(Article of periodic en Anglais - 1980)

Document title

Estimates of past climate at paleolake Chad, North Africa, based on a hydrological and energy-balance model

Authors(s) and Affiliation(s)



Two versions of the model are developed. The first version is one in which precipitation and lake area are linearly related. This version requires specification first of the area, net radiation, and Bowen ratio of the lake and second of the paleovegetation, net radiation, and Bowen ratio of the surrounding basin. In the second version of the model the relationship between precipitation and lake area is nonlinear because the run off ratio and Bowen ratio of the basin are made functions of precipitation. As the lake increases in area in response to increased precipitation, this version of the model allows for further increases in run off (from the basin into the lake) as the vegetation changes from steppe to savanna and swamp. This nonlinear process may provide a partial explanation for the expansive paleolakes of the early Holocene. The results derived from both models are in good agreement with previously derived estimates of precipitation for North Africa during the early Holocene.


Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1980, vol. 14, no2 [pp. 210-223]

Bibliographic references : 31 réf.



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