New Insights into Seasonal to Interannual Water Cycle Variability Across the Great Plains

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1 New Insights into Seasonal to Interannual Water Cycle Variability Across the Great Plains Jeffrey B. Basara Associate Professor, School of Meteorology Associate Professor, School of Civil Engineering and Environmental Science Executive Associate Director, Hydrology and Water Security Program University of Oklahoma Oklahoma Governor s Water Conference and Research Symposium Midwest City, OK 5 December 2018

2 Acknowledgments Co-authors and Collaborators: Paul Flanagan*, Jordan Christian*, Ryann Wakefield*, Hayden Mahan*, Jean Liu*, Skylar Williams**, Katy Christian**, Taylor McCorkle**, Tim Pfieffer**, Jason Furtado, Elinor Martin, Cameron Homeyer, Mike Richman, Renee McPherson, Xiangming Xiao, Rajen Bajgain, Yuting Zhou, Jie Wang, Zhenhua Zou, Xiaocui Wu, Russell Doughty, Pradeep Wagle, Jean Steiner, Prassana Gowda, Dan Devlin, Amber Campbell, Jason Otkin, Eric Hunt Sponsors: The Agriculture and Food Research Initiative Competitive Grant no from the USDA National Institute of Food and Agriculture. USDA National Institute of Food and Agriculture (NIFA) Grant no NOAA Climate Program Office s Sectoral Applications Research Program (SARP) grant NA130AR National Science Foundation grant ICER USDA Southern Plains Climate Hub Cooperative Agreement

3 CHEWe Research Group: Interdisciplinary Research Focus Climate Hydrology Weather Ecosystems

4 Orthogonal Gradients of Temperature and Precipitation Dynamic Climate

5 Historical Droughts in Oklahoma Basara, J. B., J. N. Maybourn, C. M. Peirano, J. E. Tate, P. J. Brown, J. D. Hoey, and B. R. Smith, 2013: Drought and associated impacts in the Great Plains of the United States A review. International Journal of Geosciences, 4,

6 Dynamic Climate

7 Warrick (1980)

8 January 2011 April 2011 July 2011 October 2011 January 2012 April 2012 July 2012 October 2012 January 2013 April 2013 July 2013 October 2013 January 2014 April 2014 July 2014 October 2014

9 Historical Droughts (and Pluvials) in Oklahoma

10

11 Dipole Transitions Christian J., K. Christian, and J. B. Basara, 2015: Drought and Pluvial Dipole Events within the Great Plains of the United States. J. Appl. Meteor. Climatol., 54, A pair of equal and opposite electric charges or magnetic poles of opposite sign separated especially by a small distance. An abrupt year-to-year transition from drought to pluvial (flood). Able to erase multi-year droughts in a matter of months. Droughts of Record Probability of a significant drought year followed by a pluvial year: - SGP: 25% - NGP: 25% - HP: 16%

12 October 2014 May 2015

13 Southern Great Plains Hydroclimate: Importance of water resources Flanagan, P. X., J. B. Basara, and X. Xiao, 2017: Long-term analysis of the asynchronicity between temperature and precipitation maxima in the United States Great Plains. International Journal of Climatology, 37, Concept from Flanagan et al Illston et al. 2004

14 Flanagan, P. X., J. B. Basara, and X. Xiao, 2017: Long-term analysis of the asynchronicity between temperature and precipitation maxima in the United States Great Plains. International Journal of Climatology, 37, Conceptual Diagram Temperature/Precipitation Relationship in the SGP Precipitation Temperature January May July December The overall variability is increasing.

15 Trends in Precipitation Variability in the GP Weaver et al. (2016) Flanagan et al. (2018)

16 How does excessive rainfall occur? 2. SST anomalies cause a strengthening of the Aleutian Low H 2. SST s cause mid-level Ridge to form over the Pacific 6. More 4. Waves precipitation travel along jet stream, cause over height the anomalies Southern 5. Southerly flow Great across Plains! southwestern US. enhanced, more L moisture! 3. Height pattern accelerates westerly flow; shifts jet stream to the south! 1. Warm tropical SST anomalies Flanagan, P. X., J. B. Basara, J. C. Furtado, E. R. Martin, X. Xiao, 2018: Role of Pacific Sea Surface Temperatures in United States Great Plains Pluvial Years. Journal of Climate, In Review.

17 Drought Versus Pluvial Land-Atmosphere Coupling Dry Coupling Wet Coupling Basara, J. B., and J. I. Christian, 2018: Seasonal and interannual variability of land atmosphere coupling across the Southern Great Plains of North America using the North American regional reanalysis. International Journal of Climatology, 38, doi: /joc.5223.

18 Take-Away Message The Great Plains domain is a region defined by dynamic weather/climate variability includes subseasonal to seasonal extremes. Precipitation variability is increasing, especially the temporal aspect Process variability is increasing. The results of the increase in precipitation variability is that: Increased frequency in the oscillations between drought/pluvial periods, Impacts the asnychonicity between the annual peaks in temperature and precipitation, Along with local coupling, may be impacting the generation of flash drought conditions, Driven by to local to global processes. Impacts span many local socioeconomic sectors especially agriculture. Much work to be done Additional Drivers? Predicability? Projections?

19 Questions? Climate Hydrology Weather Ecosystems CHEWe Research Group - Interdisciplinary Research Focus

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