LETTER TO THE EDITOR Comment on “Antiphasing between Rainfall in Africa’s Rift Valley and North America’s Great Basin”

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چکیده

Johnson et al. (1996) presented evidence that Lake Victoria as dry before 12,800 C years ago. Broecker et al. (1998) oncluded from water-balance calculations that the precipitaion rate when the lake was dry must have been smaller than it s now by a factor of at least four. The apparent magnitude of he change in precipitation and its near simultaneity with other hanges elsewhere on the globe were advanced in support of he hypothesis that the global climate system underwent an brupt change at the time of the Bölling–Alleröd interstade, ather than a gradual, linear response to changes in orbital orcing. Broecker et al. acknowledged clearly some shortcomings of heir quantitative analysis of the relation between lake area and recipitation. Specifically, they noted that their analysis exluded two positive feedbacks of climatic drying and one ossible accompanying forcing function that might oppose rying:

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تاریخ انتشار 1998