Neue14C-daten aus Marokko und Spanien und ihre aussagen for die relief- und bodenentwicklung im holozän und jungpleistozän

Rohdenburg, H.

doi:10.1016/0341-8162(77)90023-6

Cited by 20 publications

(7 citation statements)

References 7 publications

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“…Although palaeohumidity and precipitation are generally better recorded in terrestrial than in marine archives, to our knowledge, no terrestrial study from the Northwest African region has yet presented continuous records of precipitation regimes or landscape geomorphic reactions to precipitation changes. Instead, most terrestrial archives only record events limited to the Holocene or latest Pleistocene (e.g., Rohdenburg, 1977;Gasse et al, 1987;Cheddadi et al, 1998;Lancaster et al, 2002). The next archives that continuously cover at least the last glacial cycle are only found in the northern Mediterranean area (e.g., Pons and Reille, 1988;Allen et al, 1999;Narcisi, 2001).…”

Section: Introductionmentioning

confidence: 99%

Soil moisture fluctuations recorded in Saharan dust deposits on Lanzarote (Canary Islands) over the last 180 ka

Suchodoletz

Oberhänsli

Hambach

et al. 2010

Quaternary Science Reviews

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Aeolian sediments trapped in volcanically dammed valleys on Lanzarote, Canary Islands, were investigated in order to reveal environmental changes over the last 180 ka. Clay content and frequency dependent magnetic susceptibility were used as proxies for pedogenesis and palaeo-soil moisture. During the last 180 ka, these proxies showed a general pattern of enhanced soil moisture during glacials and stadials and more arid conditions during interglacials and interstadials. Comparisons of these results with proxies from regional palaeoclimate studies identified a positive correlation with proxies of trade wind strength off northwest Africa and inverse correlations with both sea surface temperatures in the northeast Atlantic and the extent of Mediterranean vegetation. Possible causes for the observed pattern include a glacial enhancement of precipitation from westerly cyclones, a change in relative humidity due to fluctuating air temperatures and an occasional influence of the African summer monsoon. Although it is not yet possible to clearly differentiate among these factors, it is clear that the first two factors must have been primarily dominant. These results represent the first quasicontinuous terrestrial data testifying to environmental changes in the northwest African coastal area for the last 180 ka and complement the abundant data derived from marine cores of the region. High latitude dynamics had a major influence in this area and were intermediated by North Atlantic sea surface temperatures. A possible negative correlation can also be observed with the orbital obliquity cycle with a 10 ka time lag, which is similar to the lag recorded from North Atlantic sea surface temperatures.

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Section: Introductionmentioning

confidence: 99%

Soil moisture fluctuations recorded in Saharan dust deposits on Lanzarote (Canary Islands) over the last 180 ka

Suchodoletz

Oberhänsli

Hambach

et al. 2010

Quaternary Science Reviews

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“…Fig. 2 in Rohdenburg, 1977), or in North America where the difference of rain types could explain a sedimentological change but also some vegetational modifications (cf. Martin, 1963;Byrne et al, 1979;Watts, 1979Watts, , 1980R.…”

Section: Discussionmentioning

confidence: 99%

Dust, Clouds, Rain Types, and Climatic Variations in Tropical North Africa

Maley

1982

Quat. res.

136

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Dust and processes of raindrop formation in the clouds play a very important role in the climatic evolution of tropical north Africa. Sedimentologic, stratigraphic, pedologic, geomorphologic, and palynologic data converge to show that a major environmental change occurred in tropical Africa about 7000 yr B.P. In the Sudanian and Sudano–Guinean zones (wet tropical zone), from 15,000 to 7000 yr B.P., rivers deposited mostly clay, while from 7000 to 4000 yr B.P. they deposited mostly sand. During the first period, pedogenesis was vertisolic (montmorillonite dominant), associated with pollen belonging mostly to vegetation typical of hydromorphic soils, while during the second period pedogenesis was of ferruginous type (kaolinite dominant) with pollen belonging mostly to vegetation typical of well-drained soils. The great change near 7000 yr B.P. is linked chiefly to a major hydrological change that appears related to a change in the size of raindrops: from fine rains associated with considerable atmospheric dust (raindrop diameter essentially less than 2 mm) to the second period associated with thunderstorm rains (raindrop diameter mostly greater than 2 mm). The size of raindrops is related particularly to cloud thickness and dust concentration in the troposphere. Thunderstorm activity is influenced also by fluctuations of the atmospheric electricity, modulated by the sun.

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“…A low sandy terrace was here formerly described as "Mellahian" by Ambroggi and Gigout (1953); it was in fact a near-shore dune capped by several kjökkenmödding (Weisrock, 1980), that had today disappeared because of strong climatic and anthropogenic erosion. Only notches cut in the calcarenitic low cliffs and gravelly low fluvial terraces can be found in the estuary (Rohdenburg, 1977;Weisrock,1980).…”

Section: -Ums and Psl Between Imsouane And Agadir: Geomorphology And mentioning

confidence: 99%

Late-middle Pleistocene, late Pleistocene and Holocene palaeo-sea-level records at Agadir and the Atlantic Atlas coastal reach, Morocco: an updated overview

Weisrock¹

2012

quaternaire

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Out of the Late Holocene sea-level highstand at ca. 2.7 ka, seven Late Pleistocene and Late-Middle Pleistocene palaeo-sealevels (PSL) are today recorded along the coast of the Atlantic Atlas of Morocco: 1) as near-shore dunes (NSD) deposits, records of two MIS 2 and MIS 3 PSL near 0 m a.s.l. or just below, at 28 and ca. 40 ka; 2) records of three MIS 5a, 5c and 5e PSL between zero and + 8 m a.s.l.; 3) records of two MIS 7 and MIS 9 PSL above + 10 m a.s.l. and near + 20 m a.s.l.. All datable records are placed in their morpho-lithostratigraphic units (UMS) and discussed with regard to their location, palaeo-environmental and tectonic implications.

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Neue14C-daten aus Marokko und Spanien und ihre aussagen for die relief- und bodenentwicklung im holozän und jungpleistozän

Cited by 20 publications

References 7 publications

Soil moisture fluctuations recorded in Saharan dust deposits on Lanzarote (Canary Islands) over the last 180 ka

Soil moisture fluctuations recorded in Saharan dust deposits on Lanzarote (Canary Islands) over the last 180 ka

Dust, Clouds, Rain Types, and Climatic Variations in Tropical North Africa

Late-middle Pleistocene, late Pleistocene and Holocene palaeo-sea-level records at Agadir and the Atlantic Atlas coastal reach, Morocco: an updated overview

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