Orbital forcing of dust supply to the North Canary Basin over the last 250kyr

Moreno, Ana; Targarona, Jordi; Henderiks, Jorijntje; Canals, Miquel; Freudenthal, Tim; Meggers, Helge

doi:10.1016/s0277-3791(00)00184-0

Cited by 89 publications

(67 citation statements)

References 64 publications

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“…Such a relationship has been observed in the Mediterranean paleoclimate record of the past 50 kyr (Allen et al, 1999;Moreno et al, 2001;Combourieu-Nebout et al, 2002;Sanchez-Goni et al, 2002;Moreno et al, 2004). These studies attribute dry phases with increased dust transport from the Sahara to the western and central Mediterranean to a strengthening and a northward displacement of the NorthWesterlies during stadial intervals similar to present day high NAO (North Atlantic Oscillation) index years.…”

mentioning

confidence: 65%

Late Pliocene climate variability on Milankovitch to millennial time scales: A high-resolution study of MIS100 from the Mediterranean

Becker

Lourens

Hilgen

et al. 2005

Palaeogeography, Palaeoclimatology, Palaeoecology

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Astronomically tuned high-resolution climatic proxy records across marine oxygen isotope stage 100 (MIS100) from the Italian Monte San Nicola section and ODP Leg 160 Hole 967A are presented. These records reveal a complex pattern of climate fluctuations on both Milankovitch and sub-Milankovitch timescales that oppose or reinforce one another. Planktonic and benthic foraminiferal d18 O records of San Nicola depict distinct stadial and interstadial phases superimposed on the saw-tooth pattern of this glacial stage. The duration of the stadial-interstadial alterations closely resembles that of the Late Pleistocene Bond cycles. In addition, both isotopic and foraminiferal records of San Nicola reflect rapid changes on timescales comparable to that of the Dansgard-Oeschger (D-O) cycles of the Late Pleistocene. During stadial intervals winter surface cooling and deep convection in the Mediterranean appeared to be more intense, probably as a consequence of very cold winds entering the Mediterranean from the Atlantic or the European continent.The high-frequency climate variability is less clear at Site 967, indicating that the eastern Mediterranean was probably less sensitive to surface water cooling and the influence of the Atlantic climate system. Concomitant changes in the colour reflectance of ODP Site 967 and the calcium carbonate record of San Nicola probably indicate that part of the high-frequency climate variability (3-5 kyr) in the eastern Mediterranean is related to changes in Saharan dust supply. Evidently, enhanced dust deposition in the Mediterranean correlates with the cold intervals of the millennial-scale D-O oscillations suggesting that the Atlantic pressure system may have played a critical role in varying the wind strength and/or aridification of northern Africa. D

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mentioning

confidence: 65%

Late Pliocene climate variability on Milankovitch to millennial time scales: A high-resolution study of MIS100 from the Mediterranean

Becker

Lourens

Hilgen

et al. 2005

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…A considerable number of 14 C ages and other geochronological data have been collected from aeolianite-paleosol sequences on the nearby island of Fuerteventura and in Morocco (PetitMaire et al, 1986;Damnati et al, 1996;Rognon and Coudé-Gaussen, 1996), in the Sahara (Reichelt et al, 1992;Swezey, 2001) and in the North Canary Basin (Moreno et al, 2001). The well-established aridification of the Sahara after the lower to middle Holocene humid phase is reflected by the strong pulse of desert loess accumulation on Lanzarote since ca 5 ka, whereas the preceding more humid period is witnessed by the formation of a cambic soil between ca 10 and 5 ka.…”

Section: Discussionmentioning

confidence: 99%

“…The goal of our pilot project was to set up a complete stratigraphy of these sequences and to test luminescence (IRSL) dating ofthe fine-grained fraction originating mostly from Saharan dust. Our encouraging first results suggest a rough chronology for the past ca 200 ka and can be compared to data from neighbouring areas such as Fuerteventura island (e.g., Petit-Maire et al, 1986;Rognon and Coudé-Gaussen, 1987;Rognon et al, 1989Rognon et al, , 1996 and the North Canary Basin (Moreno et al, 2001). Furthermore, we tried to find (geo-) archaeological evidence for the onset of human occupation (cf.…”

Section: Introductionmentioning

confidence: 99%

Geoarchaeological and chronometrical evidence of early human occupation on Lanzarote (Canary Islands)

Zöller

Suchodoletz

Küster

2003

Quaternary Science Reviews

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Two desert loess-paleosol sequences in sediment traps were investigated using (pedo-) stratigraphy, sedimentology, soil mineralogy and IRSL dating. So far we cannot recognise significant IRSL ageunderestimates from the polymineral fine-grain fraction of our samples. We establish a first palaeoclimatic sequence spanning the past ca 200 ka which can be compared to data from other Canary Islands and surrounding areas, including terrestrial and deep sea records. More humid phases on Lanzarote are apparently triggered by Milankovich forcing, but the climate remained semi-arid to arid all over the past 200 ka. The onset of human occupation of the island during a slightly moister period is bracketed between 5 and 10 ka, based on the occurrence of archaeosediments containing bones of ovicaprid. This is the first proof of much earlier occupation than witnessed so far from archaeological records. The early subsidiary economy had a strong impact on soil stability and landscape shaping of the island.

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“…Ceci donne un caractère particulier à cette région qui se distinguerait du reste du Sahara ( Figure 1). Figure 1 : Région côtière étudiée influencée par le Courant des Canaries (Canary Current -flèche noire), les upwelling, les alizés (trade winds), ainsi que les vents sahariens (tiré de Moreno et al, 2001) De plus, elle est à la limite des zones saharienne et méditerranéenne marocaines (White, 1983). Sa position à la frontière d'une zone phytobioclimatique la rend témoin de toute fluctuation de cette limite.…”

Section: De Nombreuses éTudes Paléoclimatiques Et Paléohydrologiques unclassified

“…Nord (Moreno et al, 2001). Les enregistrements isotopiques de l'oxygène-18 y sont comparés avec la courbe SPECMAP (Martinson et ai, 1987).…”

Section: Interprétation Paléoclimatiqueunclassified

Application des méthodes de datation par luminescence optique à l'évolution des environnements désertiques :

Bouab¹

2001

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Orbital forcing of dust supply to the North Canary Basin over the last 250kyr

Cited by 89 publications

References 64 publications

Late Pliocene climate variability on Milankovitch to millennial time scales: A high-resolution study of MIS100 from the Mediterranean

Late Pliocene climate variability on Milankovitch to millennial time scales: A high-resolution study of MIS100 from the Mediterranean

Geoarchaeological and chronometrical evidence of early human occupation on Lanzarote (Canary Islands)

Application des méthodes de datation par luminescence optique à l'évolution des environnements désertiques :

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