See more from this Division: Overarching Sessions
See more from this Session: Pardee Keynote Symposia: Human Influences on the Stratigraphic Record
Abstract:
CLIMATE: The extreme 1930s drought may have resulted from a synchronous combination of decadal-scale Atlantic and Pacific temperature cycles and a breakdown of the ENSO. However, other modern droughts of the same relative intensity did not result in comparable amounts of wind erosion. Increased intensity of lee cyclones may have caused more persistent and stronger winds during this drought.
SOIL MANAGEMENT: Dust mulchingreducing evaporation of soil moisture by keeping a layer of fine dust on the soil surfacemay have been effective in water conservation, but greatly increased soil wind erodibility.
ECONOMIC AND DEMOGRAPHIC FACTORS: In the relatively wet 1920s, much marginal land was converted to agriculture due to high crop prices. Investment in newly-developed mechanized farm equipment also encouraged expanded cultivation while also increasing farmers' debt. When drought killed crops, farmers lacked funds for land management. Still, previous and subsequent economic recessions, crop failures, and changes in farming practices in the Great Plains were not accompanied by Dust Bowl conditions.
None of these factors alone can clearly be said to be the cause of the Dust Bowl; this catastrophe likely was the result of a synergy between human and natural factors. We must learn lessons from the 1930s Dust Bowl to avert future potential disasters associated with climatic and technological changes to Great Plains agriculture.
See more from this Division: Overarching Sessions
See more from this Session: Pardee Keynote Symposia: Human Influences on the Stratigraphic Record