North Atlantic controlled depositional cycles in MIS 5e layered sediments from the deep Dead Sea basin

2017 ◽  
Vol 87 (1) ◽  
pp. 168-179 ◽  
Author(s):  
Daniel Palchan ◽  
Ina Neugebauer ◽  
Yael Amitai ◽  
Nicolas D. Waldmann ◽  
Markus J. Schwab ◽  
...  
Keyword(s):  
North Atlantic ◽  
Dead Sea ◽  
Interglacial Period ◽  
High Temporal Resolution ◽  
Solar Cycles ◽  
Last Interglacial ◽  
The North ◽  
Last Interglacial Period ◽  
The Dead ◽  
The North Atlantic Oscillation

AbstractThe drilled Inter-Continental Drilling Project core at the deeps of the Dead Sea reveals thick sequences of halite deposits from the last interglacial period, reflecting prevailing arid conditions in the lake’s watershed. Here, we examine sequences of intercalating evaporates (halite or gypsum) and fine-detritus laminae and apply petrographic, micro-X-ray fluorescence, and statistical tools to establish in high-temporal resolution the hydroclimatic controls on the sedimentation in the last interglacial Dead Sea. The time series of the thickness of the best-recovered core sections of the layered halite, detritus, and gypsum reveals periodicities of ~11, 7–8, and 4–5 yr, pointing to a North Atlantic control and possibly solar influence on the hydrology of the Dead Sea watershed during the regionally arid period of the last interglacial period. Similar periodicities were detected in the last glacial and modern sedimentary sequences of the Dead Sea and other archives of the central Levant, indicating a persistent impact of the solar cycles on regional hydrology, possibly through the effects of the North Atlantic Oscillation.

Variability of the North Atlantic thermohaline circulation during the last interglacial period

Nature ◽  
10.1038/36540 ◽  
1997 ◽  
Vol 390 (6656) ◽  
pp. 154-156 ◽  
Author(s):  
Jess F. Adkins§ ◽  
Edward A. Boyle ◽  
Lloyd Keigwin ◽  
Elsa Cortijo
Keyword(s):  
North Atlantic ◽  
Thermohaline Circulation ◽  
Interglacial Period ◽  
Last Interglacial ◽  
The North ◽  
Last Interglacial Period ◽  
The North Atlantic ◽  
Atlantic Thermohaline Circulation

A stagnation event in the deep South Atlantic during the last interglacial period

Science ◽  
2014 ◽  
Vol 346 (6216) ◽  
pp. 1514-1517 ◽  
Author(s):  
Christopher T. Hayes ◽  
Alfredo Martínez-García ◽  
Adam P. Hasenfratz ◽  
Samuel L. Jaccard ◽  
David A. Hodell ◽  
...  
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
Ice Age ◽  
Interglacial Period ◽  
Deep South ◽  
Last Interglacial ◽  
The North ◽  
Last Interglacial Period ◽  
Water Formation ◽  
The Antarctic

During the last interglacial period, global temperatures were ~2°C warmer than at present and sea level was 6 to 8 meters higher. Southern Ocean sediments reveal a spike in authigenic uranium 127,000 years ago, within the last interglacial, reflecting decreased oxygenation of deep water by Antarctic Bottom Water (AABW). Unlike ice age reductions in AABW, the interglacial stagnation event appears decoupled from open ocean conditions and may have resulted from coastal freshening due to mass loss from the Antarctic ice sheet. AABW reduction coincided with increased North Atlantic Deep Water (NADW) formation, and the subsequent reinvigoration in AABW coincided with reduced NADW formation. Thus, alternation of deep water formation between the Antarctic and the North Atlantic, believed to characterize ice ages, apparently also occurs in warm climates.

scholarly journals Lower oceanic <i>δ</i><sup>13</sup>C during the last interglacial period compared to the Holocene

2021 ◽  
Vol 17 (1) ◽  
pp. 507-528
Author(s):  
Shannon A. Bengtson ◽  
Laurie C. Menviel ◽  
Katrin J. Meissner ◽  
Lise Missiaen ◽  
Carlye D. Peterson ◽  
...  
Keyword(s):  
North Atlantic ◽  
Interglacial Period ◽  
Oceanic Circulation ◽  
Last Interglacial ◽  
The Holocene ◽  
Last Interglacial Period ◽  
Significant Difference ◽  
Depth Extent ◽  
Global Carbon

