Late Pliocene changes in the North Atlantic Current

Naafs, B. David A.; Stein, Rüdiger; Hefter, Jens; Khélifi, Nabil; Schepper, Stijn De; Haug, Gerald H.

doi:10.1016/j.epsl.2010.08.023

Cited by 117 publications

(186 citation statements)

References 72 publications

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“…However, an overall increase in wind speed from the late Pliocene toward the present does not agree with modeling results that indicate stronger westerly winds during the late Pliocene warm period in the North Atlantic (Haywood et al, 2000), or at most only little changes in atmospheric circulation north of~40°N (Brierley et al, 2009). These model results also concur with surface ocean characteristics at Site U1313 that indicate more vigorous ocean circulation during the late Pliocene relative to the early Pleistocene (Naafs et al, 2010). An additional important consideration in this regard is that the westerlies respond mainly to changes in the thermal contrast in the middle of the atmosphere rather than to changes at the surface and the suggestion that glacials are associated with stronger winds is not supported by ocean circulation data (Toggweiler and Russell, 2008).…”

Section: Variations In Aeolian Inputsupporting

confidence: 76%

“…3), continuing the long-term trend that began in the late Pliocene (Naafs et al, 2010). During the Pliocene, SSTs were generally warmer than present, even during some glacials.…”

Section: Sea Surface Temperaturesmentioning

confidence: 88%

“…Creating a common depth scale allows data from different holes to be combined and compared and resolves conflicts in stratigraphic depth between holes that exist in the mcd scale. This amcd-scale was already used in several studies using material from Site U1313 (Ferretti et al, 2010;Naafs et al, 2010Naafs et al, , 2011Stein et al, 2009). Site U1313B was selected as the master hole because it is one of the deepest continuously cored holes and it is part of the primary splice that is being studied by many others.…”

Section: Sampling Strategy Site U1313mentioning

confidence: 99%

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Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Naafs

Hefter

Acton

et al. 2012

Earth and Planetary Science Letters

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128

156

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a b s t r a c t a r t i c l e i n f oHere we present orbitally-resolved records of terrestrial higher plant leaf wax input to the North Atlantic over the last 3.5 Ma, based on the accumulation of long-chain n-alkanes and n-alkanl-1-ols at IODP Site U1313. These lipids are a major component of dust, even in remote ocean areas, and have a predominantly aeolian origin in distal marine sediments. Our results demonstrate that around 2.7 million years ago (Ma), coinciding with the intensification of the Northern Hemisphere glaciation (NHG), the aeolian input of terrestrial material to the North Atlantic increased drastically. Since then, during every glacial the aeolian input of higher plant material was up to 30 times higher than during interglacials. The close correspondence between aeolian input to the North Atlantic and other dust records indicates a globally uniform response of dust sources to Quaternary climate variability, although the amplitude of variation differs among areas. We argue that the increased aeolian input at Site U1313 during glacials is predominantly related to the episodic appearance of continental ice sheets in North America and the associated strengthening of glaciogenic dust sources. Evolutional spectral analyses of the n-alkane records were therefore used to determine the dominant astronomical forcing in North American ice sheet advances. These results demonstrate that during the early Pleistocene North American ice sheet dynamics responded predominantly to variations in obliquity (41 ka), which argues against previous suggestions of precession-related variations in Northern Hemisphere ice sheets during the early Pleistocene.

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Section: Variations In Aeolian Inputsupporting

confidence: 76%

“…3), continuing the long-term trend that began in the late Pliocene (Naafs et al, 2010). During the Pliocene, SSTs were generally warmer than present, even during some glacials.…”

Section: Sea Surface Temperaturesmentioning

confidence: 88%

Section: Sampling Strategy Site U1313mentioning

confidence: 99%

See 1 more Smart Citation

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Naafs

Hefter

Acton

et al. 2012

Earth and Planetary Science Letters

Self Cite

128

156

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“…(ODP Site 1090; Martínez-Garcia et al, 2011) and 41°N in the North Atlantic (IODP Site U1313; Naafs et al, 2010). These subpolar records diverge after ~3.5 Ma and exhibit opposing trends across the large positive δ18O excursion associated with theM2 glacial advance at 3.3 Ma (Lisiecki and Raymo, 2005).…”

Section: Onset Of Ross Sea Cooling During An Interval Of Global Warmthmentioning

confidence: 99%

“…A) LR04 benthic oxygen isotope stack (Lisiecki and Raymo, 2005) plotted against Piacenzian SST anomaly for subarctic Atlantic IODP Site U1313. Anomaly was calculated by subtracting the Piacenzian (3.6-2.59 Ma) mean from the alkenone-based SST values of Naafs et al (2010). B) Estimated late Pliocene (3.264-3.025 Ma) austral summer (1 December) SST difference from modern, based on the PRISM3 reconstruction.…”

Section: Onset Of Ross Sea Cooling During An Interval Of Global Warmthmentioning

confidence: 99%

Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

Riesselman

Dunbar

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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Palynological evidence for a southward shift of the North Atlantic Current at ~2.6 Ma during the intensification of late Cenozoic Northern Hemisphere glaciation

et al. 2014

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The position of the North Atlantic Current (NAC) during the intensification of NorthernHemisphere glaciation (iNHG) has been evaluated using dinoflagellate cyst assemblages and foraminiferal geochemistry from a~260 kyr interval straddling the base of the Quaternary System from two sites: eastern North Atlantic Deep Sea Drilling Project Site 610 in the path of the present NAC and central North Atlantic Integrated Ocean Drilling Program Site U1313 in the subtropical gyre. Stable isotope and foraminiferal Mg/Ca analyses confirm cooling near the marine isotope stage (MIS) G7-G6 transition (2.74 Ma). However, a continued dominance of the dinoflagellate cyst Operculodinium centrocarpum sensu Wall and Dale (1966) indicates an active NAC in the eastern North Atlantic for a further 140 kyr. At MIS 104 (~2.60 Ma), a profound dinoflagellate cyst assemblage turnover indicates NAC shutdown in the eastern North Atlantic, implying elevated atmospheric pressure over the Arctic and a resulting shift in the westerlies that would have driven the NAC. These findings challenge recent suggestions that there was no significant southward shift of the NAC or the Arctic Front during iNHG, and reveal a fundamental climatic reorganization near the base of the Quaternary.

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Late Pliocene changes in the North Atlantic Current

Cited by 117 publications

References 72 publications

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica

Palynological evidence for a southward shift of the North Atlantic Current at ~2.6 Ma during the intensification of late Cenozoic Northern Hemisphere glaciation

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