Abrupt change of Antarctic moisture origin at the end of Termination II

Masson‐Delmotte, Valérie; Stenni, Barbara; Blunier, Thomas; Cattani, O.; Chappellaz, J.; Cheng, Hai; Dreyfus, G.; Edwards, R.; Falourd, S.; Govin, Aline; Kawamura, Kenji; Johnsen, S. J.; Jouzel, Jean; Landais, A.; Lemieux‐Dudon, Bénédicte; Lourantou, A.; Marshall, Gareth J.; Minster, Bénédicte; Mudelsee, Manfred; Pol, K.; Röthlisberger, Regine; Selmo, Enricomaria; Waelbroeck, C.

doi:10.1073/pnas.0914536107

Cited by 79 publications

(63 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6) is reasonable , strengthening the case that a bipolar seesaw signal is required to reconcile the evolution of temperature between 130 and 125 ka. This inter-hemispheric bipolar seesaw pattern in temperature response during the penultimate deglaciation first suggested by CLIMAP Project Members (1984) was also highlighted in recent studies by Masson-Delmotte et al (2010) and Marino et al (2015), while such a pattern has also been shown during Termination 1 (Shakun et al, 2012). Thus, this hemispheric asynchrony represents an important feature of at least the last two glacial terminations.…”

Section: Resultsmentioning

confidence: 68%

Impact of meltwater on high-latitude early Last Interglacial climate

et al. 2016

View full text Add to dashboard Cite

Abstract. Recent data compilations of the early Last Interglacial period have indicated a bipolar temperature response at 130 ka, with colder-than-present temperatures in the North Atlantic and warmer-than-present temperatures in the Southern Ocean and over Antarctica. However, climate model simulations of this period have been unable to reproduce this response, when only orbital and greenhouse gas forcings are considered in a climate model framework. Using a full-complexity general circulation model we perform climate model simulations representative of 130 ka conditions which include a magnitude of freshwater forcing derived from data at this time. We show that this meltwater from the remnant Northern Hemisphere ice sheets during the glacialinterglacial transition produces a modelled climate response similar to the observed colder-than-present temperatures in the North Atlantic at 130 ka and also results in warmer-thanpresent temperatures in the Southern Ocean via the bipolar seesaw mechanism. Further simulations in which the West Antarctic Ice Sheet is also removed lead to warming in East Antarctica and the Southern Ocean but do not appreciably improve the model-data comparison. This integrated modeldata approach provides evidence that Northern Hemisphere freshwater forcing is an important player in the evolution of early Last Interglacial climate.

show abstract

Section: Resultsmentioning

confidence: 68%

Impact of meltwater on high-latitude early Last Interglacial climate

et al. 2016

View full text Add to dashboard Cite

show abstract

“…However, the moisture source likely moves between glacial and interglacial periods, as suggested by water tagging in atmospheric models (Delaygue et al, 2000) or abrupt shifts of d (Masson-Delmotte et al, 2010a). During glacial periods, northward shifts of the mean evaporation locations are expected to compensate the impact of SST cooling into T source .…”

Section: Comparison With Sst Records From Ocean Sedimentsmentioning

confidence: 99%

Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles

et al. 2012

Self Cite

View full text Add to dashboard Cite

Abstract.A single isotope ratio (δD or δ 18 O) of water is widely used as an air-temperature proxy in Antarctic ice core records. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source ( T source ) and at the precipitation site ( T site ) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve T source and T site information, different linear regression equations were proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, β site which is related to the sensitivity of d to T site . We show that different ranges of temperature and selections of isotopic model outputs may increase the value of β site by more than a factor of two. To explore the impacts of this coefficient on reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the β site coefficient strongly affect (i) the glacial-interglacial magnitude of T source ; (ii) the imprint of obliquity in T source and in the site-source temperature gradient. By contrast, we highlight the robustness of T site reconstruction using water isotopes records.

show abstract

“…The major limitation in using the data syntheses by Turney and Jones (2010) and McKay et al (2011) for analysis of the lig127k simulations and associated sensitivity experiments is that they are compilations of information about the maximum warmth during the LIG. Given that warming was not synchronous globally (Bauch and Erlenkeuser, 2008;Cortese et al, 2007;NEEM Community Members, 2013;Govin et al, 2012;Masson-Delmotte et al, 2010;Mor et al, 2012;Winsor et al, 2012), these syntheses do not represent a specific time slice. A more recent compilation by Capron et al (2014) has used harmonized chronologies for ice and marine records to produce records of the change in high-latitude temperature compared to present for four 2000-year long time slabs, and this approach has been expanded to include the fifth time slab (128-126 ka) for comparison with the lig127k simulation (Capron et al, 2017).…”

Section: Paleoenvironmental Data and Climate Reconstructions For Compmentioning

confidence: 99%

The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

et al. 2017

View full text Add to dashboard Cite

Abstract. Two interglacial epochs are included in the suite of Paleoclimate Modeling Intercomparison Project (PMIP4) simulations in the Coupled Model Intercomparison Project (CMIP6). The experimental protocols for simulations of the mid-Holocene (midHolocene, 6000 years before present) and the Last Interglacial (lig127k, 127 000 years before present) are described here. These equilibrium simulations are designed to examine the impact of changes in orbital forcing at times when atmospheric greenhouse gas levels were similar to those of the preindustrial period and the continental configurations were almost identical to modern ones. These simulations test our understanding of the interplay between radiative forcing and atmospheric circulation, and the connections among large-scale and regional climate changes giving rise to phenomena such as land-sea contrast and highlatitude amplification in temperature changes, and responses of the monsoons, as compared to today. They also provide an opportunity, through carefully designed additional sensitivity experiments, to quantify the strength of atmosphere, ocean, cryosphere, and land-surface feedbacks. Sensitivity experiments are proposed to investigate the role of freshwater forcing in triggering abrupt climate changes within interglacial epochs. These feedback experiments naturally lead to a focus on climate evolution during interglacial periods, which will be examined through transient experiments. Analyses of the sensitivity simulations will also focus on interactions between extratropical and tropical circulation, and the relationship between changes in mean climate state and climate variability on annual to multi-decadal timescales. The comparative abundance of paleoenvironmental data and of quantitative climate reconstructions for the Holocene and Last Interglacial make these two epochs ideal candidates for systematic evaluation of model performance, and such comparisons will shed new light on the importance of external feedbacks (e.g., vegetation, dust) and the ability of state-of-the-art models to simulate climate changes realistically.

show abstract

Abrupt change of Antarctic moisture origin at the end of Termination II

Cited by 79 publications

References 38 publications

Impact of meltwater on high-latitude early Last Interglacial climate

Impact of meltwater on high-latitude early Last Interglacial climate

Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles

The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

Contact Info

Product

Resources

About