The Dual Pyramid Hypothesis: Giza as an Atmospheric Water Harvesting Array and the Anthropogenic Trigger of North African Desertification

Suggested Submission Abstract The Giza pyramid complex has been interpreted primarily as a funerary monument since systematic Egyptological study began. This paper proposes an alternative functional hypothesis: that the complex operated as a passive atmospheric water harvesting array, and that its operation constituted an unintended anthropogenic trigger for the accelerated desertification of North Africa during the late African Humid Period. Two independently documented but unresolved anomalies motivate the inquiry: the anomalously rapid rate of North African aridification (c. 4,200 BP), which orbital forcing models systematically fail to reproduce; and the continuously replenished, unattributed water body documented in the Giza subterranean chamber system since 1934. We propose that the pyramid array functioned through three concurrent passive mechanisms — microporous limestone adsorption analogous to metal-organic framework water capture, electroosmotic directional transport driven by copper-limestone galvanic coupling, and diurnal thermal cycling — channelling atmospheric moisture into an engineered subsurface reservoir. Simultaneously, the 100-kilometre artificial terrain barrier produced orographic rain shadow effects estimated at 5–8% regional precipitation reduction, sufficient to exceed the bifurcation threshold of a near-critical vegetation-albedo feedback system. Chronological alignment between the construction period, computed chamber saturation, and the 4.2 kiloyear arid event onset falls within standard palaeoclimate dating uncertainty. Five falsifiable predictions are advanced, each addressable through existing empirical methodologies including stable isotope analysis, petrographic examination, and palaeoclimate GCM simulation.