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Di Long, Bridget R. Scanlon, D. Nelun Fernando, Lei Meng, and Steven M. Quiring

extreme minimum temperature: for example, the western Indian Ocean region ( Vincent et al. 2011 ) and western central Africa, Guinea Conakry, and Zimbabwe ( Aguilar et al. 2009 ). Changes in extreme temperatures are more spatially coherent than changes in extreme precipitation that exhibit strong local variability over the HP, which are also consistent with the findings in the previously mentioned studies. A decreasing trend in CDD at a rate of about −1 day decade −1 over the NHP appears to be

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Kingtse C. Mo, Lindsey N. Long, and Jae-Kyung E. Schemm

Dr. Dennis Lettenmaier and his group from the University of Washington for providing P and soil moisture data. This work was supported by NCPO/CPPA Grants NA09OAR4310189 and H8R1RP3P01. References Barlow , M. , S. Nigam , and E. H. Berbery , 2001 : ENSO, Pacific decadal variability, and U.S. summertime precipitation, drought, and stream flow . J. Climate , 14 , 2105 – 2128 . Burnash , R. J. , R. J. Ferral , and R. A. McGuire , 1973 : A generalized streamflow simulation

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Daniel J. McEvoy, Justin L. Huntington, John T. Abatzoglou, and Laura M. Edwards

1. Introduction Increasing water demands and climate variability in the face of finite water supply are of particular concern in Nevada and eastern California and across the greater southwestern United States. Drought is a complex phenomenon that can have several different meanings; for example, a simple precipitation P deficit is commonly referred to as meteorological drought, while hydrologic and agricultural drought refers primarily to the availability of surface and groundwater and soil

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Sergio M. Vicente-Serrano, Santiago Beguería, Jorge Lorenzo-Lacruz, Jesús Julio Camarero, Juan I. López-Moreno, Cesar Azorin-Molina, Jesús Revuelto, Enrique Morán-Tejeda, and Arturo Sanchez-Lorenzo

adequately quantify the degree of drought hazard exerted on sensitive systems. Many studies have shown strong relationships between the temporal variability of different drought indices and response variables of natural systems such as tree growth (e.g., Orwig and Abrams 1997 ; Copenheaver et al. 2011 ; Pasho et al. 2011 ), river discharge (e.g., Vicente-Serrano and López-Moreno 2005 ; Hannaford et al. 2011 ), groundwater level ( Khan et al. 2008 ; Fiorillo and Guadagno 2010 ), crop yields (e

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