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AGU: Geophysical Research Letters

 

Keywords

  • deforestation
  • drought
  • feedbacks

Index Terms

  • 1622 - Earth system modeling
  • 1632 - Land cover change
  • 1812 - Drought
  • 1843 - Land/atmosphere interactions
  • 3344 - Paleoclimatology

Paper in Press

GEOPHYSICAL RESEARCH LETTERS, doi:10.1029/2012GL052565

Pre-Columbian deforestation as an amplifier of drought in Mesoamerica

Key Points
  • Pre-Columbian deforestation reduces annual precipitation by 5%-15%.
  • This could account for up to 60% of the total drying during the Maya collapse.
  • Future deforestation could contribute to regional climate change.

Authors:

Benjamin I Cook

Kevin John Anchukaitis

Jed Kaplan

Michael Joseph Puma

Maxwell Kelley

Denis Gueyffier

Droughts in pre-Columbian Mesoamerica caused significant societal disruptions during the Late Classic and Post-Classic Periods. While the primary causes of these droughts are still debated, it has been speculated that they may be linked to extensive deforestation associated with high population densities during these intervals. Here we show that pre-Columbian deforestation would have biased the climate in Mesoamerica towards a drier mean state, amplifying drought in the region. In climate model simulations using a pre-Columbian land cover reconstruction, annual precipitation decreases by 5%- 15% throughout southern Mexico and the Yucatan compared to simulations using either natural forest cover or forest regrowth associated with population declines after 1500 C.E. These changes are driven primarily by large reductions (10%-20%) in precipitation during the late summer wet season (August-September). When compared to precipitation changes estimated to have occurred during the Maya collapse, our results suggest that deforestation could account for up to sixty percent of the mean drying during this interval. Many regions previously deforested in the pre-Columbian era are now under dense forest cover, indicating potential future climate impacts should tropical deforestation of these areas accelerate.

Received 1 June 2012; accepted 24 June 2012.

Citation: Cook, B. I., K. J. Anchukaitis, J. Kaplan, M. J. Puma, M. Kelley, and D. Gueyffier (2012), Pre-Columbian deforestation as an amplifier of drought in Mesoamerica, Geophys. Res. Lett., doi:10.1029/2012GL052565, in press.