Abstract. The last time in Earth's history when high latitudes were warmer than during pre-industrial times was the last interglacial period (LIG, 129–116 ka BP). Since the LIG is the most recent and best documented interglacial, it can provide insights into climate processes in a warmer world. However, some key features of the LIG are not well constrained, notably the oceanic circulation and the global carbon cycle. Here, we use a new database of LIG benthic δ13C to investigate these two aspects. We find that the oceanic mean δ13C was ∼ 0.2 ‰ lower during the LIG (here defined as 125–120 ka BP) when compared to the Holocene (7–2 ka BP). A lower terrestrial carbon content at the LIG than during the Holocene could have led to both lower oceanic δ13C and atmospheric δ13CO2 as observed in paleo-records. However, given the multi-millennial timescale, the lower oceanic δ13C most likely reflects a long-term imbalance between weathering and burial of carbon. The δ13C distribution in the Atlantic Ocean suggests no significant difference in the latitudinal and depth extent of North Atlantic Deep Water (NADW) between the LIG and the Holocene. Furthermore, the data suggest that the multi-millennial mean NADW transport was similar between these two time periods.

scholarly journals Link between the North Atlantic Oscillation and the surface mass balance components of the Greenland Ice Sheet under preindustrial and last interglacial climates: a study with a coupled global circulation model

2018 ◽  
Vol 14 (11) ◽  
pp. 1707-1725
Author(s):  
Silvana Ramos Buarque ◽  
David Salas y Melia
Keyword(s):  
North Atlantic ◽  
Greenland Ice Sheet ◽  
Negative Phase ◽  
Surface Mass Balance ◽  
Last Interglacial ◽  
Surface Mass ◽  
The North ◽  
Nao Index ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract. The relationship between the surface mass balance (SMB) components (accumulation and melting) of the Greenland Ice Sheet (GrIS) and the North Atlantic Oscillation (NAO) is examined from numerical simulations performed with a new atmospheric stretched grid configuration of the Centre National de Recherches Météorologiques Coupled Model (CNRM-CM) version 5.2 under three periods: preindustrial climate, a warm phase (early Eemian, 130 ka BP) and a cool phase (late Eemian, 115 ka BP) of the last interglacial. The horizontal grid of the atmospheric component of CNRM-CM5.2 is stretched from the tilted pole on Baffin Bay (72∘ N, 65∘ W) in order to obtain a higher spatial resolution on Greenland. The correlation between simulated SMB anomalies averaged over Greenland and the NAO index is weak in winter and significant in summer (about 0.6 for the three periods). In summer, spatial correlations between the NAO index and SMB components display different patterns from one period to another. These differences are analyzed in terms of the respective influence of the positive and negative phases of the NAO on accumulation and melting. Accumulation in south Greenland is significantly correlated with the positive (negative) phase of the NAO in a warm (cold) climate. Under preindustrial and 115 ka BP climates, melting along the margins is more correlated with the positive phase of the NAO than with its negative phase, whereas at 130 ka BP it is more correlated with the negative phase of the NAO in north and northeast Greenland.

Rapid Reductions in North Atlantic Deep Water During the Peak of the Last Interglacial Period

Science ◽  
2014 ◽  
Vol 343 (6175) ◽  
pp. 1129-1132 ◽  
Author(s):  
E. V. Galaasen ◽  
U. S. Ninnemann ◽  
N. Irval  ◽  
H. F. Kleiven ◽  
Y. Rosenthal ◽  
...  
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
North Atlantic Deep Water ◽  
Interglacial Period ◽  
Last Interglacial ◽  
Last Interglacial Period

scholarly journals Link between the Surface Mass Balance of the Greenland Ice Sheet and the North Atlantic Oscillation under preindustrial and last interglacial climates: a study with a Coupled Global Circulation Model

2018 ◽  
Author(s):  
Silvana Ramos Buarque ◽  
David Salas y Melia
Keyword(s):  
North Atlantic ◽  
Greenland Ice Sheet ◽  
Negative Phase ◽  
Surface Mass Balance ◽  
Last Interglacial ◽  
Surface Mass ◽  
The North ◽  
Nao Index ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract. The relationship between the Surface Mass Balance (SMB) of the Greenland Ice Sheet (GrIS) and the North Atlantic Oscillation (NAO) is examined from numerical simulations performed with a new atmospheric stretched grid configuration of the Centre National de Recherches Météorologiques – Coupled Model (CNRM-CM) version 5.2 under three periods : preindustrial climate, a warm phase (early Eemian, 130 ka BP) and a cool phase (glacial inception, 115 ka BP) of the last interglacial. The horizontal grid of the atmospheric component of CNRM-CM5.2 is stretched from the tilted pole on the Baffin Bay (72° N, 65° W) in order to obtain a higher spatial resolution on Greenland. The correlation between simulated SMB anomalies averaged over Greenland and the NAO index is weak in winter and significant in summer (about 0.6 for the three periods). In summer, spatial correlations between the NAO index and SMB display different patterns from one period to another. These differences are analysed in terms of the respective influence of the positive and negative phases of the NAO on accumulation and melting. Accumulation in South Greenland is significantly correlated with the positive (negative) phase of the NAO in a warm (cold) climate. Under preindustrial and 115 ka climates, melting along the margins is more correlated with the positive phase of the NAO than with its negative phase, whereas at 130 ka it is more correlated with the negative phase of the NAO in North and North-East Greenland.

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