Investigation the 2006 Drought and 2007 Flood Extreme Events at the US SGP using an integrative analysis of observations Xiquan Dong, Baike Xi, Aaron.

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Investigation the 2006 Drought and 2007 Flood Extreme Events at the US SGP using an integrative analysis of observations Xiquan Dong, Baike Xi, Aaron Kennedy, and Zhe Feng University of North Dakota Jared Entin, Paul Houser, Bob Schiffer, Bill Rossow, Bill Olson, Tristan L’Ecuyer, Tim Liu, Kuo-lin Hsu, and Bing Lin

Motivation: Objective: Hydrological years 2006 (HY06, 10/2005-09/2006) and 2007 (HY07, 10/2006-09/2007) are defined as "two golden years" in this study. 1) There are no examples of two highly contrasting extremes occurred within two consecutive years. 2) No such a comprehensive dataset available concerning the droughts and floods in the SGP relative to other periods in history. To investigate these two golden years, we have collocated ARM ground-based, WSR-88D radar, Oklahoma Mesonet, and GPCP and TRMM satellite observations, as well as NCEP reanalysis over the SGP . Objective: To understand the mechanisms responsible for water and energy extremes (drought and flood) in the U.S. SGP during 2006-2007, including their relationships with continental and global scale processes, and to assess their predictability on multiple space and time scales.

Scientific questions to address 1. Are HY06 and HY07 significant drought and flood? If yes, what are their severities in spatial and temporal variability? 2. What are the annual cycles of observed cloud-radiation-precipitation in HY06 and HY07? 3. To what extent do large-scale dynamics play a role in controlling the SGP extreme events? 4. How do the SGP extreme events link with the tropical east Pacific SST and precipitation anomalies?