Dansgaard–Oeschger Oscillations in a Coupled Atmosphere–Ocean Climate Model

Sakai, Kotaro; Peltier, W. R.

doi:10.1175/1520-0442(1997)010<0949:dooiac>2.0.co;2

Cited by 85 publications

(64 citation statements)

References 23 publications

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“…They were absent during the Holocene, i.e., during the 10 4 years before present. The discovery of these rapid warmings led to proposing a number of possible explanations, some of them favoring the internal origin of the period approximately equal to 1.500 years [19,20,21], while other explanations assume a similar period due to an external astronomical forcing [22], i.e. a SR-type scenario.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Resemblances and differences in mechanisms of noise-induced resonance

Centurelli

Musacchio

Pasmanter³

et al. 2006

Physica A: Statistical Mechanics and its Applications

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Systems showing stochastic resonance (SR) or coherent resonance (CR) share some features, in particular the nearby periodic character of the signal. We show that in spite of this resemblance the different underlying dynamics can be detected in experimental data by studying the histogram of inter-spikes times and some statistical properties like two-times correlation functions. We discuss the possible relevance for climate modeling.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Resemblances and differences in mechanisms of noise-induced resonance

Centurelli

Musacchio

Pasmanter³

et al. 2006

Physica A: Statistical Mechanics and its Applications

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“…The climate model to be employed in this paper is essentially identical to that developed and employed in the context of our most recent discussion of Dansgaard-Oeschger oscillations (Sakai and Peltier, 1997). It originally consists of three primary components: a cryospheric component that describes the accumulation and flow of land ice stimulated by orbital insolation variations that will not be directly invoked in the present work; an atmospheric component consisting of a one-layer energy-balance model (EBM) that includes nonlinear seasonal ice (snow)-albedo feedback in the presence of orbital forcing; and finally an oceanic component that consists of two-dimensional (the vertical and one horizontal dimensions) coupled hydrodynamic slab representations of the major ocean basins.…”

Section: Model Overviewmentioning

confidence: 99%

“…The model contains neither an explicit hydrological cycle nor, of course, explicit fluid dynamics. The final component of the model, and the one most important for the present application, is the oceanic component that was first coupled to the climate model in the analyses of Sakai and Peltier (1997) in order to investigate the role of the oceans on very long timescales (millennia). This element of the model began life as a stand-alone module, the initial formulation of which, along with paleoceanographic applications, was described in Sakai and Peltier (1995).…”

Section: Model Overviewmentioning

confidence: 99%

“…More detailed discussion of these boundary conditions and of the coupling scheme employed to link the individual model components is found in Peltier (1996, 1997). In Sakai and Peltier (1997), we assumed that the surface of the North Atlantic continuously received considerable anomalous freshwater forcing during the glacial epoch due to surface runoff (iceberg calving) from the large ice-sheets that covered North America and Northwestern Europe, a forcing that has the effect of reducing the surface salinity at highlatitudes. This hypothesis was based upon the sea surface salinity reconstruction for LGM by Duplessy et al (1991) which clearly shows a sharp diminution of sea surface salinity (555).…”

Section: Model Overviewmentioning

confidence: 99%

“…For the purpose of the analyses we shall present, the same reduced model of low frequency climate system variability will be employed as that recently described in detail in Sakai and Peltier (1997). As we will demonstrate, the results of these analyses do appear to provide explanations both as to why the B/A warm period occurred and why it onset as abrupt as is recorded in the paleoclimate record.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Deglaciation-Induced Climate Variability

Sakai

Peltier

1998

Journal of the Meteorological Society of Japan

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A previously developed two-dimensional-basin model of the global thermohaline circulation has been asynchronously coupled to an atmospheric energy balance model in support of analyses of the low frequency variability of the climate system. The coupled model, which has previously delivered successful simulations of the Dansgaard-Oeschger oscillations revealed in deep ice-core isotopic data from Summit, Greenland, is herein applied to the last deglaciation event of the current ice age in order to investigate the response of the climate system to transient meltwater forcing. The model employs hydrological forcing functions that consist of two components, one that is related to sea level and constrained by coral-based records of LGM to present sea level history, and a second that is unrelated to sea level and is assumed to exist because of the existence of the continental ice sheets that bounded the region of the North Atlantic basin where deep water is today. Our results show that the model successfully explains the occurrence of a YoungerDryas-like cool period regardless of the detailed properties of the sea level-related meltwater event that is observed to have followed this millennium-long return to glacial conditions. In order to successfully explain the occurrence of the Bulling/Allerod warm period that occurred prior to the Y-D, however, the model requires the action of the additional "background" anomaly that is unrelated to sea level. We explore the impact on climate response of the properties of these two components of the anomalous forcing.

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Assessing millennial-scale variability during the Holocene: A perspective from the western tropical Pacific

2014

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We investigate the relationship between tropical Pacific and Southern Ocean variability during the Holocene using the stable oxygen isotope and magnesium/calcium records of cooccurring planktonic and benthic foraminifera from a marine sediment core collected in the western equatorial Pacific. The planktonic record exhibits millennial-scale sea surface temperature (SST) oscillations over the Holocene of~0.5°C while the benthic δ 18 O c document~0.10‰ millennial-scale changes of Upper Circumpolar Deep Water (UCDW), a water mass which outcrops in the Southern Ocean. Solar forcing as an explanation for millennial-scale SST variability requires (1) a large climate sensitivity and (2) a long 400 year delayed response, suggesting that if solar forcing is the cause of the variability, it would need to be considerably amplified by processes within the climate system at least at the core location. We also explore the possibility that SST variability arose from volcanic forcing using a simple red noise model. Our best estimates of volcanic forcing falls short of reproducing the amplitude of observed SST variations although it produces power at low-frequency similar to that observed in the MD81 record. Although we cannot totally discount the volcanic and solar forcing hypotheses, we are left to consider that the most plausible source for Holocene millennial-scale variability lies within the climate system itself. In particular, UCDW variability coincided with deep North Atlantic changes, indicating a role for the deep ocean in Holocene millennial-scale variability.

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Dansgaard–Oeschger Oscillations in a Coupled Atmosphere–Ocean Climate Model

Cited by 85 publications

References 23 publications

Resemblances and differences in mechanisms of noise-induced resonance

Resemblances and differences in mechanisms of noise-induced resonance

Deglaciation-Induced Climate Variability

Assessing millennial-scale variability during the Holocene: A perspective from the western tropical Pacific

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