoirs, due to density differences maintained by heat and salt transfer to the reservoirs, is shown to occur sometimes in two different stable regimes, and may possibly be analogous to certain features of the oseanic circulation as discussed by the authors.
Journal ArticleDOI
North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature
Edward A. Boyle,Lloyd D Keigwin +1 more
TL;DR: In this paper, the authors show that during a surface cooling event 10,000 to 12,000 years ago, higher Cd/Ca and lower 13C/12C ratios are observed in benthic foraminifera shells from rapidly accumulating western North Atlantic sediments.
Journal ArticleDOI
The North Atlantic Ocean during the last deglaciation
TL;DR: The last deglacial warming of the high-latitude North Atlantic Ocean (40°65°) occurred in three discrete steps: in the southeast and central regions at 13 000 B.P., in the central and northern sectors at 10 000 B., and in the western (Labrador Sea) sector between 9000 and 6500 B., with a major influx of products of glacial wastage (meltwater and icebergs) as mentioned in this paper.