Megadrought and Aridity

Megadrought is a term we’ve been hearing a lot of lately, with, as we find out from one of our guests, somewhat varying definitions. The term megadrought is generally used to describe the length of a drought, and not its acute intensity. A related term, aridity, is the degree to which climate lacks effective, life-promoting moisture. Simply put, aridity is permanent, while drought is temporary. But when drought extends multiple decades, as we are currently experiencing, is it actually aridification? We interviewed two experts in drought and aridification, Dr. Connie Woodhouse and Dr. Mike Crimmins, to talk about these different terms, and discuss the changes they have been observing, and hearing about from managers and ranchers in the Southwest.Episode Image credit: U.S. Drought Monitor - West. National Drought Mitigation Center; U.S. Department of Agriculture; National Oceanic and Atmospheric Administration (2022). United States Drought Monitor. University of Nebraska-Lincoln. https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx?West. Accessed 2022-09-06.Links and publications mentioned during the interview:Woodhouse, C. A., & Overpeck, J. T. (1998). 2000 years of drought variability in the central United States. Bulletin of the American Meteorological Society, 79(12), 2693-2714.Gangopadhyay, S., Woodhouse, C.A., McCabe, G.J., Routson, C.C. and Meko, D.M., 2022. Tree rings reveal unmatched 2nd century drought in the Colorado River Basin. Geophysical Research Letters, 49(11), p.e2022GL098781.Climate Assessment for the Southwest website.If you’re enjoying this podcast, please consider rating us and/or leaving us a review on Apple Podcasts, Podcast Addict, or Podchaser Thanks!Follow us on Twitter @RainShinePodNever miss an episode! Sign up to get an email alert whenever a new episode publishesHave a suggestion for a future episode? Please tell us!Come Rain or Shine affiliate links:DOI Southwest CASC: https://www.swcasc.arizona.edu/USDA Southwest Climate Hub: https://www.climatehubs.usda.gov/hubs/southwestSustainable Southwest Beef Project (NIFA Grant #2019-69012-29853): https://southwestbeef.org/