umasshydrosystemsresearchgroup The Effects of Variations in El Niño and La Niña Patterns on World Food Markets Patrick Ray 1* , Richard Robertson 2 , Tingju Zhu 2 , Gauthier Pitois 2 , Scott Steinschneider 1 , and Casey M. Brown 1 1 Department of Civil and Environmental Engineering, University of Massachusetts, Amherst 2 International Food Policy Research Institute, Washington, D.C. 16 December 2014