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Relation between century-scale Holocene arid intervals in tropical and temperate zones (1995)

Lamb, H. F. ; Gasse, F. ; Benkaddour, A. ; [et al.]

[s.l.] : Nature Publishing Group

Nature 373 (1995), S. 134-137

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Tigalmamine (32Â° 54' N, 5Â° 21' W, area 6 ha, maximum depth 16m) is the largest of a group of solution lakes in Lower Lias dolomite bedrock, at 1,628 m above sea level in the Middle Atlas of Morocco. The lake (Table 1) is fed by ground water, surface springs, and winter runoff ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/373134a0

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Holocene climatic change in Morocco: a quantitative reconstruction from pollen data (1998)

Cheddadi, R. ; Lamb, H. F. ; Guiot, J. ; [et al.]

Springer

Climate dynamics 14 (1998), S. 883-890

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ISSN: 1432-0894

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract Annual precipitation, July and January temperatures were reconstructed from a continuous Holocene pollen sequence from the Middle Atlas, Morocco, using the best modern analogues method. The reconstructions show a clear difference between the early and late Holocene: from ∼10 ka to ∼6.5 ka the climate was drier and warmer than during the period since 6.5 ka. The average value of annual precipitation was ∼870 mm until 6.5 ka, then rose to ∼940 mm. Between 10 ka and 6.5 ka January and July temperatures were about 4 °C higher than the present. Both temperatures show a marked decrease between 7 ka and 6 ka. After 6.5 ka July and January temperatures fluctuated between 21 and 23 °C, and 2.5 and 5 °C respectively. January temperatures show a period of intermediate values (∼3.5 °C) between 4 ka and 5.5 ka. The reconstructed climate values generally match palaeolimnological data from the same core, which show five intervals of low lake level during the Holocene. They are also consistent with regional-scale COHMAP simulated palaeoclimate that shows contrasting patterns of rainfall variation between the northwesternmost part of Africa and the intertropical band.