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Paleoclimatic Evidence in Apparent 14C Ages of Saharian Groundwaters

Published online by Cambridge University Press:  18 July 2016

Christian Sonntag ,
Ulf Thorweihe ,
Jochen Rudolph ,
E P Löhnert ,
Christel Junghans ,
K O Münnich ,
Eberhard Klitzsch ,
E M El Shazly  and
F M Swailem
Christian Sonntag
Affiliation:
Institut für Umweltphysik, Universität Heidelberg, West Germany
Ulf Thorweihe
Affiliation:
Geologisches Institut der Technischen Universität Berlin
Jochen Rudolph
Affiliation:
Institut für Umweltphysik, Universität Heidelberg, West Germany
E P Löhnert
Affiliation:
Geology Department, University of Ife, Nigeria
Christel Junghans
Affiliation:
Institut für Umweltphysik, Universität Heidelberg, West Germany
K O Münnich
Affiliation:
Institut für Umweltphysik, Universität Heidelberg, West Germany
Eberhard Klitzsch
Affiliation:
Geologisches Institut der Technischen Universität Berlin
E M El Shazly
Affiliation:
Nuclear Materials Corporation, Cairo, Egypt
F M Swailem
Affiliation:
Middle Eastern Regional Radioisotope Centre, Cairo, Egypt
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Abstract

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Frequency distributions of more than 300 14C groundwater ages from various regions in northern and southern Sahara reflect the alternating sequence of humid and arid periods in the Sahara during the Holocene and late Pleistocene. A broad frequency maximum between 20,000 and 50,000 years bp indicates a long humid period. During this time span, the northern Sahara received rain from the Western Drift, which is concluded from a west-east decrease of deuterium and oxygen 18 of these groundwaters (continental effect). In the time-slice between 14,000 and 20,000 years bp, groundwater formation was significantly lower due to a cool and (semi-)arid period. In the Holocene, the Saharian climate is characterized by a sequence of dry and wet periods.

Type
Soils and Groundwater
Information
Radiocarbon , Volume 22 , Issue 3: Heidelberg , 1980 , pp. 871 - 878
Copyright
Copyright © The American Journal of Science

References

Ambroggi, R P, 1966, Water under the Sahara: Scientific American, v 214, p 21–29.10.1038/scientificamerican0566-21Google Scholar
Bath, A H, Edmunds, W M, Andrews, J N, 1978, Paleoclimatic trends deduced from the hydrochemistry of a Triassic sandstone aquifer, United Kingdom, in Isotope hydrology: Vienna, IAEA, p 545–566.Google Scholar
Castany, G, Marcé, A, Margat, J, Moussu, H, Vuillaume, Y, and Evin, J, 1974, Etude par les isotopes du milieu du régime des eaux souterraines dans les aquifères de grandes dimensions, in Isotope techniques in groundwater hydrology, vol 1: Vienna, IAEA, p 243–257.Google Scholar
Gasse, F, 1980, Late Quaternary diatom record of reference sections from Ethiopia and Djibouti territory, in Sarnthein, M, Seibold, E, Rognon, P, eds, Sahara and surrounding seas, sediments and climatic changes, Internatl symposium, Mainz, 1-4 April 1979, Proc, in Van Zinderen Bakker, S R and Coetzee, J A, eds, Palaeoecology of Africa and the surrounding islands, vol 12: Rotterdam, Balkema, p 333–350.Google Scholar
Gonfiantini, R, Conrad, G, Fontes, J C, Sauzay, G, Payne, B R, 1974, Etude isotopique de la nappe du Continental Intercalaire et de ses relations avec les autres nappes du Sahara, in Isotope techniques in groundwater hydrology, vol 1: Vienna, IAEA, p 227–240.Google Scholar
Mabrook, B and Shafi, Abdel, Sh, M, 1977, Hydrological and environmental isotope studies of Bara Basin, Central Sudan, in Symposium on trace elements in drinking water, agriculture and human life: Cairo, Middle East Radioisotope Centre and Goethe Inst, p 123–149.Google Scholar
Mazor, E, 1972, Paleo-temperatures and other hydrological parameters deduced from noble gases in groundwaters, Jordan Rift Valley, Israel: Geochim et Cosmochim Acta, v 36, p 1321–1336.Google Scholar
Merlivat, L and Jouzel, J, 1979, Global climatic interpretation of the Deuterium-Oxygen-18 relationship for precipitation: Jour Geophys Research, v 84, no. C8, p 5029–5033.Google Scholar
Münnich, K O, Clarke, W B, Fischer, K H, Flothmann, D, Kromer, B, Roether, W, Siegenthaler, U, Top, Z and Weiss, W, 1978, Gas exchange and evaporation studies in a circular wind tunnel, in Favre, A and Hasselmann, K, eds, NATO Conf, ser 5, Air-sea interactions, vol 1: New York, Plenum Press, p 151–166.Google Scholar
Pachur, H J, 1980, The flat areas of Central Sahara in the Early Holocene, in Sarnthein, M, Seibold, E, Rognon, P, eds, Sahara and surrounding seas, sediments and climatic changes, Internatl symposium, Mainz, 1-4 April 1979, Proc, in Van Zinderen Bakker, S R and Coetzee, J A, eds, Palaeoecology of Africa and the surrounding islands, vol 12: Rotterdam, Balkema, p 351–363.Google Scholar
Sonntag, C, Klitzsch, E, Löhnert, E P, El Shazly, E M, Münnich, K O, Junghans, C, Thorweihe, U, Weistroffer, K, and Swailem, F M, 1978, Paleoclimatic information from D and 18O in 14C dated North Saharian groundwaters; groundwater formation in the past, in Isotope Hydrology: Vienna, IAEA, p 569–580.Google Scholar
Sonntag, C, Neureuther, P, Kalinke, C, Münnich, K O, Klitzsch, E, and Weistroffer, K, 1976, Zur Paläoklimatik der Sahara; Kontinentaleffekt im D- und 18O-Gehalt pluvialer Saharawässer: Naturwissenschaften, v 63, no. 10, p 479.Google Scholar
Sonntag, C, Thorweihe, U, Rudolph, J, Löhnert, E P, Junghans, C, Münnich, K O, Klitzsch, E, El Shazly, E M, and Swailem, F M, 1980, Isotopic identification of Saharian groundwaters, groundwater formation in the past, in Sarnthein, M, Seibold, E, and Rognon, P, eds, Sahara and surrounding seas, sediments and climatic changes, Internatl symposium, Mainz, 1-4 April 1979, Proc, in Van Zinderen Bakker, S R and Coetzee, J A, eds, Palaeoecology of Africa and the surrounding islands, vol 12: Rotterdam, Balkema, p 159–171.Google Scholar
Sonntag, C, Thorweihe, U, Rudolph, J, Löhnert, E P, Junghans, C, Münnich, K O, Klitzsch, E, El Shazly, E M, and Swailem, F M, in press, Isotopic identification of Saharian groundwaters, groundwater formation in the past, in Working conf on isotopes in nature, 2d, Leipzig, 5-9 November 1979: Leipzig, Akade Wiss DDR, ZFI-Mitt.Google Scholar